• 专利附录
  • 专利说明
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    • 专利摘要:
    Disclosed is a method for producing a ceramic porous body comprising pores having uniform dimensions by recycling solid waste. 20 to 60 parts by weight of the first powder of the solid waste having non-plasticity and 20 to 40 parts by weight of the second powder having the plasticity are mixed to form a mixture, and then 20 to 40 parts by weight of water is added to the mixture to form a slurry. 0.1 to 10 parts by weight of the peptizing agent is added to the slurry to form a dispersed slurry, 0.01 to 2 parts by weight of the flocculant is added to the dispersed slurry to form an aggregate, and then a molded body is formed by self-gelling of the aggregate. It is possible to produce a ceramic porous body including a plurality of pores having a uniform particle size distribution that can be utilized as a lightweight aggregate or other building and civil engineering material, and the characteristics of the molded or sintered body manufactured from such slurry by controlling the fine structure of the slurry And the size of the pores can be easily adjusted. In addition, since a large amount of waste gypsum generated in a desulfurization process, phosphoric acid, hydrofluoric acid, boron, or titanium manufacturing process can be recycled as a coagulant, the ceramic product can be manufactured, thereby contributing to environmental problems and significantly lowering the manufacturing cost of the ceramic product. .
    公开号:KR20040062784A
    申请号:KR1020030000309
    申请日:2003-01-03
    公开日:2004-07-09
    发明作者:김유택；이기강；김영진；강승구；김정환
    申请人:경기대학교；
    IPC主号:
    专利说明:

    Method for manufacturing porous ceramic body by recycling waste material having solid phase
    [5] The present invention relates to a method for producing a ceramic porous body in which a solid waste is recycled, and more particularly, by uniformly combining solid waste composed of plastic and non-plasticized powders, and adding an appropriate flocculant and a peptizing agent, the interior of the ceramic porous body is uniform. The present invention relates to a method for producing a ceramic porous body that recycles solid waste that can form pores.
    [6] Generally, as a method of molding a ceramic product, methods such as injection molding, tape casting, and plastic extrusion are known. In conventional molding methods of ceramic products, organic solvents have been used to facilitate the shaping and manipulation of the fine powder dispersed with the organic binder and the plasticizer. Accordingly, a separate organic solvent removal process is required, and during such organic solvent removal process, there is a high possibility that the ceramic product may contract and warp unlike a desired shape. In addition, the mechanical properties of the ceramic product may be degraded due to impurities remaining even after performing the organic solvent removal process. Therefore, considering the environmental and economic aspects of the ceramic product manufacturing process based on the characteristics of the ceramic product, a new molding method without using an organic solvent or a polymer additive is required.
    [7] Generally, powder processing of ceramic compacts involves the steps of preparing powders, preparing powders (slurry) for molding, shaping to the required shape and removing pores, densifying and microstructure for optimum properties. Promote the steps. In each step of the powder process described above, the non-uniformity of the ceramic shaped body may be due to the production of the powder itself and the powder (slurry), or may occur in the densification and filling step. In addition, coagulants comprising organic and inorganic substances act as major heterogeneous to the powder. Stress is concentrated in each heterogeneous material, so that a potential flow occurs, which acts as a cause of premature cracking, which in turn causes insulation and mechanical defects.
    [8] In order to improve the method of ceramic products, the behavior depends on the interaction between the particles, so it is important to understand the structure of the slip due to the interaction between the particles in the slurry, so it is suspended in the liquid medium. Consideration should be given to the interaction characteristics between the ceramic powder particles present.
    [9] Young et al. [J. Am. Ceram. Soc. 74 (3) 612p to 618p (1991), through a study on the gel-casting method of alumina (Al 2 O 3 ) powder to disperse the slurry using an aqueous solution containing a polymer dispersant, Organic monomolecules were added to the dispersed slurry, and a catalyst was used to form macromolecules of macromolecules to fix the particles, and to raise the temperature of the slurry to form the polymer using gelation. However, the method starts the gelation after a certain time (idle time) after molding, in particular, the drying process of the molded body and the removal process of the binder is required, the process time is prolonged, causing economic problems. Can be.
    [10] Graule et al. [Ceramic Transaction, Vol 51, 457p-467p (1994)] adjust the hydrogen ionization index (pH) of the ceramic suspensions dispersed with acids or bases and organic dispersants to the isoelectric point (IEP), or directly convert organic salts. A direct coagulation casting (DCC) method has been proposed to agglomerate by adding to a suspension to reduce the thickness of the electrical double layer. However, the method has a problem in that the amount of organic salts to be added is large, and the temperature of the slurry must be adjusted since the aggregation rate varies depending on the temperature of the slurry, and an idle time is required.
    [11] According to U. S. Patent No. 5,188, 780 to Lange et al., The pH of the suspension is adjusted to disperse, aggregate and redisperse, which is then molded by pressure filtration and centrifugation to produce a ceramic molded body. The method is advantageous for the molding of the structural material because it has a nearly constant microstructure of the molded article regardless of the content of the solid. However, according to the above method, a compact molded article can be obtained, but it is not suitable for producing a porous molded article, and the process up to producing the molded article has a complicated disadvantage.
    [12] As a result, none of the new molding methods described above solves the problem of using an organic solvent.
    [13] One object of the present invention is to provide a method for producing a ceramic porous body capable of gelling by dispersing and agglomerating slurry and self-gellation by poly-silicon hydroxo precipitates (PSHP).
    [14] Another object of the present invention is to provide a method for producing a ceramic porous body having a uniform pore structure by gelling molding.
    [15] It is still another object of the present invention to provide a method for producing a ceramic porous body capable of minimizing disproportionation and uncontrolled phase distribution in the ceramic porous body.
    [1] 1 is a schematic diagram showing three types of network structure between conventional particles.
    [2] Figure 2 is a graph showing the viscosity change of the slurry according to the addition amount of the peptizing agent to the slurry containing coal ash and clay according to the present invention.
    [3] Figure 3 is a graph measuring the apparent specific gravity of the molded body and sintered body including the coal ash and clay according to the present invention.
    [4] Figure 4 is a graph showing the pore size distribution of the molded body and the sintered body according to the present invention.
    [16] In order to achieve the above object of the present invention, according to the present invention, the step of forming a mixture by mixing 20 to 60 parts by weight of the first powder of the non-plastic solid waste and 20 to 40 parts by weight of the second powder having a plasticity ; Adding 20 to 40 parts by weight of water to the mixture to form a slurry; Adding 0.1 to 10 parts by weight of a peptizing agent to the slurry to form a dispersed slurry; Adding 0.01 to 2 parts by weight of a flocculant to the dispersed slurry to form agglomerates; Forming a compact by self-gelling of the aggregate; And it provides a method for producing a ceramic porous body having a uniform pore structure comprising the step of sintering the molded body.
    [17] In this case, the solid waste uses any one or more selected from the group consisting of coal ash, lime and incineration ash, and the second powder uses any one or more selected from the group consisting of clay, kaolin, pottery and mica minerals. The peptizing agent uses any one or more selected from the group consisting of Na 2 SiO 3 , Na 4 P 2 O 7 and Na 2 CO 3 .
    [18] Preferably, the flocculant comprises waste gypsum containing CaSO 4 .
    [19] The forming of the molded body may further include naturally drying the molded body for 24 to 48 hours and drying the molded body at a temperature of 50 to 150 ° C. for 20 to 30 hours in a drying furnace. The forming of the sintered compact may further include inserting the molded body into an electric furnace and sintering at a temperature of 1100 to 1200 ° C. for 1 to 3 hours, and cooling the sintered compact in an electric furnace.
    [20] According to the present invention, it is possible to manufacture a ceramic porous body including a plurality of pores having a uniform particle size distribution. Such a porous ceramic body can be fully utilized as lightweight aggregate or other building and civil engineering materials.
    [21] In addition, according to the present invention, by adjusting the fine structure of the slurry, it is possible to easily control the characteristics and the size of the pores of the molded or sintered body produced from such a slurry.
    [22] Furthermore, according to the present invention, since the ceramic porous body is manufactured by inducing peptizing and agglomeration of the slurry using a peptizing agent and a coagulant made of inorganic matter, not an organic additive as in the conventional case, a separate organic matter removing process is not required. The simplicity and economy of the process can be achieved while producing environmentally friendly ceramic products.
    [23] In particular, according to the present invention, since waste gypsum generated in a desulfurization process, phosphoric acid, hydrofluoric acid, boron, or titanium manufacturing process can be recycled as a coagulant to produce a ceramic product, it contributes to environmental problems and at the same time produces a ceramic product. Can be significantly lowered.
    [24] In the present invention, by adsorbing a peptizing agent on the surface of highly charged ceramic particles in an aqueous medium, the surface energy of the ceramic particles is controlled to be low to uniformly disperse the ceramic particles. To this, a flocculant is added to form ceramic particles in the dispersed slurry into small aggregates, and the gelation of these aggregates is used to form a porous new network structure.
    [25] Therefore, when molding the desired article, there is no need for a separate molding method. In this new network structure, no settling of particles in the slurry has ever occurred in the aggregated structure. Therefore, there is no great difficulty in producing a complicated shape.
    [26] In general, the weak attraction between ceramic particles is generated by the combination of van der Waals attraction and electrostatic repulsion at a certain distance by DLVO theory with a very short range of hydration repulsion of about 5 nm or less. do. In this short range, hydration repulsion blocks the attraction of particles. Thus, under moderate conditions, this force has a higher packing density when the particles are easily slipped and solidified into other particles, when the dried powder or particles form a mesh in contact. Hydration repulsion is a repulsive force acting only when the distance between the particle surfaces is very short (about 5 nm or less), in which case van der Waals attraction becomes increasingly strong (see Ceramic Transaction, Vol. 22, 185p to 201p (1991)). .
    [27] 1 schematically shows three types of mesh structures between conventional particles, where (a) represents the coagulation structure (contact mesh), (b) represents the dispersion structure (non-contact mesh), (c) shows the cohesive structure (non-contact mesh).
    [28] According to the present invention, in order to produce a ceramic porous body, a second plastic having a plasticity made of clay, kaolin, pottery and mica minerals in the first powder having a non-plasticity made of solid waste such as fly ash, stone powder or incineration ash The slurry which mixed powder suitably is used.
    [29] Since the coal ash and clay particles of the first and second powders have a hydrophobic surface, the particles are initially strongly coagulated in the slurry according to the DLVO theory, and a mesh is formed between the coagulated particles, causing the particles to settle. When a peptizing agent such as waste gypsum is added to the slurry thus coagulated, the slurry has a dispersed particle structure. In addition, the addition of a flocculant to the dispersed slurry changes the dispersed particle structure into a particle structure in which attractive force is generated again. However, the grain structure created by the new interparticle attraction is not a cohesive grain structure, and unlike the mesh structure of the initially coagulated particles, the grain structure is easily rearranged by weak stress. .
    [30] Coagulants used in the present invention include inorganic salts containing trivalent, divalent, or monovalent cations, and the addition of coagulants having this composition reduces the electrostatic repulsion by reducing the electrical double layer in the sludge. In other words, the mesh structure of the dispersed particles is converted into a mesh structure in which attraction is generated by continuous van der Waals attraction.
    [31] In addition, the first minimum of the potential wells anticipated in the DLVO theory to produce a slurry of agglomerated structure is induced to a second minimum to form agglomerates with no attractive force. However, the particles in these aggregates do not have strong touching between the particles, and as shown in FIG. 1C, the mesh structure of such particles is called a coagulated network (Ceramic). Transaction, Vol. 22, 185p-201p (1991)).
    [32] According to the present invention, the slurry is dispersed by adding a peptizing agent containing waste gypsum, and a flocculant is added to the slurry in which the particles are dispersed to form a cohesive network structure. A slurry having a structure is prepared. In other words, after controlling the electrostatic repulsive force by using a peptizing agent, by forming a mesh of particles by controlling the attraction force by using a flocculant, using a gelation of the slurry to prepare a porous slurry with a constant pore size distribution. That is, if the slurry is dispersed by maximizing all the electrostatic repulsive potentials and then placed at the second minimum value of the potential wells using hydration repulsion and van der Waals attraction (see US Pat. No. 5,188,780), It is a non-touching network but weaker than the flocculated network structure, so it can be easily redistributed by stress.
    [33] The principles of various kinds of organic and inorganic salts can be applied to enhance the coagulated particle network due to the hydration repulsion of charged ceramic particles. However, in the case of applying organic salts, an additional process for removing organic matter is inadequate in terms of simplifying the process, and depending on the composition of the fine ceramic particles, in some cases, a special type of salt is likely to react with the ceramic particles. It would be inappropriate. For example, inorganic salts such as NaCl or NH 4 Cl and the like are suitable for use with most ceramic powders.
    [34] According to the present invention, it is possible to produce a slurry in which a flocculant forms a network structure of particles having a weak attraction force, and does not settle due to the gelation of the network structure. First, alumina (Al 2 O 3 ) and silica (SiO 2 ) are included in about 10 to 70% by weight of at least one non-plastic first powder composed of solid waste containing aluminosilicate as a main component such as coal ash, lime powder or incineration ash. A slurry having a composition of about 30 to 90 weight percent of a plastic second powder composed of clay, kaolin, pottery or mica minerals is prepared.
    [35] Subsequently, about 0.1 to 10 parts by weight of a peptizing agent is added to about 100 parts by weight of the slurry to form a dispersed slurry (mixture of water and powder), and then a flocculant including about 0.01 to 2 parts by weight of waste gypsum. The particles contained in the slurry form an agglomerate by attracting other particles with each other to form agglomerates, and a porous slurry is prepared using self-gelling of PSHP between these agglomerates. At this time, the peptizing agent comprises Na 2 SiO 3 , Na 4 P 2 O 7 or Na 2 CO 3 , The flocculant Al 3+ , Mg 2+ , Sr 2+ , Ba 2+ , Ca 2+ , Inorganic salts containing any one or more of Li + , K + or Na + .
    [36] In the present invention, it is preferable that the first non-plastic powder contains coal ash, and the second plastic powder preferably contains clay. In addition, the peptizing agent is preferably comprising a Na 2 SiO 3, the coagulant preferably includes a pyeseokgo. Table 1 shows the results of analyzing the chemical composition of the slurry comprising the first powder, the second powder and the flocculant according to the present invention.
    [37] SiO 2 Al 2 O 3 Fe 2 O 3 CaOMgONa 2 OK 2 OTiO 2 P 2 O 5 SO 3 Ig-loss clay61.6722.743.490.610.480.421.570.290.05ㆍ8.67 Coal ash65.2822.873.930.850.550.240.911.220.25ㆍ3.82 Waste gypsum1.980.70.1131.66ㆍㆍㆍㆍㆍ46.9520.32
    [38] When the content of the non-plastic first powder in the slurry is less than about 10 weight percent, properties such as strength and abrasion resistance are lowered, and when the content of the first powder exceeds about 70 weight percent, particles in the slurry are stably added. The problem of not being distributed appears. In addition, when the content of the second plastic powder in the slurry is less than about 30% by weight, it is difficult to produce a slurry due to the aggregation of particles, and when the content of the second plastic powder exceeds about 90% by weight, the non-plasticizer The problem arises that the characteristics of one powder are not expressed at all.
    [39] When the peptizing agent is added in less than about 0.1 parts by weight with respect to about 100 parts by weight of the slurry, there is a problem that the particles are not dispersed due to insufficient amount of adsorption on the surface of the solid particles in the slurry, When the amount exceeds about 10 parts by weight, the electrolyte concentration in the slurry becomes high so that the particles are not dispersed, and the amount of the liquid phase becomes too large when the molded body is sintered, resulting in a deformation of the ceramic sintered body.
    [40] The flocculant includes waste gypsum based on CaSO 4 , which is generated in large quantities in a desulfurization process, phosphoric acid, hydrofluoric acid, boron, titanium, and the like. At this time, when the flocculant is added in an amount of less than about 0.01 part by weight with respect to about 100 parts by weight of the slurry, there is a problem that the aggregation of the particles does not occur smoothly, when the content of the flocculant exceeds about 2 parts by weight Due to the difficulty in controlling the size of the aggregate, the size of the aggregate becomes so large that the aggregate settles, making it difficult to manufacture a ceramic porous body having a uniform pore size.
    [41] According to the present invention, the slurry is peptized using a peptizing agent, and then divalent ions are added to the peptized slurry as a coagulant, thereby reducing the electric double layer in the slurry to increase the viscosity, and using the gelation of the slurry to fine-tune By adjusting the structure, it is possible to produce a ceramic porous body having a uniform pore structure. In general, according to the Hofmeister series, the aggregation effect of SO 4 2- is the largest in the case of anions, and the larger the ionic value and the smaller the ion radius, the larger the aggregation effect. Accordingly, in the present invention, waste gypsum containing CaSO 4 as a main component, which is generated in large quantities in a desulfurization process or a manufacturing process such as phosphoric acid or hydrofluoric acid, is used as a flocculant. The addition of the coagulant containing waste gypsum to the dispersed slip produces the same effect as the concentration of the electrolyte increased according to the Schultz-Hardy rule, reducing the electrical double layer in the slip, resulting in coagulation of particles. ), The viscosity of the slurry gradually increases.
    [42] Hereinafter, a method of manufacturing a ceramic porous body recycled solid waste according to exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the following experimental examples.
    [43] Experimental Example 1
    [44] A slurry was prepared by mixing 300 g of coal ash, the first powder having a non-plasticity, and 120 g of clay, the second powder having a plasticity, to uniformly disperse the mixture of the first powder and the second powder in 250 g of water. . At this time, the slip specific gravity was about 1.60 g / cm 3.
    [45] Subsequently, water glass containing Na 2 SiO 3 as a peptizing agent was continuously added to the slurry from about 1.0 g to about 60 g in about 5 g units. At this time, the viscosity change of the slurry was measured at about 20 rpm for about 15 seconds using a viscometer (Brookfield viscometer DVII +).
    [46] Figure 2 is a graph showing the viscosity change of the slurry according to the addition amount of the peptizing agent to the slurry containing coal ash and clay according to the present invention.
    [47] Referring to FIG. 2, the viscosity of the slurry gradually decreased as the amount of the peptizing agent increased, but did not decrease any more until a constant value was reached, at which time the viscosity was about 200 cP.
    [48] The slurry was aged for about 24 hours, and then the viscosity of the slurry was measured by the method described above using a viscometer while adding waste gypsum containing CaSO 4 as a flocculant to 13 g in 7 g units to about 0.5 g units. When the amount of flocculant in the slurry was increased so that the viscosity of the slurry was about 1000-1500 cP, it was injected into a mold having a specification of about 20 φ 0 hm / m to form a molded body, and the molded body was naturally dried first.
    [49] Subsequently, after the primary molded product was first dried for about 24 to 48 hours, the primary dried molded product was again put into a drier. The molded body was completely dried by drying the molded body in a drier at a temperature of about 100 ° C. for 24 hours.
    [50] Next, the dried molded body was put into an electric furnace, and the temperature of the electric furnace was raised to about 1150 ° C at a temperature rising rate of about 10 ° C / hr, and the molded body was sintered by maintaining the temperature for about 2 hours. After the sintered compact was formed in the electric furnace, the sintered compact was cooled in the electric furnace.
    [51] The dispersed slurry in which the peptizing agent is added at about 2 parts by weight or less with respect to about 100 parts by weight of the slurry has a very low viscosity, and such a low viscosity is a high repulsive particle network, as shown in FIG. It appears as a behavior of a repulsive particle network. On the other hand, when the amount of the peptizing agent is about 3 parts by weight or more, the concentration of the electrolyte is increased and the electric double layer in the slurry is reduced, so that the powders are precipitated by the aggregation of powders, thereby forming an unstable slurry.
    [52] Figure 3 is a graph measuring the apparent specific gravity of the molded body and sintered body including the coal ash and clay according to the present invention.
    [53] Referring to FIG. 3, when the waste gypsum containing CaSO 4 is added to the slurry containing coal ash and clay dispersed as the peptizing agent is added, the viscosity of the slurry is increased while the viscosity of the slurry is shown in FIG. It exhibits weak attractive non-contact cohesive mesh structure as shown, indicating shear thinning behavior. The rheological behavior of the flocculated slurry will depend on the amount of waste gypsum containing CaSO 4 added flocculant. That is, the viscosity of the slurry increases exponentially as the amount of flocculant added increases. As shown in FIG. 3, in the case of the molded body and the sintered body prepared from the slurry having about 1.60 g / cm 3, the apparent specific gravity was about 37 percent and about 40 percent, respectively.
    [54] However, when the amount of the coagulant added to 100 parts by weight of the slurry exceeds 15 parts by weight, the content of the agglomerates is excessively large and the viscosity of the slurry is rapidly increased, thereby greatly reducing the fluidity of the slurry and forming the slurry into a molded body. It becomes very difficult. Therefore, by controlling the amount of the flocculant including CaSO 4 added to the slurry, it is possible to adjust the size of the network structure newly formed in the slurry, and furthermore, to control the size of the pores in the slurry.
    [55] On the other hand, as shown in (c) of FIG. 1 (see Ceramic Transaction, Vol. 22, 185p to 201p (1991)), the particles in the aggregated slurry are weakly fixed, so that the peptizing agent is dissolved from the particle surface to form PSHP (Poly -Silicon Hydroxo Precipitate) re-adsorbs, resulting in gelation of the slurry.
    [56] Figure 4 is a graph showing the pore size distribution of the molded body and the sintered body according to the present invention. As shown in FIG. 4, in the case of the molded body and the sintered body manufactured from the slurry having a specific gravity of about 1.60 g / cm 3, it was confirmed that most pores formed in the molded body and the sintered body had a particle diameter of about 4 to 5 μm. Can be. That is, since the pore size distribution of the molded body and the sintered body has a unimodal distribution of about 2.5 μm, aggregates are formed by the addition of divalent ions, and gelation of such aggregates occurs, so that the ceramic porous body having a uniform pore distribution is obtained. Manufacturing is possible.
    [57] Experimental Example 2
    [58] A slurry was prepared by mixing 350 g of coal ash, the first powder having a non-plasticity, and 150 g of clay, the second powder having a plasticity, to uniformly disperse the mixture of the first powder and the second powder in 300 g of water. . At this time, the slip specific gravity was about 1.55 g / cm 3.
    [59] In the present experimental example, the manufacturing process of the ceramic porous body including the content of the peptizing agent and the coagulant added to the slurry and subsequent molding and sintering is the same as in Example 1 described above. The viscosity of the slurry according to the present embodiment and the apparent specific gravity of the sintered body of the molded article prepared from such slurry are shown in FIGS. 2 and 3, respectively.
    [60] Experimental Example 3
    [61] 500 g of coal ash, which is the first powder, and 200 g of clay, which is the second powder were mixed to form a mixture, and then a mixture of the first powder and the second powder was uniformly dispersed in 350 g of water to prepare a slurry. At this time, the slip specific gravity was about 1.65 g / cm 3.
    [62] In the present experimental example, the manufacturing process of the ceramic porous body including the content of the peptizing agent and the coagulant added to the slurry and subsequent molding and sintering is the same as in Example 1 described above. The viscosity of the slurry according to the present embodiment and the apparent specific gravity of the sintered body of the molded article prepared from such slurry are shown in FIGS. 2 and 3, respectively.
    [63] Experimental Example 4
    [64] A slurry was prepared by mixing 550 g of coal ash, which is a non-plastic powder, and 250 g of clay, which was a second plastic powder, to form a mixture, and then uniformly dispersing the mixture in 350 g of water. At this time, the specific gravity of the slurry was about 1.68 g / cm 3. In the present experimental example, the manufacturing process of the ceramic porous body including the content of the peptizing agent and the coagulant added to the slurry and subsequent molding and sintering is the same as in Example 1 described above.
    [65] Experimental Example 5
    [66] 350 g of stone powder, which is non-plastic, and 200 g of clay, which is a second plastic, were mixed to form a mixture, and then the mixture was uniformly dispersed in 250 g of water to prepare a slurry. In this case, the specific gravity of the slurry was about 1.59 g / cm 3. In the present experimental example, the manufacturing process of the ceramic porous body including the content of the peptizing agent and the coagulant added to the slurry and subsequent molding and sintering is the same as in Example 1 described above.
    [67] Experimental Example 6
    [68] 420 g of stone powder, which is a non-plastic powder, and 250 g of clay, a second powder having plasticity, were mixed to form a mixture, and then the mixture was uniformly dispersed in 280 g of water to prepare a slurry. At this time, the specific gravity of the slurry was about 1.61 g / cm 3.
    [69] Experimental Example 7
    [70] A powder was prepared by mixing 480 g of stone powder, which is a non-plastic powder, and 300 g of clay, which is a second plastic powder, to form a mixture, and then uniformly dispersing the mixture in 300 g of water to prepare a slurry. At this time, the specific gravity of the slurry was about 1.63 g / cm 3.
    [71] As described above, according to the present invention, a ceramic porous body including a plurality of pores having a uniform particle size distribution may be manufactured. Such a porous ceramic body can be fully utilized as lightweight aggregate or other building and civil engineering materials.
    [72] In addition, according to the present invention, by adjusting the fine structure of the slurry, it is possible to easily control the characteristics and the size of the pores of the molded or sintered body produced from such a slurry.
    [73] Furthermore, according to the present invention, since the ceramic porous body is manufactured by inducing peptizing and agglomeration of the slurry using a peptizing agent and a coagulant made of inorganic matter, not an organic additive as in the conventional case, a separate organic matter removing process is not required. The simplicity and economy of the process can be achieved while producing environmentally friendly ceramic products.
    [74] In particular, according to the present invention, since waste gypsum generated in a desulfurization process, phosphoric acid, hydrofluoric acid, boron, or titanium manufacturing process can be recycled as a coagulant to produce a ceramic product, it contributes to environmental problems and at the same time produces a ceramic product. Can be significantly lowered.
    [75] While the above has been described in detail with respect to the preferred experimental examples of the present invention, the present invention is not limited by the above experimental examples, the present invention without departing from the gist of the invention claimed in the following claims Anyone with ordinary knowledge in the field will be able to make various changes.
    权利要求:
    Claims (5)
    [1" claim-type="Currently amended] Mixing 20 to 60 parts by weight of the first powder of the solid waste having non-plasticity and 20 to 40 parts by weight of the second powder having the plasticity to form a mixture;
    Adding 20 to 40 parts by weight of water to the mixture to form a slurry;
    Adding 0.1 to 10 parts by weight of a peptizing agent to the slurry to form a dispersed slurry;
    Adding 0.01 to 2 parts by weight of a flocculant to the dispersed slurry to form agglomerates;
    Forming a compact by self-gelling of the aggregate; And
    A method of manufacturing a ceramic porous body having a uniform pore structure comprising the step of sintering the molded body.
    [2" claim-type="Currently amended] The method of claim 1, wherein the solid waste is any one or more selected from the group consisting of coal ash, ash and incineration ash, the second powder is any one or more selected from the group consisting of clay, kaolin, pottery and mica minerals, The agent is any one or more selected from the group consisting of Na 2 SiO 3 , Na 4 P 2 O 7 and Na 2 CO 3 A method for producing a ceramic porous body having a uniform pore structure.
    [3" claim-type="Currently amended] The method of producing a ceramic porous body having a uniform pore structure according to claim 1, wherein the flocculant comprises waste gypsum containing CaSO 4 .
    [4" claim-type="Currently amended] The method of claim 1, wherein the forming of the molded body comprises:
    Naturally drying the molded body for 24 to 48 hours;
    The method of manufacturing a ceramic porous body having a uniform pore structure further comprising the step of drying the molded body for 20 to 30 hours at a temperature of 50 ~ 150 ℃ in a drying furnace.
    [5" claim-type="Currently amended] The method of claim 1, wherein the forming of the sintered body comprises:
    Inserting the molded body into an electric furnace and sintering at a temperature of 1100 to 1200 ° C. for 1 to 3 hours; And
    The method of manufacturing a ceramic porous body having a uniform pore structure, further comprising the step of cooling the sintered body in an electric furnace.
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    同族专利:
    公开号 | 公开日
    KR100530096B1|2005-11-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2003-01-03|Application filed by 경기대학교
    2003-01-03|Priority to KR10-2003-0000309A
    2004-07-09|Publication of KR20040062784A
    2005-11-22|Application granted
    2005-11-22|Publication of KR100530096B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR10-2003-0000309A|KR100530096B1|2003-01-03|2003-01-03|Method for manufacturing porous ceramic body by recycling waste material having solid phase|
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