• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL2003597A
    申请号:NL2003597
    申请日:2009-10-06
    公开日:2010-05-12
    发明作者:Wilhelm Eitel
    申请人:Kronos International；
    IPC主号:
    专利说明:

    Titanium-containing additive and method for its manufacture from chloride-containing residues from titanium dioxide production
    Field of the invention
    The invention relates to a titanium-containing additive for feeding into a furnace to increase the durability of the refractory lining, a method for its manufacture, and its use.
    Technological background of the invention
    The use of titanium-containing additives in furnaces (high-temperature facilities) with a refractory lining for melting reduction processes, particularly in blast furnaces, has been familiar for a long time. In this context, the effect of titanium-containing additives is based on the formation of high-temperature-resistant and wear-resistant Ti (C, N) compounds, which are partly deposited on the inner walls of the refractory lining of the furnaces, particularly in the hearth of blast furnaces, and increase the durability of the lining.
    The titanium-containing additive customarily used is lump ilmenite, as a natural titanium carrier. Furthermore, the use of residues from titanium dioxide production as a titanium-containing additive is also known. EP 0 611 740 B1 describes a titanium-containing additive consisting of digestion residues from titanium dioxide production by the sulphate process, together with materials containing coal and / or iron. According to EP 0 686 700 B1, additives containing alkaline earths, aluminum and / or S102 are likewise used, as a result of which the additive can also act as a blow-forming agent. DE 10 2007 055 751 All discloses a molded body containing titanium that can similarly be used as an additive for increasing the durability of refractory systems, and as a stroke protection and alloying agent, and that contains natural and, where appropriate, also synthetic titanium carriers . The term "natural titanium carriers" means tasks to mean titanium ores and Sorel slags. The term "synthetic titanium carriers" is tasks to mean, inter alia, residues from titanium dioxide production. DE 198 30 102 Cl specifically discloses the use of a fine-grained product, occurring during the production of titanium dioxide by the chloride process, for injection into a blast furnace to increase the durability of the refractory lining. The fine-grained product is preferably used in a mixture with components containing iron, alkaline earths and / or aluminum oxide or hydroxide.
    Object and letter description of the invention
    The object of the invention is to put a chloride-containing co-product or titanium dioxide production to commercial use.
    The object is solved by a titanium-containing additive for feeding into a furnace to increase the durability of the refractory lining, characterized in that it contains chloride-containing residues from titanium dioxide production, to which has been admixed at least one substance from the group including alkali hydroxide, alkali carbonate, alkali hydrogencarbonate and alkaline earth carbonate.
    The object is further solved by a method for manufacturing a titanium-containing additive, characterized in that chloride-containing residues from titanium dioxide production are mixed with at least one substance from the group including alkali hydroxide, alkali carbonate, alkali hydrogencarbonate and alkaline earth carbonate in least stoichiometric quantities in reference to chloride.
    Further advantageous of the invention are described in the subclaims.
    Description of the invention
    In the chloride process for manufacturing titanium dioxide, titanium tetrachloride is produced in a first step by chlorinating titanium-containing raw materials. Chlorination is performed in a fluidized-bed reactor in the presence of coke at temperatures in the region of 1,000 ° C, and leads to the formation of volatile metal chlorides. When discharging the metal chlorides from the reactor, fine bed material is also entrained, particularly unreacted titanium-containing raw material (T1O2), further inert metal oxides from the raw material (particularly S1O2) and coke. This gas / solid mixture is cooled to approx. 150 ° C. The solid component is separated out in a cyclone. The fine-grained mixture of solids obtained in this way is customarily also referred to as cyclone dust.
    The cyclone dust is subsequently washed and, after drying, contains roughly 40 to 60% by weight coke, roughly 25 to 45% by weight T1O2 and roughly 5 to 15% by weight S1O2 as its principal constituents. The moisture content is usually roughly 20 to 35% by weight, and the chloride content is up to roughly 1% by weight. The material obtained in this way, referred to as "chloride-containing residue" below, reacts acid and has a highly corrosive effect.
    Because of its acid character, further processing of the chloride-containing residue is thus problematic, since materials used in machinery, such as steel, high-grade steel, non-ferrous metals and aluminum, are exposed to substantial corrosive attack and the machines are damaged as a result. Moreover, there are health risks for the affected personnel, and possibly also environmental risks.
    According to the invention, the chloride-containing residue is therefore mixed with at least one substance from the group including alkali hydroxide, alkali carbonate, alkali hydrogen carbonate and alkaline earth carbonate. Mixtures of these substances can also be used. The alkalis are involved, for example, Na and K. The alkaline earths are preferably Ca and Mg.
    The chloride-containing residue treated in this way is neutral and suitable for use as a titanium-containing additive in industrial melt reduction processes to increase the durability of refractory lining in furnaces. Within the framework of the invention, "furnaces" is tasks to mean all children or high-temperature facilities with a refractory lining. The titanium-containing additive according to the invention can be used directly or first subjected to further processing, without incurring high tool costs as a result of corrosion.
    The neutralizing agent is added at least stoichiometric quantities referred to the chloride content, i.e. in quantities or roughly 0.5 to 50 kg per metric ton of chloride-containing residue. Neutralization produces the corresponding alkali chlorides, such as sodium chloride or potassium chloride, and alkaline earth chlorides, such as calcium chloride or magnesium chloride. If carbonate compounds are added, the carbonate component escapes in the form of CO2. The alkali content in the titanium-containing additive according to the invention is not detrimental to use in furnaces with a refractory lining.
    Neutralization is preferably performed in an inert-lined mixer, e.g. in a rubber-lined mixer, particularly in a continuous mixer. The chloride-containing residue neutralized in this way can be further processed, e.g. pelletized or briquetted, dried in moist condition and further. Alternatively, the neutralized chloride-containing residue can be three directly to obtain a powdery product.
    In a further embodiment of the invention, the neutralized chloride-containing residue can be mixed with further additives in an intermediate step, eg with a binder such as cement, filter ash, bitumen, etc. In another embodiment of the method, at least one impact forming agent can additionally be admixed, such as alkaline earth, aluminum or silicon oxide.
    The neutralized chloride-containing residue is suitable as a titanium-containing additive for use in furnaces with a refractory lining to increase the durability of the refractory lining. It can be injected into the furnace in powdery form with a particle size of less than roughly 5 mm, or introduced into the furnace in agglomerated form (as granules, pellets, briquettes, etc.) with particle sizes of greater than roughly 5 mm.
    Moreover, the titanium-containing additive is also suitable for use as an energy carrier and sintering aid in the ceramic and clay industry.
    Examples
    The invention is explained on the basis of the following examples, which are not intended as a limitation of the invention.
    Example 1 1 kg of a moist cyclone dust with a chloride content of roughly 0.5% by weight, obtained from carbochlorination, was pasted up to a 10% by weight aqueous suspension. The pH value was 2.9. 5.8 g of NaOH were admixed in the form of a 0.1 molar sodium hydroxide solution (NaOH). A pH value of 7 was subsequently obtained.
    Example 2 1 kg of a moist cyclone dust with a chloride content of roughly 0.5% by weight, obtained from carbochlorination, was pasted up to a 10% by weight aqueous suspension. The pH value was 2.9. 13.2 g of Na 2 CO 3 were admixed in the form of a 0.1 molar Na 2 CO 3 solution. A pH value of 7 was subsequently obtained.
    Example 3
    Same as Example 1, the difference being 8.1 g of KOH in the form of a 0.1 molar potassium hydroxide solution (KOH) was used instead of NaOH.
    权利要求:
    Claims (8)
    [1]
    Claims 1. Titanium-containing additive for addition to an oven to increase the shelf life of the refractory coating, characterized in that it contains residues from the titanium dioxide preparation containing choloride containing at least one substance from the group consisting of alkali hydroxide, alkali carbonate alkali metal hydrogen carbonate and alkaline earth metal carbonate are mixed.
    [2]
    Titanium-containing aggregate according to claim 1, characterized in that the aggregate is agglomerated to grain sizes of more than 5 mm.
    [3]
    3. Process for the preparation of a titanium-containing additive, characterized in that chloride-containing residues from the titanium dioxide preparation are mixed with at least one substance from the group consisting of alkali hydroxide, alkali carbonate, alkali hydrogen carbonate and alkaline earth carbonate with respect to chloride in at least stoichiometric amount. .
    [4]
    Method according to claim 3, characterized in that the titanium-containing additive is subsequently agglomerated to grain sizes of more than 5 mm.
    [5]
    Process according to claim 4, characterized in that a binder is admixed before agglomeration.
    [6]
    Method according to claim 3 on 4, characterized in that at least one slag-forming substance such as, for example, alkaline earth metal, aluminum oxide or silicon oxide is mixed with before agglomeration.
    [7]
    Use of the titanium-containing additive according to claim 1 or 2 in the melt metallurgical industry.
    [8]
    Use of the titanium-containing additive according to claim 1 or 2 in the ceramic and clay industry.
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    同族专利:
    公开号 | 公开日
    NL2003597C2|2010-11-24|
    FR2938256A1|2010-05-14|
    DE102008056809A1|2010-05-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4304724C1|1993-02-17|1994-05-05|Metallgesellschaft Ag|Additive for strengthening oven refractory walls - comprises residues from titanium di:oxide prodn, coal residues, iron- and iron oxide-contg residues|
    DE4419816C1|1994-06-07|1995-06-29|Metallgesellschaft Ag|Titanium-contg. additive used in refractory linings and as a slagging agent|
    DE19830102C1|1998-07-06|1999-07-29|Metallgesellschaft Ag|Chloride process titanium dioxide production waste fines are used to increase refractory lining durability|
    DE102007055751A1|2006-12-08|2008-06-12|Sachtleben Chemie Gmbh|Process to form titanium pellets for admixture to iron smelt|EP2415880A1|2010-08-03|2012-02-08|Sachtleben Chemie GmbH|Additive containing coke and titanium and use of same to repair the cladding of metallurgical containers|
    法律状态:
    2013-05-15| V1| Lapsed because of non-payment of the annual fee|Effective date: 20130501 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE200810056809|DE102008056809A1|2008-11-11|2008-11-11|Titanium-containing aggregate and process for its preparation from chloride-containing residues of titanium dioxide production|
    DE102008056809|2008-11-11|
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