• 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:
    Producing a briquetted oxidic feed for a blast furnace by pelletizing very fine zinc oxide or zinc oxide and lead oxide powder into pellets having an average diameter of from 2 to 10 millimeters prior to briquetting the oxide pellets at a temperature of from 500 DEG to 800 DEG C and a pressure of from 1 to 20 tons/square inch.
    公开号:SU869563A3
    申请号:SU731981235
    申请日:1973-12-10
    公开日:1981-09-30
    发明作者:Фрэнк Гаррис Колин
    申请人:Металлурджикал Просесиз Лимитед (Фирма)；Империал Смелтинг Корпорейшн Лимитед(Фирма),Действующие Вместе На Багамских Островах Под Названием "Металлурджикал Дивелопмент Компани" (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the preparation of charge material for blast furnace smelting of zinc or zinc and lead, in particular to the production of briquettes of zinc oxide and zinc oxide together with: lead oxide, suitable for loading into a blast furnace.
    A known method of producing briquettes from oxide material for loading into a blast furnace, comprising the following successive stages:
    a) the desulphurization of a sulfide feedstock, mainly containing zinc or lead or a mixture of zinc and lead, and grinding, if necessary, of an oxide material in the form of particles;
    b) pressing the specified oxide material in the form of particles at a pressure of 0.15-3.1 t / cm 1 and at a temperature of at least 500 ° C without adding carbon or other binder, with the formation of lump oxide loading material G1].
    Although this method can be successfully carried out for the production of cinder, i.e. finely ground material obtained by calcining zinc-lead sulfide ores in a kiln (for example, in a fluidized bed kiln), this method is completely unsuitable for finely ground zinc dust obtained by a process such as, for example, the Waelz furnace process, in which the crude solid components from zinc and iron oxides are reduced with a carbonaceous reducing agent in a rotary kiln with countercurrent air supply to obtain a suspension of finely ground zinc oxide, which is collected dissolved in bag filters.
    This very finely ground zinc oxide is difficult to process and has poor fluidity when fed to a press, such as a roller press to produce briquettes. As a result, the oxide can pass through the press without the formation of briquettes or its compaction is not sufficient for the formation of briquettes during repeated pressing.
    The purpose of the invention is to increase the strength of briquettes obtained from fine zinc oxide or zinc oxide and lead oxide, suitable for loading in a blast furnace.
    The goal is achieved in that previously pellets with an average diameter of 2-10 mm, preferably 2-6 mm, are formed from finely divided oxide material. Then they are heated to 500-800 ° C and pressed into briquettes under a pressure of 0.15-3.1 t / cm 2 without adding a binder.
    • Zinc oxide is preferably used as loading oxide, although it may contain up to 50% by weight of lead oxide. When using large amounts of lead oxide, the conditions for briquetting should be changed. Of course, in addition to lead oxide, the material from zinc oxide can contain up to 25% of the total amount of the material of other impurities, for example, cadmium oxide, calcium oxide, silicon dioxide or iron oxide, although usually the material normally does not contain more than 10 wt.% Such impurities .
    Preferably, the step of forming spherical particles is carried out in an apparatus such as a disk or drum type panning machine. In such an apparatus, finely ground powder and water are supplied to an obliquely rotating disk or to a rotating hollow drum. When the disk or drum rotates, the powder is thrown off onto its surface moving upward, and this powder is removed from the surface by means of scraper blades and again falls to the bottom of the disk or drum, from where it is again carried to the rotating surface. Continuous rotation of the wet powder particles leads to the formation of spherical pellets. The pellets are then heated to 500800 ° C., after which the briquetting step is carried out.
    Alternatively, pellets can be made from fine powder by passing it through a heated rotary kiln (known as an agglomeration kiln) at 900-1300 ° C. The pellets are then cooled from 500 to 800 ° C. before the briquetting step.
    It is useful to add a certain amount of finely ground carbonaceous solid particles, for example coke breeze, to zinc oxide or to zinc oxide and lead oxide before briquetting, in order to improve fuel economy in the melting process by reducing the amount of metallurgical coke that must be fed into the blast furnace together with briquettes . Under normal conditions, such carbon particles do not function as a binder, but serve only to introduce a certain amount of carbon into the oxide feed in order to reduce the amount of reducing agent to be introduced into the furnace.
    The proposed method is successfully carried out using the following feedstock: Waelz oxide dust, a blue powder obtained by washing on a scrubber the gases leaving the blast furnace condenser to produce zinc, and Beghouse oxide, which forms zinc oxide in the apparatus for producing zinc oxide.
    Of these raw materials, Waelz oxide dust and Beghouse oxide are low-purity zinc oxide containing a relatively small amount of impurities, while blue powder is a partially metallized, partially oxide zinc-lead material formed by washing water from an irrigation gas on a scrubber capacitor for lead blast furnace to produce zinc. A more accurate analysis of these materials is given in the examples below.
    Although the preferred starting material for the proposed method is finely divided zinc oxide obtained by oxidation of zinc vapor, other zinc oxides can be used, for example, oxides obtained by calcining zinc sulfide and grinding the resulting product. Thus, finely divided oxides obtained by vapor-phase oxidation, for example, Waelz oxide or Beghouse oxide collected from a gas stream, are the preferred starting material.
    It is recommended that the pellets before feeding to the briquette press and were dried so that their temperature was brought to a temperature of at least '600 S. This is especially important if the water content in the pellets is high, for example, after their formation operation in the drum. Pellets are fed through the hopper to the roller press in the usual way and they are pressed in the usual way with the formation of briquettes with good mechanical strength. The strength of the briquettes to crack in the cold state is more than 80%, and such strength in the hot state is more than 90% if the briquettes are obtained both from Waelz oxide and from blue powder using the proposed method at a briquetting temperature of about 700 ° C.
    Example 1. Waelz oxide, containing 60.0 wt.% Zinc, 11.6 wt.% Lead and 1.7 wt.% Sulfur, is fed in the form of a fine powder together with water onto a rotating disk on which almost spherical particles are formed with average diameter from 2 to 6 mm. These pellets are heated in a preheated furnace located above the shaft -.
    with a forging press, up to 650 ° С and then they are fed through the hopper to the screw feeder into the recesses of the roller press. Briquetted at this temperature and under a pressure of 210.9 kg / cm 2 . The size of the holes is 31 to 21 mm, and their volume is approximately'6.5 mm. 5 The strength of the obtained briquettes to cracking in the cold state is 87 ° · and in the hot state - 95%, bulk density is 4.67 g / ml, and the apparent porosity ·· is 13.5%.
    EXAMPLE 2. From Beghouse oxide containing 80 wt.% Zinc in the form of oxide, spherical pellets with an average diameter of 2 to 6 mm are formed, i.e. 15 as in example 1. These pellets are heated in an oven to 800 ° C, and then, after bringing the temperature to 660 ° C, they are briquetted under a pressure of 210.9 kg / cm 1 on a roller press. The strength of the obtained 20 briquettes for cracking in the cold state is 95%, while in the hot state it is 77%, the bulk weight is 4.51 g / ml, and the apparent porosity is 19.6%. 25
    Example 3. 40 wt.% Blue powder containing 33.9 wt.% Zinc, 30.9 wt.% Lead and 5.3 wt.% Sulfur and 60 wt.% Beghouse oxide containing 80 wt.% Zinc, are mixed _ n and served together with water on a rotatable disk and formed into almost spherical pellets with an average diameter of more than 2 mm. These tablets are heated in furnaces to 800 ° C and, after being brought to 670 ° C, briquetted under pressure. '210.9 kg / cm 1 on a roller press with the parameters specified in example 1. The strength of the obtained briquettes to cracking in the cold state is 92%, in the rock state - 40 99%, the bulk weight is C
    4.98 g / ml, and the apparent porosity is 10.6%.
    PRI me R 4. Polished Waelz oxide containing 46 wt.% Zinc, 9 wt.% Lead, 6 wt.% Iron, 2.6 wt.% Sulfur, 6 wt.% Calcium oxide and 6.3 weight .% silicon dioxide, pellets to a size of 26 mm in diameter, preheated in an oven at 845 ° C after being brought to 750 ° C, briquetted under a pressure of 210.9 kg / cm ^.
    The strength of the obtained briquettes to cracking in the cold state is 84%, bulk density of 3.79 g / ml, and the apparent density of 19.1%.
    权利要求:
    Claims (2)
    [1]
    The invention relates to the preparation of a batch material for blast smelting of zinc or zinc and lead, in particular to the preparation of briquettes of zinc oxide and zinc oxide together with. lead oxide suitable for loading into a blast furnace. A method is known for producing briquettes from an oxide material for loading into a blast furnace, comprising the following successive stages: a) desulfurizing sulphide raw materials, mainly containing zinc or lead or a mixture of zinc and lead, and grinding, if necessary, the oxide material located in the form particles) b) pressing the specified oxide material, which is in the form of particles, under a pressure of 0.15-3, and at a temperature of not less than 500 ° C without the addition of carbonaceous or other binder, with the formation of lumpy oxide logging full-time of the material in Tl. Although the method can be successfully carried out for the production of stubs, i.e. finely ground material obtained by roasting zinc-lead sulfide ores in a roasting apparatus (for example, in a fluidized bed roasting furnace), this method is completely unsuitable for finely ground zinc dust produced by a process such as, for example, the Velz furnace process, by which untreated solid components from zinc and iron oxides are reduced with a carbonaceous reducing agent in a rotary kiln with countercurrent air supply, and a suspension of tootminized zinc oxide is obtained, which is Take in bag filters. This very finely divided zinc oxide is difficult to process and has poor flowability when fed to a press, such as a roller press to produce briquettes. As a result, the oxide can pass through the press without the formation of briquettes or its thickening is not enough to form briquettes upon repeated pressing. The purpose of the invention is to increase the strength of briquettes obtained from finely dispersed zinc oxide or zinc oxide and lead oxide, suitable for loading into a blast furnace. The goal is achieved by the fact that preformed from a finely dispersed oxide material is molded okay with an average diameter of 2-10 mm, preferably 2-6 mm. Then they are heated to ZOO-BOO C and pressed into briquettes under a pressure of 0.15-3.1 t / cm without the addition of a binder. Zinc oxide is preferably used as a loading oxide, although it can contain up to 50% by weight of lead oxide. When using a large amount of lead oxide, it is necessary to change the conditions of compacting. Of course, in addition to lead oxide, zinc oxide material may contain up to 25% of the total amount of material of other impurities, such as cadmium oxide, calcium oxide, silicon dioxide or iron oxide, although usually the material does not normally contain more than 10% by weight of such impurities. Preferably, the step of forming spherical particles is carried out in an apparatus such as a disc or drum type dredger. Fine powder and water are fed to such an apparatus on an inclined rotating disk or on a rotating hollow drum. When the disk or drum is rotated, the powder is thrown onto the surface moving upward, and this powder is removed from the surface using scraper blades and again falls to the bottom of the disk or drum, from where it is carried away to the rotating surface. Continuous rotation of wet particles of the powder leads to the formation of pellets of spherical shape. The pellets are then heated to 500 ° C, after which the briquetting step is carried out. Alternatively, pellets can be made from a finely divided powder by passing it through a heated rotary kiln (known as a sintering kiln) at 900–1300 s. Okat шиs are then cooled from 500 to before the briquetting step. It is useful to add some finely divided carbonaceous solid particles, such as coke breeze, to zinc oxide or to zinc oxide and lead oxide before briquetting, in order to improve fuel economy in the process of melting to reduce the amount of metallurgical coke that needs to be fed to the blast furnace. together with briquettes. Such carbonaceous particles in usual conditions do not function as a binder, but serve only for the introduction of a certain amount of carbon into the oxide raw material in order to reduce the amount of the reducing agent to be introduced into the furnace. The proposed method is successfully carried out using the following feedstock: Balti oxide dust, blue powder obtained by scrubbing the gases from the blast furnace condenser to produce zinc, and Beghouse oxide formed in the zinc oxide plant. From this raw material, Velza oxide dust and Beghouse oxide are low-purity zinc oxide, containing a relatively small amount of impurities, while the blue powder is a partially metallized, partially oxide zinc-lead material formed during washing with water on a scrubber of gases leaving the irrigation condenser for the lead of a blast furnace to produce zinc. A more accurate analysis of these materials is given in the examples below. Although the preferred starting material for the proposed process is finely divided zinc oxide, obtained by oxidation of zinc vapor, other zinc oxides can be used, for example, oxides obtained by roasting zinc sulfide and grinding the resulting product. Thus, the preferred starting material is finely divided oxides obtained by vapor phase oxidation, for example, Welz oxide or Beghouse oxide collected from a gas stream. It is recommended that the OKATS be dried before being fed into the briquetting press and that their temperature is at least equal to the temperature. This is especially important if the moisture content in the pellets is high, for example, after the operation of forming them in the drum. The pellets are fed through a hopper into a roll press in the usual way and they are pressed in the usual way to form briquettes with good mechanical strength. The strength of cold cracking briquettes is more than 80%, and such hot strength is more than 90% if the briquettes are made from both Welz oxide and blue powder using the proposed method at a briquetting temperature s-about. EXAMPLE 1. Velts oxide, containing 60.0% by weight of zinc, 11.6% by weight of lead, and 1.7% by weight of sulfur, is served as a fine powder along with water to a rotating disk, on which form almost .skie particles with an average diameter of 2 to 6 mm. These pellets are heated in a preheated oven located above the shaft. with a press, before and then feed them through the hopper into a screw feeder into the recesses of the roller press. Briquetted at this temperature and under pressure of 210.9 kg / cm. The dimensions of the holes are 31 to 21 them, and their volume is about 6.5 mm. The strength of the obtained briquettes for cracking in a cold state is 87. and in a hot state - 95%, the volume weight is 4.67 g / ml and apparent porosity is 13.5%. Example 2. Beghawa oxide containing 80% by weight of zinc in the form of oxide forms spherical pellets with an average diameter of 2 to 6 mm, that is, as in Example 1. These pellets are heated in a furnace to 800 ° C, and then, after bringing the temperature up to 660 ° C, is briquetted under a pressure of 210.9 kg / cm on a roller press. The strength of the resulting cold cracking briquettes is 95% and 77% in the hot state, the volume weight is 4.51 g / ml, and the apparent porosity is 19.6%. Example 3. 40% by weight of a blue powder containing 33.9% by weight of zinc, 30.9% by weight of lead and 5.3% by weight of sulfur and 60% by weight of Beghouse oxide containing 80% by weight of zinc, mix and serve together with water on a rotating disk and formed into almost spherical pellets with an average diameter of more than 2 mm. These tablets are heated in an oven to 800 ° C and, after finishing, are pelletized under pressure. 21o, 9 kg / cm on a roller npecfce with the parameters specified in example 1 The strength of the resulting briquettes for cracking in the cold state is 92%, in the mountainous state 99%, bulk density is 4.98 g / ml, and apparent porosity is 10.6%. EXAMPLE 4 Polished Veld Oxide containing 46% by weight of zinc, 9% by weight of lead, 6% by weight of iron, 2.6% by weight of sulfur, 6% by weight of calcium oxide and 6.3% by weight % silicon dioxide, pellets to a size of 26 mm in diameter, are preheated in an oven at 845 s after finishing to briquetting under a pressure of 210.9 kg / cm. The strength of the resulting cold cracking briquettes is 84%, the volume weight is 3, 79 g / ml, and the apparent density is 19, 1%. Claim 1. Method for the production of briquettes from zinc oxide or a mixture of zinc oxide and lead oxide for smelting in a shaft furnace, including pressing under pressure of 0.15-3.1 t / cm at 500800С, differing from the fact that, in order to improve the integrity of briquettes from the finely dispersed material, pellets with an average diameter of 2-10 mm are obtained from the oxide material.
    [2]
    2. Method POP.1, of tl ich Ayu yi, and with the fact that the oaks are obtained in a rotary kiln at 900-1300C, after which they are cooled to 500-800 C. Priority points: According to Item 1, 11.12.72 . According to paragraph 2, 05/30/73. Sources of information taken into account during the examination 1. Application of the Federal Republic of Germany 2034791, cl. 40a 1/14, 04.02.71.
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    US3495973A|1970-02-17|Gas-solid reaction
    同族专利:
    公开号 | 公开日
    AU6333073A|1975-06-12|
    IN140878B|1977-01-01|
    DE2360346B2|1976-01-08|
    CS192508B2|1979-08-31|
    HU167804B|1975-12-25|
    DE2360346A1|1974-06-12|
    BG20123A3|1975-10-30|
    JPS4989624A|1974-08-27|
    FR2209846A1|1974-07-05|
    IT1002242B|1976-05-20|
    AU474430B2|1976-07-22|
    PL85621B1|1976-04-30|
    IE38603L|1974-06-11|
    CA988305A|1976-05-04|
    FR2209846B1|1977-09-30|
    TR17960A|1976-07-23|
    JPS5319287B2|1978-06-20|
    US3946098A|1976-03-23|
    IE38603B1|1978-04-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3231649A|1964-04-17|1966-01-25|Pullman Inc|Compaction method|
    US3401089A|1965-03-03|1968-09-10|Consolidation Coal Co|Process for agglomerating carbonaceous materials|
    GB1172693A|1966-03-28|1969-12-03|Consolidation Coal Co|A Process for Making Formcoke From Non-Caking Coals.|
    BE758222A|1969-10-29|1971-04-01|Norsk Hydro As|PROCESS FOR THE PREPARATION OF MAGNESIUM CHLORIDE SUITABLE FOR THE PRODUCTION OF MAGNESIUM BY ELECTROLYSIS OF MELT SALT|ZA793158B|1978-07-04|1980-07-30|Isc Smelting|Roasting of sulphide materials|
    DE3101886A1|1981-01-22|1982-08-26|Metallgesellschaft Ag, 6000 Frankfurt|METHOD FOR PRODUCING A BRIQUETTED INSERT MATERIAL FOR ZINC CHAMBER OVENS|
    JPS5840878U|1981-09-14|1983-03-17|
    JPS5945677U|1982-09-16|1984-03-26|
    JPS6397187A|1986-10-14|1988-04-27|Toshio Tanikado|Ball charging apparatus for pinball counter|
    EP2298941A4|2008-07-11|2016-10-19|Kobe Steel Ltd|Briquette manufacturing method, reductive metal manufacturing method, and zinc or lead separation method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB5709372A|GB1394609A|1972-12-11|1972-12-11|Preparation of feed material for a blast furnace|
    GB2563173|1973-05-30|
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