WO2012159342A1 - Process for extracting iron from high silicon alumohematite - Google Patents

Process for extracting iron from high silicon alumohematite Download PDF

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Publication number
WO2012159342A1
WO2012159342A1 PCT/CN2011/077532 CN2011077532W WO2012159342A1 WO 2012159342 A1 WO2012159342 A1 WO 2012159342A1 CN 2011077532 W CN2011077532 W CN 2011077532W WO 2012159342 A1 WO2012159342 A1 WO 2012159342A1
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Prior art keywords
iron
tailings
slurry
hematite
give
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PCT/CN2011/077532
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French (fr)
Chinese (zh)
Inventor
冯婕
韩京增
李祎
苑光国
王明银
张燕云
王伟
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山东乾舜矿冶科技股份有限公司
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Publication of WO2012159342A1 publication Critical patent/WO2012159342A1/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/26—Cooling of roasted, sintered, or agglomerated ores

Definitions

  • the invention relates to a smelting technology and is a high silicon-aluminum hematite iron lifting process.
  • Iron ore with high silicon and high aluminum content is difficult to select iron because of its high iron selection and high production cost. It has been considered as a problem of mineral processing in the field for many years. However, iron ore containing high silicon and high aluminum content has a large reserve in Guangxi and other places in China. Although the price of iron ore is low, it is still not fully utilized. In recent years, with the rising value of iron ore, the research topics of those skilled in the art have shifted to the iron storage of high-silica-high-aluminum iron ore with large reserves and underutilization.
  • the object of the present invention is to provide a high silicon aluminum hematite iron extraction process, which uses hematite ore containing high silicon and high aluminum as raw materials, and extracts iron concentrate by the process of the invention, so that the iron grade is greater than 68%, iron The recovery rate is greater than 97%.
  • a high silicon aluminum hematite iron raising process comprising the following steps:
  • the slurry is placed in a spiral chute for re-election, and an iron concentrate with a grade of 60% is selected, and a medium ore and tailings are obtained at the same time;
  • step 3 The medium ore product obtained in step 2 is placed in a ball mill to add water grinding, and the grinding concentration is 70%;
  • the tailings obtained in step 2 and the slurry obtained in step 3 are placed in a stirred tank and mixed, and then a dispersing agent is added, and the slurry is obtained by thoroughly stirring and slurrying, and the dispersing agent is composed of sodium silicate and sodium hexametaphosphate.
  • the weight ratio of sodium silicate to sodium hexametaphosphate is 3-4: 1, and 2.9-3.5 kg of dispersant is added per ton of hematite ore containing high silicon and high alumina as described in step 1;
  • step 4 The slurry in step 4 is sent to a strong magnetic machine for strong magnetic separation, and the magnetic field strength is 0.8T, and an iron concentrate and tailings with a grade of 61.2% are obtained;
  • step 6 The tailings in step 5 are placed in a concentration tank for concentration to obtain a slurry having a concentration of 75%;
  • the calcining reducing agent is composed of coke, calcium chloride and lime, coke and chlorine.
  • the weight ratio of calcium to lime is: 30-35: 3.5-4.5: 23-28, 210-260 kg of calcining reducing agent is added per ton of hematite ore containing high silicon high alumina as described in step 1;
  • the pellets are placed in a rotary kiln for reduction roasting.
  • the maximum temperature for calcination is 1300 °C.
  • the heating period is: normal temperature rise to 400 °C, heat preservation for 30 minutes, then heat up to 760 °C, keep warm for 30 minutes, then Heating to 950 ° C, holding for 30 minutes, then heating to 1150 ° C, holding for 30 minutes, then heating to 1300 ° C, holding for 30 minutes, to obtain reduced iron ball products;
  • the reduced iron ball product is placed in a roller crusher and ground to a fineness of -0.074 mm; 70%;
  • the ground material is placed in a weak magnetic separator for magnetic separation, the magnetic field strength is 0.08T, and the iron concentrate product and tailings are obtained; the tailings are recycled and reused;
  • the iron concentrates obtained in steps 2, 5 and 10 are combined and dehydrated by concentration to obtain an iron concentrate product.
  • the weight ratio of sodium silicate to sodium hexametaphosphate in the dispersant described in step 4 is 3.5:1.
  • the weight ratio of coke, calcium chloride and lime in the calcining reducing agent described in the step 7 is 33:4:25.
  • the iron raising process of the invention adopts hematite ore containing high silicon and high aluminum as raw materials, and after the whole process, can obtain iron concentrate with iron grade of 68.9% from high silicon high alumina iron ore, iron recovery rate It reached 98.7%, the yield reached 79.2%, the silica content in the iron concentrate was less than 3.1%, the aluminum oxide content was less than 2.9%, and the iron grade in the tailings was less than 393 ⁇ 4.
  • the process of the invention breaks through the technical difficulty of selecting iron in high silicon high alumina hematite ore, and provides for the mining of high silicon high alumina hematite in China. It provides a basis for the value of industrial use.
  • the price per ton is about 700 yuan.
  • the price is greatly reduced, which can greatly reduce the production cost of steel enterprises and alleviate the iron ore.
  • the large increase in the price caused by the large number of imports has put pressure on steel companies to significantly increase production costs.
  • the process of the invention also has the advantages of easy operation, high production safety and high stability.
  • a high silicon aluminum hematite iron lifting process according to the present invention comprises the following steps:
  • the hematite ore containing high silicon and high aluminum is placed in a stirred iron ore with a grade of 4593 ⁇ 4-5193 ⁇ 4, a silica content of 10.5-16.8%, and a yellow aluminum oxide of 7-11.5%.
  • the tank is stirred with water to form a slurry, and the concentration of the slurry is 15-25%;
  • the slurry is placed in a spiral chute for re-election, and an iron concentrate with a grade of 60% is selected, and a medium ore and tailings are obtained at the same time;
  • step 3 The medium ore product obtained in step 2 is placed in a ball mill to add water grinding, and the grinding concentration is 70%;
  • the tailings obtained in step 2 and the slurry obtained in step 3 are placed in a stirred tank and mixed, and then a dispersing agent is added, and the slurry is obtained by thoroughly stirring and slurrying, and the dispersing agent is composed of sodium silicate and sodium hexametaphosphate.
  • the weight ratio of sodium silicate to sodium hexametaphosphate is 3-4: 1, and 2.9-3.5 kg of dispersant is added per ton of hematite ore containing high silicon and high alumina as described in step 1, the preferred scheme is: Add 3.1kg of dispersant per ton of hematite ore containing high silicon and high aluminum;
  • step 4 The slurry in step 4 is sent to a strong magnetic machine for strong magnetic separation, and the magnetic field strength is 0.8T, and an iron concentrate and tailings with a grade of 61.2% are obtained;
  • step 6 The tailings in step 5 are placed in a concentration tank for concentration to obtain a slurry having a concentration of 75%;
  • the calcining reducing agent is composed of coke, calcium chloride and lime, coke and chlorine.
  • the weight ratio of calcium to lime is: 30-35: 3.5-4.5: 23-28, 210-260kg of calcining reducing agent is added per ton of hematite ore containing high silicon and high alumina as described in step 1.
  • the scheme is to add 240 kg of calcining reducing agent per ton of hematite ore containing high silicon and high aluminum;
  • the pellets are placed in a rotary kiln for reduction roasting.
  • the maximum temperature for calcination is 1300 °C.
  • the heating period is: normal temperature rise to 400 °C, heat preservation for 30 minutes, then heat up to 760 °C, keep warm for 30 minutes, then Heating to 950 ° C, holding for 30 minutes, then heating to 1150 ° C, holding for 30 minutes, then heating to 1300 ° C, holding for 30 minutes, to obtain reduced iron ball products;
  • the reduced iron ball product is placed in a roller crusher and ground to a fineness of -0.074 mm; 70%;
  • the ground material is placed in a weak magnetic separator for magnetic separation, the magnetic field strength is 0.08T, and the iron concentrate product and tailings are obtained; the tailings are recycled and reused;
  • the iron concentrate obtained in steps 2, 5 and 10 is combined and dehydrated to obtain an iron concentrate product with a yield of 78.11% and a grade of 68.7%, and a recovery of 97.68%.
  • the preferred embodiment described in the process step 4 of the present invention is that the weight ratio of sodium silicate to sodium hexametaphosphate in the dispersant is 3.5: l o
  • a further aspect of the process of the present invention is that the weight ratio of coke, calcium chloride to lime in the calcining reducing agent described in step 7 is 33:4:25.
  • the dispersing agent used in the step 4 of the present invention has various combinations of the weight ratio of sodium silicate to sodium hexametaphosphate: 1.
  • the weight ratio of sodium silicate to sodium hexametaphosphate is: 3: 1, sodium silicate
  • the weight ratio with sodium hexametaphosphate is: 3.3: 1.
  • the weight ratio of sodium silicate to sodium hexametaphosphate is: 3.2: 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 4: 1, silicic acid
  • the weight ratio of sodium to sodium hexametaphosphate is: 3.6 : 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 3.5 : 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 3.7: 1, silicon
  • the weight ratio of sodium to sodium hexametaphosphate is: 3.8: 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 3.9:1.
  • the weight ratio of coke, calcium chloride (CaC12) and lime in the calcining reducing agent used in the step 7 of the present invention may be variously combined:
  • the weight ratio of coke and calcium chloride (CaC12) to lime is: 33: 4: 25, coke, calcium chloride (CaC12) and stone
  • the weight ratio of ash is: 30: 3.5: 23
  • the weight ratio of coke, calcium chloride (CaC12) to lime is: 35: 4.5:
  • the weight ratio of coke, calcium chloride (CaC12) and lime is: 34: 4:26
  • the weight ratio of coke, calcium chloride (CaC12) and lime is: 32: 3.7: 27
  • the weight ratio of coke, calcium chloride (CaC12) and lime is: 31: 3.8: 24.
  • Step 4 of adding 2.9-3.5 kg of dispersant per ton of high-silicon high-alumina-containing hematite ore as described in step 1 can be variously combined: high silicon-containing high aluminum per ton as described in step 1.
  • 3.1kg of dispersant may also be added to the high-alumina hematite ore.
  • 3.2kg of dispersant may be added per ton of high-silica-high-alumina-bearing hematite as described in step 1, according to step 1.
  • Step 7 of adding 210-260 kg of calcining reducing agent per ton of high-silica-high-alumina-containing hematite ore as described in step 1 may have various combinations: high silicon-containing high aluminum per ton as described in step 1. Add 210kg of calcining reducing agent to the hematite ore, add 220kg of calcining reducing agent per ton of hematite ore containing high silicon and high alumina as described in step 1, according to the high silicon content per ton as described in step 1.

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Abstract

A process for extracting iron from high silicon alumohematite, comprising the following steps: (1) placing high silicon-aluminum hematite into an agitation tank for agitation with water to give an ore pulp; (2) subjecting the ore pulp to gravity separation to give the middlings and tailings; (3) placing the middling products from Step (2) into a ball mill for milling with water; (4) placing the resulted tailings and the resulted ore pulp into the agitation tank for uniform blend prior to addition of a dispersing agent; (5) feeding the ore pulp to an intensified magnetic separator for intensified magnetic separation to give the iron concentrate and tailings; (6) placing the tailings into a thickener to give the ore pulp; (7) placing the ore pulp into an agitator prior to addition of a calcination reducer to give an aggregate; (8) subjecting the aggregates to calcination, to give a reduced iron pellet product; (9) comminuting the iron pellet products; (10) subjecting the comminuted materials to magnetic separation, to give the iron concentrate product and milltailings, with the resulted iron concentrates being incorporated to give the iron concentrate product. The process for extracting the iron concentrates may provide an iron grade of more than 68％ and an iron recovery of more than 97％.

Description

说明书 Instruction manual
一种高硅铝赤铁矿提铁工艺  High-silicon-aluminum hematite iron extraction process
技术领域 Technical field
本发明涉及冶炼技术， 是一种高硅铝赤铁矿提铁工艺。  The invention relates to a smelting technology and is a high silicon-aluminum hematite iron lifting process.
背景技术 Background technique
含硅高含铝高的铁矿石由于选铁难度极大，生产成本高， 多年来一直被本领域认为是选 矿难题。 然而， 含硅高含铝高的铁矿石在我国广西等地储量很大， 虽然铁矿石价格较低，但 仍然无法充分利用。近年来随着铁矿石价值的不断上涨，使本领域技术人员的研究课题转向 储备大、 尚未充分利用的含高硅高铝铁矿石的选铁。根据已报道的资料可知， 对含高铝的铁 矿石或含高硅的铁矿石选矿技术有了一定突破， 使部分地区的贫铁矿得到了进一步利用。但 是，对含高硅高铝的赤铁矿选矿技术目前尚未突破，致使我国部分地区储量很大的含高硅高 铝的赤铁矿无法得到充分合理的利用。  Iron ore with high silicon and high aluminum content is difficult to select iron because of its high iron selection and high production cost. It has been considered as a problem of mineral processing in the field for many years. However, iron ore containing high silicon and high aluminum content has a large reserve in Guangxi and other places in China. Although the price of iron ore is low, it is still not fully utilized. In recent years, with the rising value of iron ore, the research topics of those skilled in the art have shifted to the iron storage of high-silica-high-aluminum iron ore with large reserves and underutilization. According to the reported data, there is a certain breakthrough in the ore dressing technology of high-aluminum-containing iron ore or high-silicon-containing iron ore, which has made the use of lean iron ore in some areas. However, the hematite beneficiation technology containing high silicon and high aluminum has not yet been broken, and the hematite containing high silicon and high alumina, which has a large reserve in some parts of China, cannot be fully and rationally utilized.
发明内容 Summary of the invention
本发明的目的是提供一种高硅铝赤铁矿提铁工艺， 它采用含高硅高铝的赤铁矿石为原 料， 通过本发明工艺提取铁精矿， 使铁品位大于 68%， 铁回收率大于 97%。  The object of the present invention is to provide a high silicon aluminum hematite iron extraction process, which uses hematite ore containing high silicon and high aluminum as raw materials, and extracts iron concentrate by the process of the invention, so that the iron grade is greater than 68%, iron The recovery rate is greater than 97%.
为实现上述目的， 本发明通过以下技术方案实现： 一种高硅铝赤铁矿提铁工艺， 包括如 下步骤：  In order to achieve the above object, the present invention is achieved by the following technical solutions: A high silicon aluminum hematite iron raising process, comprising the following steps:
①将含高硅高铝的赤铁矿石置入搅拌槽内加水搅拌成矿浆， 矿浆浓度为 15-25% ; 1 Put the high-silicon high-alumina hematite ore into the stirred tank and add water to stir the slurry into a slurry with a concentration of 15-25%.
②将矿浆置入螺旋溜槽内进行重选， 选出品位为 60%的铁精矿， 同时得到中矿和尾矿；2 The slurry is placed in a spiral chute for re-election, and an iron concentrate with a grade of 60% is selected, and a medium ore and tailings are obtained at the same time;
③将步骤②中得到的中矿产品置入球磨机内加水磨矿， 磨矿浓度为 70% ; 3 The medium ore product obtained in step 2 is placed in a ball mill to add water grinding, and the grinding concentration is 70%;
④将步骤②中得到的尾矿和步骤③中得到的矿浆置入搅拌槽内混匀后加入分散剂，进行 充分搅拌调浆后得到矿浆，分散剂由硅酸钠和六偏磷酸钠组成，硅酸钠与六偏磷酸钠的重量 比为 3-4: 1， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 2.9-3.5kg分散剂； 4, the tailings obtained in step 2 and the slurry obtained in step 3 are placed in a stirred tank and mixed, and then a dispersing agent is added, and the slurry is obtained by thoroughly stirring and slurrying, and the dispersing agent is composed of sodium silicate and sodium hexametaphosphate. The weight ratio of sodium silicate to sodium hexametaphosphate is 3-4: 1, and 2.9-3.5 kg of dispersant is added per ton of hematite ore containing high silicon and high alumina as described in step 1;
⑤将步骤④中的矿浆送入强磁机内进行强磁选，磁场强度为 0.8T,得到品位为 61.2%的 铁精矿和尾矿； 5 The slurry in step 4 is sent to a strong magnetic machine for strong magnetic separation, and the magnetic field strength is 0.8T, and an iron concentrate and tailings with a grade of 61.2% are obtained;
⑥将步骤⑤中的尾矿置入浓缩池进行浓缩， 得到浓度为 75%的矿浆；  6 The tailings in step 5 are placed in a concentration tank for concentration to obtain a slurry having a concentration of 75%;
⑦将浓度为 75%的矿浆置入搅拌机中， 同时加入焙烧还原剂， 搅拌均匀后置入造粒机 内造粒得到粒料，焙烧还原剂由焦炭、氯化钙和石灰组成，焦炭、氯化钙和石灰的重量比为： 30-35： 3.5-4.5： 23-28， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 210-260kg 焙烧还原剂；  7 Put the slurry with a concentration of 75% into the mixer, add the calcining reducing agent at the same time, stir evenly and then put it into the granulator to granulate to obtain the pellets. The calcining reducing agent is composed of coke, calcium chloride and lime, coke and chlorine. The weight ratio of calcium to lime is: 30-35: 3.5-4.5: 23-28, 210-260 kg of calcining reducing agent is added per ton of hematite ore containing high silicon high alumina as described in step 1;
⑧将粒料置入回转窑内进行还原焙烧， 焙烧最高温度为 1300°C， 各升温阶段为： 常温 升至 400°C， 保温 30分钟， 然后加热升温至 760 °C， 保温 30分钟， 再加热升至 950°C， 保 温 30分钟， 再加热至 1150°C， 保温 30分钟后再加热至 1300 °C， 保温 30分钟， 得到还原铁 球产品；  8 The pellets are placed in a rotary kiln for reduction roasting. The maximum temperature for calcination is 1300 °C. The heating period is: normal temperature rise to 400 °C, heat preservation for 30 minutes, then heat up to 760 °C, keep warm for 30 minutes, then Heating to 950 ° C, holding for 30 minutes, then heating to 1150 ° C, holding for 30 minutes, then heating to 1300 ° C, holding for 30 minutes, to obtain reduced iron ball products;
⑨将还原铁球产品置入辊压碎磨机内碎磨， 磨至物料细度 -0.074mm占 70%； 9 The reduced iron ball product is placed in a roller crusher and ground to a fineness of -0.074 mm; 70%;
⑩将碎磨后的物料置入弱磁选机内进行磁选， 磁场强度为 0.08T, 得到铁精矿产品和尾 砂； 将尾砂回收再利用； 10 The ground material is placed in a weak magnetic separator for magnetic separation, the magnetic field strength is 0.08T, and the iron concentrate product and tailings are obtained; the tailings are recycled and reused;
将步骤②、 步骤⑤和步骤⑩中得到铁精矿合并， 经浓缩脱水后， 得到铁精矿产品。 步骤 ④中所述的分散剂中硅酸钠与六偏磷酸钠的重量比为 3.5 : 1。步骤⑦中所述的焙烧还原剂中 焦炭、 氯化钙和石灰的重量比为 33 : 4： 25。  The iron concentrates obtained in steps 2, 5 and 10 are combined and dehydrated by concentration to obtain an iron concentrate product. The weight ratio of sodium silicate to sodium hexametaphosphate in the dispersant described in step 4 is 3.5:1. The weight ratio of coke, calcium chloride and lime in the calcining reducing agent described in the step 7 is 33:4:25.
本发明的提铁工艺以含高硅高铝的赤铁矿石为原料，经过整个工艺处理后， 能从高硅高 铝铁矿石中获得铁品位为 68.9%的铁精矿， 铁回收率达到 98.7%， 产率达到 79.2%， 铁精矿 中的二氧化硅含量为小于 3.1%， 三氧化二铝含量小于 2.9%， 尾砂中铁品位小于 39¾。 本发 明工艺突破了含高硅高铝赤铁矿石中铁难选的技术难题，为我国含高硅高铝赤铁矿的开采提 供了工业上利用的价值依据。按照投入产出计算， 每吨价格为 700元左右， 与已有的品位为 68%的铁精矿相比， 其价格大幅度降低， 可以大幅降低钢铁企业的生产成本， 能够缓解因铁 矿石需大量进口导致的售价大幅上升给钢铁企业带来的大幅提高生产成本的压力。本发明工 艺还具有易于操作， 生产安全性及稳定性高等优点。 The iron raising process of the invention adopts hematite ore containing high silicon and high aluminum as raw materials, and after the whole process, can obtain iron concentrate with iron grade of 68.9% from high silicon high alumina iron ore, iron recovery rate It reached 98.7%, the yield reached 79.2%, the silica content in the iron concentrate was less than 3.1%, the aluminum oxide content was less than 2.9%, and the iron grade in the tailings was less than 393⁄4. The process of the invention breaks through the technical difficulty of selecting iron in high silicon high alumina hematite ore, and provides for the mining of high silicon high alumina hematite in China. It provides a basis for the value of industrial use. According to the input-output calculation, the price per ton is about 700 yuan. Compared with the existing iron concentrate with a grade of 68%, the price is greatly reduced, which can greatly reduce the production cost of steel enterprises and alleviate the iron ore. The large increase in the price caused by the large number of imports has put pressure on steel companies to significantly increase production costs. The process of the invention also has the advantages of easy operation, high production safety and high stability.
具体实施方式 detailed description
实施例：  Example:
本发明所述的一种高硅铝赤铁矿提铁工艺， 包括如下步骤：  A high silicon aluminum hematite iron lifting process according to the present invention comprises the following steps:
①将含高硅高铝的赤铁矿石原料为含铁品位为 459¾-519¾、 含二氧化硅为 10.5-16.8%、 含三氧化三铝为 7-11.5%的赤铁矿石置入搅拌槽内加水搅拌成矿浆， 矿浆浓度为 15-25% ;  1 The hematite ore containing high silicon and high aluminum is placed in a stirred iron ore with a grade of 4593⁄4-5193⁄4, a silica content of 10.5-16.8%, and a yellow aluminum oxide of 7-11.5%. The tank is stirred with water to form a slurry, and the concentration of the slurry is 15-25%;
②将矿浆置入螺旋溜槽内进行重选， 选出品位为 60%的铁精矿， 同时得到中矿和尾矿； 2 The slurry is placed in a spiral chute for re-election, and an iron concentrate with a grade of 60% is selected, and a medium ore and tailings are obtained at the same time;
③将步骤②中得到的中矿产品置入球磨机内加水磨矿， 磨矿浓度为 70% ; 3 The medium ore product obtained in step 2 is placed in a ball mill to add water grinding, and the grinding concentration is 70%;
④将步骤②中得到的尾矿和步骤③中得到的矿浆置入搅拌槽内混匀后加入分散剂，进行 充分搅拌调浆后得到矿浆，分散剂由硅酸钠和六偏磷酸钠组成，硅酸钠与六偏磷酸钠的重量 比为 3-4 : 1， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 2.9-3.5kg分散剂， 优 选方案为： 每吨含高硅高铝的赤铁矿石内加入 3.1kg分散剂；  4, the tailings obtained in step 2 and the slurry obtained in step 3 are placed in a stirred tank and mixed, and then a dispersing agent is added, and the slurry is obtained by thoroughly stirring and slurrying, and the dispersing agent is composed of sodium silicate and sodium hexametaphosphate. The weight ratio of sodium silicate to sodium hexametaphosphate is 3-4: 1, and 2.9-3.5 kg of dispersant is added per ton of hematite ore containing high silicon and high alumina as described in step 1, the preferred scheme is: Add 3.1kg of dispersant per ton of hematite ore containing high silicon and high aluminum;
⑤将步骤④中的矿浆送入强磁机内进行强磁选，磁场强度为 0.8T,得到品位为 61.2%的 铁精矿和尾矿；  5 The slurry in step 4 is sent to a strong magnetic machine for strong magnetic separation, and the magnetic field strength is 0.8T, and an iron concentrate and tailings with a grade of 61.2% are obtained;
⑥将步骤⑤中的尾矿置入浓缩池进行浓缩， 得到浓度为 75%的矿浆；  6 The tailings in step 5 are placed in a concentration tank for concentration to obtain a slurry having a concentration of 75%;
⑦将浓度为 75%的矿浆置入搅拌机中， 同时加入焙烧还原剂， 搅拌均匀后置入造粒机 内造粒得到粒料，焙烧还原剂由焦炭、氯化钙和石灰组成，焦炭、氯化钙和石灰的重量比为： 30-35： 3.5-4.5： 23-28， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 210-260kg 焙烧还原剂， 优选方案是每吨含高硅高铝的赤铁矿石内加入 240kg焙烧还原剂；  7 Put the slurry with a concentration of 75% into the mixer, add the calcining reducing agent at the same time, stir evenly and then put it into the granulator to granulate to obtain the pellets. The calcining reducing agent is composed of coke, calcium chloride and lime, coke and chlorine. The weight ratio of calcium to lime is: 30-35: 3.5-4.5: 23-28, 210-260kg of calcining reducing agent is added per ton of hematite ore containing high silicon and high alumina as described in step 1. The scheme is to add 240 kg of calcining reducing agent per ton of hematite ore containing high silicon and high aluminum;
⑧将粒料置入回转窑内进行还原焙烧， 焙烧最高温度为 1300°C， 各升温阶段为： 常温 升至 400°C， 保温 30分钟， 然后加热升温至 760 °C， 保温 30分钟， 再加热升至 950°C， 保 温 30分钟， 再加热至 1150°C， 保温 30分钟后再加热至 1300 °C， 保温 30分钟， 得到还原铁 球产品；  8 The pellets are placed in a rotary kiln for reduction roasting. The maximum temperature for calcination is 1300 °C. The heating period is: normal temperature rise to 400 °C, heat preservation for 30 minutes, then heat up to 760 °C, keep warm for 30 minutes, then Heating to 950 ° C, holding for 30 minutes, then heating to 1150 ° C, holding for 30 minutes, then heating to 1300 ° C, holding for 30 minutes, to obtain reduced iron ball products;
⑨将还原铁球产品置入辊压碎磨机内碎磨， 磨至物料细度 -0.074mm占 70%； 9 The reduced iron ball product is placed in a roller crusher and ground to a fineness of -0.074 mm; 70%;
⑩将碎磨后的物料置入弱磁选机内进行磁选， 磁场强度为 0.08T, 得到铁精矿产品和尾 砂； 将尾砂回收再利用； 10 The ground material is placed in a weak magnetic separator for magnetic separation, the magnetic field strength is 0.08T, and the iron concentrate product and tailings are obtained; the tailings are recycled and reused;
将步骤②、 步骤⑤和步骤⑩中得到铁精矿合并， 经浓缩脱水后， 得到铁精矿产品， 产率 为 78.11%、 品位为 68.7%>， 回收率为 97.68%。  The iron concentrate obtained in steps 2, 5 and 10 is combined and dehydrated to obtain an iron concentrate product with a yield of 78.11% and a grade of 68.7%, and a recovery of 97.68%.
本发明工艺步骤④中所述的优选方案是：分散剂中硅酸钠与六偏磷酸钠的重量比为 3.5 : l o  The preferred embodiment described in the process step 4 of the present invention is that the weight ratio of sodium silicate to sodium hexametaphosphate in the dispersant is 3.5: l o
本发明工艺中进一步的方案是：步骤⑦中所述的焙烧还原剂中焦炭、氯化钙与石灰的重 量比为 33 : 4： 25。  A further aspect of the process of the present invention is that the weight ratio of coke, calcium chloride to lime in the calcining reducing agent described in step 7 is 33:4:25.
本发明工艺的步骤④中使用的分散剂， 硅酸钠与六偏磷酸钠的重量比有多种组合： 1、 硅酸钠与六偏磷酸钠的重量比为： 3 : 1， 硅酸钠与六偏磷酸钠的重量比为： 3.3 : 1、 硅酸钠与六偏磷酸钠的重量比为： 3.2: 1， 硅酸钠与六偏磷酸钠的重量比为： 4: 1， 硅酸钠 与六偏磷酸钠的重量比为： 3.6 : 1， 硅酸钠与六偏磷酸钠的重量比为： 3.5 : 1， 硅酸钠与六 偏磷酸钠的重量比为： 3.7: 1， 硅酸钠与六偏磷酸钠的重量比为： 3.8 : 1， 硅酸钠与六偏磷 酸钠的重量比为： 3.9: 1。  The dispersing agent used in the step 4 of the present invention has various combinations of the weight ratio of sodium silicate to sodium hexametaphosphate: 1. The weight ratio of sodium silicate to sodium hexametaphosphate is: 3: 1, sodium silicate The weight ratio with sodium hexametaphosphate is: 3.3: 1. The weight ratio of sodium silicate to sodium hexametaphosphate is: 3.2: 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 4: 1, silicic acid The weight ratio of sodium to sodium hexametaphosphate is: 3.6 : 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 3.5 : 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 3.7: 1, silicon The weight ratio of sodium to sodium hexametaphosphate is: 3.8: 1, the weight ratio of sodium silicate to sodium hexametaphosphate is: 3.9:1.
本发明步骤⑦中使用的焙烧还原剂中焦炭、 氯化钙 （CaC12) 和石灰的重量比可以有多 种组合：  The weight ratio of coke, calcium chloride (CaC12) and lime in the calcining reducing agent used in the step 7 of the present invention may be variously combined:
焦炭、 氯化钙 （CaC12) 与石灰的重量比为： 33 : 4： 25， 焦炭、 氯化钙 （CaC12) 和石 灰的重量比为： 30: 3.5： 23， 焦炭、 氯化钙 （CaC12 ) 与石灰的重量比为： 35 : 4.5： 28， 焦炭、 氯化钙 （CaC12) 和石灰的重量比为： 34: 4： 26， 焦炭、 氯化钙 （CaC12) 和石灰的 重量比为： 32: 3.7： 27， 焦炭、 氯化钙 （CaC12) 和石灰的重量比为： 31 : 3.8： 24。 The weight ratio of coke and calcium chloride (CaC12) to lime is: 33: 4: 25, coke, calcium chloride (CaC12) and stone The weight ratio of ash is: 30: 3.5: 23, the weight ratio of coke, calcium chloride (CaC12) to lime is: 35: 4.5: 28, the weight ratio of coke, calcium chloride (CaC12) and lime is: 34: 4:26, the weight ratio of coke, calcium chloride (CaC12) and lime is: 32: 3.7: 27, the weight ratio of coke, calcium chloride (CaC12) and lime is: 31: 3.8: 24.
步骤④的按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 2.9-3.5kg分散剂可以 有多种组合： 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 2.9kg分散剂， 按照步 骤①中所述的每吨含高硅高铝的赤铁矿石内加入 3.0kg分散剂， 按照步骤①中所述的每吨含 高硅高铝的赤铁矿石内也可以加入 3.1kg的分散剂， 按照步骤①中所述的每吨含高硅高铝的 赤铁矿石内也可以加入 3.2kg的分散剂， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内 加入 3.3kg分散剂， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内也可以加入 3.4kg的 分散剂， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 3.5kg的分散剂。  Step 4 of adding 2.9-3.5 kg of dispersant per ton of high-silicon high-alumina-containing hematite ore as described in step 1 can be variously combined: high silicon-containing high aluminum per ton as described in step 1. Add 2.9kg of dispersant to the hematite ore, add 3.0kg of dispersant per ton of high-silica-high alumina-containing hematite ore as described in step 1, according to the high silicon content per ton as described in step 1. 3.1kg of dispersant may also be added to the high-alumina hematite ore. 3.2kg of dispersant may be added per ton of high-silica-high-alumina-bearing hematite as described in step 1, according to step 1. 3.3kg of dispersant is added per ton of hematite ore containing high silicon and high alumina, and 3.4kg of dispersant may be added per ton of hematite ore containing high silicon and high alumina as described in step 1. Add 3.5 kg of dispersant per ton of high-silica-high alumina-containing hematite ore as described in step 1.
步骤⑦的按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 210-260kg焙烧还原 剂可以有多种组合：按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 210kg焙烧还原 剂，按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 220kg焙烧还原剂，按照步骤① 中所述的每吨含高硅高铝的赤铁矿石内加入 230kg焙烧还原剂，按照步骤①中所述的每吨含 高硅高铝的赤铁矿石内加入 240kg焙烧还原剂，按照步骤①中所述的每吨含高硅高铝的赤铁 矿石内加入 250kg焙烧还原剂， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 260kg焙烧还原剂。  Step 7 of adding 210-260 kg of calcining reducing agent per ton of high-silica-high-alumina-containing hematite ore as described in step 1 may have various combinations: high silicon-containing high aluminum per ton as described in step 1. Add 210kg of calcining reducing agent to the hematite ore, add 220kg of calcining reducing agent per ton of hematite ore containing high silicon and high alumina as described in step 1, according to the high silicon content per ton as described in step 1. Add 230kg of calcining reducing agent to the high-alumina hematite ore, add 240kg of calcining reducing agent per ton of high-silica-high-alumina-containing hematite ore as described in step 1, according to the per ton as described in step 1. 250 kg of calcined reducing agent was added to the high silicon high alumina hematite ore, and 260 kg of calcining reducing agent was added per ton of high silicon high alumina containing hematite ore as described in step 1.
本发明工艺中使用的所有设备均为公知设备。  All of the equipment used in the process of the invention are well known devices.

Claims

权利要求书 Claim
1、 一种高硅铝赤铁矿提铁工艺， 其特征在于： 包括如下步骤： 1. A high silicon aluminum hematite iron extraction process, characterized in that: the following steps are included:
①将含高硅高铝的赤铁矿石置入搅拌槽内加水搅拌成矿浆， 矿浆浓度为 15-25% ; 1 Put the high-silicon high-alumina hematite ore into the stirred tank and add water to stir the slurry into a slurry with a concentration of 15-25%.
②将矿浆置入螺旋溜槽内进行重选， 选出品位为 60%的铁精矿， 同时得到中矿和尾矿；2 The slurry is placed in a spiral chute for re-election, and an iron concentrate with a grade of 60% is selected, and a medium ore and tailings are obtained at the same time;
③将步骤②中得到的中矿产品置入球磨机内加水磨矿， 磨矿浓度为 70% ; 3 The medium ore product obtained in step 2 is placed in a ball mill to add water grinding, and the grinding concentration is 70%;
④将步骤②中得到的尾矿和步骤③中得到的矿浆置入搅拌槽内混匀后加入分散剂，进行 充分搅拌调浆后得到矿浆，分散剂由硅酸钠和六偏磷酸钠组成，硅酸钠与六偏磷酸钠的重量 比为 3-4: 1， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 2.9-3.5kg分散剂； 4, the tailings obtained in step 2 and the slurry obtained in step 3 are placed in a stirred tank and mixed, and then a dispersing agent is added, and the slurry is obtained by thoroughly stirring and slurrying, and the dispersing agent is composed of sodium silicate and sodium hexametaphosphate. The weight ratio of sodium silicate to sodium hexametaphosphate is 3-4: 1, and 2.9-3.5 kg of dispersant is added per ton of hematite ore containing high silicon and high alumina as described in step 1;
⑤将步骤④中的矿浆送入强磁机内进行强磁选，磁场强度为 0.8T,得到品位为 61.2%的 铁精矿和尾矿； 5 The slurry in step 4 is sent to a strong magnetic machine for strong magnetic separation, and the magnetic field strength is 0.8T, and an iron concentrate and tailings with a grade of 61.2% are obtained;
⑥将步骤⑤中的尾矿置入浓缩池进行浓缩， 得到浓度为 75%的矿浆；  6 The tailings in step 5 are placed in a concentration tank for concentration to obtain a slurry having a concentration of 75%;
⑦将浓度为 75%的矿浆置入搅拌机中， 同时加入焙烧还原剂， 搅拌均匀后置入造粒机 内造粒得到粒料，焙烧还原剂由焦炭、氯化钙和石灰组成，焦炭、氯化钙和石灰的重量比为： 30-35： 3.5-4.5： 23-28， 按照步骤①中所述的每吨含高硅高铝的赤铁矿石内加入 210-260kg 焙烧还原剂；  7 Put the slurry with a concentration of 75% into the mixer, add the calcining reducing agent at the same time, stir evenly and then put it into the granulator to granulate to obtain the pellets. The calcining reducing agent is composed of coke, calcium chloride and lime, coke and chlorine. The weight ratio of calcium to lime is: 30-35: 3.5-4.5: 23-28, 210-260 kg of calcining reducing agent is added per ton of hematite ore containing high silicon high alumina as described in step 1;
⑧将粒料置入回转窑内进行还原焙烧， 焙烧最高温度为 1300°C， 各升温阶段为： 常温 升至 400°C， 保温 30分钟， 然后加热升温至 760 °C， 保温 30分钟， 再加热升至 950°C， 保 温 30分钟， 再加热至 1150°C， 保温 30分钟后再加热至 1300 °C， 保温 30分钟， 得到还原铁 球产品；  8 The pellets are placed in a rotary kiln for reduction roasting. The maximum temperature for calcination is 1300 °C. The heating period is: normal temperature rise to 400 °C, heat preservation for 30 minutes, then heat up to 760 °C, keep warm for 30 minutes, then Heating to 950 ° C, holding for 30 minutes, then heating to 1150 ° C, holding for 30 minutes, then heating to 1300 ° C, holding for 30 minutes, to obtain reduced iron ball products;
⑨将还原铁球产品置入辊压碎磨机内碎磨， 磨至物料细度 -0.074mm占 70%； 9 The reduced iron ball product is placed in a roller crusher and ground to a fineness of -0.074 mm; 70%;
⑩将碎磨后的物料置入弱磁选机内进行磁选， 磁场强度为 0.08T, 得到铁精矿产品和尾 砂； 将尾砂回收再利用； 10 The ground material is placed in a weak magnetic separator for magnetic separation, the magnetic field strength is 0.08T, and the iron concentrate product and tailings are obtained; the tailings are recycled and reused;
将步骤②、 步骤⑤和步骤⑩中得到铁精矿合并， 经浓缩脱水后， 得到铁精矿产品。 The iron concentrates obtained in steps 2, 5 and 10 are combined and dehydrated by concentration to obtain an iron concentrate product.
2、 根据权利要求 1所述的一种高硅铝赤铁矿提铁工艺， 其特征在于： 步骤④中所述的 分散剂中硅酸钠与六偏磷酸钠的重量比为 3.5 : 1。 2. The high silicon aluminum hematite iron raising process according to claim 1, wherein the weight ratio of sodium silicate to sodium hexametaphosphate in the dispersing agent in step 4 is 3.5:1.
3、 根据权利要求 1所述的一种高硅铝赤铁矿提铁工艺， 其特征在于： 步骤⑦中所述的焙烧 还原剂中焦炭、 氯化钙和石灰的重量比为 33 : 4： 25。  3. The high silicon aluminum hematite iron raising process according to claim 1, wherein: the weight ratio of coke, calcium chloride and lime in the calcining reducing agent in step 7 is 33:4: 25.
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CN101487068A (en) * 2009-03-03 2009-07-22 北京科技大学 Technological process for directly producing spongy iron from high-phosphor oolitic hematite
CN101862703A (en) * 2010-05-17 2010-10-20 昆明理工大学 Separation-smelting combined method for producing iron ore concentrate from oolitic lean hematite

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