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System and method for treating high-iron bauxite

A high-iron bauxite and pretreatment unit technology, applied in grain processing, etc., can solve problems such as high energy consumption, reduced stand-alone yield, and environmental pollution, and achieve low reaction temperature, reduced production costs, and low energy consumption for process technology Effect

Pending Publication Date: 2017-07-07
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the high-iron bauxite is directly put into the Bayer process, a large amount of red mud will be produced, which will lead to the disadvantages of lower unit yield, excessive energy consumption, and environmental pollution. How to reduce the iron content in the high-iron bauxite before the Bayer process Reduction has become an urgent problem to be solved in the utilization of high-iron bauxite

Method used

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  • System and method for treating high-iron bauxite
  • System and method for treating high-iron bauxite
  • System and method for treating high-iron bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The composition of the high-iron bauxite used in this example is shown in Table 1.1.

[0065] 1.1 Main chemical composition of high iron bauxite 1 (wt%)

[0066] Element TF CaO MgO Content / wt100% 25.84 36.26 10.96 7.46 4.94 0.16 2.52 0.167

[0067] After the high-iron bauxite is dried, crushed and finely ground, the finely ground particle size is less than 100 mesh, which accounts for 95% of the total raw materials. The preheating furnace is preheated to 850°C, and Ender furnace gas (62%H 2 , 8.6% CO, 2% CO 2 , 27.4%N 2 ) to reduce the high-iron bauxite, the reduction temperature is about 850°C, and the reaction time is 100min. The reduced high-iron bauxite powder is finely ground to less than 200 mesh, and then separated by magnetic separation. The composition of the obtained metallic iron powder is shown in Table 1.2 and the composition of the aluminum-rich slag is shown in Table 1.3.

[0068] Table 1.2 Main components of...

Embodiment 2

[0074] The composition of the high-iron bauxite used in this example is shown in Table 2.1.

[0075] Table 2.1 Main chemical composition of high iron bauxite 2 (wt%)

[0076] Element TF CaO MgO Content / wt100% 22.64 41.28 9.93 8.26 4.32 1.2 1.45 0.11

[0077] After the high-iron bauxite is dried, crushed and finely ground, the finely ground particle size is less than 100 mesh, which accounts for 95% of the total raw materials. The preheating furnace is preheated to 800°C, and coke oven gas (45.8% CO+ 48.2%H 2 +2.3%CO 2 +3.7%N 2 ) to reduce the high-iron bauxite, the reduction temperature is about 900° C., and the reaction time is 60 minutes. The reduced high-iron bauxite powder is finely ground to less than 200 mesh, and then separated by magnetic separation. The composition of the obtained metallic iron powder is shown in Table 2.2 and the composition of the aluminum-rich slag is shown in Table 2.3.

[0078] Table 2.2 Main compon...

Embodiment 3

[0083] The composition of high iron bauxite used in this example is shown in Table 3.1.

[0084] Table 3.1 Main chemical composition of high iron bauxite 3 (wt%)

[0085] Element TF CaO MgO Content / wt100% 23.47 39.26 11.63 6.68 5.14 0.18 1.35 0.18

[0086] After the high-iron bauxite is dried, crushed and finely ground, the finely ground particle size is less than 100 mesh, which accounts for 95% of the total raw materials. The preheating furnace is preheated to 750°C, and Ende furnace gas (35.1% CO+ 41.4%H 2 +2.3%CO 2 +21.2%N 2 ) to reduce the high-iron bauxite, the reduction temperature is about 1050° C., and the reaction time is 30 minutes. The reduced high-iron bauxite powder is finely ground to less than 100 mesh, and then separated by magnetic separation. The composition of the obtained metallic iron powder is shown in Table 3.2 and enriched

[0087] The composition of aluminum slag is shown in Table 3.3.

[0088] Table 3....

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Abstract

The invention relates to a system and method for processing high-iron bauxite. The system includes a pretreatment unit, a reduction unit and a fine grinding separation unit. The pretreatment unit includes the inlet of high-iron bauxite raw ore, the outlet of preheated high-iron bauxite powder; the reduction unit includes a fluidized bed, and the fluidized bed includes the inlet of preheated high-iron bauxite powder, the inlet of reducing gas, the metallization The high-iron bauxite outlet, the reducing gas inlet is arranged at the lower part of the fluidized bed; the fine grinding separation unit includes a metallized high-iron bauxite inlet, a metal iron powder outlet, and an aluminum-rich slag outlet, and the metallized The high-iron bauxite inlet is connected to the metallized high-iron bauxite outlet. The aluminum-rich slag obtained by the system and method can be used as a raw material for producing alumina, and the metallic iron powder can be used as a raw material for steelmaking, and finally achieves the effects of reducing harmful components of metallic iron, reducing energy consumption and production costs, and simplifying the process.

Description

technical field [0001] The invention relates to the field of gas-based direct reduction to produce metallic iron, in particular to a system and method for processing high-iron bauxite. Background technique [0002] Bauxite is currently the most important raw material in the production of alumina, and more than 90% of alumina is produced with bauxite as raw material. Bauxite resources are very rich in the world. According to the statistics of the U.S. Bureau of Mines, the world’s bauxite reserves are 26.8 billion tons. Bauxite resources are widely distributed but relatively concentrated. They are distributed on all continents, but they are mainly distributed in Guinea. , Brazil, India, Australia and China. Most foreign bauxite is gibbsite type, high-quality bauxite with high aluminum-silicon ratio. [0003] my country is a country with relatively poor bauxite resources. The per capita reserves of bauxite are only equivalent to 7.3% of the world's average level. Moreover, my...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/00C22B5/12C21B13/00C22B21/00B22F9/22B02C21/00B02C23/08
CPCC22B1/02B02C21/00B02C23/08B22F9/22C21B13/006C22B1/00C22B5/12C22B21/0007
Inventor 陈士朝边妙莲孙辉马冬阳曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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