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High iron bauxite flotation silicon removal-deep reduction smelting method

A high-iron bauxite and flotation technology, which is applied in flotation, process efficiency improvement, solid separation, etc., can solve the problems of increasing the amount of solid waste red mud and reducing the production capacity of a single machine, so as to save energy and improve the quality of molten iron Quality, cost-saving effect

Inactive Publication Date: 2019-11-15
辽宁东大矿冶工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of producing alumina by the traditional Bayer method, due to the high iron content of high-iron bauxite, the stand-alone production capacity of the equipment is reduced, and the amount of hazardous solid waste red mud increases significantly

Method used

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  • High iron bauxite flotation silicon removal-deep reduction smelting method

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Effect test

Embodiment 1

[0031] A certain high-iron bauxite that present embodiment adopts contains TFe 26.84% by weight percentage, Al 2 o 3 36.28%, SiO 2 10.06%, it is subjected to flotation desiliconization-deep reduction smelting, such as figure 1 shown, follow the steps below:

[0032] (1) First, crush the high-iron bauxite, grind the ore until the particle size of -0.074mm accounts for 70% of the mass, and use cationic reverse flotation technology, first coarse, second fine, and second sweep process, and perform pre-desilication treatment, of which Dodecylamine was used as collector, sodium hexametaphosphate was used as inhibitor, sulfuric acid was used to adjust the pH, and the pH was 5.5; 2 The quality score is 3%;

[0033] (2) The aluminum-iron concentrate after pre-desiliconization is mixed with a certain proportion of coal powder and lime, then added to the rotary kiln, and reduced and roasted at 1150°C to reduce part of the iron oxides to metallic iron; the amount of lime added is n(...

Embodiment 2

[0038] In this embodiment, a certain high-iron red mud containing TFe 28.57% by weight percentage, Al 2 o 3 35.48%, SiO 2 11.06%, pre-desilication-deep reduction smelting method is the same as embodiment 1, the difference is:

[0039] (1) SiO in concentrate after pre-desiliconization 2 The mass fraction is 4.04%;

[0040] (2) The reduction roasting temperature of the pre-desiliconized ore concentrate rotary kiln is 1050°C, and the amount of lime added is n(CaO) / n(Al 2 o 3 )=1.79; the amount of pulverized coal added is that the carbon ratio is 0.9; the metallization rate of iron after reducing and roasting the pre-desiliconized ore concentrate is 78%;

[0041] (3) The reduction temperature of the deep reduction furnace is 1450°C; the molten iron contains Fe 93.03%, C 3.52%, P 0.04%, S 0.01%, Si 0.33% by mass percentage;

[0042] (4) The concentration of sodium carbonate solution used for leaching is 100g / L, the leaching temperature is 85°C, the leaching time is 90 minutes,...

Embodiment 3

[0045] This embodiment adopts a certain high-iron bauxite containing TFe 27.85% by weight percentage, Al 2 o 3 36.27%, SiO 2 10.57%, method is the same as embodiment 1, and difference is:

[0046] (1) SiO in concentrate after pre-desiliconization 2 The mass fraction is 3.45%;

[0047] (2) The reduction roasting temperature of the pre-desiliconized ore concentrate rotary kiln is 1200°C, and the amount of lime added is n(CaO) / n(Al 2 o 3 )=1.80; the amount of pulverized coal added is that the carbon ratio is 1; the metallization rate of iron after reduction and roasting of the pre-desiliconized ore concentrate is 76%;

[0048] (3) The reduction temperature of the deep reduction furnace is 1420°C; the molten iron contains 92.67% Fe, 3.80% C, 0.03% P, 0.02% S, and 0.35% Si by mass percentage;

[0049] (4) The concentration of sodium carbonate solution used for leaching is 105g / L, the leaching temperature is 95°C, the leaching time is 88 minutes, the liquid-solid ratio is 8:1...

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Abstract

The invention discloses a high iron bauxite flotation silicon removal-deep reduction smelting method. The high iron bauxite flotation silicon removal-deep reduction smelting method includes: first performing smashing and ore grinding on high iron bauxite, then using the cation reverse flotation technology for performing silicon removal treatment on the high iron bauxite, and then performing prereduction roasting and deep reduction, and finally effectively recycling iron and aluminum in the high iron bauxite. By using the high iron bauxite flotation silicon removal-deep reduction smelting method, recovery rate of the iron is larger than 95%, and leaching rate of aluminum oxide is larger than 85%.

Description

technical field [0001] The invention relates to the technical fields of mineral processing and metallurgy, in particular to a method for flotation desilication-deep reduction smelting of high-iron bauxite. Background technique [0002] my country is the world's largest steel producer and consumer, as well as the world's largest aluminum producer and consumer. With the rapid economic development, my country's demand for iron and aluminum is increasing, resulting in a high degree of dependence on foreign iron ore and bauxite in my country. As the rich ore resources that can be exploited worldwide are gradually decreasing, increasing the development and utilization of domestic complex iron-aluminum composite ores is of great significance to solve the bottleneck problem of iron resources and aluminum resources. [0003] There are a large amount of high-iron bauxite reserves in Guangxi. Among them, the proven gibbsite-type bauxite reserves in Guigang, Binyang and Hengxian in cen...

Claims

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Application Information

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IPC IPC(8): C22B1/02C21B13/14C22B7/04C22B21/00B03D1/018B03D101/02B03D101/06B03D103/02
CPCB03D1/018B03D2201/02B03D2201/06B03D2203/02C21B13/0006C21B13/0066C21B13/14C22B1/02C22B7/006C22B7/04C22B21/0023Y02P10/20
Inventor 韩跃新高海啸余建文李艳军吕扬
Owner 辽宁东大矿冶工程技术有限公司
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