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Method for recovering iron from high-iron bauxite, and method for extracting aluminum from high-iron bauxite

A technology for high-iron bauxite and iron recovery, applied in chemical instruments and methods, aluminum sulfate, aluminum compounds, etc., can solve problems such as low iron oxide mass fraction, lower alumina dissolution rate, and affect blast furnace operation, etc., to improve Reduction conversion efficiency, low cost, and the effect of avoiding air pollution

Inactive Publication Date: 2020-02-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is directly used to produce alumina, not only the aluminum-silicon ratio of bauxite does not meet the production requirements, but the goethite in bauxite can also reduce the dissolution rate of alumina; The mass fraction of iron is not high, and the alumina in it will also affect the operation of the blast furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The total iron content in the high iron gibbsite type bauxite used is 25.6%, Al 2 o 3 The content is 50.7%.

[0040] Step S1, put 1000g of high-iron gibbsite-type bauxite ore powder with a particle size below 200 mesh in a closed shaft furnace, and pass in flare gas from the lower part of the shaft furnace, and reduce at 1150°C for 180 minutes, and the reduction is completed Then continue to feed the torch gas until the temperature in the shaft furnace drops to room temperature to obtain the reduced raw material.

[0041] Step S2. Grinding the reduced raw materials to below 200 meshes, performing magnetic separation under a magnetic field strength of 20KA / m to obtain magnetic separation concentrates and magnetic separation tailings; the magnetic separation concentrates are iron concentrates, and the magnetic separation tailings are Alumina enrichment ore.

[0042] Step S3. According to the molar ratio of alumina and ammonium sulfate in the magnetic separation tailing...

Embodiment 2

[0046] The total iron content in the high iron diaspore type bauxite used is 29.8%, Al 2 o 3 The content is 48.6%.

[0047] Step S1, put 1000g of high-iron diaspore bauxite ore powder with a particle size below 200 mesh in a closed shaft furnace, and pass the torch gas from the lower part of the shaft furnace, and reduce it at 1200°C for 150 minutes, and reduce After the end, continue to feed the torch gas until the temperature in the shaft furnace drops to room temperature to obtain the reduced raw material.

[0048] Step S2. Grinding the reduced raw materials to below 200 meshes, performing magnetic separation under a magnetic field strength of 20KA / m to obtain magnetic separation concentrates and magnetic separation tailings; the magnetic separation concentrates are iron concentrates, and the magnetic separation tailings are Alumina enrichment ore.

[0049] Step S3. According to the molar ratio of alumina and ammonium sulfate in the magnetic separation tailings is 1:6, the...

Embodiment 3

[0053] The total iron content in the high iron gibbsite type bauxite used is 35.5%, Al 2 o 3 The content is 53.5%.

[0054] Step S1, put 1000g of high-iron gibbsite-type bauxite ore powder with a particle size below 200 mesh in a closed shaft furnace, and pass in flare gas from the lower part of the shaft furnace, and reduce at 1100°C for 120 minutes, and the reduction is completed Then continue to feed the torch gas until the temperature in the shaft furnace drops to room temperature to obtain the reduced raw material.

[0055] Step S2. Grinding the reduced raw materials to below 200 meshes, performing magnetic separation under a magnetic field strength of 20KA / m to obtain magnetic separation concentrates and magnetic separation tailings; the magnetic separation concentrates are iron concentrates, and the magnetic separation tailings are Alumina enrichment ore.

[0056] Step S3. According to the molar ratio of alumina and ammonium sulfate in the magnetic separation tailing...

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Abstract

The invention provides a method for recovering iron from high-iron bauxite. The method comprises the steps that S1, high-iron bauxite powder is placed in a closed reduction furnace, flare gas is introduced into the reduction furnace, heating reduction is conducted, and reduction materials are obtained; and S2, the reduction materials are ground and then subjected to magnetic separation, thus magnetic separation concentrate and magnetic separation tailings are obtained, the magnetic separation concentrate is iron concentrate, and the magnetic separation tailings are aluminum oxide enrichment ores. The iron in the high-iron bauxite can be recovered, meanwhile, the flare gas is utilized, and atmospheric pollution generated by flare gas burning of petrochemical enterprises is avoided. The invention further provides a method for extracting aluminum from the high-iron bauxite. The method comprises the steps that A1, the high-iron bauxite is treated through the method for recovering the ironfrom the high-iron bauxite, and thus magnetic separation concentrate and magnetic separation tailings are obtained; A2, the magnetic separation tailings, ammonium sulfate and water are evenly mixed and then roasted to obtain roasted clinker; and A3, the roasted clinker is dissolved out and separated to obtain an aluminum-containing solution and aluminum-extracting slag. Iron, the aluminum and silicon in the magnetic separation tailings are separated, and the purpose of comprehensive utilization of the high-iron bauxite is achieved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and metallurgy, and in particular relates to a method for recovering iron by utilizing high-iron bauxite and a method for extracting aluminum by utilizing high-iron bauxite. Background technique [0002] High-iron bauxite actually means that the total iron content is more than 20%, and it also contains iron-bearing minerals such as hematite, magnetite, limonite, etc. A general term for aluminum-containing mineral ores such as bauxite. my country has a large number of high-iron bauxite resources, including high-iron bauxite in Pingguo, Guangxi, whose alumina phase is mainly diaspore; high-iron bauxite in Guigang, Binyang, Hengxian and Fujian in Guangxi, The alumina phase is mainly gibbsite. This part of high-iron bauxite is characterized by high iron, with a mass fraction of total iron of more than 20%, while the mass fraction of alumina is low, and the ratio of aluminum to silicon is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C22B1/06C22B21/00C01F7/76
CPCC01F7/765C21B13/0073C21B13/02C22B1/06C22B21/0007C22B21/0015Y02P10/20
Inventor 吴艳白皓何东昌刘梦李在元
Owner NORTHEASTERN UNIV
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