Bauxite comprehensive utilization method

A technology of bauxite and aluminum concentrate, applied in the direction of alkaline earth metal silicate, improvement of process efficiency, alumina/aluminum hydroxide, etc., can solve problems such as complex process flow, achieve high economic and environmental benefits, reduce Effect of alkali consumption and reduction of stockpiles

Inactive Publication Date: 2014-11-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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Embodiment 1

[0053] Al in bauxite 1 2 o 3 Content is 41.20%, SiO 2 The iron oxide content is 9.18%, and the iron oxide content is 30%. The bauxite 1 is crushed and coarsely ground to obtain a coarse ore powder with a thickness of less than 2.5 mm. The coarse ore powder was roasted in a fluidized roaster for 65 minutes in a reducing atmosphere to obtain roasted coarse ore powder. The roasting temperature was 800°C, and the CO content in the roaster was controlled to be 2.5%. The roasted coarse ore powder is finely ground with a ball mill until the content of the -75 μm particle size is 75%, and then subjected to magnetic separation treatment to obtain an iron concentrate with an iron content of 62%. The aluminum concentrate obtained by magnetic separation and iron removal is desiliconized with high-fraction lye to obtain desiliconized aluminum concentrate and sodium silicate lye. L, the molecular ratio is 40, the liquid-solid ratio is 3.0, and the reaction time is 180 minutes. The alumin...

Embodiment 2

[0055] Al in bauxite 1 2 o 3 Content is 41.20%, SiO 2 The iron oxide content is 9.18%, and the iron oxide content is 30%. The bauxite 1 is crushed and finely ground to obtain a fine ore powder with a particle size content of -0.3mm of 100% and a particle size content of -75μm of 65%. The fine ore powder was roasted in a fluidized roaster for 5s under a reducing atmosphere at a temperature of 1100°C, and the CO content in the roaster was controlled to be 1.5%. The roasted fine ore powder is processed by magnetic separation to obtain iron concentrate and aluminum concentrate with an iron content of 52%; Sodium acid lye, the temperature of desiliconization treatment is 105°C, the caustic concentration Nk is 150g / L, the molecular ratio is 50, the liquid-solid ratio is 5.0, and the reaction time is 10min. The aluminum recovery rate is 82%. The temperature of the sodium silicate-containing lye is 105°C, the amount of lime added is 1.4 times the theoretical amount, the reaction t...

Embodiment 3

[0057] Al in bauxite 1 2 o 3 Content is 41.20%, SiO 2 The iron oxide content is 9.18%, and the iron oxide content is 30%. The bauxite 1 is crushed and coarsely ground to obtain a coarse ore powder with a thickness of less than 1.5 mm. The coarse ore powder was roasted in a fluidized roaster for 30 minutes in a reducing atmosphere to obtain roasted coarse ore powder. The roasting temperature was 950°C, and the CO content in the roaster was controlled at 2.8%. The roasted coarse ore powder is finely ground with a ball mill until the content of -75 μm particle size is 85%, and the iron concentrate and aluminum concentrate with an iron content of 56% are obtained by magnetic separation. The aluminum concentrate is desiliconized with a high-fraction lye to obtain a desiliconized aluminum concentrate and a lye containing sodium silicate. The temperature of the desiliconization treatment is 105°C, the caustic concentration Nk is 150g / L, and the molecular ratio is 40. The liquid-so...

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Abstract

The invention discloses a bauxite comprehensive utilization method, relates to an alumina production method and iron-containing mineral utilization and especially relates to a low-grade high-iron bauxite comprehensive utilization method. The bauxite comprehensive utilization method comprises the following steps of 1, grinding bauxite into mineral powder, 2, roasting the mineral powder in a reduction atmosphere, 3, carrying out magnetic separation on the roasted mineral powder to obtain iron concentrate and aluminum concentrate, 4, carrying out desilicication treatment on the aluminum concentrate by an alkali liquid to obtain silicon-free aluminum concentrate and a sodium silicate-containing alkali liquid, 5, adding lime into the sodium silicate-containing alkali liquid, carrying out regeneration treatment, carrying out solid-liquid separation and recycling the regenerated alkali liquid, washing the silicon-free dregs by water, and drying the silicon-free dregs to obtain a wollastonite product, and 6, dissolving the silicon-free aluminum concentrate by a Bayer process so that alumina is produced. The bauxite comprehensive utilization method greatly reduces alkali loss of alumina production. Wollastonite as a silicon-removal by-product and iron concentrate obtained by magnetic separation iron-removal can be sold as products and thus high economic and environmental benefits are obtained.

Description

technical field [0001] A comprehensive utilization method of bauxite relates to an alumina production method and utilization of iron-containing minerals, in particular to a comprehensive utilization method of low-grade high-iron bauxite. Background technique [0002] With the development of my country's alumina industry in recent years, there are fewer and fewer high-quality bauxite raw materials in various parts of our country. There are considerable reserves of low-grade high-iron bauxite in Guangxi, Yunnan, Guizhou and other places in my country. It is not economical for this kind of bauxite to be directly used for the production of alumina or direct ironmaking. At present, there is still a lack of technically and economically feasible technology for the comprehensive utilization of low-grade high-iron bauxite. [0003] Patent CN201310262289.X (Chen Xiangqing, etc.) relates to a comprehensive treatment method and device for high-iron bauxite. Its main technical route is ...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/24C22B1/02
CPCY02P10/20
Inventor 尹中林齐利娟武国宝
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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