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Method for producing alumina from low-grade bauxite

A bauxite and alumina technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of poor product quality, large construction investment, long production process, etc. The effect of low consumption and improved utilization

Inactive Publication Date: 2017-03-22
洛阳国兴矿业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

99% of the proven bauxite in my country is diaspore bauxite, which is characterized by hard grinding, insoluble, high silicon, and low aluminum-silicon ratio. At present, bauxite in my country is mainly used to produce alumina , mainly based on the hybrid production process, the production process is long, the energy consumption is high, the construction investment is large, and the product quality is poor

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  • Method for producing alumina from low-grade bauxite
  • Method for producing alumina from low-grade bauxite
  • Method for producing alumina from low-grade bauxite

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Embodiment 11

[0043] In the method for producing alumina by utilizing low-grade bauxite provided by the present invention, the embodiment 1.1 of step one chemical flotation desiliconization step comprises the following steps:

[0044] Provide low-grade bauxite raw ore as shown in Table 1.1, and place it in a crusher for crushing, and then place the crushed low-grade bauxite in a grinder for grinding to obtain low-grade bauxite with a particle size of 100 mesh Bauxite particles: take 10.00 g of the 100-mesh low-grade bauxite particles and place them in a fluidized bed reactor, and pass hydrogen fluoride gas into the fluidized bed reactor at 110 ° C for 30 minutes to obtain desorbed Silicon solid residue: Wash and filter the desiliconized solid residue with hot water at 80°C to obtain 6.969 g of high-grade bauxite product. X-ray fluorescence analysis method is used to analyze and know: SiO in high-grade bauxite products 2 content of 0.18%, the removal rate of silicon is 99.61%, the content o...

Embodiment 12

[0048] The difference between Example 1.2 and Example 1.1 of the chemical flotation desiliconization step provided by the present invention is that the reaction temperature of the low-grade bauxite particles and hydrogen fluoride gas is 70° C., and the desiliconization solid residue is obtained after 15 minutes of reaction. And sequentially wash and dry the desiliconized solid residue with 85° C. water to obtain 5.400 g of high-grade bauxite product. X-ray fluorescence analysis method is used to analyze and know: SiO in high-grade bauxite products 2 content of 1.41%, the removal rate of silicon is 97.65%, the content of fluorine is 23.41%, Al 2 o 3 The content is 68.53%.

Embodiment 13

[0050] The difference between Example 1.3 and Example 1.1 of the chemical flotation desiliconization step provided by the present invention is that the reaction temperature of the low-grade bauxite particles and hydrogen fluoride gas is 20°C, and the desiliconization solid residue is obtained after 20 minutes of reaction , the desiliconization solid residue was successively washed with water at 90°C and dried to obtain 5.410 g of high-grade bauxite product. X-ray fluorescence analysis method is used to analyze and know: SiO in high-grade bauxite products 2 content of 5.19%, the removal rate of silicon is 91.33%, the content of fluorine is 19.80%, Al 2 o 3 The content is 65.20%.

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Abstract

The invention provides a method of utilizing low-quality bauxite to prepare aluminum oxide. The method mainly comprises the following steps: adopting 50 to 100-mesh low-quality bauxite particles and hydrogen fluoride gas to react for 10 to 30min at the room temperature of 110 DEG C by using a chemical flotation method, so as to obtain high-quality bauxite; dissolving the high-quality bauxite for 1 to 3h at the temperature of 245 to 260 DEG C by adopting a sodium hydroxide solution, and filtering to obtain soluble aluminum filter liquor; pumping carbon dioxide into the soluble aluminum filter liquor at the speed of 2.5 to 3.5L / min to perform a carbonating disintegration reaction until a carbonating disintegration mixture with the pH value being 10 to 12 is formed, and sequentially filtering, washing, drying and roasting the carbonating disintegration mixture to obtain aluminum oxide. The method of utilizing the low-quality bauxite to prepare the aluminum oxide is relatively simple, short in technological process, low in energy consumption and suitable for being produced in a large scale.

Description

technical field [0001] The invention relates to low-grade bauxite, in particular to a method for preparing alumina by treating low-grade bauxite with chemical flotation. Background technique [0002] With the rapid and sustainable development of the national economy, my country's aluminum industry has undergone earth-shaking changes. The rapid development of the aluminum industry has better met the needs of national economic construction and social development, but it has also brought about the problem of massive consumption of resources and energy. In particular, the lack of bauxite resources has become a bottleneck restricting the sustainable development of my country's aluminum industry. According to statistics, from 2001 to 2007, the grade of bauxite used in the production of alumina and aluminum fluoride in my country dropped significantly, and the aluminum-silicon ratio of the ore dropped from an average of about 10 to an average of less than 7. Putting into productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/06
Inventor 张光旭秦传钧张建设邓军韩洋张保民宁站昭王二军肖郁良张斌魏俊峰
Owner 洛阳国兴矿业有限公司