Method of recovering fluorine resource in process of processing low-grade bauxite by chemical floatation method

A chemical flotation and bauxite technology, applied in the directions of alumina/aluminum hydroxide, ammonium halide, silicon oxide, etc., can solve the problems of resource and energy consumption, improve the recovery rate, reduce the cost, and the treatment process is simple and easy row effect

Inactive Publication Date: 2015-12-30
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

The rapid development of the aluminum industry has better met the needs of national economic construction and

Method used

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  • Method of recovering fluorine resource in process of processing low-grade bauxite by chemical floatation method
  • Method of recovering fluorine resource in process of processing low-grade bauxite by chemical floatation method
  • Method of recovering fluorine resource in process of processing low-grade bauxite by chemical floatation method

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Example Embodiment

[0030] Example 1

[0031] see figure 1 , the first embodiment of the present invention provides a method for recovering fluorine resources from a chemical flotation process for treating low-quality bauxite, comprising the following steps:

[0032]Chemical flotation desiliconization: provide the low-grade bauxite raw ore shown in Table 1, place it in a crusher for crushing, and then place the crushed low-grade bauxite in a grinder for grinding to obtain The particle size is 100 mesh low-grade bauxite particles; 10.00 g of the 100-mesh low-grade bauxite particles are placed in a fluidized bed reactor, and hydrogen fluoride gas is passed into the fluidized bed reactor at 110 ° C, The reaction was carried out for 30 min to obtain a desiliconized solid residue and a gas product containing silicon fluoride; the desiliconized solid residue was washed with clean water and filtered to obtain 6.969g of high-quality bauxite product. X-ray fluorescence analysis was used to analyze: SiO ...

Example Embodiment

[0037] Example 2

[0038] The second embodiment of the present invention provides a process for removing silicon from low-grade bauxite by chemical flotation, which is different from the first embodiment in that:

[0039] In the step of removing silicon by chemical flotation, the reaction temperature of the low-grade bauxite particles and hydrogen fluoride gas was 70° C., and the reaction was performed for 15 minutes to obtain 5.400 g of high-grade bauxite products. X-ray fluorescence analysis was used to analyze: SiO in high-quality bauxite products 2 The content is 1.41%, the removal rate of silicon is 97.65%, the content of fluorine is 23.41%, and the Al 2 O 3 The content is 68.53%.

[0040] In the step of gas absorption and ammonolysis, the gas product is passed into the absorption tower at -4kPa, and the gas product is hydrolyzed at 80°C, and the content of the material in the ammonolysis kettle is neutralized after ammonolysis. The pH was 8 and aged at 80°C for 1.5 h...

Example Embodiment

[0042] Example 3

[0043] The third embodiment of the present invention provides a process for removing silicon from low-grade bauxite by chemical flotation, which is different from the first embodiment in that:

[0044] In the chemical flotation desilicon step, the reaction temperature of the low-grade bauxite particles and the hydrogen fluoride gas was 20° C., and the reaction was performed for 20 min to obtain 5.410 g of high-grade bauxite products. X-ray fluorescence analysis was used to analyze: SiO in high-quality bauxite products 2 The content is 5.19%, the removal rate of silicon is 91.33%, the content of fluorine is 19.80%, and the Al 2 O 3 The content is 65.20%.

[0045] In the step of gas absorption and ammonolysis, the gas product is passed into the absorption tower at -5kPa, and the gas product is hydrolyzed at 78°C. pH was 8 and aged at 78°C for 2 hours.

[0046] In the step of recovering fluorine resources, the fluorine-containing filtrate is concentrated u...

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Abstract

The invention provides a method of recovering a fluorine resource in a process of processing low-grade bauxite by a chemical floatation method. The method comprises the following steps: placing low-grade bauxite particles with a particle size of 50 meshes to 100 meshes and hydrogen fluoride gas into a fluidized bed reactor, reacting for 10 to 30 minutes at a room temperature of 110 DEG C to obtain silicon-removed solid residue and a gas product containing silicon fluoride; absorbing the gas product by adopting an ethanol aqueous solution to obtain a hydrolysis product containing the silicon dioxide; adding ammonium water into the hydrolysis product at the temperature of 70 to 90 DEG C until the pH value is 6 to 8; then aging for 0.5 to 2 hours at the temperature of 70 to 90 DEG C to obtain turbid liquid; sequentially performing the steps such as filtering, decompressing, concentrating and crystallizing the turbid liquid to recover ammonium chloride solid. The method is mainly used for recovering the fluorine resource from the disintegration waste gas of the low-grade bauxite processed by the chemical floatation method, so that waste is converted to treasure, and the method has the advantages of environmental friendliness, energy conservation and low cost.

Description

technical field [0001] The invention relates to a low-grade bauxite decomposition and comprehensive utilization technology, in particular to a method for recovering fluorine resources from the chemical flotation process for processing low-grade bauxite. 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 drop...

Claims

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Application Information

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IPC IPC(8): C01C1/16C01B33/12C01F7/02
Inventor 张保民张斌秦传钧张建设宁站昭王二军肖郁良魏俊峰
Owner 洛阳国兴矿业有限公司
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