Method for preparing aluminium fluoride by utilizing low grade bauxite

A low-grade bauxite, aluminum fluoride technology, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of hard grinding, high silicon, insoluble and so on

CN105110359AInactive Publication Date: 2015-12-02洛阳国兴矿业有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-12-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for preparing aluminium fluoride by utilizing low grade bauxite. The method mainly comprises the following steps: hydrochloric acid leaching to remove iron, stirring and ball kneading, high-temperature roasting to remove silicon, ultrasonic hydrofluoric acid washing and concentrated sulfuric acid washing to remove titanium. The method has the beneficial effects that the problem of how to effectively remove the impurities in the low grade bauxite, such as iron, silicon and titanium, to prepare fine aluminium fluoride is solved through the steps, so that the active ingredients in the low grade bauxite are fully utilized, thus improving the product quality and reducing the resource waste; and the method provided by the invention dispenses with pretreatment of the low grade bauxite, is mild in process conditions and is suitable for large-scale production.
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Description

technical field

[0001] The invention relates to a method for preparing aluminum fluoride, in particular to a method for preparing aluminum fluoride by using low-grade bauxite. Background technique

[0002] Aluminum fluoride is one of the necessary co-solvents in the production of electrolytic aluminum, which can reduce Al 2 o 3 melting point and can increase the conductivity of the electrolyte. With the development of alumina industry, the competition of aluminum fluoride products in the market is becoming increasingly fierce. my country's proven bauxite reserves are 3.056 billion tons, ranking fourth in the world, with sufficient resources and concentrated distribution, but 99% of them are diaspore-type bauxite, which is characterized by hard grinding and insoluble , high silicon, and low aluminum-silicon ratio. At present, the process of producing aluminum fluoride from bauxite in my country is mainly based on the hybrid method, which has a long production process, high ...

Examples

Embodiment Construction

[0040] The technical solutions of the present invention will be described in further detail below through specific implementation methods.

[0041] Hydrochloric acid leaching to remove iron: Add concentrated hydrochloric acid to low-grade bauxite particles to react to form a slurry; filter the slurry to obtain iron-containing leachate and iron-removing filter residue. Specifically, add concentrated hydrochloric acid to the low-grade bauxite particles according to the ratio of 0.5-4mL concentrated hydrochloric acid / 1g low-grade bauxite, and stir and react at a temperature of 40°C-80°C for 20-40min to form the slurry, Wherein, the volume fraction of the concentrated hydrochloric acid is 36%-38%. Diluting the slurry to obtain a thin slurry; filtering the slurry with a filter press to obtain the iron-containing leachate and iron-removing filter residue.

[0042] Stirring and kneading: Grinding the iron removal filter residue, adding ammonium fluoride solid, mixing the iron remova...