Improved method for extracting alkali metal compound from solid fluorine reconstruction lepidolite

Abstract

The invention discloses an improved method for extracting an alkali metal compound from solid fluorine reconstruction lepidolite. According to the method, calcium salt and sodium salt liquor or suspension liquid is used as a reconstruction assistant, the assistant and the lepidolite are subjected to high-temperature heat treatment after mixing, pelleting and drying to obtain clinker, the clinker is soaked in water to obtain an alkali metal salt compound, the compound is soaked in acid after residue filtering to recycle a solid fluorine reconstruction reagent, and a high-quality silicate material is produced. The method has the advantages that comprehensive utilization of lepidolite mineral resources is achieved, recovery rate of alkali metal such as lithium, rubidium and cesium is high, cyclic utilization of the solid fluorine reconstruction reagent is achieved, raw material utilization rate is high, production cost is reduced greatly and environment protection is facilitated.

Description

technical field [0001] The invention relates to an improved method for extracting alkali metal compounds from fluorine-fixed and reconstructed lepidolite, which belongs to the field of mineral processing. Background technique [0002] With the rapid development of the lithium-ion battery market, the application of lithium batteries in the field of high-energy green energy is expanding rapidly. The demand for lithium carbonate at home and abroad is increasing, and the price is gradually rising. Lithium carbonate has become an important energy basic material and has been widely used in the world. Pay attention to. At present, lithium carbonate mainly comes from two types of lithium resources: salt lake brine and lithium-containing ore. South American salt lake brine provides most of the world's lithium carbonate; my country's salt lake brine has high content of impurities such as Mg, and the removal of impurities in the later stage is cumbersome, resulting in low product puri...

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Problems solved by technology

Limestone roasting method, chlorination roasting method, traditional sulfuric acid method, etc., all use high-temperature sintering for mineral phase reconstruction, because of its high energy consumption, large material flow rate, low extraction rate of alkali metals such as Li, and valuable metals rubidium, Resources such as cesium cannot be fully utilized, which does not reflect the advantages and value of lepidolite resource utilization. The sulfuric acid method for extracting alkali metals requires a large amount of acid scavenger due to the large amount of sulfuric acid used, and the solution mainly contains Al 3+ and F - Mainly, it is difficult to separate from the alkali metal, and the amount of alkali metal attached to the slag is large, thereby reducing the recovery rate of alkali metal in lepidolite

[0005] Chinese patent (Application No. 201210080657.4) discloses a method of processing raw minerals through mineral phase reconstruction, and reconstructs the mineral structure containing valuable components, so that the valuable components can be transformed into extractable and mutually separable states, thereby achieving high efficiency. Separation; Chinese patent (Application No. 201019060008.6) discloses a method and equipment for extracting lithium from lepidolite by chlorination roasting method, using sodium hydroxide as an auxiliary agent to reduce the melting point of the system, increase liquid phase slag, and improve reaction kinetics. And inhibit the escape of hydrogen chloride; but the comprehensive utilization of resources in these technical solutions is not enough, resulting in waste of resources

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