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An improved method for extracting alkali metal compounds from fluorine-fixed reconstituted lepidolite

A technology of alkali metal compounds and lepidolite, which is applied in the fields of alkali metal compounds, chemical instruments and methods, rubidium/cesium/francium compounds, etc., can solve the problems of large amount of acid scavenger, large material flow, waste of resources, etc., to achieve Eliminate uneven mixing, reduce production costs, and reduce energy consumption

Active Publication Date: 2016-06-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • An improved method for extracting alkali metal compounds from fluorine-fixed reconstituted lepidolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Mix lepidolite powder and calcium sodium chloride solution according to the ratio of lepidolite: calcium sodium chloride: water = 1000:820:2000, stir and slurry for 20 minutes; dry and granulate the uniformly mixed slurry to make particle size 25 ~ 30mm, and then dried to less than 5% of raw material moisture. The granular raw meal is heat-treated in a heating furnace at 720°C for 20 minutes to produce clinker; the high-temperature flue gas is cooled and absorbed by water to make acid. The clinker is soaked in water according to the initial liquid-solid mass ratio of 2:1, filtered and separated, and the slag is washed; after the solution is purified and concentrated, it is transferred to lithium carbonate for precipitation; after the lithium precipitation mother liquor is treated, it is transferred to rubidium and cesium salt for extraction.

[0055] The main mineral phase composition of the leaching slag dry basis is: CaF 2 7%; CaO.Al 2 o 3 .2SiO2 2 63%; CaO.SiO 2...

Embodiment 2

[0059] Mix lepidolite powder and calcium sodium chloride solution according to the ratio of lepidolite: calcium sodium chloride: water = 1000:710:1500, stir and slurry for 30 minutes; dry and granulate the uniformly mixed slurry to make particle size 5 ~ 10mm, and then dried to less than 5% of the raw material moisture. The granular raw meal is heat-treated in a heating furnace at 880°C for 40 minutes to produce clinker; the high-temperature flue gas is cooled and absorbed by water to make acid. The clinker is soaked in water according to the initial liquid-solid mass ratio of 2:1, filtered and separated, and the slag is washed; after the solution is purified and concentrated, it is transferred to lithium carbonate for precipitation; after the lithium precipitation mother liquor is treated, it is transferred to rubidium and cesium salt for extraction.

[0060] The main mineral phase composition of the leaching slag dry basis is: CaF 2 6.7%; CaO.Al 2 o 3 .2SiO2 2 61%; CaO.S...

Embodiment 3

[0064] Mix lepidolite powder and calcium sodium chloride solution according to the ratio of lepidolite: calcium sodium chloride: water = 1000:760:1800, stir and slurry for 25 minutes; dry and granulate the uniformly mixed slurry to make particle size 15 ~ 20mm, and then dried to less than 5% of the raw material moisture. The granular raw meal is heat-treated in a heating furnace at 800°C for 30 minutes to produce clinker; the high-temperature flue gas is cooled and absorbed by water to make acid. The clinker is soaked in water according to the initial liquid-solid mass ratio of 2:1, filtered and separated, and the slag is washed; after the solution is purified and concentrated, it is transferred to lithium carbonate for precipitation; after the lithium precipitation mother liquor is treated, it is transferred to rubidium and cesium salt for extraction.

[0065] The main mineral phase composition of the leaching slag dry basis is: CaF 2 6.9%; CaO.Al 2 o 3 .2SiO2 2 61.7%; Ca...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08C01D17/00C01B33/26
Inventor 胡启阳李新海郭华军王志兴
Owner CENT SOUTH UNIV
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