Method for lepidolite defluorination and valuable metal leaching

A technology of valuable metals and lepidolite, applied in the direction of improving process efficiency, etc., can solve the problems of low leaching rate of valuable metals, poor environment of roasting workshop, and large corrosion of equipment, so as to improve defluorination rate and leaching of valuable metals efficiency, reduce equipment investment, and reduce production costs

Active Publication Date: 2016-11-09
HUNAN RES INST FOR NONFERROUS METALS
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AI Technical Summary

Problems solved by technology

[0011] Sulfuric acid roasting method: the roasting temperature is higher, the equipment is more corr

Method used

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  • Method for lepidolite defluorination and valuable metal leaching
  • Method for lepidolite defluorination and valuable metal leaching
  • Method for lepidolite defluorination and valuable metal leaching

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The main composition of lepidolite is Li 2 O 3.95%, Rb 2 O 1.11%, Cs 2 O 0.288%, K 2 O 7.02%, Fe0.18%, SiO 2 52.73%, Al 2 o 3 25.26%, F 4.45%.

[0040] Grind lepidolite until the particle size is less than 0.074mm and account for 70%. Take 100kg of fine ore, add 80kg of concentrated sulfuric acid with a mass concentration of 93%, mix well, then add 0.08kg of water, mix well, and the mixing time is 3min. Storage aging defluorination, storage time is 30h. Obtain 176kg (dry basis) of mature ore, the mature ore contains F 0.12%, and the defluorination rate is 95.25%.

[0041] Add 440kg of water to the mature ore, stir and leaching in the leaching tank for 1 hour, the leaching temperature is 100°C, filter the pulp, and wash the leaching slag countercurrently for 4 times to obtain 67.6kg (dry basis) of leaching slag. The leaching slag contains Li 2 O 0.49%, Rb 2 O 0.15%, Cs 2 O0.041%, K 2 O 1.0%, Li 2 O, Rb 2 O, Cs 2 O, K 2 O leaching rates were 91.61%, 90.8...

Embodiment 2

[0043] The main composition of lepidolite is Li 2 O 2.35%, Rb 2 O 0.89%, Cs 2 O 0.120%, K 2 O 6.42%, Fe0.12%, SiO 2 53.21%, Al 2 o 3 24.12%, F 3.60%.

[0044] Grind lepidolite until the particle size is less than 0.074mm and account for 75%. Take 100kg of fine ore, add 90kg of concentrated sulfuric acid with a mass concentration of 93%, mix well, then add 0.09kg of water, mix well, and the mixing time is 4min. Storage aging defluorination, storage time is 25h. 187kg (dry basis) of mature ore was obtained, the mature ore contained F 0.09%, and the defluorination rate was 95.33%.

[0045] Add 280kg of water to the mature ore, stir and leaching in the leaching tank for 2.5h, the leaching temperature is 95°C, filter the pulp, wash the leaching slag countercurrently for 3 times, and obtain 65.30kg of leaching slag (dry basis). The leaching slag contains Li 2 O 0.32%, Rb 2 O 0.11%, Cs 2 O0.015%, K 2 O 0.80%, Li 2O, Rb 2 O, Cs 2 O, K 2 O leaching rates were 91.11%, ...

Embodiment 3

[0047] The main composition of lepidolite is Li 2 O 1.96%, Rb 2 O 0.74%, Cs 2 O 0.100%, K 2 O 5.35%, Fe0.16%, SiO 2 54.62%, Al 2 o 3 26.34%, F 3.40%.

[0048] Grind lepidolite until the particle size is less than 0.074mm, accounting for 80%. Take 100kg of fine ore, add 100kg of concentrated sulfuric acid with a mass concentration of 93%, mix well, then add 0.1kg of water, mix well, and the mixing time is 6min. Storage aging defluorination, storage time is 20h. Obtain 196kg (dry basis) of mature ore, the content of F in the mature ore is 0.08%, and the defluorination rate is 95.38%.

[0049] Add 196kg of water to the mature ore, stir and leaching in the leaching tank for 4 hours, the leaching temperature is 90°C, filter the pulp, and wash the leaching slag countercurrently twice to obtain 63.10kg (dry basis) of leaching slag. The leaching slag contains Li 2 O 0.12%, Rb 2 O 0.05%, Cs 2 O0.010%, K 2 O 0.40%, Li 2 O, Rb 2 O, Cs 2 O, K 2 O leaching rates were 96.1...

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Abstract

The invention discloses a method for lepidolite defluorination and valuable metal leaching. The method comprises the following steps that (1) lepidolite is crushed and levigated, mineral powder is obtained, and in the mineral powder, the mass of mineral powder with the particle size smaller than 0.074 mm accounts for 70% or above of the total mineral powder mass; (2) the mineral powder is added with concentrated sulphuric acid, the mineral powder and the concentrated sulphuric acid are uniformly mixed, and the mass ratio of the concentrated sulphuric acid to the mineral powder is 0.8-1:1; then water is added into the mineral powder and the concentrated sulphuric acid, the mass ratio of the water to the mineral powder is 0.08-0.1:1, the water, the mineral powder and the concentrated sulphuric acid are uniformly mixed, and mixed minerals are obtained; the mixed minerals are subjected to heat preservation and stockpiling for 20-30 h, defluorination is achieved, and curing minerals are obtained; and (3) the curing minerals are added with water to be leached out, the mass ratio of the water to the curing minerals is 1.0-2.5:1, leaching is conducted for 2-4 h under the condition that the temperature is 90 DEG C-100 DEG C, mineral pulp is filtered, and leached slag and leached liquid are obtained. According to the method for lepidolite defluorination and valuable metal leaching, stockpiling, curing and defluorination are conducted through self heating, technological processes are simplified, the production cost is substantially reduced, and equipment investments are decreased; the curing defluorination-water leaching technology is adopted, so that the defluorination rate and the valuable metal leaching rate are increased; and the defluorination rate is larger than 95%, and the leaching rate of lithium, the leaching rate of potassium, the leaching rate of rubidium and the leaching rate of cesium are larger than 90%.

Description

technical field [0001] The invention relates to a method for lepidolite defluorination and valuable metal leaching. Background technique [0002] Lepidolite, also known as "scale mica", is an important lithium resource. Lepidolite is a basic aluminosilicate of potassium and lithium, which belongs to mica minerals, and its structural formula is MeF·MeOH·Al 2 o 3 · 3SiO2 2 , wherein: Me is Li, Na, K, Rb, Cs. Lepidolite is a member of the Li-rich end of the two isomorphic series of Al-Li and Fe-Li. The Al-Li series is incomplete isomorphic, while the Fe-Li series is complete isomorphic. All mica containing Li contains a certain amount of F - , the higher the Li content, the higher the F content. Therefore, the structure of lepidolite is stable, and the leaching conditions are relatively harsh. [0003] At present, the main processes for extracting lithium from lepidolite developed and reported at home and abroad are as follows: limestone sintering method, sulfate roastin...

Claims

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Application Information

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IPC IPC(8): C22B26/10C22B1/00C22B3/04
CPCC22B1/00C22B3/04C22B26/10Y02P10/20
Inventor 张著秦红李婕欧阳林莉杨文胡亮谭令吴海国龚益
Owner HUNAN RES INST FOR NONFERROUS METALS
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