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A kind of lepidolite heap leaching leaching method

A lepidolite and heap leaching technology, which is applied in the field of lithium extraction from ores, can solve the problems of long aging time, low equipment capacity, and high energy consumption

Active Publication Date: 2021-04-13
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the high-temperature calcination link is reduced, the lepidolite concentrate must be ground to 70% and pass 200 mesh, and the grinding cost is relatively high; and in order to ensure that the defluorination reaches more than 95%, it must be kept for 20-30 hours and the aging time is long Lead to high energy consumption and low equipment productivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The composition of a lepidolite sample is as follows:

[0075] Element Li 2 o

SiO 2

Al 2 o 3

K 2 o

Fe 2 o 3

MnO F Rb 2 o

Na 2 o

Cs 2 o

content% 3.17 48.7 22.6 7.8 2.2 0.40 4.5 0.86 0.87 0.06

[0076] Proceed as follows:

[0077] ① 100Kg lepidolite is finely ground, after grinding +60 mesh 6.1%, -200 mesh 70%;

[0078] ② Add 90kg of concentrated sulfuric acid with a concentration of 96% to the finely ground lepidolite sample and mix well, then add 10kg of water and 5kg of fluorosilicic acid, mix well, and then put it in an oven at 180°C for aging for 4 hours;

[0079] ③Crush the matured material to 5-20mm, and then put it into a heap leaching column with a diameter of Φ200×3500, and the height of the material layer is 3.2m;

[0080] ④Spray water on the ore heap for heap leaching operation, the water temperature is 25°C, and the spraying intensity is 40L / m 2 h, each spraying 4h stop 2h,...

Embodiment 2

[0084] The composition of a lepidolite sample is as follows:

[0085] Element Li 2 o

SiO 2

al 2 o 3

K 2 o

Fe 2 o 3

MnO F Rb 2 o

Na 2 o

content% 2.87 54.6 23.5 8.3 1.54 0.39 4.1 0.93 0.83

[0086] Proceed as follows:

[0087] ① 125Kg lepidolite is finely ground, after grinding +60 mesh 9.3%, -200 mesh 35%;

[0088] ② Add 100Kg of 97% concentrated sulfuric acid to the finely ground lepidolite sample and mix well, then add 20L of the first stage effluent collected in Example 1, and 3kg of fluorosilicic acid, quickly mix well, and then put it at 150°C Curing in the oven for 12 hours;

[0089] ③Crush the matured material to 10-30mm, and then put it into a heap leaching column with a diameter of Φ200×3500, and the height of the material layer is 4m;

[0090] ④ Spray the third effluent collected in Example 1 on the ore heap first, and then add water for spraying after use, the temperature is 35°C, and the...

Embodiment 3

[0094] The composition of a lepidolite sample is as follows:

[0095] Element Li 2 o

SiO 2

Al 2 o 3

K 2 o

Fe 2 o 3

MnO F Rb 2 o

Na 2 o

content% 3.36 47.3 23.8 8.8 3.45 0.44 4.8 1.04 0.98

[0096] Proceed as follows:

[0097] ① 3000Kg lepidolite is finely ground, after grinding +60 mesh 5.4%, -200 mesh 56%;

[0098] ②Add 2400Kg of concentrated sulfuric acid with a concentration of 93% to the finely ground lepidolite ore sample and mix well, then add 450L of the first stage effluent collected under the same conditions as before, and 200kg of fluorosilicic acid, quickly mix well, and then transfer to aging Fill the pool with hot air at 120°C and heat-preserve for 15 hours;

[0099] ③Crush the matured material to 5-50mm, and then put it into a heap leaching tower with a size of 900×900×5500, and the height of the material layer is 5m;

[0100] ④ Spray the third stage of the effluent collected in the pr...

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PUM

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Abstract

The invention relates to the technical field of extracting lithium from ores, and specifically discloses a lepidolite heap leaching method, comprising the following steps: ① grinding ore; ② mixing acid; ③ mixing water and fluorosilicic acid; ④ aging; Heap leaching; ⑦ Collect leachate. The method of the invention does not need high-temperature calcination for defluorination, low-temperature calcination, and pressure leaching, reduces equipment investment, has low energy consumption, little environmental pollution, and is simple and efficient.

Description

technical field [0001] The invention belongs to the technical field of lithium extraction from ores, and in particular relates to a lepidolite heap leaching method. Background technique [0002] Due to the development of electric vehicles, the demand for lithium batteries in the global market continues to rise, which has led to a rapid increase in the demand for lithium carbonate. How to develop and utilize various lithium resources to prepare lithium carbonate and meet the market demand for lithium carbonate is an urgent task before us. [0003] Lithium exists in nature in two forms: solid mineral resources and liquid deposit resources. Solid mineral resources are mainly divided into spodumene minerals and lepidolite minerals. China's spodumene mineral resources are relatively scarce, but lepidolite is very rich. The lepidolite reserves in Yichun, Jiangxi Province are huge, and the lithium reserves are 2.578 million tons in terms of lithium oxide. Therefore, extracting lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B26/12
CPCY02P10/20
Inventor 杨志平李大炳
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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