Pretreatment and leaching method of lepidolite

A lepidolite and pretreatment technology, which is applied in the field of lithium extraction from ores, can solve problems such as inability to carry out industrial operations, low industrial application value, and expensive potassium sulfate, so as to reduce energy consumption for lithium concentration, less impurities, and low production costs Effect

Inactive Publication Date: 2019-06-25
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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AI Technical Summary

Problems solved by technology

[0016] The traditional sulfate roasting method generally uses a single potassium sulfate, or a small amount of sodium sulfate mixed with potassium sulfate as the main ingredient. Potassium sulfate is expensive and the cost of reagents is high, so the industrial application value is not high.
The current sulfate roasting lithium extraction process is to reduce the amount of potassium sulfate as much as possible and increase the amount of sodium sulfate. On the premise of ensuring the lithium leaching rate, the reagent cost of potassium sulfate should be reduced as much as possible. However, after increasing the amount of sodium sulfate, the calcined sand will be sintered. Even melting, resulting in the impossibility of industrial operation, and the leaching rate of rubidium and cesium is very low

Method used

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  • Pretreatment and leaching method of lepidolite
  • Pretreatment and leaching method of lepidolite
  • Pretreatment and leaching method of lepidolite

Examples

Experimental program
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Effect test

Embodiment 1

[0088] Proceed as follows:

[0089] ① Take 100g lepidolite concentrate and weigh the following reagents: 10g K 2 SO 4 , 30g Na 2 SO 4 , 5g CaO, 5g CaCO 3 , 3g of rubidium and cesium displacer, the reagents are mixed and ground to more than 50% and less than 200 mesh;

[0090] ②Mix the lepidolite concentrate and the finely ground reagent evenly;

[0091] ③Put the mixed material in a crucible and bake at 1050°C for 60 minutes;

[0092] ④ Grind the calcined sand until 85% of it is less than -100 mesh;

[0093] ⑤Transfer the finely ground calcined sand to the leaching tank for one-stage leaching. The leaching agent used is the second-stage leaching solution obtained from the previous operation under the same conditions. The dosage is 120ml, the temperature is 50°C, and it is stirred for 60 minutes;

[0094] ⑥ For the second-stage leaching, add the washing water and sulfuric acid obtained from the previous operation under the same conditions to the leaching residue of the fi...

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Abstract

The invention relates to the technical field of extracting lithium from ores, and particularly discloses a pretreatment and leaching method of lepidolite. The method comprises the first step of grinding of a reagent, the second step of mixing, the third step of roasting, the fourth step of crushing and grinding, the fifth step of one-stage leaching, the sixth step of two-stage leaching and the seventh step of pulping and washing. The method is economical and high in operability and has the industrial application value, calcium oxide and calcium carbonate are added during roasting to play a role of fixing fluorine, the sintering performance of the calcine can be improved, and calcine is loose and fragile.

Description

technical field [0001] The invention belongs to the technical field of extracting lithium from ores, and in particular relates to a method for pretreatment and leaching of lepidolite ore. Background technique [0002] As the lightest metal, lithium has the characteristics of low density and strong chemical activity. Lithium and its compounds are widely used in rechargeable batteries, atomic energy, ultra-light alloys, electronic devices, ceramics, glass, electrolytic aluminum, refrigerants and pharmaceutical tranquilizers. has an irreplaceable role. [0003] Due to the development of electric vehicles, the demand for lithium batteries in the global market continues to rise, resulting in a rapid increase in the demand for lithium. How to develop and utilize various lithium resources to prepare lithium carbonate to meet the market demand for lithium carbonate is in front of us. urgent task. [0004] Lithium exists in nature in two forms: solid mineral resources and liquid de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/08C22B3/44C22B26/12
CPCY02P10/20
Inventor 杨志平刘辉李大炳孟运生张静敏
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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