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Method for extracting lithium from spodumene ore and by-product zeolite or kassinite

A technology of spodumene and potassium nepheline, which is applied in the field of hydrometallurgy, can solve the problems of high sealing and dust collection requirements of roasting equipment, environmental pollution, etc., and can meet the environmental protection requirements of clean production, short process flow and simple equipment Effect

Active Publication Date: 2020-08-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fluoride is easy to cause environmental pollution, so this method requires high sealing and dust collection of roasting equipment. In addition, fluoride is corrosive, so equipment anti-corrosion and safe discharge of waste water are also issues that need to be considered

Method used

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  • Method for extracting lithium from spodumene ore and by-product zeolite or kassinite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) 80g spodumene ore (containing Li 2.6%, particle size-100 mesh) is mixed with 60% sodium hydroxide solution, wherein, the weight ratio of sodium hydroxide and spodumene ore is 4.8:1, at a temperature of Reaction at 270°C for 2h.

[0020] (2) Dilute the pulp after the reaction in step (1) with water, the weight of water used for dilution is 3 times of the weight of spodumene, filter to obtain lithium-containing solution and zeolite product, and the extraction rate of lithium reaches 94.1%.

[0021] (3) the lithium-containing solution that step (2) obtains is added sodium carbonate by precipitation reaction, obtains lithium carbonate product.

Embodiment 2

[0023] (1) 80g spodumene ore (containing Li 0.6%, particle size-100 mesh) is mixed with 70% sodium hydroxide solution, wherein, the weight ratio of sodium hydroxide and spodumene ore is 8:1, at a temperature of React at 330°C for 0.5h.

[0024] (2) Dilute the pulp that has been reacted in step (1) with water, the weight of water used for dilution is 4 times of the weight of spodumene, and filter to obtain lithium-containing solution and zeolite product, wherein the extraction rate of lithium reaches 99.1%.

[0025] (3) The lithium-containing solution obtained in step (2) is added into sodium phosphate to undergo a precipitation reaction to obtain a lithium phosphate product.

Embodiment 3

[0027] (1) 80g spodumene ore (containing Li 1.8%, particle size-200 mesh) is mixed with 85% sodium hydroxide solution, wherein, the weight ratio of sodium hydroxide and spodumene ore is 2.8:1, at a temperature of Reaction at 270°C for 3h.

[0028] (2) Dilute the pulp that has been reacted in step (1) with water, the weight of water used for dilution is 8 times of the weight of spodumene, and filter to obtain lithium-containing solution and zeolite product, wherein the extraction rate of lithium reaches 92.2%.

[0029] (3) The lithium-containing solution obtained in step (2) is added into sodium phosphate to undergo a precipitation reaction to obtain a lithium phosphate product.

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Abstract

The invention provides a method for extracting lithium from spodumene ore and producing a zeolite or kaliophilite byproduct through ore phase conversion, and belongs to the technical field of hydrometallurgy. The method comprises the steps: the spodumene ore and a sodium hydroxide or potassium hydroxide solution are added into a reactor to be stirred and mixed, and under the normal pressure condition, the appropriate temperature is controlled to conduct an ore phase conversion reaction; and through ore phase conversion, spodumene is converted into zeolite or kaliophilite, the lithium in the spodumene is transferred into the solution, a lithium-containing solution is obtained, and through chemical precipitation, a lithium product can be obtained from the solution. According to the method, awhole wet method technology is adopted to treat the spodumene ore, the valuable metal lithium in lithium ore of the type is extracted, the zeolite and kaliophilite products with the high additional value are obtained through ore phase conversion, and finally comprehensive utilization of resources is achieved; and additionally, the method has the advantages of being short in flow, few in working procedure, low in energy consumption and cost and the like, and meets the environmental protection requirement of clean production.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for extracting lithium from spodumene ore and producing zeolite or kassine by-product. Background technique [0002] Spodumene is the main mineral for extracting lithium. The natural spodumene ore is α-type with low activity. At present, the method commonly used in industry is to convert it into β-type by high-temperature roasting, and then add sulfuric acid to decompose and extract. . Due to the high temperature of the current high-temperature roasting (generally 1000-1200°C), the energy consumption is high, and the aluminum-silicon-calcium slag produced after sulfuric acid decomposition and leaching is difficult to use. Therefore, improving the level of lithium extraction technology is of great significance to the lithium smelting industry. [0003] Chinese patent CN201310138044.6 discloses a method for extracting lithium salt from spodumene by soda ash press...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B3/12
CPCC01B25/308C01B33/26C01B33/28C01D15/08Y02P10/20
Inventor 王成彦邢鹏曾磊马保中陈永强
Owner UNIV OF SCI & TECH BEIJING