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A method based on combined leaching of spodumene by microwave and pressure field

A spodumene and pressure field technology, which is applied in the field of spodumene leaching based on microwave and pressure field, can solve the problems of narrow transformation temperature range and low transformation rate of spodumene ore, so as to reduce the hidden danger of melting and ringing, Short process, good process effect

Active Publication Date: 2019-11-15
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, the transformation temperature range of spodumene raw ore is narrow, that is, 930-1050°C, and the transformation rate is low

Method used

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  • A method based on combined leaching of spodumene by microwave and pressure field
  • A method based on combined leaching of spodumene by microwave and pressure field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method based on microwave and pressure field combined leaching spodumene, comprising the steps:

[0034] 1) Grinding: use spodumene concentrate as raw material, grind, add coal powder of 2% of the total mass of raw material, mix evenly, and obtain a mixture;

[0035] 2) Crystal transformation

[0036] Using the silicon carbide lining the rotary kiln as the heat source carrier, heat the mixture obtained in step 1) to 1000°C under the condition of microwave power of 1500w, and then use microwave irradiation to transform the crystal form at a constant temperature of 1000°C 15min, then cooled to room temperature to obtain β-type spodumene;

[0037] 3) Leaching

[0038] Grind the β-type spodumene obtained in step 2), and add water to make a slurry to obtain a slurry; put the slurry into an autoclave, then add sulfuric acid with a concentration of 2%, and under the conditions of a pressure of 0.2Mpa and 120°C, the stirring speed is 500r / min, leaching for 20min to obtain ...

Embodiment 2

[0041] A method based on microwave and pressure field combined leaching spodumene, comprising the steps:

[0042] 1) Grinding: use spodumene concentrate as raw material, grind, add coal powder with 8% of the total mass of raw material, mix evenly, and obtain a mixture;

[0043] 2) Crystal transformation

[0044] Using the silicon carbide lining the rotary kiln as the heat source carrier, the mixture obtained in step 1) is heated to 1180°C under the condition of microwave power of 4000w, and then the crystal form is transformed under the constant temperature condition of 1180°C by microwave irradiation. 120min, then cooled to room temperature to obtain β-type spodumene;

[0045] 3) Leaching

[0046] Grind the β-type spodumene obtained in step 2), and add water to make a slurry to obtain a slurry; put the slurry into an autoclave, then add sulfuric acid with a concentration of 10%, and under the conditions of a pressure of 1.6Mpa and 200°C, the stirring speed is 1800r / min, le...

Embodiment 3

[0049] A method based on microwave and pressure field combined leaching spodumene, comprising the steps:

[0050] 1) Grinding: use spodumene concentrate as raw material, grind, add coal powder with 5% of the total mass of raw material, mix evenly, and obtain a mixture;

[0051] 2) Crystal transformation

[0052] Using the silicon carbide lining the rotary kiln as the heat source carrier, heat the mixture obtained in step 1) to 1100°C under the condition of microwave power of 2500w, and then use microwave irradiation to transform the crystal form under the constant temperature condition of 1100°C 60min, then cooled to room temperature to obtain β-type spodumene;

[0053] 3) Leaching

[0054] Grind the β-type spodumene obtained in step 2), and add water to make a slurry to obtain a slurry; put the slurry into an autoclave, then add sulfuric acid with a concentration of 6%, and under the conditions of a pressure of 0.8Mpa and 160°C, the stirring speed is 1100r / min, leaching fo...

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Abstract

The invention discloses a method for leaching spodumene based on combination of a microwave and a pressure field, and belongs to the production technology field of lithium salt extracted from spodumene in chemical metallurgy. The method comprises the steps of (1) grinding ore; (2) transforming an out-field irradiation crystal form; (3) pressure leaching; and (4) separating and purifying. Accordingto the technical scheme, microwave irradiation is adopted on the spodumene, so that a crystal form transformation temperature range is expanded; and then a direct sulfuric acid leaching process is carried out on the irradiated spodumene, valuable metals such as lithium are leached into lithium sulfate under the conditions of heating and pressurizing, then the lithium sulfate is separated and purified, a solution is recovered, and a final product i.e. the lithium salt is obtained, so that an application range of a complicated spodumene raw material is further expanded. The technical scheme hasthe advantages of short flow, energy conservation, emission reduction, excellent current joining process and the like.

Description

technical field [0001] The invention specifically relates to a method for leaching spodumene combined with microwave and pressure field, and belongs to the technical field of production of lithium salt extracted from spodumene in chemical metallurgy. Background technique [0002] Spodumene (LiAlSi 2 o 6 ) ore is an important chemical raw material, and it is also the main raw material for preparing other lithium salts and lithium metal, generally containing Li 2 O1~2%, Li after beneficiation and enrichment 2 O content can reach 5% to 7%. Rock-type lithium deposits are mainly pegmatite-type, and are concentrated in Altai, Xinjiang, and Jiaka, western Sichuan. Among them, the proven lithium oxide resources in western Sichuan are about 3.6 million tons, accounting for the nationally proven lithium resources. (containing salt lake lithium and hard rock lithium), accounting for more than 7.8% of the world's proven lithium resources. Chen Yuedi from Xinjiang Haoxin Lithium Sal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B3/08C22B1/02
CPCC22B1/02C22B3/08C22B26/12Y02P10/20
Inventor 冀成庆沈明伟朱昌洛蔡旺李可及周雄廖祥文
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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