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Low-temperature roasting technology for lepidolite

A technology of low-temperature roasting and lepidolite, applied in the direction of improving process efficiency, lithium carbonate;/acid carbonate, etc., can solve the problems of high production cost, large equipment investment, poor efficiency, etc., and achieve environmental pollution Small, reduce the roasting temperature, reduce the effect of waste

Inactive Publication Date: 2021-02-09
萍乡市拓源实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production cost is high, equipment investment is large, and the benefits of industrial production are not good. Therefore, we propose a lepidolite low-temperature roasting process to solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A lepidolite low-temperature roasting process, comprising the following process flow:

[0024] Step 1: After the lepidolite raw material is pulverized by a pulverizer, lepidolite ore powder is obtained, and the particle size of the lepidolite ore powder after crushing is controlled at 230-260 mesh;

[0025] Step 2: Put the lepidolite ore powder into the rotary kiln for low-temperature roasting, and at the same time, pass water vapor into the rotary kiln, roast for 33-45 minutes, and control the roasting temperature at 350-370 degrees Celsius, so that the metal crystals in the lepidolite ore powder are initially Dissociation, thereby obtaining pretreated lepidolite ore powder A;

[0026] Step 3: Put the pretreated lepidolite powder A and sulfuric acid obtained in step 2 into a two-screw stirring device for mixed reaction, and then put the obtained mixed slurry into a filter device for filtering to obtain a mixed slurry B;

[0027] Step 4: put the mixed slurry B into th...

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PUM

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Abstract

The invention discloses a low-temperature roasting technology for lepidolite. The technology comprises the following technological process that Step 1, a lepidolite raw material is crushed through a crusher to obtain lepidolite mineral powder; Step 2, the lepidolite mineral powder is put into a rotary kiln to be roasted at the low temperature, meanwhile, water vapor is introduced into the rotary kiln, roasting treatment is conducted for 33-45 min, the roasting temperature is controlled to be 350-370 DEG C, metal crystals in the lepidolite mineral powder are preliminarily dissociated, and thuspretreated lepidolite mineral powder A is obtained; Step 3, the pretreated lepidolite mineral powder A obtained in Step 2 and sulfuric acid are subjected to a mixed reaction. The technological processis relatively simple, environmental pollution is relatively small, the yield of lithium carbonate is relatively high, meanwhile, the extraction rate of lithium is greatly increased, resource waste isreduced, a low-temperature roasting method is adopted, the roasting temperature is greatly reduced, meanwhile, the conversion rate of lithium is greatly increased, the production cost is greatly reduced, and the technology has the important market prospects.

Description

technical field [0001] The invention relates to the technical field of lepidolite roasting, in particular to a low-temperature roasting process of lepidolite. Background technique [0002] Lepidolite is an important lithium mineral for extracting lithium, and its chemical composition is KLi 1.5 al 1.5 \(OH,F) 2 . It is a basic aluminosilicate of lithium, one of the mica minerals, and exists in a complex aggregate structure of fine scales. Lepidolite roasting is an extremely important key process for lithium extraction, which is directly related to lithium extraction rate and production cost. [0003] At present, the main methods for processing lepidolite ore are limestone roasting, sulfuric acid, sulfate, and pressure cooking. The limestone roasting method is to mix and grind lepidolite ore and limestone at a ratio of 1:3, and roast at 875-911°C. The calcined material is quenched in water, ground and then leached; the lithium decomposition rate is about 81%. The metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/06C22B1/02C22B3/12C22B3/44C22B26/12C01D15/08
CPCC22B1/06C22B1/02C22B3/12C22B3/44C22B26/12C01D15/08Y02P10/20
Inventor 曾国富
Owner 萍乡市拓源实业有限公司