Method for separating and extracting lithium from lithium sulfate coarse ore

A technology for lithium sulfate and lithium extraction, applied in the direction of lithium carbonate; High, simple process effect

Active Publication Date: 2014-07-02
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the methods for extracting lithium from lithium ore to produce lithium carbonate mainly include sulfuric acid method, sulfate method, lime sintering method, soda ash pre

Method used

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  • Method for separating and extracting lithium from lithium sulfate coarse ore

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Effect test

Embodiment 1

[0033] In addition to magnesium, mix 200.00g of lithium sulfate coarse ore powder with 1500mL of water, add 100% calcium oxide, stir and react for 2 hours, separate after aging for 3 hours, and obtain 1485mL of the first solution. where Mg 2+ The content is 0.17g / L, and the measured magnesium removal rate is 96.88%; Li + Concentration is 3.25g / L, and lithium yield is 92.41%; SO 4 2- The concentration was 12.14g / L, and the sulfate radical removal rate was 63.58%.

[0034] In addition to sulfate, take 1460mL of the first solution, add 100% calcium chloride to it under magnetic stirring, react for 60 minutes, and separate after aging for 60 minutes to obtain 1450mL of the second solution, whose sulfate concentration is 2.65g / L , Remove 78.31% sulfate.

[0035] For calcium precipitation, put 1430mL of the second solution in a water bath at 60°C, add 100% sodium carbonate, stir and react for 60 minutes, and separate after aging for 30 minutes to obtain 1373mL of the third solut...

Embodiment 2

[0041] In addition to magnesium, mix 200.00g of lithium sulfate coarse ore powder with 3000mL of water, add 100% calcium oxide, stir and react for 3 hours, separate after aging for 2 hours, and obtain 2990mL of the first solution. where Mg 2+ The content is 0.13g / L, and the measured magnesium removal rate is 95.37%; Li + Concentration is 1.68g / L, and lithium yield is 96.46%; SO 4 2- The concentration is 8.02g / L, and the sulfate removal rate is 51.53%.

[0042] In addition to sulfate radicals, take 2970mL of the first solution, add 105% calcium chloride to it under magnetic stirring, react for 40 minutes, separate after aging for 30 minutes, and obtain 2962mL of the second solution, whose sulfate radical concentration is 3.28g / L , Remove 59.21% sulfate.

[0043] For calcium precipitation, put 2940mL of the second solution in a water bath at 80°C, add 105% sodium carbonate, stir and react for 50 minutes, and separate after aging for 60 minutes to obtain 2880mL of the third s...

Embodiment 3

[0049] In addition to magnesium, mix 200.00g of lithium sulfate coarse ore powder with 2000mL of water, add 105% calcium oxide, stir and react for 3 hours, separate after aging for 2 hours, and obtain 1990mL of the first solution. where Mg 2+ The content is 0.073g / L, and the measured magnesium removal rate is 98.24%; Li + Concentration is 2.51g / L, and lithium yield is 95.73%; SO 4 2- The concentration is 9.77g / L, and the sulfate removal rate is 60.71%.

[0050] In addition to sulfate, take 1970mL of the first solution, add 110% calcium chloride to it under magnetic stirring, react for 60 minutes, separate after aging for 30 minutes, and obtain 1963mL of the second solution, whose sulfate concentration is 2.74g / L , Remove 72.06% sulfate.

[0051] For calcium precipitation, take 1940mL of the second solution and place it in a water bath at 90°C, add 110% sodium carbonate, stir and react for 50 minutes, and separate after aging for 30 minutes to obtain 1880mL of the third sol...

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Abstract

The invention relates to a lithium extraction process and in particular discloses a method for separating and extracting lithium from lithium sulfate coarse ore. The method comprises the steps of removing magnesium, mixing lithium sulfate coarse ore powder with water, adding calcium oxide, reacting, ageing, and performing solid-liquid separation to obtain a first solution and solid residues; removing sulfate radicals, adding calcium chloride into the first solution, reacting, ageing, and performing solid-liquid separation to obtain a second solution and solid calcium sulfate; calcifying, adding sodium carbonate into the second solution, reacting, ageing, and performing solid-liquid separation to obtain a third solution and solid calcium carbonate; concentrating, adjusting the pH value of the third solution to be 3-8 by using hydrochloric acid, evaporating and concentrating, separating out solids, and performing solid-liquid separation to obtain a primary concentrated solution; extracting lithium carbonate, adding sodium carbonate into the primary concentrated solution, reacting, ageing, and performing solid-liquid separation to obtain solid lithium carbonate. According to the method, the energy consumption is low; a used impurity removal precipitant is low in price and easily available, and an impurity removal product, namely calcium carbonate can be recycled; the process is simple and easy to operate, the magnesium removal efficiency is high, and the lithium yield is high.

Description

technical field [0001] The invention relates to a lithium extraction process, in particular to a technology for extracting lithium from lithium sulfate rough ore. Background technique [0002] At present, there are mainly two ways to extract lithium from salt lake brine and from lithium ore. [0003] The process of extracting lithium from salt lake brine is basically to go through a series of separation treatments, and then add sodium carbonate to precipitate lithium to obtain lithium carbonate. For example: Qinghai Lithium Industry adopts multi-stage membrane separation technology, using Dongtai Jinel Salt Lake brine as raw material, using multi-stage membrane separation technology process route, can reduce the Mg:Li ratio in the old brine from 20:1 to about 1:2, Then add sodium carbonate to precipitate the lithium in the brine as lithium carbonate; CITIC Guoan uses the calcination method, using the brine of Xitaijiner Salt Lake as raw material, uses the calcination method...

Claims

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Application Information

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IPC IPC(8): C22B26/12C01D15/08
Inventor 李武王纯董亚萍乃学瑛孟庆芬党力
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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