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Method for cyclically using lithium deposition for preparing sodium carbonate solution to produce lithium carbonate

A technology for sinking lithium mother liquor and sodium carbonate, which is applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of increased lithium loss and large steam consumption, and achieve increased lithium sinking rate and low consumption of sodium carbonate , the effect of low energy consumption

Active Publication Date: 2009-07-15
JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method also consumes a lot of steam, and the part returning to the lithium leaching system increases the loss of lithium due to the long circulation route.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] 1. Freeze 3500L Lithium Precipitating Mother Liquor to -3°C, and then centrifuge to separate sodium decahydrate to obtain Sodium Analyzing Mother Liquor, and measure Sodium Analyzing Mother Liquor SO 4 2- The content is 26g / L;

[0030] 2. Press filter the sodium analysis mother liquor to remove solid residue;

[0031] 3. Raise the temperature of the filtered sodium analysis mother liquor to 95°C and keep it warm for 15 minutes to precipitate lithium carbonate. Then separate lithium carbonate and thermal analysis mother liquor, and lithium carbonate is rinsed with a small amount of condensed water;

[0032] 4. Get 550 kilograms of sodium carbonate to be fully dissolved in 1900L of thermal analysis mother liquor, then filter to obtain 2000L of sodium carbonate solution, and the concentration of sodium carbonate in sodium carbonate solution is 290g / L;

[0033] 5. There is a small amount of remaining thermal analysi...

Embodiment 2

[0038] This embodiment includes the following steps:

[0039] 1. Freeze the 3500L lithium precipitation mother liquor to 6°C, and then centrifuge to separate sodium decahydrate to obtain the sodium analysis mother liquor, and measure the sodium analysis mother liquor SO 4 2- The content is 58g / L;

[0040] 2. Press filter the sodium analysis mother liquor to remove solid residue;

[0041] 3. Raise the temperature of the filtered sodium analysis mother liquor to 98°C and keep it warm for 10 minutes to precipitate lithium carbonate. Then separate lithium carbonate and thermal analysis mother liquor, and lithium carbonate is rinsed with a small amount of condensed water;

[0042] 4. Get 500 kilograms of sodium carbonate to be fully dissolved in 1900L of thermal analysis mother liquor, then filter to obtain 2000L of sodium carbonate solution, and the concentration of sodium carbonate in sodium carbonate solution is 260g / L;

[0043] 5. A small amount of remaining thermal analysi...

Embodiment 3

[0048] This embodiment includes the following steps:

[0049] 1. Freeze 3500L Lithium Precipitation Mother Liquor to 4°C, and then centrifuge to separate sodium decahydrate to obtain the sodium analysis mother liquor, and measure the sodium analysis mother liquor SO 4 2- The content is 40g / L;

[0050] 2. Press filter the sodium analysis mother liquor to remove solid residue;

[0051] 3. Raise the temperature of the filtered sodium analysis mother liquor to 100°C and keep it warm for 5 minutes to precipitate lithium carbonate. Then separate lithium carbonate and thermal analysis mother liquor, and lithium carbonate is rinsed with a small amount of condensed water;

[0052] 4. Get 450 kilograms of sodium carbonate to be fully dissolved in 1900L of thermal analysis mother liquor, then filter to obtain 2000L of sodium carbonate solution, and the concentration of sodium carbonate in sodium carbonate solution is 240g / L;

[0053] 5. A small amount of remaining thermal analysis moth...

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PUM

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Abstract

The invention discloses a method for producing lithium carbonate by circularly applying mother solution from which lithium is subsided to prepare a sodium carbonate solution, which comprises the sequential steps such as refrigerating the mother solution from which lithium is subsided, filtering the mother solution from which sodium is sought out, heating the purified liquid of the mother solution from which the sodium is sought out, sweating out the mother solution to prepare the sodium carbonate solution, and performing reaction of the sodium carbonate solution with the lithium sulfate solution so that lithium is subsided. The invention has the characteristics of high lithium sedimentation efficiency, simple technique, stable product, high production efficiency, high recovery rate, low consumption of sodium carbonate, low energy consumption and low cost.

Description

Technical field: [0001] The invention relates to a method for recycling lithium-precipitating mother liquor for preparing sodium carbonate solution to produce lithium carbonate. Background technique: [0002] Lithium is a rare resource, but lithium and lithium compounds are widely used in more and more fields. How to make full use of lithium resources while taking into account energy saving and consumption reduction is a common concern of enterprises and society. [0003] In the production of lithium carbonate by the traditional sulfuric acid method, the balance of process liquid volume is the key issue to solve the recovery rate of lithium. If the liquid volume is unbalanced, the amount of water with lithium is lost more, and the loss of lithium is also more; the longer the route of water circulation with lithium, the greater the loss of lithium. Therefore, the production of lithium carbonate by sulfuric acid method is one of the keys to the process technology to solve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 何国端李强葛建敏李南平
Owner JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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