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Method for preparing lithium carbonate by using high boric bittern saturated solution

A lithium carbonate solution technology, applied in the field of salt chemical industry, can solve the problems of high production cost, difficult production process, large equipment investment, etc., and achieve the effect of small equipment investment, high recovery rate, and low energy consumption

Inactive Publication Date: 2010-04-07
DAZHOU HENGCHENG ENERGY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid ore does not contain boron, but the extraction of lithium from surface lithium-containing brine requires the separation of lithium and boron first, which has disadvantages such as difficult production process, large equipment investment, high production cost, and low yield.

Method used

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  • Method for preparing lithium carbonate by using high boric bittern saturated solution
  • Method for preparing lithium carbonate by using high boric bittern saturated solution

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Add appropriate amount of Ca(OH) to the saturated brine solution with high boron content 2 And Na 2 CO 3 , Make a small amount of magnesium and calcium in the solution form Mg(OH) respectively 2 , CaCO 3 Precipitation, solid-liquid separation to remove the precipitate. The solution after the removal of calcium and magnesium is concentrated by evaporation until the Li content is about 15g / L, a large amount of potassium chloride and sodium chloride mixed salt is precipitated, and potassium and sodium mixed salt are separated. Hydrochloric acid is added to the solution after separation of the potassium and sodium mixed salt to adjust the pH of the solution to 5-6. The boron in the solution is precipitated in the form of boric acid and borate, and the boric acid and borate are removed by solid-liquid separation. The boron-containing lithium solution is heated to 90° C., the lithium is precipitated with the sodium carbonate hot solution, and the solid-liquid separation is used...

Embodiment 2

[0021] Add appropriate amount of NaOH and K to the saturated brine solution with high boron content 2 CO 3 , Make a small amount of magnesium and calcium in the solution form Mg(OH) respectively 2 , CaCO 3 Precipitation, solid-liquid separation to remove the precipitate. After removing calcium and magnesium, the solution is evaporated and concentrated to a Li content of 9g / L, a large amount of potassium chloride and sodium chloride mixed salt is precipitated, and the potassium and sodium mixed salt is separated. Add hydrochloric acid to the solution after separating the potassium and sodium mixed salt to adjust the pH of the solution to 2 to 3. The boron in the solution is precipitated as boric acid, and the boric acid is removed by solid-liquid separation. The boron-containing lithium solution is heated to 60° C., the lithium is precipitated with the sodium carbonate hot solution, and the solid-liquid separation is used to obtain crude lithium carbonate. The obtained filtrate i...

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Abstract

The invention relates to a method for preparing lithium carbonate by using high boric bittern saturated solution, which is mainly used in the production of lithium carbonate prepared by using deep marine bittern rich in potassium and comprises the process flow that the high boric bittern saturated solution is prepared into a lithium carbonate product through calcium and magnesium removal, evaporation and concentration, boron removal, lithium settlement and washing. The method has the advantages of simple and feasible process, low equipment investment, low production cost, high yield, better economic and social benefits and the like, and can reclaim boron at the same time; and the high-content boron does not influence the extraction of lithium.

Description

(1) Technical field [0001] The invention relates to a method for preparing lithium carbonate by using a saturated brine brine solution with high boron content, which is mainly used in the production of lithium carbonate prepared from deep sea potassium-rich brine, and belongs to the technical field of salt chemical industry. (2) Background technology [0002] Lithium carbonate is the basic material for the production of secondary lithium salts and metallic lithium, so lithium carbonate is the most critical product in the lithium industry. Currently, there are two main types of raw materials for the production of lithium carbonate. One is lithium-containing solid ores such as spodumene and lepidolite, and the other is lithium-containing brine from surface salt lakes. Solid ore does not contain boron, and the extraction of lithium from surface lithium-containing brine requires the separation of lithium and boron. It has disadvantages such as difficult production processes, large eq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 夏康明唐兵安普伟
Owner DAZHOU HENGCHENG ENERGY GROUP
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