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Novel method for producing lithium carbonate and lithium hydroxide

A technology of lithium hydroxide and lithium carbonate, which is applied in the direction of lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., which can solve the problems of affecting product quality, complicated mother liquor treatment, and high cost consumption , to achieve the effect of optimizing the production process, stable product quality and low cost

Inactive Publication Date: 2011-07-06
屈俊鸿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the mother liquor is circulated in the production system, and the impurities are enriched, which affects the product quality; the treatment of the mother liquor is more complicated and the cost is high.

Method used

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Effect test

Embodiment approach 1

[0017] Embodiment 1, a new method for producing lithium carbonate and lithium hydroxide, the steps are sequentially roasting spodumene concentrate, producing lithium sulfate solution, producing lithium carbonate mother liquor, and producing lithium hydroxide;

[0018] a. Spodumene concentrate: Roasted at 1050-1100°C, cooled, finely ground, acidified and roasted at 250-300°C by adding 98% concentrated sulfuric acid, then subjected to wet extraction to remove impurities such as calcium and magnesium, evaporated and concentrated , Obtain lithium sulfate completion liquid after press filtration;

[0019] b. Lithium sulfate finished solution: Lithium sulfate finished solution is subjected to lithium sinking, and after separation, lithium sinking mother liquor and crude lithium carbonate are obtained; lithium sinking mother liquor is filtered to obtain lithium carbonate mother liquor, and crude lithium carbonate is stirred and washed, separated and dried to obtain finished carbonate ...

Embodiment approach 2

[0022] Embodiment 2, a. Spodumene concentrate: Roasted at 1050-1100°C, cooled, finely ground, added 98% concentrated sulfuric acid, acidified and roasted at 250-300°C, and then subjected to wet extraction to remove calcium, magnesium, etc. Impurities, after evaporating and concentrating, press-filtering, obtain lithium sulfate completion liquid;

[0023] b. Lithium sulfate finished solution: Lithium sulfate finished solution is subjected to lithium sinking, and after separation, lithium sinking mother liquor and crude lithium carbonate are obtained; lithium sinking mother liquor is filtered to obtain lithium carbonate mother liquor, and crude lithium carbonate is stirred and washed, separated and dried to obtain finished carbonate lithium;

[0024] c. lithium carbonate mother liquor: in lithium carbonate mother liquor, add barium hydroxide, obtain lithium hydroxide dilute solution;

[0025] d. lithium hydroxide; the dilute lithium hydroxide solution obtained after the caustic...

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Abstract

The invention relates to a novel method for producing lithium carbonate and lithium hydroxide, which belongs to the technical field of production of lithium salts. The method comprises the following steps of: baking spodumene concentrate; preparing a lithium sulfate solution; preparing lithium carbonate mother liquor; and preparing lithium hydroxide, wherein the lithium hydroxide can also be obtained by adding barium hydroxide into the lithium carbonate mother liquor. The method has the advantages that: lime is added into a lithium carbonate sinker mother liquor to produce the lithium hydroxide by causticizing and transforming, and the production of lithium carbonate is combined with the production of the lithium hydroxide, so that a process flow is simplified, investment and production costs are lowered, a production process is more flexible to regulate and control, and the quality of a lithium carbonate product is more stable. By adopting the method, the mother liquor of lithium carbonate is easier to treat, impurities in the lithium hydroxide mother liquor are easy to treat, and the product quality is not influenced.

Description

technical field [0001] The invention relates to a new method for producing lithium carbonate and lithium hydroxide, belonging to the technical field of lithium salt production. Background technique [0002] Lithium carbonate (Li2CO3) is used to prepare various lithium compounds, metal lithium and its isotopes; it is also used to prepare catalysts for chemical reactions. There are also applications in the semiconductor, ceramics, television, medicine and atomic energy industries. [0003] Lithium hydroxide (LiOH) is a caustic alkali. The solid is white crystal powder or small particles. It belongs to tetragonal crystal lithium hydroxide. It can be used as a developing agent and lubricating oil for spectral analysis. [0004] In China, the two products of lithium carbonate and lithium hydroxide are produced by two independent methods (the method of producing lithium carbonate is to obtain lithium sulfate from spodumene ore through smelting and wet extraction. solution, and t...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01D15/02
Inventor 屈俊鸿
Owner 屈俊鸿
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