Method for recovering lithium in mother liquor of process for producing lithium carbonate from spodumene through sulfuric acid process

A technology of a process mother liquor and a recovery method, applied in the directions of lithium sulfate/sulfite, lithium carbonate;/acid carbonate, etc., to achieve the effects of ensuring quality, improving total yield, and improving yield

Inactive Publication Date: 2014-08-06
甘孜州泸兴锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] The present invention produces secondary product lithium carbonate, first-grade product lithium carbonate yield low in order to solve prior art to the recovery method of lithium in lithium carbonate mother liquor, soluble impurity (SO in mother liquor) 4 2- 、K + , Cl - ) returns to the problem that the system affects product quality, and provides a method for recovering lithium in the lithium carbonate mother liquor produced by the spodumene sulfuric acid method, which solves the problems of lithium recovery and product quality in the lithium carbonate mother liquor, and improves the quality of the first-grade product. The yield of lithium carbonate prevents soluble impurities (SO 4 2- 、K + , Cl - ) back to the system to ensure the quality of the product

Method used

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Embodiment 1

[0057] Use 2m 3 The enamel reaction kettle takes 1m 3 Lithium carbonate concentrated mother liquor, Li 2 O concentration is 25g / L, pours into heating reactor, puts into stearic acid (acid value of stearic acid is counted as 207) 476kg, after stearic acid melts, adds liquid caustic soda 50% sodium hydroxide 133.8kg or 50% hydrogen Sodium oxide 87.5L, control the reaction temperature to be greater than 95 degrees, stir for 30 minutes, and let it stand for 10 minutes; when the lithium stearate is completely floating on the water surface, discharge all the liquid phase from the bottom valve of the reaction kettle, in order to prevent the lithium stearate from being discharged , you can add a layer of screen on the bottom valve, close the bottom valve; heat water 1m 3 , stir and wash for 10 minutes, drain the washing water to the washing water storage tank after standing still, close the bottom valve; then add hot water 1m 3 , add 50L of concentrated sulfuric acid, and continue ...

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Abstract

The invention discloses a method for recovering lithium in mother liquor of a process for producing lithium carbonate from spodumene through a sulfuric acid process. The method is used for solving the problems that second-grade lithium carbonate and first-grade lithium carbonate are low in yield, and soluble impurities (SO4<2->, K<+> and Cl<->) in the mother liquor return to the system to affect the product quality in a method for recovering lithium in the lithium carbonate mother liquor in the prior art. The method disclosed by the invention mainly comprises the steps: concentrating lithium carbonate mother liquor; reacting to generate lithium stearate and separating the lithium stearate; and reacting to produce lithium sulfate and conveying the lithium sulfate to a lithium sulfate liquid storage tank. The method solves the problems of recovery of lithium in the lithium carbonate mother liquor and product quality, increases the yield of first-grade lithium carbonate, prevents the soluble impurities (SO4<2->, K<+> and Cl<->) from returning to the system and guarantees the product quality.

Description

technical field [0001] The invention belongs to the technical field of production of lithium carbonate by a mining method, and in particular relates to a method for recovering lithium in a mother liquor of a process for producing lithium carbonate by a spodumene sulfuric acid method. Background technique [0002] At present, the production process of lithium carbonate by mining method mainly includes processes such as roasting, ball milling, acidification, leaching, filtration, smelting, freezing, evaporation and cooling crystallization and separation. [0003] For example, the patent of invention with application number 201310243237.8 discloses a method for producing high-purity lithium carbonate from lithium concentrate. The method comprises the following steps: [0004] (1) Steps for preparing acid clinker: Lithium concentrate is first calcined in a rotary kiln at 1000-1150°C and transformed into roasted material, then the roasted material is cooled to 80-145°C by a coole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01D15/06
Inventor 刘元礼
Owner 甘孜州泸兴锂业有限公司
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