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Method for preparing lithium carbonate for batteries by using low-grade lithium phosphate acidity conversion method

A technology of lithium phosphate and lithium carbonate, applied in lithium carbonate;/acid carbonate and other directions, can solve the problem of low purity of lithium carbonate

Active Publication Date: 2018-10-19
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Technologists have begun to study the conversion of lithium phosphate into lithium carbonate, but the purity of lithium carbonate prepared by conversion of lithium phosphate in the prior art is relatively low, generally industrial grade

Method used

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  • Method for preparing lithium carbonate for batteries by using low-grade lithium phosphate acidity conversion method
  • Method for preparing lithium carbonate for batteries by using low-grade lithium phosphate acidity conversion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Weigh 100g of lithium phosphate and pour it into a 2L beaker, add 600ml of water to stir the slurry, slowly add hydrochloric acid and ferric chloride solution, wherein the molar ratio of phosphate, iron ion and hydrochloric acid is 1:1.0:0.9, stir for 1h, the liquid The alkali adjusts the pH value to 2.8, and continues the reaction at 80°C for 0.5h to complete the crystallization of iron phosphate. Solid-liquid separation to obtain the filtrate, that is, crude lithium chloride solution, the solid is iron phosphate, and the iron phosphate is washed with water and then filtered again to obtain the by-product of iron phosphate. The pH value of the crude lithium chloride solution was adjusted to 3.6 with sodium hydroxide solution, and the iron ions were removed by filtration, and the filtrate was a preliminary purification solution. The preliminary purification solution is obtained by ion exchange to obtain a deeply purified lithium solution. After the sodium carbonate is d...

Embodiment 2

[0111] Weigh 100g of lithium phosphate and pour it into a 2L beaker, add 550ml of water to stir and adjust the slurry, slowly add sulfuric acid and ferrous sulfate solution, wherein the molar ratio of phosphate, ferrous ion and sulfuric acid is 1:0.95:0.5, stir for 1h, The liquid caustic soda adjusts the pH value to 6.2, and continues the reaction at 60°C for 0.5h to complete the precipitation of ferrous phosphate. Solid-liquid separation to obtain the filtrate, that is, crude lithium sulfate solution, the solid is ferrous phosphate, and the ferrous phosphate is washed with water and filtered again to obtain the by-product of ferrous phosphate. The pH value of the crude lithium sulfate solution was adjusted to 9.8 with sodium hydroxide solution, and the ferrous ions were removed by filtration, and the filtrate was a preliminary purification solution. The preliminary purification solution is obtained by ion exchange to obtain a deeply purified lithium solution. After the sodium...

Embodiment 3

[0113] Weigh 100g of lithium phosphate and pour it into a 2L beaker, add 500ml of water to stir the slurry, slowly add hydrochloric acid and calcium chloride solution, wherein the molar ratio of phosphate, calcium ion and hydrochloric acid is 1:1.2:0.8, stir for 0.5h, The liquid caustic soda adjusts the pH value to 5.5, and continues the reaction at room temperature for 0.5 h to complete the crystallization of calcium hydrogen phosphate. Solid-liquid separation to obtain filtrate, that is, crude lithium chloride solution, the solid is calcium hydrogen phosphate, and the calcium hydrogen phosphate is washed with water and filtered again to obtain calcium hydrogen phosphate by-product. The pH value of the crude lithium chloride solution was adjusted to 12 with sodium hydroxide solution, and calcium ions were removed by filtration, and the filtrate was a preliminary purification solution. The preliminary purification solution is obtained by ion exchange to obtain a deeply purifie...

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Abstract

The invention provides a method for preparing lithium carbonate for batteries by using a low-grade lithium phosphate acidity conversion method. The method comprises the following steps: taking solublesalts of iron, ferrous, aluminum and calcium as converters, enabling the converters to sufficiently react with lithium phosphate under a low-acidity condition, and primarily separating lithium ions from phosphate radicals in the lithium phosphate; adjusting the pH value of a composite decomposition reaction product, and precipitating ferric phosphate, ferrous phosphate, aluminum phosphate or calcium hydrophosphate completely; filtering out the precipitate, putting an alkali substance into the filtrate to adjust the pH value of the filtrate, precipitating ferric ions, ferrous ions, aluminum ions or calcium ions in the filtrate to obtain ferric hydroxide, ferrous hydroxide, aluminum hydroxide or calcium hydroxide, and removing the components to obtain a primary purification liquid; performing ion exchange treatment on the primary purification liquid to obtain a deep purification liquid; enabling the deep purification liquid to react with a sodium carbonate solution at 85-100 DEG C, washing, and drying, thereby obtaining battery-grade lithium carbonate.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing lithium carbonate for batteries by an acid conversion method of low-grade lithium phosphate. Background technique [0002] As a basic compound of lithium products, lithium carbonate is widely used in chemical industry, metallurgy, ceramics, medicine, refrigeration, welding, and lithium alloy industries. It is known as "industrial monosodium glutamate". Lithium carbonate is an urgently needed and indispensable raw material in high-tech fields such as lithium-ion batteries, atomic energy, aerospace, military industry, and controlled nuclear fusion. It is an important raw material that is vigorously developed by various countries. Due to the application of lithium-ion batteries in the field of electric vehicles, the demand for lithium carbonate has grown rapidly. According to estimates, by 2018, the global demand for lithium carbonate will reach 263,000 tons, ...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 郭春平文小强周有池王玉香袁德林肖颖奕刘雯雯罗林山普建周新华
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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