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Process for producing lithium carbonate magnesium oxide and hydrogen chloride by high magnesium lithium-containing halogen water

A lithium carbonate and magnesium oxide technology, applied in the field of salt chemical industry, can solve the problems of high production cost and low recovery rate, achieve good economic and social benefits, and reduce production costs.

Active Publication Date: 2006-01-25
青海中信国安锂业发展有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Using high-magnesium lithium-containing brine to produce lithium carbonate, the separation process of magnesium and lithium has always been a worldwide problem. Traditional methods include precipitation and extraction. The disadvantage of precipitation is that the recovery rate is lower than 30%, and the production cost is high. Extraction There is also the deficiency of high production cost

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  • Process for producing lithium carbonate magnesium oxide and hydrogen chloride by high magnesium lithium-containing halogen water

Examples

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Effect test

Embodiment 1

[0007] Example 1: Using high-magnesium lithium-containing brine as raw material, after precipitation removes insoluble matter in the brine, the feed temperature of the spray drying process is room temperature, the inlet air temperature of the spray drying tower is 450°C, and the outlet air temperature is 240°C The conditions are dry, and the lithium-containing magnesium chloride solid is produced. During calcination, a rotary calciner is used to calcinate at a calcination temperature of 554 ° C for 2.5 hours to obtain a solid lithium-containing magnesia, wherein the pyrolysis rate of magnesium chloride can reach 96%, and the recovery rate of lithium can reach 96.5%, washed 3 times countercurrently with fresh water, the filter cake was dried and dehydrated to obtain high-purity magnesium oxide with a MgO content of 99%, and the washing liquid was evaporated and concentrated into brine after removing impurities + When it is 14g / l, after removing the precipitate, add the concentra...

Embodiment 2

[0008] Example 2: Using high-magnesium lithium-containing brine as a raw material, after precipitation and removal of water-insoluble matter in the brine, the feed temperature of the spray drying is 130°C, the inlet air temperature of the spray drying tower is 200°C, and the outlet air temperature is 150°C. Dry under low temperature to obtain lithium-containing magnesium chloride solid. When calcining, use a swirling flow dynamic calciner to calcinate at 1200°C for 0.5 seconds to obtain solid lithium-containing magnesium oxide, then wash it countercurrently with fresh water for 6 times, and the filter cake is obtained by drying and removing water. A high-purity magnesium oxide product with a MgO content of 99.4%, the washing liquid is evaporated and concentrated into brine after removing impurities + When it is 21g / l, remove the precipitate, add excess soda ash to the concentrated solution to precipitate lithium carbonate, and finally separate the precipitated solid to obtain l...

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Abstract

A process for preparing lithium carbonate, magnesium oxide and hydrochloric acid from the Li-contained high-Mg bittern includes such steps as spray drying, calcining, water washing evaporation concentrating, depositing to obtain lithium carbonate, absorbing the gas mixture generated during calcining by hydrochloric acid to obtain industrial hydrochloric acid, and drying the filtered cake generated after water washing to obtain high-purity magnesium oxide. The technological parameters for said steps are also disclosed.

Description

1. Technical fields: [0001] The invention belongs to the technical field of salt chemical industry, and in particular relates to a method for producing lithium carbonate, magnesium oxide and hydrochloric acid using high-magnesium lithium-containing brine. 2. Technical background: [0002] Using high-magnesium lithium-containing brine to produce lithium carbonate, the separation process of magnesium and lithium has always been a worldwide problem. Traditional methods include precipitation, extraction, etc. The disadvantages of the precipitation method are that the recovery rate is less than 30% and the production cost is high. The extraction method There is also the disadvantage of high production costs. 3. Contents of the invention: [0003] The object of the present invention is to design a method for producing lithium carbonate, magnesium oxide and hydrochloric acid from high magnesium-containing lithium brine, which is designed to address the shortcomings of the prior a...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01B7/01C01F5/02
Inventor 杨建元夏康明
Owner 青海中信国安锂业发展有限公司
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