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Process for producing high purity magnesate, lithium carbonate, hydrogen chloride and ammonium chloride

A technology of ammonium chloride and lithium carbonate, applied in the field of salt chemical industry, can solve the problem of lack of complete sets of technologies for comprehensive utilization of salt lake resources

Active Publication Date: 2007-10-17
青海中信国安锂业发展有限公司
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  • Abstract
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Problems solved by technology

[0002] The comprehensive utilization of high-magnesium lithium-containing brine has always been a major problem in the development of salt lake brine. The research content of relevant domestic units is limited to single element extraction and utilization technologies, such as the use of lithium resources in brine to produce lithium carbonate and the use of magnesium resources in brine to produce metals Magnesium and magnesium salts, and some results have been achieved, but a complete set of technologies for the comprehensive utilization of all useful elements in salt lake resources is lacking

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  • Process for producing high purity magnesate, lithium carbonate, hydrogen chloride and ammonium chloride

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Embodiment 2

[0008] Embodiment two: with high magnesium lithium-containing brine as raw material, Mg in brine 2+ The content is 80g / L, the concentration of ammonia water is 9.0mol / L, the reaction temperature of ammoniation is about 85℃, and the raw material ratio is Mg in high-magnesium-containing lithium-containing brine. 2+ : NH in ammonia water 3 ·H 2 O mass ratio is 1: 1.8, the reaction time is 1.5 hours, the pH value of the filtrate one is adjusted to 7 with hydrochloric acid in the water removal by evaporation, the control end point solution density of the water removal by evaporation of the solution is solid-liquid separation when the density is 1.300, the volatilization temperature of ammonium chloride volatilization is 180° C., the calcination temperature of calcination is 1200° C., and the calcination time is 0.5 seconds. The five products of Example 1 can be obtained by implementing the process flow of FIG. 1 .

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Abstract

A process for preparing high-purity Mg salt, lithium carbonate, hydrochloric acid and ammonium chloride from Li-contained high-Mg bittern includes such steps as ammoniation reaction, filter, evaporating water, filtering again, volatilizing ammonium chloride, calcining, washing-dewatering, drying to obtain magnesium oxide, washing and drying the filtered cake generated by the first filtering to obtain magnesium hydroxide, depositing and filtering the washing liquid generated by washing-dewatering to obtain lithium carbonate, and condensing and absorbing the tail gas generated in calcining to obtain hydrochloric acid.

Description

1. Technical field [0001] The invention relates to a process method for producing high-purity magnesium salt, lithium carbonate, hydrochloric acid and ammonium chloride by using high-magnesium lithium-containing brine as a raw material and adding ammonia as raw material, and belongs to the technical field of salt chemical industry. 2. Technical background [0002] The comprehensive utilization of high-magnesium lithium-containing brine has always been a major problem in the development of salt lake brine. The research content of relevant domestic units is limited to single element extraction and utilization technologies, such as using lithium resources in brine to produce lithium carbonate, and using magnesium resources in brine to produce metal Magnesium and magnesium salts, and some achievements have been made, but there is a lack of a complete set of technologies for comprehensive utilization of all useful elements in salt lake resources. 3. Content of the Invention [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/14C01D15/08C01B7/01C01C1/16
Inventor 杨建元夏康明
Owner 青海中信国安锂业发展有限公司