Method for preparing trihydrated magnesium carbonate from magnesium chloride-containing bittern by using ammonium carbonate

A technology of magnesium carbonate trihydrate and magnesium chloride, which is applied in the field of salt chemical industry, can solve the problems of difficult control of the reaction process and unstable product quality, and achieve the effect of optimizing the precipitation and crystallization process, good crystal form, and reducing the adsorption of impurities

Inactive Publication Date: 2008-09-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] Carbon dioxide and ammonia as raw materials are relatively cheap and have significant economic benefits, but this reaction involves a gas-liquid-solid three-phase reaction, the reaction process is difficult to control, and the product quality is unstable

Method used

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  • Method for preparing trihydrated magnesium carbonate from magnesium chloride-containing bittern by using ammonium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The raw brine containing magnesium chloride is naturally evaporated in the salt pan to obtain crystallization mother liquor containing magnesium chloride, and the refined saturated magnesium chloride brine with high magnesium content is obtained through precipitation and filtering impurities.

[0046] Add saturated magnesium chloride brine to the magnesium carbonate crystallizer, add deionized water to the brine containing magnesium chloride, and prepare 1000ml of magnesium chloride reaction bottom solution with a concentration of 1mol / L, heat to keep the solution at 30°C, and mix 1000ml with a concentration of 1.1 The mol / L ammonium carbonate solution was added slowly, and the adding speed was controlled so that the pH value of the reaction solution was between 8.3 and 8.5. After the reaction, continue to stir for 2 hours, and age to generate needle-shaped magnesium carbonate trihydrate precipitates. Wash the above precipitate with deionized water at 30°C, filter and d...

Embodiment 2

[0048] The raw brine containing magnesium chloride is naturally evaporated in the salt pan to obtain crystallization mother liquor containing magnesium chloride, and the refined saturated magnesium chloride brine with high magnesium content is obtained through precipitation and filtering impurities.

[0049] Add saturated magnesium chloride brine to the magnesium carbonate crystallizer, add deionized water to the brine containing magnesium chloride, and prepare 1000ml of magnesium chloride reaction bottom liquid with a concentration of 0.5mol / L, heat to keep the solution at 30°C, and dissolve 53g of ammonium carbonate under stirring The solid powder is slowly added therein, and the adding speed is controlled so that the pH value of the reaction solution is between 7.5 and 9.0. After the reaction was completed, the stirring was continued for 6 hours, and the needle-shaped magnesium carbonate trihydrate precipitate was formed by aging. Wash the above precipitate with deionized w...

Embodiment 3

[0051] The raw brine containing magnesium chloride is naturally evaporated in the salt pan to obtain crystallization mother liquor containing magnesium chloride, and the refined saturated magnesium chloride brine with high magnesium content is obtained through precipitation and filtering impurities.

[0052] Add saturated magnesium chloride brine to the magnesium carbonate crystallizer, add deionized water to the brine containing magnesium chloride, and prepare 1000ml of magnesium chloride reaction bottom solution with a concentration of 2mol / L, heat to keep the solution at 25°C, and mix 2100ml with a concentration of 1mol under stirring. / L of ammonium carbonate solution made of ammonium bicarbonate and ammonia water is slowly added to the crystallizer, and the addition speed is controlled so that the pH value of the reaction solution is between 8.3 and 8.5. After the reaction was completed, the stirring was continued for 6 hours, and the needle-shaped magnesium carbonate trih...

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Abstract

The invention belongs to the salt chemical industry technical field, in particular to a method for producing trihydrated magnesium carbonates and ammonium chlorides from magnesium chloride containing brine water by utilizing ammonium carbonates. The invention adopts the technical proposal that: the trihydrated magnesium carbonates are produced by taking the magnesium chloride containing brine water with high concentration as materials and the ammonium carbonates as precipitating agents. The trihydrated magnesium carbonate crystals with desirable shapes can be obtained by controlling technological conditions, so that the adsorption of impurities is reduced, and the products have relatively high purity; the trihydrated magnesium carbonate crystals obtained by reaction are big in volume and easy to filter, thereby lowering the energy consumption of filtering; moreover, the method of the invention has the advantages of strong operability, easy realization of industrialization, good economic benefits of byproducts and no environmental pollution, and realizes the comprehensive utilization of salt lake resources.

Description

technical field [0001] The invention belongs to the field of salt chemical industry, in particular to a method for producing magnesium carbonate trihydrate and ammonium chloride from brine containing magnesium chloride by using ammonium carbonate. technical background [0002] my country has vast salt lake resources in Qinghai, Tibet, Xinjiang and other regions, and the salt lakes are rich in potassium, magnesium, lithium and other resources. For example, the Chaerhan area of ​​Qinghai mainly produces potash fertilizers, and a large amount of brine containing magnesium chloride and lithium chloride is discharged during the potash fertilizer production process. This part of brine has not been effectively utilized, resulting in the waste of magnesium and lithium resources, and also the depletion of potassium resources and serious environmental pollution. With the development of the national economy, the demand for magnesium products in the domestic market is also increasing, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24
Inventor 李志宝王勇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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