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Method for producing magnesium oxide with co-production of ammonium chloride by taking magnesium carbonate hydrate as intermediate

A technology of magnesium carbonate and hydrate, applied in the directions of magnesium oxide, magnesium carbonate, ammonium halide, etc., can solve the problems of high cost and large amount of ammonium bicarbonate in production and consumption, and achieve the effect of increasing consumption and high purity

Inactive Publication Date: 2011-03-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0028] In this method, the carbon dioxide utilization rate in ammonium bicarbonate is only 50%, and the consumption of ammonium bicarbonate in production is large, and the cost is high

Method used

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  • Method for producing magnesium oxide with co-production of ammonium chloride by taking magnesium carbonate hydrate as intermediate
  • Method for producing magnesium oxide with co-production of ammonium chloride by taking magnesium carbonate hydrate as intermediate
  • Method for producing magnesium oxide with co-production of ammonium chloride by taking magnesium carbonate hydrate as intermediate

Examples

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Effect test

Embodiment 1

[0069] See figure 1 .

[0070] 1) Prepare 2000ml of magnesium chloride solution with water using the anhydrous magnesium chloride of sponge titanium by-product, wherein the concentration of magnesium chloride is 3mol / L; prepare 2000ml of ammonium bicarbonate solution with water, and the concentration of ammonium bicarbonate is 3mol / L; pass into the ammonium bicarbonate solution Ammonia, the molar ratio of ammonium bicarbonate to ammonia is 2:1.

[0071] 2) The magnesium chloride solution prepared in step 1) is passed into the crystallization reactor at a certain flow rate, and the ammonium bicarbonate solution after absorbing ammonia gas is passed into the magnesium chloride solution, and the reaction crystallization is obtained after reaction crystallization at a reaction temperature of 20°C for 1 hour. Serum I. The volume of the ammonium bicarbonate solution introduced after absorbing ammonia is 0.6 times the volume of the magnesium chloride solution, and the mol ratio of ...

Embodiment 2

[0076] See figure 1 .

[0077] 1) Use seawater brine magnesium chloride to prepare 2000ml of magnesium chloride solution with pure water, wherein the concentration of magnesium chloride is 5mol / L; prepare 2000ml of ammonium bicarbonate solution with pure water, and the concentration of ammonium bicarbonate is 5mol / L; feed ammonia into the ammonium bicarbonate solution Gas, the molar ratio of ammonium bicarbonate to ammonia is 2:1.

[0078] 2) The magnesium chloride solution prepared in step 1) is passed into the crystallization reactor at a certain flow rate, and the ammonium bicarbonate solution after absorbing ammonia gas is passed into the magnesium chloride solution, and the reaction temperature is 90 ° C. After crystallization for 6 hours, the obtained Serum I. The volume of the ammonium bicarbonate solution after absorbing the ammonia that is introduced is 0.4 times of the magnesium chloride solution volume, and the mol ratio of ammonium bicarbonate and magnesium chlor...

Embodiment 3

[0083] See figure 1 .

[0084] 1) Use salt lake brine to add pure water to prepare 2000ml of magnesium chloride solution, wherein the concentration of magnesium chloride is 4mol / L; prepare 2000ml of ammonium bicarbonate solution with pure water, and the concentration of ammonium bicarbonate is 4mol / L; feed ammonia into the ammonium bicarbonate solution , the molar ratio of ammonium bicarbonate to ammonia is 2:1.

[0085] 2) The magnesium chloride solution prepared in step 1) is passed into the crystallization reactor at a certain flow rate, and the ammonium bicarbonate solution after absorbing ammonia gas is passed into the magnesium chloride solution, and the reaction temperature is 80° C. After crystallization for 4 hours, the obtained Slurry I; The volume of the ammonium bicarbonate solution after absorbing the ammonia that passes through is 0.5 times of the magnesium chloride solution volume, and the molar concentration ratio of ammonium bicarbonate and magnesium chloride...

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Abstract

The invention belongs to the field of inorganic salt chemical industry and fertilizer production, particularly relates to a method for producing magnesium oxide with co-production of ammonium chloride by taking magnesium carbonate hydrate as an intermediate. The method comprises the following steps of: with anhydrous magnesium chloride or bittern magnesium chloride as a raw material and with ammonia and ammonium bicarbonate as precipitating agents, obtaining the magnesium carbonate hydrate intermediate (the purity reaches 97-99 percent) with favorable crystal form by controlling process conditions; calcining the obtained magnesium carbonate hydrate intermediate to prepare magnesium oxide (the purity reaches 95-99 percent); adding salt to mother liquor enriched with ammonium salts and evaporating, salting out and cooling to separate out ammonium chloride, and filtering to obtain the ammonium chloride, wherein the mother liquor is circularly taken as a raw material. The method aims at producing needle-shaped or spherical magnesium carbonate hydrate by utilizing rich magnesium chloride brine from salt lakes, or magnesium chloride brine from seawater, or anhydrous magnesium chloride used for producing titanium sponge by-products, and other magnesium salt materials, thereby preparing high-purity magnesium oxide with the simultaneous co-production of ammonium chloride fertilizer. The method of the invention has strong maneuverability and is easy to realize industrialization.

Description

technical field [0001] The invention belongs to the field of inorganic salt chemical industry and chemical fertilizer production, in particular to a method of using ammonia gas, ammonium bicarbonate and anhydrous magnesium chloride or brine magnesium chloride as raw materials to prepare magnesium carbonate hydrate through precipitation, and to produce high-purity magnesium oxide from magnesium carbonate hydrate A method for parallel production of ammonium chloride fertilizer. Background technique [0002] The production and demand of magnesium compounds in my country rank first in the world. There are hundreds of magnesium compound products, among which magnesium carbonate hydrate and magnesium oxide series products attract the most attention. Magnesium carbonate hydrate and magnesium oxide are used in many fields such as metallurgy, refractory materials, rubber industry, chemical building materials, agriculture, food, medicine, environmental protection, aerospace, light in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/02C01F5/06C01F5/24C01C1/16
Inventor 李志宝王道广程文婷
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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