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Method for preparing high-purity magnesium oxide from nesquehonite by carbon-ammonia recycle method

A technology of magnesium carbonate trihydrate and magnesium oxide, applied in magnesium oxide and other directions, can solve the problems of large washing water consumption, high preparation temperature, poor filtration performance, etc., and achieve the effects of saving energy consumption, simple method and reducing water consumption.

Inactive Publication Date: 2011-03-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium hydroxide intermediates are easy to agglomerate, have poor filtration performance, and require a large amount of washing water
And the preparation temperature of basic magnesium carbonate intermediate is high, so energy consumption is high

Method used

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  • Method for preparing high-purity magnesium oxide from nesquehonite by carbon-ammonia recycle method
  • Method for preparing high-purity magnesium oxide from nesquehonite by carbon-ammonia recycle method

Examples

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Embodiment 1

[0030] For the specific process flow of this embodiment, please refer to figure 1 .

[0031] (1) prepare magnesium carbonate trihydrate intermediate

[0032] The brine magnesium chloride is configured as a magnesium chloride solution with a concentration of 0.5 mol / L, and added to the reaction crystallization kettle, the temperature is controlled at 20°C, and ammonia and carbon dioxide are fed into the reaction crystallization kettle under stirring conditions. The equivalent ratio of magnesium and ammonia is 1:2, the flow rate of ammonia is 0.5 liter / min, and the flow rate of carbon dioxide is 0.25 liter / min. Stop feeding when the concentration of magnesium chloride in the solution reaches 0.01mol / L, and continue to stir for 30 minutes. The filtered solid is an intermediate of magnesium carbonate trihydrate. The filtrate obtained after filtration is then used as raw material for ammonia distillation.

[0033] (2) Filtration and washing of magnesium carbonate trihydrate

...

Embodiment 2

[0040] For the specific process flow of this embodiment, please refer to figure 1 .

[0041] (1) prepare magnesium carbonate trihydrate intermediate

[0042] The brine magnesium chloride is configured into a magnesium chloride solution with a concentration of 4.5 mol / L, and added to the reaction crystallization kettle, the temperature is controlled at 40°C, and ammonia and carbon dioxide are introduced into the reaction crystallization kettle under stirring conditions. The equivalent ratio of magnesium and ammonia is 1:2, the flow rate of ammonia is 1.5 liters / minute, and the flow rate of carbon dioxide is 1.0 liters / minute. Stop feeding when the concentration of magnesium chloride in the solution reaches 0.05mol / L, and continue to stir for 120 minutes. The filtered solid is an intermediate of magnesium carbonate trihydrate. The filtrate obtained after filtration is then used as raw material for ammonia distillation.

[0043] (2) Filtration and washing of magnesium carbona...

Embodiment 3

[0050] For the specific process flow of this embodiment, please refer to figure 1 .

[0051] (1) prepare magnesium carbonate trihydrate intermediate

[0052] The brine magnesium chloride is configured as a magnesium chloride solution with a concentration of 3 mol / L, and added to the reaction crystallization kettle, the temperature is controlled at 30°C, and ammonia and carbon dioxide are introduced into the reaction crystallization kettle under stirring conditions. The equivalent ratio of magnesium and ammonia is 1:2, the flow rate of ammonia is 1.0 liter / min, and the flow rate of carbon dioxide is 0.75 liter / min. Stop feeding when the concentration of magnesium chloride in the solution reaches 0mol / L, and continue to stir for 90 minutes. The filtered solid is an intermediate of magnesium carbonate trihydrate. The filtrate obtained after filtration is then used as raw material for ammonia distillation.

[0053] (2) Filtration and washing of magnesium carbonate trihydrate ...

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Abstract

The invention discloses a method for preparing high-purity magnesium oxide from nesquehonite by a carbon-ammonia recycle method, belonging to the field of chemical production of inorganic salts. The method comprises the following steps of: with brine magnesium chloride as a raw material, preparing a nesquehonite intermediate which has good crystalline form and is easy to filter by using the carbon-ammonia recycle method; further calcining to produce high-purity magnesium oxide and simultaneously realize the recycle of carbon dioxide and ammonia, wherein the carbon dioxide is generated in the process of calcining the nesquehonite, and the ammonia is obtained by evaporating the ammonium chloride mother liquid and used for depositing magnesium. The method has the advantages of fully solving the problem of greenhouse effect and environmental pollution caused by ammonium chloride emission in the process of producing magnesium oxide and realizing high-value utilization of sea salt magnesium chloride resources. The method disclosed in the invention has high operability and is easy for industrialized production.

Description

technical field [0001] The invention belongs to the field of inorganic salt chemical production, and in particular relates to a method for producing high-purity magnesium oxide through magnesium carbonate trihydrate through an ammonium bicarbonate circulation method. Background technique [0002] my country is rich in brine magnesium resources, and a large amount of magnesium mainly exists in seawater, salt lake water and well brine in the form of chloride. After extracting sodium and potassium from brine, an aqueous solution rich in magnesium chloride or magnesium chloride hydrate can be obtained. The use of this magnesium resource can produce high value-added magnesium oxide products. [0003] As an important inorganic chemical product, high-purity magnesium oxide is widely used in the surface coating of silicon steel sheet, rubber, paint, filler in paper production, steel ball polishing agent, plasticizer for glass fiber reinforced plastic, etc. The annual demand gap fo...

Claims

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Application Information

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IPC IPC(8): C01F5/02
Inventor 李志宝王均凤
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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