Preparation method of magnesium oxide by using bittern and carbonate

A carbonate and magnesium oxide technology, applied in magnesium oxide and other directions, can solve the problems of high free ammonium concentration, poor operating environment, environmental pollution, etc., and achieve the effects of low energy consumption, easy operation, easy manufacturing and processing

Inactive Publication Date: 2010-07-14
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The method reacts at a lower reactant concentration to obtain magnesium hydroxide with larger particles, but the lower concentration will cause a lower yield, and at the same time, the concentration of free ammonium in the reaction system is high, causing problems such as poor operating environment and environmental pollution.

Method used

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  • Preparation method of magnesium oxide by using bittern and carbonate
  • Preparation method of magnesium oxide by using bittern and carbonate
  • Preparation method of magnesium oxide by using bittern and carbonate

Examples

Experimental program
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Embodiment 1

[0053] First, the bittern containing magnesium sulfate is evaporated and crystallized to remove the sodium salt and potassium salt, and deionized water is added to the bittern that removes the sodium salt and potassium salt to prepare 1000ml of magnesium sulfate with a concentration of 1mol / L. Bottom liquid, heated to keep the solution at 30°C, 1000ml of sodium carbonate solution with a concentration of 1.1mol / L was slowly added therein under stirring, and the adding speed was controlled to keep the pH value of the reaction solution at 8.5. After the reaction, continue to stir at room temperature for 2 hours, and age to generate needle-shaped magnesium carbonate trihydrate precipitates. The above precipitate is filtered, washed and dried to obtain a magnesium carbonate trihydrate product, which is calcined at 700° C. for 2 hours to obtain magnesium oxide whiskers. Mg in the resulting filtrate 2+ The content is 1.24g / L, the filtrate is evaporated, concentrated, crystallized, f...

Embodiment 2

[0055] First, the bittern containing magnesium sulfate is evaporated and crystallized to remove the sodium salt and potassium salt, and deionized water is added to the bittern that removes the sodium salt and potassium salt to prepare 1000ml of magnesium chloride with a concentration of 0.5mol / L. The bottom solution was heated to keep the solution at 30°C, and 48g of sodium carbonate solid powder was slowly added therein under stirring, and the addition rate was controlled to keep the pH value of the reaction solution at 9.0. After the reaction was completed, the stirring was continued at room temperature for 6 hours, and the needle-shaped magnesium carbonate trihydrate precipitate was formed by aging. The above precipitate was filtered and dried to obtain a magnesium carbonate trihydrate product, which was calcined at 700° C. for 3 hours to obtain magnesium oxide whiskers. Mg in the resulting filtrate 2+ The content is 1.10g / L, the filtrate is evaporated, concentrated, cryst...

Embodiment 3

[0057] First, the bittern containing magnesium sulfate is evaporated and crystallized to remove the sodium salt and potassium salt, and deionized water is added to the bittern that has removed the sodium salt and potassium salt, and the concentrations of magnesium sulfate and magnesium chloride are respectively 2mol / L. 1000ml of the reaction bottom solution was heated to keep the solution at 25°C, and 2100ml of sodium carbonate solution with a concentration of 1mol / L was slowly added therein under stirring, and the addition rate was controlled so that the pH value of the reaction solution was 8.3. After the reaction was completed, the stirring was continued at room temperature for 4 hours, and the needle-shaped magnesium carbonate trihydrate precipitate was formed by aging. The above precipitate was filtered and dried to obtain a magnesium carbonate trihydrate product, which was calcined at 700° C. for 4 hours to obtain magnesium oxide whiskers. Mg in the resulting filtrate 2...

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Abstract

The present invention provides a preparation method of magnesium oxide by using bittern and carbonate, comprising the following steps: a. evaporating the bittern for crystallization to remove the sodium salt and sylvine; b. adding a precipitant into the processed bittern at the temperature of 10 to 50 DEG C, reacting at the temperature to obtain the bittern containing the sediment of trihydrate magnesium carbonate, keeping the pH value of 7.0 to 10.0 during the addition of the precipitant, the molar ratio of the precipitant and the magnesium ions is between 1:1.1 to 1:1.2, and the precipitant is carbonate solution or carbonate solid; c. filtering the obtained bittern containing the sediment of trihydrate magnesium carbonate; d. calcining the solid sediment of step c to obtain the magnesium oxide. By the process of the invention, the solid sediment of trihydrate magnesium carbonate obtained in step c has the purity of 99.0%, and the magnesium oxide obtained in step d has the purity of 99.4%.

Description

technical field [0001] The invention relates to a method for preparing magnesium oxide by utilizing bittern and carbonate. Background technique [0002] There are as many as several hundred kinds of magnesium compound products, among which magnesium oxide series products have the largest demand and the most varieties. Magnesium oxide can be widely used in papermaking, chemical industry, rubber, medicine, animal husbandry, refractory materials, metal magnesium extraction, construction, military industry and other fields. The 2006 annual world magnesia production statistics show that my country's magnesia production capacity ranks first in the world, with an annual output of about 3.23 million tons. At present, the domestic production of high-purity magnesia uses the method of calcining magnesite, but this method can only produce magnesia with a purity of about 95%, rarely reaching more than 99%, and energy consumption and environmental protection are not up to standard. MgC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06
Inventor 李志宝祁红波邵平平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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