Method for preparing basic magnesium carbonate by using combinative alkali system high-salt heavy-ash mother solution

A technology of high-salt heavy ash mother liquor and magnesium carbonate, applied in directions such as magnesium carbonate, can solve the problems of long time consumption, complicated process flow and high production cost, and achieve the effects of short production cycle, simple production process and cost saving.

Inactive Publication Date: 2015-03-25
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method needs to prepare magnesium bicarbonate, and then decompose magnesium bicarbonate to obtain magnesium carbonate. The process is complicated, time-consuming, and production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Dissolve industrial magnesium chloride into a 1mol / L solution and heat it to 80°C, and filter to remove insoluble matter; (2) Take high-salt heavy ash mother liquor and heat it to 50°C, keep the constant temperature for half an hour, then filter to remove calcium ion impurities; (3) the high-salt heavy ash mother liquor after filtering is added in the industrial magnesium chloride solution after filtering to make the two fully react under stirring, then the solution after the reaction is incubated for 2 hours, the add-on of high-salt heavy ash mother liquor and industrial magnesium chloride solution The molar volume ratio is 1.2; (4) The crystalline slurry is filtered, washed with deionized water, and dried at 120° C. to obtain a basic magnesium carbonate product.

[0017] After testing: the content of magnesium oxide in the obtained product is 41.2%.

Embodiment 2

[0019] (1) Dissolve industrial magnesium chloride into a 1.2mol / L solution and heat it to 90°C, then filter to remove the insoluble matter; (2) Take the high-salt heavy ash mother liquor and heat it to 60°C, keep the constant temperature for 40 minutes, then filter to remove calcium ion impurities (3) the high-salt heavy ash mother liquor after filtering is added in the industrial magnesium chloride solution after filtering to make the two fully react, then the solution after the reaction is incubated for 3 hours, the add-on of high-salt heavy ash mother liquor and industrial magnesium chloride solution The molar volume ratio is 1.5; (4) filter the crystalline slurry, wash it with deionized water, and dry it at 130° C. to obtain a basic magnesium carbonate product.

[0020] After testing: the content of magnesium oxide in the obtained product is 41%.

Embodiment 3

[0022] (1) Dissolve industrial magnesium chloride into a 1.45mol / L solution and heat it to 85°C, then filter to remove insoluble matter; (2) Take high-salt heavy ash mother liquor and heat it to 55°C, keep the temperature for 28 minutes, then filter to remove calcium ion impurities (3) the high-salt heavy ash mother liquor after filtering is added in the industrial magnesium chloride solution after filtering to make the two fully react, then the solution after the reaction is incubated for 2.5 hours, the add-on of high-salt heavy ash mother liquor and industrial magnesium chloride solution The molar volume ratio is 1.3; (4) the crystalline slurry is filtered, washed with deionized water, and dried at 125° C. to obtain a basic magnesium carbonate product.

[0023] After testing: the content of magnesium oxide in the obtained product is 41%.

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Abstract

The invention discloses a method for preparing basic magnesium carbonate by using a combinative alkali system high-salt heavy-ash mother solution. The method comprises the following steps: (1) dissolving industrial magnesium chloride into a solution with the concentration of 1-1.45mol/L, heating to 80-90 DEG C, and filtering to remove insoluble substances; (2) heating a high-salt heavy-ash mother solution to 50-60 DEG C, keeping the temperature constant, and then filtering to remove calcium ion impurities; (3) adding the filtered high-salt heavy-ash mother solution into the filtered industrial magnesium chloride solution while stirring for fully reacting, and then keeping the temperature of the solution after reaction for 2-3 hours, wherein the molar volume ratio of the added amounts of the high-salt heavy-ash mother solution and the industrial magnesium chloride solution is 1.2-1.5; and (4) filtering a magma solution, washing by using deionized water at the same time, and drying at 120-130 DEG C to obtain a basic magnesium carbonate product. The magnesium oxide content of the basic magnesium carbonate prepared by the method disclosed by the invention is about 41% and can reach an industrial standard.

Description

technical field [0001] The invention relates to a method for preparing basic magnesium carbonate, in particular to a method for preparing basic magnesium carbonate by using a combined alkali system high-salt heavy ash mother liquor. Background technique [0002] Magnesium basic carbonate has a wide range of uses, mainly used in rubber, enamel, plastic products, paint, pharmaceuticals, electronics, cables and other industries. One, there is a great demand in our country. During the production of heavy ash in the combined soda system, chloride ions in the heavy ash mother liquor continue to accumulate. When the chloride ion content is usually greater than 60g / L, part of the mother liquor needs to be discharged to maintain system balance and ensure qualified products. The main components of the discharged high-salt heavy ash mother liquor are sodium carbonate and sodium chloride. Therefore, the preparation of magnesium carbonate by using the high-salt heavy ash mother liquor a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24
CPCC01F5/24
Inventor 王松晓庞栓林李治水谢智勇
Owner TIANJIN BOHUA YONGLI CHEM IND
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