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Method for producing active magnesium oxide from spice waste residues

A technology of active magnesium oxide and magnesium hydroxide, applied in magnesium oxide, magnesium carbonate and other directions, can solve the problems of large water and thermal energy consumption, high energy consumption, low solubility, etc., achieve significant economic and ecological benefits, and promote the effective use of resources. The effect of utilization and ecological environment protection

Inactive Publication Date: 2021-03-26
ANHUI JINGHE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the low solubility of magnesium bicarbonate in the pyrolysis process of heavy magnesium water in the above production process (equivalent to containing magnesium oxide at 6-12g / l), it is necessary to pyrolyze 50-90m 3 Heavy magnesium water, because this reaction is an endothermic reaction, and the pyrolysis temperature needs to be between 95 and 105, it needs to consume a lot of water and heat energy
In addition, the light magnesium carbonate filter cake after heavy magnesium hydrolysis, filtration and separation has a water content of 75-80%, that is, the production of 1 ton of light magnesium carbonate needs to remove 3 tons of water, a large amount of evaporated water, and high energy consumption. There are obvious flaws

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take the basic magnesium chloride waste residue produced in the production of ethyl maltol and put it into the reaction kettle, add clean water 2.3 times its mass, stir and beat, heat to 100°C and distill for 2 hours; press filter to obtain magnesium hydroxide filter cake and magnesium chloride mother liquor , add 4% by volume of 27.5% hydrogen peroxide to the magnesium oxide mother liquor, control the temperature at 85°C, stir for 10 minutes, digest the organic impurities in the mother liquor, separate by pressure filtration, and obtain the colorless magnesium chloride mother liquor; analyze the magnesium chloride in the colorless magnesium chloride mother liquor content, measure its volume and density, calculate its mass of magnesium chloride, add 75% of its mass of ammonium bicarbonate and 35% of 20% ammonia water, maintain the temperature at 65°C for 70 minutes under stirring, and generate basic magnesium carbonate Suspension: press filter to separate the suspension ...

Embodiment 2

[0029] Take the basic magnesium chloride waste slag produced in the production of maltol and put it into the reaction kettle, add clean water 2.6 times its mass, stir and beat, heat to 103°C and distill for 2.2 hours; press filter to obtain magnesium hydroxide filter cake and magnesium chloride mother liquor, and pour Add 27.5% hydrogen peroxide of 5% by volume to the magnesium oxide mother liquor, control the temperature at 90°C, stir for 12 minutes, digest the organic impurities in the mother liquor, separate by pressure filtration, and obtain the colorless magnesium chloride mother liquor; analyze the magnesium chloride content of the colorless magnesium chloride mother liquor, Measure its volume and density, calculate its mass of magnesium chloride, add 80% of its mass ammonium bicarbonate and 40% of 20% ammonia water, maintain the temperature at 70°C for 75 minutes while stirring, and generate basic magnesium carbonate suspension liquid; press filtration to separate the su...

Embodiment 3

[0031] Take the basic magnesium chloride waste residue produced in the production of spices and put it into the reaction kettle, add clean water 2.8 times its mass, stir and beat, heat to 105°C and distill for 2.5 hours; press filter to obtain magnesium hydroxide filter cake and magnesium chloride mother liquor, and pour into the magnesium oxide Add 6% by volume of 27.5% hydrogen peroxide to the mother liquor, control the temperature at 90°C, stir for 15 minutes, digest the organic impurities in the mother liquor, separate by pressure filtration, and obtain the colorless magnesium chloride mother liquor; analyze the magnesium chloride content of the colorless magnesium chloride mother liquor, and measure its Volume and density, calculate its magnesium chloride quality, add its mass 85% of ammonium bicarbonate and 35% of 20% ammonia water, keep the temperature at 70°C for 70 minutes while stirring, and generate basic magnesium carbonate suspension; The suspension was separated b...

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Abstract

The invention discloses a method for producing active magnesium oxide from spice waste residues, wherein the method comprises the steps: adding water into basic magnesium chloride waste residues generated from spices to distill out a solvent, carrying out filter pressing to obtain magnesium chloride mother liquor, adding hydrogen peroxide into the mother liquor to fade, adding ammonium bicarbonateand ammonia water to precipitate basic magnesium carbonate, washing, drying and calcining to obtain the active magnesium oxide, wherein the citric acid value is 8.0-18.0 s, and the magnesium oxide content is greater than or equal to 97.5%. According to the invention, the spice basic magnesium chloride waste residues are used as a raw material, and an ammonium bicarbonate carbonization method is used for producing active magnesium oxide, so that the problem of recycling magnesium resources is solved, the economy is created, the ecological environment problem that the waste residues pollute soil and surface water is avoided, and the effective utilization of resources and the ecological environment protection are promoted, and economic and ecological benefits are significant.

Description

Technical field: [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a method for preparing active magnesium oxide from basic magnesium chloride waste slag produced in the production of spices. Background technique [0002] Due to its fine particle size, large specific surface area, irregular surface structure and large differentiation, activated magnesium oxide has become an inorganic chemical material with special properties such as light, electricity, mechanics and chemistry that is different from bulk materials, and has a wide range of uses. Accelerator and activator for fluororubber, chloroprene rubber, butyl rubber, and nitrile rubber, filler for adhesives, plastics, paints, and paper, and can also be used to manufacture magnesium oxide cement and refractory materials, used in ceramics, glass, sports In sports, it is used medicinally as an antacid and laxative. Highly active magnesium oxide has high chemical activit...

Claims

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Application Information

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IPC IPC(8): C01F5/06C01F5/24
CPCC01F5/06C01F5/24C01P2006/80C01P2006/10
Inventor 耿庆保沈久东李仁昌石剑
Owner ANHUI JINGHE IND
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