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Comprehensive utilization method of spice production waste residues and synthetic ammonia purge gas

A technology for synthesizing ammonia gas and waste residue, which is applied to magnesium oxide and other directions, can solve the problems of active magnesium oxide energy consumption, high water consumption, low production activity of magnesium oxide, and high chloride content, and achieves significant economic and ecological benefits, reducing Carbonization time, the effect of creating economic benefits

Inactive Publication Date: 2021-03-09
ANHUI JINGHE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of high energy consumption and high water consumption in the production of active magnesia by the ore method, and also avoid the use of soluble magnesium salts such as brine, bischofolite, magnesium sulfate as raw materials and ammonia, caustic soda, milk of lime The problem of low activity, high bulk density, and high chloride content in the production of magnesium oxide by reaction provides a method for comprehensive utilization of spice production waste residue and synthetic ammonia release gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put the basic magnesium chloride waste residue produced in the production of spices (ethyl maltol) into the reaction kettle, add deionized water 2.5 times its mass, stir and beat, stir and heat to 98 ° C for 2 hours, add 27.5% of 3.5% by volume About hydrogen peroxide, continue to stir for 12 minutes, press filter to obtain magnesium hydroxide filter cake.

[0031] Put the filter cake into the reaction kettle again, add deionized water, stir and beat, adjust the concentration of magnesium hydroxide to about 1.2%, control the temperature at about 20°C, and pass in 0.2MPa purified purge gas for pressure carbonization , carbonized for 7 hours to obtain heavy magnesium water, pour saturated steam into the heavy magnesium water for pyrolysis, when the temperature reaches about 65°C, turn on the negative pressure system to -0.065MPa, pyrolyze for 7 hours, stop the steam, and continue to cool down to 20°C, separated by pressure filtration to obtain basic magnesium carbonate fi...

Embodiment 2

[0033]Put the basic magnesium chloride waste residue produced in the production of spices (maltol) into the reaction kettle, add deionized water 2.8 times its mass, stir and beat, stir and heat to 102°C for distillation for 2.2 hours, add about 27.5% of 4% volume ratio hydrogen peroxide, continue to stir for 15 minutes, press filter to obtain magnesium hydroxide filter cake and magnesium chloride mother liquor, put the filter cake into the reaction kettle again, add deionized water, stir and beat, adjust the concentration of magnesium hydroxide to about 1.5%, and the temperature Control it at about 25°C, pass through 0.2MPa purified purge gas for pressure carbonization, carbonize for 7.5 hours, obtain heavy magnesium water, pass saturated steam into the heavy magnesium water for pyrolysis, when the temperature reaches about 75°C, open Negative pressure system to -0.075MPa, pyrolysis for 7.4 hours, stop the steam, continue to lower the temperature to 25°C under the auxiliary pre...

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Abstract

The invention relates to a comprehensive utilization method of spice production waste residues and synthetic ammonia purge gas, which comprises the following steps: 1, adding water into basic magnesium chloride waste residues generated in spice production, heating, and hydrolyzing basic magnesium chloride to obtain turbid liquid of magnesium chloride and magnesium hydroxide, 2, adding hydrogen peroxide to oxidize and decolorize, and carrying out filter pressing separation to obtain a magnesium hydroxide filter cake, 3, adding water into the magnesium hydroxide filter cake, and pulping to obtain a magnesium hydroxide turbid solution, 4, introducing synthetic ammonia purge gas into the turbid liquid for carbonization reaction to obtain magnesium bicarbonate water containing magnesium bicarbonate, and 5, heating and pyrolyzing the heavy magnesium water to obtain basic magnesium carbonate turbid liquid, performing filter pressing to obtain a filter cake, and washing, drying and calcining the filter cake to obtain high-activity magnesium oxide. The method has the advantages that the problem of recycling of magnesium resources is solved, and the pollution of waste residues to soil and surface water and the influence of direct emission of carbon dioxide gas into the atmosphere on the ecological environment are avoided. By adopting the pressurized carbonization method, the carbonization time is shortened, the utilization rate of carbon dioxide is increased, the energy consumption is reduced, the equipment investment is reduced, and the economic and ecological benefits are remarkable.

Description

Technical field: [0001] The invention relates to a method for preparing high-activity magnesium oxide by using basic magnesium chloride waste slag produced in spice production and synthetic ammonia release gas as raw materials to realize the reuse of magnesium resources and carbon dioxide, and belongs to the technical field of inorganic materials. Background technique [0002] Due to its fine particle size, large specific surface area, irregular surface structure and large differentiation, high-activity 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 used in fluorine rubber, neoprene rubber, butyl rubber, nitrile rubber, fillers for adhesives, plastics, paints, paper, and can also be used to manufacture magnesium oxide cement and refractory materials, used in ceramics, glass, In terms of sports, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06
CPCC01F5/06C01P2006/11C01P2006/80
Inventor 耿庆保沈久东李仁昌石剑
Owner ANHUI JINGHE IND
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