Method for recycling washing water and coproducing magnesium ammonium fertilizer during carbonization-process magnesium oxide production

A by-product magnesium ammonium fertilizer and production process technology, applied in the field of wastewater recycling and by-product ammonium sulfate magnesium fertilizer, can solve the problems of ammonia nitrogen wastewater pollution, activated sludge failure of sewage treatment system, water swelling, etc., and achieve low water content , easy to filter and save water resources

Active Publication Date: 2017-01-04
河北镁神科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the washing water is directly discharged outside, it will cause ammonia nitrogen wastewater pollution; if it is recycled as process water, it will cause "water swelling" in the production process; if the washing water is directly discharged into the sewage treatment system, the salt contained in the washing water will cause the sewage treatment system. Due to the failure of activated sludge, the treatment of washing water in the production process has always been a difficult problem for pharmaceutical grade magnesia manufacturers. The comprehensive utilization of washing water is carried out to realize zero discharge of wastewater in the production process, and the ammonium, magnesium, and It is imperative to turn waste into treasure such as sulfate radicals

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  • Method for recycling washing water and coproducing magnesium ammonium fertilizer during carbonization-process magnesium oxide production

Examples

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Effect test

Embodiment 1

[0037] Example 1

[0038] Set ammonium ion to 3.20g / L, magnesium ion to 0.61g / L and sulfate to 11.0g / L, and the flow rate is 50m 3 / h of washing water (1) is pressurized to 0.6MPa, and enters the liquid-solid hydrocyclone group at a flow rate of 35m / s, and the liquid-solid hydrocyclone group removes the solid substances with larger particle size in the washing water. The particles are separated. The washing water from the liquid-solid hydrocyclone group first enters the volume of 2.0m 3 The activated carbon adsorption tank further separates the impurities, and then pressurizes to 0.68MPa and enters the filter area of ​​40m 2 The plate and frame filter further filters out the fine solid particles to obtain a fine filtrate.

[0039] The fine filtrate is pressurized and then pumped to a processing capacity of 60m 3 / h salt water volume of the primary membrane concentration reverse osmosis membrane water purification device, 29.9m 3 / h Primary membrane separation of purified water and ...

Embodiment 2

[0044] Set ammonium ion to 2.80g / L, magnesium ion to 0.58g / L, and sulfate to 9.8g / L, and the flow rate is 60m 3 The washing water per hour is pressurized to 0.5 MPa and enters the liquid-solid hydrocyclone group at a flow rate of 28 m / s, and the liquid-solid hydrocyclone group separates the solid material particles with larger particle size contained in the washing water. The washing water from the liquid-solid hydrocyclone group first enters the volume of 2.0m 3 The activated carbon adsorption tank further separates the impurities, and then pressurizes to 0.55MPa to enter the filter area of ​​40m 2 The plate and frame filter further filters out the fine solid particles to obtain a fine filtrate.

[0045] Press the said fine filtrate and drive it to a processing capacity of 80m 3 / h salt water volume of the primary membrane concentration reverse osmosis membrane water purification device, 36.3m 3 / h Primary membrane separation of purified water and 23.7m 3 / h Medium-strength brine ...

Embodiment 3

[0050] The washing water contains ammonium ions at 3.80g / L, magnesium ions at 0.77g / L, and sulfate ions at 13.2g / L, and the flow rate is 45m 3 / h of washing water is pressurized to 0.6MPa and enters the liquid-solid hydrocyclone group at a flow rate of 23m / s. The liquid-solid hydrocyclone group removes the solids with larger particle size in the washing water. The material particles are separated. The washing water from the liquid-solid hydrocyclone group first enters the volume of 2.0m 3 The activated carbon adsorption tank further separates the impurities, and then pressurizes to 0.65MPa to enter the filter area of ​​40m 2 The plate and frame filter further filters out the fine solid particles to obtain a fine filtrate.

[0051] After pressurizing the described fine filtrate, it is injected to a processing capacity of 60m 3 / h salt water volume of the primary membrane concentration reverse osmosis membrane water purification device, 26.9m 3 / h Primary membrane separation of puri...

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Abstract

The invention relates to a method for recycling washing water and coproducing a magnesium ammonium fertilizer during carbonization-process magnesium oxide production. The method comprises the following steps: hydrocyclone separation, activated carbon adsorption, plate and frame filter and other liquid-solid separation processes are utilized to remove solid matters in the washing water; two-stage reverse osmosis membrane filtration is utilized to concentrate the washing water; a mechanical compression heat pump evaporation technique is adopted to perform further evaporative concentration; purified water with very low total salt content obtained in the concentration process is recycled to the production system as process water; and the concentrated solution generates a large-granule ammonium sulfate magnesium fertilizer in a crystallization aging device, and the large-granule ammonium sulfate magnesium fertilizer is subjected to centrifugal separation, packaging and the like to obtain the ammonium sulfate magnesium fertilizer byproduct. In the washing water recycling process, the ammonium magnesium fertilizer byproduct is obtained, thereby being beneficial to implementing wastewater zero discharge in the medical magnesium oxide production process, and achieving the goal of changing wastes into valuable substances.

Description

Technical field [0001] The present invention belongs to the technical field of chemical industry, and relates to a method for recycling washing water and by-product magnesium ammonium fertilizer in the production process of magnesium oxide by carbonization method, in particular to a method for recycling waste water and by-product in the process of producing pharmaceutical grade magnesium oxide by carbonization method The method of ammonium magnesium sulfate fertilizer. Background technique [0002] In the process of producing pharmaceutical grade magnesium oxide by carbonization with light-burned magnesium oxide as raw material, sulfuric acid as a raw material, and carbonization with ammonium bicarbonate as a carbonizing agent, in order to obtain high-purity magnesium oxide, it is necessary to adjust the intermediate product basic magnesium carbonate The crystalline particles are fully filtered and washed, which will inevitably produce a large amount of washing water. The washin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C05C3/00C02F103/34
Inventor 孙孟勇李连会王振道王立云胡硕真赵风云
Owner 河北镁神科技股份有限公司
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