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A method for recycling washing water and by-product magnesium ammonium fertilizer in the production process of carbonization magnesia

A technology of by-product magnesium ammonium fertilizer and production process, which is applied in the field of waste water recycling and by-product ammonium sulfate fertilizer, can solve the problems of activated sludge failure in sewage treatment system, ammonia nitrogen wastewater pollution, water swelling, etc., and achieve easy filtration, Low water content, the effect of saving water resources

Active Publication Date: 2019-09-17
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

Method used

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  • A method for recycling washing water and by-product magnesium ammonium fertilizer in the production process of carbonization magnesia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1

[0038] The ammonium ion is 3.20g / L, the magnesium ion is 0.61g / L and the sulfate radical is 11.0g / L, and the flow rate is 50m3 The washing water (1) of / h is pressurized to 0.6MPa, enters the liquid-solid cyclone separator group with the flow velocity of 35m / s, and the liquid-solid cyclone separator group removes the larger solid matter contained in the washing water Particles are separated. The washing water from the liquid-solid cyclone separator group first enters the volume of 2.0m 3 The activated carbon adsorption tank further separates the impurities in it, and then pressurizes to 0.68MPa and then enters the filter area with a filter area of ​​40m 2 The plate and frame filter further filters out the fine solid particles to obtain the fine filtrate.

[0039] The fine filtrate is pumped into after pressurized to a processing capacity of 60m 3 / h salt water volume of primary membrane concentration reverse osmosis membrane water purification device, get...

Embodiment 2

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

[0045] After the fine filtrate is pressurized, it is pumped to a processing capacity of 80m 3 / h salt water volume of primary membrane concentration reverse osmosis membrane water purification device, get 36.3m 3 / h primary membrane separation of clean wa...

Embodiment 3

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

[0051] Pressurize the fine filtrate into a 60m 3 / h salt water volume of primary membrane concentration reverse osmosis membrane water purification device, get 26.9m 3 / h primary membrane separation of clean water an...

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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 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 carbonization magnesia, in particular to a method for recycling waste water and by-products in the process of producing pharmaceutical grade magnesia by carbonization The method of ammonium magnesium sulfate fertilizer. Background technique [0002] In the process of producing pharmaceutical grade magnesia by using light-burned magnesia as raw material, dissolving with sulfuric acid, and carbonizing ammonium bicarbonate as a carbonizing agent, in order to obtain high-purity magnesia, it is necessary to process the intermediate product basic magnesium carbonate The crystalline particles are fully filtered and washed, which inevitably produces a large amount of washing water. The washing water contains 1.0-4.0 g / L of ammonium ions, 0.4-0.8 g / L of magnesium ions an...

Claims

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Application Information

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Patent Type & Authority Patents(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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