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Method for extracting magnesium oxide from desulfurization wastewater produced from magnesium desulfurization

A desulfurization wastewater, magnesium desulfurization technology, applied in the direction of magnesium oxide, chemical instruments and methods, gaseous effluent wastewater treatment, etc., can solve the problems of reducing investment benefits, not using waste heat, etc., and achieve the effect of reducing operating costs and low costs

Inactive Publication Date: 2018-03-16
GUANGDONG HUAXIN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: if the calcined magnesium sulfite is less, the amount of sulfur dioxide produced after calcining is less, the investment benefit is correspondingly reduced, and the waste heat is not used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take 100mL of sintering desulfurization waste water in a round bottom flask, and heat it in a water bath at 45°C at a constant temperature, take 50mL of ammonia water in a constant pressure dropping funnel, slowly drop it into the round bottom flask for about 0.5h, and stir in time ;

[0025] (2) After the ammonia water is added dropwise, age for 1 hour, filter the formed magnesium hydroxide precipitate with a sandstone suction filter, and wash it with distilled water for 4 times to obtain solid magnesium hydroxide.

[0026] (3) The magnesium hydroxide solid was calcined in a muffle furnace at 700°C, evaporated to remove water, and the magnesium oxide solid was obtained, and the purity of the magnesium oxide was detected to be 86.75%, which met the requirements of a steel plant for recycling as a desulfurization absorbent, greatly The operation cost of magnesium desulfurization is reduced.

Embodiment 2

[0028] (1) Take 100mL of sintering desulfurization wastewater in a round bottom flask, and heat it in a water bath at 50°C at a constant temperature, take 75mL of ammonia water in a constant pressure dropping funnel, slowly drop it into the round bottom flask for about 0.5h, and stir in time ;

[0029] (2) After the ammonia water is added dropwise, age for 1 hour, filter the formed magnesium hydroxide precipitate with a sandstone suction filter, and wash it with distilled water for 5 times to obtain solid magnesium hydroxide.

[0030] (3) The magnesium hydroxide solid was calcined in a muffle furnace at 700°C, evaporated to remove water, and the magnesium oxide solid was obtained, and the purity of the magnesium oxide was detected to be 88.81%, which meets the requirements of a steel plant for recycling as a desulfurization absorbent, greatly The operation cost of magnesium desulfurization is reduced.

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Abstract

The invention relates to a method for extracting magnesium oxide from desulfurization wastewater produced from magnesium desulfurization. The method comprises the following process steps: (1) enablingsintering desulfurization wastewater produced by magnesium desulfurization to directly react with ammonium hydroxide in a device of 40-60 DEG C, producing a magnesium hydroxide precipitate, aging for0.5-1.5 hours, and filtering to obtain a magnesium hydroxide solid; (2) washing the magnesium hydroxide obtained in the step (1) with distilled water for 4-8 times, and drying to obtain a magnesium oxide solid; (3) calcining the magnesium hydroxide washed in the step (2) at the temperature of 700-900 DEG C to obtain magnesium oxide, returning the obtained magnesium oxide to a sintering desulfurization system to be used, so as to complete a cycle. Magnesium resources are recycled. Moreover, pollution to a water body caused by the desulfurization wastewater is avoided, the operating cost of enterprises is greatly reduced, and even a certain cycling economy efficiency is achieved.

Description

technical field [0001] The invention belongs to the technical field of waste recycling and relates to a method for extracting magnesium oxide from desulfurization wastewater produced by magnesium desulfurization. Background technique [0002] In recent years, the patented magnesium desulfurization technology has been applied in a very few countries or regions such as the United States, Japan, South Korea, and Taiwan. Compared with the limestone-gypsum method, the magnesium oxide method has many advantages: the desulfurization reaction activity of the magnesium-based desulfurizer is high, the dosage is only 40% of the limestone, the energy consumption of the circulating slurry pump is low, and the size of the tower body is reduced. Not only the desulfurization efficiency is high, It also reduces equipment investment and operating costs, and can avoid problems such as scaling and blockage in the desulfurization system. [0003] Since the by-products of magnesium desulfurizati...

Claims

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Application Information

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IPC IPC(8): C01F5/08C02F9/04C02F103/18
CPCC01F5/08C02F1/001C02F1/58C02F2103/18
Inventor 钟练文万博王小豆江承付张彬彬黄婷陈惠容蔡海燕刘显清朱忠文郑韶燕龙芳菊
Owner GUANGDONG HUAXIN ENVIRONMENTAL PROTECTION TECH CO LTD
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