Method for preparing gypsum powder by microwave activation

A technology of microwave activation and gypsum powder, which is applied in the field of preparation of industrial gypsum powder, can solve the problems affecting the appearance of downstream products, the color of desulfurized gypsum is black, etc., and achieve the effects of saving a lot of mining, low production cost and simple process

Inactive Publication Date: 2010-02-10
湖南安雅达建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the color of desulfurized gypsum is black, which affects the appearance of downstream products. It must be reprocessed for secondary use.

Method used

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  • Method for preparing gypsum powder by microwave activation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: The desulfurized gypsum with dihydrate gypsum as the main component obtained from the desulfurization treatment of a coal-fired power plant, by weight percentage desulfurized gypsum 70%: modifier 15%: bleaching agent 15% at about 150 ℃ unsaturated gypsum Mix in the steam medium, and then send the mixed material into the glass fiber reinforced plastic cylinder 2b of the microwave equipment. With the rotation of the outer stainless steel rotating body 2a of the drum, the inner glass fiber reinforced plastic cylinder 2b is driven to rotate, so that the mixed material is microwave dried and dehydrated At the same time, it is turned together with the ball mill body 4 in the working chamber of the microwave equipment to grind each other, and the mixture is ground to obtain gypsum powder while drying and dehydrating. Finally, send the gypsum powder to the microwave equipment for natural cooling and aging. The modifier is prepared by compounding isobutyric acid an...

Embodiment 2

[0016] Embodiment 2: 90% of desulfurized gypsum by weight percentage: modifier 5%: bleaching agent 5% is mixed in an unsaturated steam medium not higher than 180°C, and then the mixture is sent into the glass fiber reinforced plastic cylinder 2b, and then The glass fiber reinforced plastic cylinder 2b is rotated so that the mixed material is ground while being dried and dehydrated to obtain gypsum powder. Finally, send the gypsum powder out of the microwave equipment for cooling. The modifier is prepared by compounding lauric acid and calcium sulfate according to the medium concentration of 1:1. Bleach is prepared by compounding hydrogen peroxide and sodium hypochlorite at a ratio of 80:1. The filling factor of the mixture into the microwave equipment is 0.7, the drying and dehydration temperature is 150°C, and the power density of the microwave feeding is controlled at 4.5kW / m 3 , residence time 180min. The fineness of the prepared gypsum powder requires a 180-mesh sieve w...

Embodiment 3

[0017] Embodiment 3: 80% of desulfurized gypsum by weight percentage: modifier 10%: bleaching agent 10% is mixed in an unsaturated steam medium not lower than 120°C, and then the mixture is sent into the glass fiber reinforced plastic cylinder 2b, and then The glass fiber reinforced plastic cylinder 2b is rotated so that the mixed material is ground while being dried and dehydrated to obtain gypsum powder. Finally, send the gypsum powder out of the microwave equipment for cooling. The modifying agent was prepared by compounding hexivalic acid and potassium sulfate according to the medium concentration of 1:1. Bleach is prepared by compounding hydrogen peroxide and sodium hypochlorite at a ratio of 50:1. The filling coefficient of the mixture into the microwave equipment is 0.65, the drying and dehydration temperature is 130°C, and the power density of the microwave feeding is controlled at 4.0kW / m 3 , The residence time is about 150min. The fineness of the prepared gypsum p...

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Abstract

The invention provides a method for preparing gypsum powder by microwave activation, comprising: according to the weight percent, firstly mixing 70-90% of desulfurization gypsum, 5-20% of modifying agent and 5-20% of bleaching agent in non-saturated vapor medium at the temperature of 120-180 DEG C, and then sending into microwave equipment for microwave drying and dewatering; meanwhile, arranginga ball-milling body inside a work cavity of the microwave equipment, and carrying out powder grinding on the mixed material when in drying and dewatering to prepare gypsum powder material; finally, sending the gypsum powder material out of the microwave equipment to be cooled. The method can be used for treating desulfurization gypsum which is industrial waste for a second time for recycling, andsecondary pollution can not be caused.

Description

technical field [0001] The invention relates to a method for preparing industrial gypsum powder. Background technique [0002] Desulfurization gypsum, a by-product of flue gas desulfurization, is a waste of industrial production. The annual discharge in my country is as high as 26 million tons, which seriously pollutes the atmospheric environment, destroys ecological balance, and damages human health. Desulfurized gypsum is a secondary resource that can be used, but the existing secondary treatment process and equipment for desulfurized gypsum basically use coal or oil as fuel, causing secondary pollution. [0003] The chemical composition and mineral composition of flue gas desulfurization gypsum and natural dihydrate gypsum are basically similar, and the main minerals are calcium sulfate dihydrate (CaSO4 2H 2 O). The calcium sulfate dihydrate content of desulfurized gypsum can reach more than 90%, and the grade is high, while the calcium sulfate dihydrate content of natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B11/036
Inventor 李国明韦华童军廖学飞陈碧林
Owner 湖南安雅达建材科技有限公司
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