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Method for preparing gypsum by using semi-dry method to sinter flue gas desulfurization byproduct

A technology for desulfurization by-products and sintering flue gas, applied in separation methods, chemical instruments and methods, calcium/strontium/barium sulfate, etc., can solve problems such as no treatment plan, complex components and high content of sintering flue gas desulfurization by-products , to achieve the effect of reducing processing costs and solving processing and utilization problems

Active Publication Date: 2012-12-05
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, domestic major steel mills are all launching sintering flue gas desulfurization projects in response to the requirements of the national environmental protection policy. Many manufacturers are interested in it, but the composition of by-products of semi-dry sintering flue gas desulfurization is complex, mainly containing CaSO 3 , CaSO 4 , unreacted Ca(OH) 2 and CaO and other impurities
Due to its complex composition and extremely fine particle size, it is easy to generate dust when stacked in the open air; the alkalinity is very strong, and the pH value of the solution reaches 12.81. If it needs to be disposed of in accordance with the standard of hazardous solid waste, the landfill cost is high; as a low Grade gypsum is used in construction materials due to CaSO 3 High content, prone to expansion and bursting
Therefore, how to dispose of the by-products of semi-dry sintering flue gas has become a major problem at home and abroad, and there is no better treatment plan at present

Method used

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  • Method for preparing gypsum by using semi-dry method to sinter flue gas desulfurization byproduct

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Experimental program
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Effect test

Embodiment 1

[0024] The device for preparing gypsum by semi-dry sintering flue gas desulfurization by-products is located near the waste sulfuric acid site. For the convenience of transportation, the powdered sintering flue gas desulfurization by-products are granulated into balls. Such as figure 1 , 2 As shown, the desulfurization by-product and quicklime are mixed according to the ratio of 4:1, configured into a 10% emulsion in the milk making device, and then the emulsion is input into the reaction tank to react with the waste sulfuric acid solution, and mixed in the reaction tank When the pH of the solution reaches 6.5, the mixed solution is pumped into the concentration tank to concentrate, and the waste water is discharged after concentration, and the concentrate is pumped into the dehydration device for dehydration, and after dehydration, it is dried to obtain gypsum.

Embodiment 2

[0026] The device for preparing gypsum by semi-dry sintering flue gas desulfurization by-products is located near the waste sulfuric acid site. For the convenience of transportation, the powdered sintering flue gas desulfurization by-products are granulated into balls. Such as figure 1 , 2 As shown, the desulfurization by-product and quicklime are mixed according to the ratio of 4:1, and configured into a 10.5% emulsion in the lime slurry milking device, and then the emulsion is input into the reaction tank to react with the waste sulfuric acid solution, and the reaction is carried out simultaneously Manual or mechanical stirring, until the pH of the mixed solution in the reaction tank reaches 7.0, pump the mixed solution into the concentration tank to concentrate, after concentration, the waste water is discharged, the concentrate is pumped into the centrifugal dehydrator for dehydration, and after dehydration, it is air-dried to obtain gypsum.

Embodiment 3

[0028] The device for preparing gypsum by semi-dry sintering flue gas desulfurization by-products is located near the waste sulfuric acid site. To prevent pollution, cement bulk trucks are used to transport powdered sintering flue gas desulfurization by-products. Such as figure 1 , 2 As shown, the desulfurization by-product and quicklime are mixed according to the ratio of 4:1, configured into an 11% emulsion in the lime slurry milking device, and then the emulsion is input into the reaction tank to react with the waste sulfuric acid solution, and the reaction is simultaneously used The blower is used for aeration and stirring. When the pH of the mixed solution in the reaction tank reaches 7.5, the mixed solution is pumped into the concentration tank for concentration. After concentration, the waste water is discharged. The concentrate is pumped into the centrifugal dehydrator for dehydration, and after dehydration, it is air-dried to obtain gypsum.

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Abstract

The invention discloses a device for preparing gypsum by using a semi-dry method to sinter a flue gas desulfurization byproduct, which is formed by successively arranging a cream preparation device, a reaction tank, a concentrated tank and a dehydration device. The method for preparing gypsum by the semi-dry method to sinter a flue gas desulfurization byproduct comprises the following steps: mixing the desulfurization byproduct with quick lime in the ratio of 4:1; preparing 10-12% emulsion in the cream preparation device; then, inputting the emulsion to the reaction tank so as to react with awaste sulfuric acid solution; when the pH value of the mixed liquor in the reaction tank reaches 6.5-7.5, pumping the mixed liquor into the concentrated tank to concentrate; discharging wastewater after the mixed liquor is concentrated; pumping the concentrate into the dehydration device to dehydrate; and drying after dehydrating to obtain the gypsum. The device and method can be used to not onlyprocess the flue gas desulfurization byproduct sintered by the semi-dry method, but also process the waste sulfuric acid, and the gypsum prepared by the reaction of the desulfurization byproduct and the waste sulfuric acid can serve as a novel building material.

Description

technical field [0001] The invention belongs to the field of environmental protection and resource comprehensive utilization, and in particular relates to a treatment method and device for by-products of semi-dry sintering flue gas desulfurization. Background technique [0002] At present, domestic major steel mills are all launching sintering flue gas desulfurization projects in response to the requirements of the national environmental protection policy. Many manufacturers are interested in it, but the composition of by-products of semi-dry sintering flue gas desulfurization is complex, mainly containing CaSO 3 , CaSO 4 , unreacted Ca(OH) 2 And CaO and other impurities. Due to its complex composition and extremely fine particle size, it is easy to generate dust when stacked in the open air; the alkalinity is very strong, and the pH value of the solution reaches 12.81. If it needs to be disposed of in accordance with the standard of hazardous solid waste, the landfill co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80C01F11/46B01D53/50
Inventor 饶磊陈广言周晨辉刁军吴朝刚汪保平叶平丁陈来张耀辉马孟臣戴玉芬
Owner MAANSHAN IRON & STEEL CO LTD
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