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Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid

A semi-dry desulfurization and gypsum whisker technology, applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of difficult dehydration, small particle size of gypsum, etc., and achieve easy acquisition, simple operation and low investment. Effect

Inactive Publication Date: 2013-02-06
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method involves combining different types of solid material (desulfuration dust) together by adding water or another liquid that helps it separate from harmful substances like iron). These solids help create new forms called calcined gypsum particles when exposed to strong acids such as concentrated nitrogen oxides. By reducing these contaminants during production, this method allows recovery of valuable chemicals without requiring expensive treatments on their own.

Problems solved by technology

The present technology described relates to methods that use less expensive reagent compared to existing technologies like hydrocracking. However, current techniques require long periods of operation before achieving complete destruction of pollutants. Therefore, they cannot meet environmental regulations mandated by regulators throughout their entire lifecycle.

Method used

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  • Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid
  • Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid
  • Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] From semi-dry desulfurization ash component analysis is as follows (mass percentage):

[0057]

[0058] Using the above process to produce gypsum whiskers, wherein the CaCl in the reactor 2 At 5%, sulfuric acid concentration 1.2%, solid content 7%, temperature 98°C, reaction time 3h, the produced gypsum whiskers have a purity of 98.1%, an average length of 220 μm, and an aspect ratio of 85.

Embodiment 2

[0060] From semi-dry method desulfurization ash component analysis is as follows table (mass percentage):

[0061]

[0062] Using the above process to produce gypsum whiskers, wherein the CaCl in the reactor 2 At 7%, the concentration of sulfuric acid is 4%, the solid content is 5%, the temperature is 101°C, and the reaction time is 3.5h, the purity of the produced gypsum whiskers is 98.4%, the average length is 195μm, and the aspect ratio is 80.

Embodiment 3

[0064] From semi-dry desulfurization ash component analysis is as follows (mass percentage):

[0065]

[0066] Using the above process to produce gypsum whiskers, wherein the CaCl in the reactor 2 At 5%, sulfuric acid concentration 0.8%, solid content 10%, temperature 102°C, reaction time 5.5h, the produced gypsum whiskers have a purity of 98.0%, an average length of 180 μm, and an aspect ratio of 70.

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Abstract

The invention discloses a process and a device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid. The process includes firstly, mixing semi-dry desulfurized fly ash and water to obtain desulfurized fly ash size, and regulating pH value of the desulfurized fly ash size to 5-6 before oxidation by waste hydrochloric acid to obtain size containing calcium sulfate and calcium chloride; and secondly, performing hydrocyclone-separation to the size containing calcium sulfate and calcium chloride, performing size mixing to bottom-flow size subjected to hydrocyclone-separation to obtain reaction size, reacting the reaction size with waste sulfuric acid, and dewatering obtained product to obtain alpha-semihydrate gypsum whisker. The three industrial wastes of desulfurized fly ash, waste hydrochloric acid and waste sulfuric acid are organically used to prepare the alpha-semihydrate gypsum whisker while collecting HCl gas, and prepared gypsum whisker is high in purity and low in water content.

Description

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Claims

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Application Information

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Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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