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Method for preparing bleaching powder slurry from waste incineration fly ash

A waste incineration fly ash and bleaching powder technology, applied in the electrolysis process, electrolysis components, etc., can solve the problems of inability to put into the bleaching powder production process, low slaked lime content, etc., achieve simple preparation method, improve conversion rate, and promote the reaction of calcium-based substances Effect

Active Publication Date: 2022-03-22
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of slaked lime in waste incineration fly ash is small and contains a certain amount of salt, so it cannot be directly put into the existing bleaching powder production process

Method used

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  • Method for preparing bleaching powder slurry from waste incineration fly ash
  • Method for preparing bleaching powder slurry from waste incineration fly ash
  • Method for preparing bleaching powder slurry from waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Effect of mass ratio of carbonate, sodium chloride, and waste incineration fly ash on available chlorine content of prepared bleaching slurry

[0022] Preparation of bleaching slip: as in figure 1 As shown, according to the mass ratio 5:20:100, 5:25:100, 5:28:100, 2.5:30:100, 3.5:30:100, 4.5:30:100, 5:30:100, 15: 30:100, 25:30:100, 5:60:100, 15:60:100, 25:60:100, 5:90:100, 15:90:100, 25:90:100, 27.5:90: 100, 26.5:90:100, 25.5:90:100, 25:92:100, 25:95:100, 25:100:100 Weigh carbonate, sodium chloride, waste incineration fly ash respectively, mix and stir , to obtain carbon mixed with fly ash mixed salt, wherein the carbonate is sodium carbonate; according to the liquid-solid ratio 1mL:1g mixed water and carbon mixed with fly ash mixed salt, stirred for 20 minutes, to obtain fly ash precipitated slurry; import fly ash precipitated slurry In the sample area of ​​the electrolytic cell, turn on the power, and conduct electrolytic treatment for 2 hours. Mix the electrolyzed ...

Embodiment 2

[0029] Effect of liquid-solid ratio of water and carbon mixed with fly ash on the available chlorine content of the prepared bleaching slurry

[0030] Preparation of bleaching slurry: Weigh carbonate, sodium chloride, waste incineration fly ash according to the mass ratio of 25:90:100, mix and stir to obtain carbon mixed with fly ash mixed salt, wherein carbonate is sodium carbonate; Solid ratio 0.5mL:1g, 0.7mL:1g, 0.9mL:1g, 1mL:1g, 2.5mL:1g, 4mL:1g, 4.2mL:1g, 4.5mL:1g, 5mL:1g mixed with water and carbon-doped fly ash Mix the salt and stir for 40 minutes to obtain the fly ash sedimentation slurry; introduce the fly ash sedimentation slurry into the sample area of ​​the electrolytic cell, turn on the power, turn on the power supply, and electrolyze for 4 hours, and mix the electrolyzed electrolyzer anolyte with the electrolyzed sample The fly ash sedimentation slurry in the sample area is mixed and stirred evenly to obtain a bleached slurry. In the process of turning on the pow...

Embodiment 3

[0036] Influence of Power On Time on Available Chlorine Content of Prepared Bleaching Slurry

[0037] Preparation of bleaching slurry: Weigh carbonate, sodium chloride, waste incineration fly ash according to the mass ratio of 5:30:100, mix and stir to obtain carbon mixed with fly ash mixed salt, wherein carbonate is sodium carbonate; Solid ratio 4mL: 1g mixed with water and carbon mixed with fly ash mixed salt, stirred for 60 minutes to obtain fly ash sedimentation slurry; import the fly ash sedimentation slurry into the sample area of ​​the electrolytic cell, turn on the power, and electrolyze for 0.5 hours, 1 hour, 1.5 hours respectively hour, 2 hours, 4 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours, mix the anolyte of the electrolytic cell after electrolysis with the fly ash sedimentation slurry in the sample area after electrolysis, and stir evenly to obtain bleaching slurry. During the power-on process, the chlorine gas generated in the anode chamber of the electrolytic ...

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Abstract

The invention discloses a method for preparing bleaching powder slurry from waste incineration fly ash, which comprises the following steps: (1) uniformly mixing carbonate, sodium chloride and waste incineration fly ash to obtain carbon-doped fly ash mixed salt; (2) uniformly mixing the carbon-doped fly ash mixed salt with water to obtain fly ash precipitation slurry; (3) introducing the fly ash precipitation slurry into a sample area of an electrolytic bath, switching on a power supply, and electrolyzing the fly ash precipitation slurry; after the electrolysis is finished, uniformly mixing the electrolyzed anode liquid of the electrolytic cell with the electrolyzed fly ash precipitation slurry of the sample area to obtain bleaching powder slurry; wherein in the electrolysis process, chlorine gas generated in the anode chamber of the electrolytic cell is aerated into the fly ash precipitation slurry in the sample area, and carbon dioxide generated in the sample area is directly discharged out. According to the method, efficient resource utilization of the hazardous waste, namely the waste incineration fly ash, is achieved, the waste incineration fly ash is used for preparing the bleaching powder pulp, the preparation method is simple, the effective chlorine content of the prepared bleaching powder pulp can reach 36.14% at most, and practical application can be met.

Description

technical field [0001] The invention relates to resource recycling of solid waste, in particular to a method for preparing bleaching slurry by utilizing waste incineration fly ash. Background technique [0002] The siege of waste is imminent. Vigorously promoting incineration technology and significantly improving domestic waste disposal capacity have become the development basis for the comprehensive realization of harmless disposal of domestic waste. [0003] Bleaching powder has a wide range of industrial uses, and is used in bleaching, electroplating, and food production industries. Bleaching powder is usually made of saturated sodium chloride solution and slaked lime as raw materials, and chlorine gas is generated by electrolysis and then passed into dry slaked lime for reaction. Because absolutely dry calcium hydroxide does not react with chlorine, chlorine can only be adsorbed by calcium hydroxide. For this reason, in the industry, slaked lime containing less than 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/14C25B1/26
CPCC25B1/14C25B1/265
Inventor 黄涛宋东平周璐璐张树文徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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