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Surface layer whitewash gypsum using dry-process desulfurized ash as raw material and preparation method thereof

A technology of dry desulfurization ash and plaster plaster, which is applied in the field of building materials, can solve problems such as environmental pollution and land occupation, and achieve the effects of high strength, good water retention performance, and excellent construction performance

Inactive Publication Date: 2012-06-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, some building material enterprises adopt dry-semi-dry method for flue gas desulfurization, which produces a large amount of desulfurization ash, which not only occupies a large amount of land, but also causes pollution to the environment. Therefore, the research on the comprehensive utilization of desulfurization ash has become an urgent need to solve It is also a technical bottleneck restricting the application of flue gas desulfurization technology in coal-fired power plants

Method used

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  • Surface layer whitewash gypsum using dry-process desulfurized ash as raw material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] By weight, weigh 60 parts of calcined desulfurized gypsum powder, the specific surface area is 330m 2 / kg, 10 parts of dry desulfurization ash, density 2.56g / cm3, gypsum retarder animal protein sodium salt (commercially available Suzhou Xingbang retarder SG) 0.5 part, water retaining agent hydroxypropyl methyl cellulose ether (HPMC) 0.2 parts, viscosity is 60,000 mpa.s, binder ("Wacker" 5044) 0.2 parts of vinyl acetate-ethylene copolymer latex powder, 30 parts of Shuangfei powder with a fineness of 350 mesh, put them into the mixer, and mix for 10 minutes to prepare the surface layer plaster dry powder.

Embodiment 2

[0021] By weight, weigh 55 parts of calcined desulfurized gypsum powder, the specific surface area is 380m 2 / kg, 25 parts of dry desulfurization ash, density of 2.42g / cm3, 0.6 part of gypsum retarder sodium citrate, 0.1 part of water retaining agent methyl cellulose ether (MC), viscosity of 60,000 mpa.s, bonding agent ("Yi Lai Tai" FL4200) 0.2 parts of vinyl acetate-tertiary carbon vinyl ester-acrylate copolymer latex powder, 20 parts of Shuangfei powder with a fineness of 400 mesh, put them into the mixer, and mix for 10 minutes to prepare the surface layer plaster dry powder.

Embodiment 3

[0023] By weight, weigh 40 parts of calcined desulfurized gypsum powder, the specific surface area is 420m 2 / kg, 40 parts of dry desulfurization ash, density of 2.48g / cm3, 0.7 part of gypsum retarder sodium polyphosphate, 0.2 part of water retaining agent hydroxyethyl methyl cellulose ether (HEMC), viscosity of 80,000 mpa. s, binder (Shanxi Sanwei SWF-05) 0.1 part of polyvinyl acetate-vinyl carboxylate-ethylene copolymer latex powder, 20 parts of Shuangfei powder, the fineness is 300 mesh, put into the mixer, mix for 10 minutes, and prepare noodles Layer plaster dry powder.

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Abstract

The invention relates to a surface layer whitewash gypsum using dry-process desulfurized ash as a raw material and a preparation method thereof. The surface layer whitewash gypsum using dry-process desulfurized ash is prepared from the following components in parts by weight: 40-60 parts of calcined desulfurized gypsum powder, 10-40 parts of dry-process desulfurized ash, 0.5-1 part of gypsum retarder, 0-0.2 part of adhesive, 0-0.2 part of water retention agent and 20-40 parts of filler. The invention develops a surface layer whitewash gypsum with high strength, strong binding power, favorablewater retention property and excellent workability, opens up a new way for producing excellent-property surface layer whitewash gypsum by using waste dry-process desulfurized ash, and fully utilizes desulfurized gypsum, dry-process desulfurized ash and other industrial residues to prepare the novel green energy-saving walling plastering material. The invention not only can reduce the environmental pollution, but also can recycle the waste, thereby reducing the abundant land resources occupied by waste placement and having wide development prospects.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a surface layer plastering gypsum using dry-process desulfurized ash as a raw material and a preparation method thereof. Background technique [0002] Stucco gypsum is dehydrated calcium sulfate dihydrate or calcined or excited anhydrous calcium sulfate, and its product is calcium sulfate hemihydrate (CaSO 4 1 / 2H 2 O) and type II anhydrous calcium sulfate (type II CaSO 4 ) alone or mixed with admixtures, or plastering materials made by adding fillers. Finishing gypsum is the last layer of gypsum plastering material used on base plaster or other substrates. It usually does not contain aggregates and has high strength. The usual plastering plaster is made of building gypsum, and replacing building gypsum with desulfurized ash-desulfurized gypsum mixture can reduce the utilization of gypsum resources. At the same time, rational use of solid waste such as desulfurized g...

Claims

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Application Information

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IPC IPC(8): C04B28/14
Inventor 李东旭张毅黄斌
Owner NANJING UNIV OF TECH
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