Technology for preparing composite desulphurization gypsum building block with gradient structure

A technology of desulfurized gypsum and composite blocks, which is applied in the field of building materials, can solve problems such as groundwater pollution, land occupation, and threats to health, and achieve the effects of improving thermal insulation performance, high utilization rate, and convenient construction and installation

Inactive Publication Date: 2015-03-11
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a large amount of desulfurized gypsum stockpiling not only occupies a large amount of land, but also brings new problems to the entire environment, such as soil acidification, groundwater pollution, dust, etc., thus threatening people's health

Method used

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  • Technology for preparing composite desulphurization gypsum building block with gradient structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Heat the pre-prepared cast iron mold that can be evenly divided into 4 grids by the pull-out partition to 35°C. The schematic diagram of the mold is as follows figure 1 shown.

[0022] Prepare 1-4 groups of gypsum composite cementitious material slurry. The same composition of these four groups of slurry is as follows: 60% of desulfurized building gypsum, 12% of ordinary Portland cement, 2% of high alumina cement, 10% of lime and 16% of fly ash are made into powder by mass, FJ- PCEⅡ type polycarboxylate high-efficiency superplasticizer is added in an amount of 1.0% of the powder mass, and citric acid is added in an amount of 0.02% of the powder mass; the water-material ratio is 0.5, and the water temperature is 35°C; from group 1 to group 1 Group 4, the dosage of aluminum powder was 0%, 0.1%, 0.2% and 0.3% respectively.

[0023] The well-stirred slurry of each group is poured into the 4 compartments of the mold to fill them up, and then the separator is pulled out and...

Embodiment 2

[0025] Heat the pre-prepared cast iron mold that can be evenly divided into 5 grids by extractable partitions to 45°C.

[0026] Five groups of gypsum composite cementitious material slurries were prepared. The same composition of these five groups of slurry is as follows: 70% of desulfurized building gypsum, 8% of ordinary Portland cement, 2% of high alumina cement, 10% of lime, and 10% of fly ash are made into powder by mass; FJ-PCEⅡ Type polycarboxylate high-efficiency water reducer is added at 1.0% of the powder mass, and citric acid is added at 0.02% of the powder mass; the ratio of water to material is 0.5, and the water temperature is 45°C; from group 1 to group 5 Group, the amount of aluminum powder were 0.05%, 0.1%, 0.15%, 0.2% and 0.25%.

[0027] The well-stirred slurry of each group was poured into the 5 compartments of the mold to fill them up, and then the separator was pulled out and smoothed; after that, it was placed at a constant temperature of 35°C and kept f...

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Abstract

The invention discloses a technology for preparing a composite desulphurization gypsum building block with a gradient structure. The composite desulphurization gypsum building block is prepared by the following steps of preparing slurry from a composite gypsum cementing material slurry formula disclosed by the invention, wherein N groups of slurry are prepared after aluminum powder is doped from a first group to an Nth group according to a gradient; sequentially pouring the slurry into a pre-fabricated cast iron die which is uniformly divided into N grids by withdrawable partition plates and is heated to 35 to 50 DEG C, withdrawing the partition plates and screeding the slurry, wherein the whole slurry pouring process is implemented within 5 to 15 minutes; maintaining the slurry together with the die for 2 to 4 hours under the condition of 35 to 50 DEG C; de-molding a maintained building block, and cutting the building block.

Description

technical field [0001] The invention relates to a preparation technology of a desulfurized gypsum composite block with a gradient structure, belonging to the field of building materials. Background technique [0002] According to current statistics, my country's flue gas desulfurization gypsum emissions have reached more than 40 million tons in 2010, but only about 30% of them have been comprehensively utilized, and the rest will continue to be stockpiled. Such a large amount of desulfurized gypsum stockpiles not only occupies a large amount of land, but also brings new problems to the entire environment, such as soil acidification, groundwater pollution, and dust, which threaten people's health. Therefore, it is of great significance to the whole society to deal with these wastes that pollute the environment, and to use desulfurized gypsum in an environmentally friendly, and even resourceful, way. Contents of the invention [0003] In order to use desulfurized gypsum in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
Inventor 张磊杨久俊王雪平杨沛森劳有盛陈晓良
Owner TIANJIN CHENGJIAN UNIV
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