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Phosphogypsum-based lightweight plastering gypsum product

A technology of plastering gypsum and phosphogypsum, which is applied in the field of building materials, can solve the problems of unsatisfactory overall strength, high local strength of products, and low proportion of phosphogypsum, and achieve the effect of solving the problem of resource utilization and firm bonding

Inactive Publication Date: 2018-11-13
宁波荣山新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are actually problems: ①The proportion of phosphogypsum is too low, because the mechanical properties of gypsum are far worse than cement, so this phosphogypsum is not enough to cover all the ultrafine sand particles, resulting in high local strength of the product and unsatisfactory overall strength; ② Poor encapsulation of phosphogypsum makes it difficult to level the operation surface during the construction process, and the construction workability is poor, especially compared with the construction workability of natural gypsum or desulfurized gypsum as the cementitious mortar system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 850 parts of phosphogypsum powder, 150 parts of 50-mesh vitrified microspheres, 8 parts of calcium hydroxide, 0.5 parts of retarder, 2 parts of water-retaining agent, and 4 parts of wood fiber. During preparation, the admixture and the powder are mixed with the large-grained solid material through the first-stage forced agitation and then the second-stage gravity-free agitation. When in use, water 0.7 times the weight of the solid material is added for stirring to obtain a phosphogypsum-based lightweight plastering gypsum product.

[0028] The performance test of this embodiment is carried out according to the standard "Plastering Gypsum" GB / T 28627-2012, and the obtained test results are: water retention rate 80%, thermal conductivity 0.095W / m K, initial setting time 70min, final setting time Time 2.5h, 7d flexural strength 1.28MPa, 7d compressive strength 3.80MPa, 7d tensile bond strength 0.41MPa.

Embodiment 2

[0030] 850 parts of phosphogypsum powder, 50 parts of 80-mesh vitrified microspheres, 100 parts of 80-mesh cinder, 10 parts of calcium hydroxide, 1 part of retarder, 3 parts of water-retaining agent, and 10 parts of polyvinyl alcohol. During preparation, the admixture and the powder are mixed with the large-grained solid material through the first-stage forced agitation and then the second-stage gravity-free agitation. When in use, add water 1 times the weight of the solid material for stirring to obtain a phosphogypsum-based lightweight plastering gypsum product.

[0031] The performance test of this embodiment is carried out according to the standard "Plastering Gypsum" GB / T 28627-2012, and the obtained test results are: water retention rate 94%, initial setting time 90min, final setting time 3h, 7d flexural strength 1.20MPa , 7d compressive strength 3.66MPa, 7d tensile bond strength 0.43MPa.

Embodiment 3

[0033] 800 parts of phosphogypsum powder, 150 parts of 50-mesh vitrified microspheres, 50 parts of 50-mesh cinder, 8 parts of quicklime, 0.8 parts of retarder, 3 parts of water-retaining agent, and 4 parts of wood fiber. During preparation, the admixture and the powder are mixed with the large-grained solid material through the first-stage forced agitation and then the second-stage gravity-free agitation. When in use, water 0.8 times the weight of the solid material is added for stirring to obtain a phosphogypsum-based lightweight plastering gypsum product.

[0034] The performance test of this embodiment is carried out according to the standard "Plastering Gypsum" GB / T 28627-2012, and the obtained test results are: water retention rate 86%, thermal conductivity 0.093W / m K, initial setting time 90min, final setting time Time 3.2h, 7d flexural strength 1.10MPa, 7d compressive strength 3.50MPa, 7d tensile bond strength 0.39MPa.

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Abstract

The invention relates to a phosphogypsum-based lightweight plastering gypsum product. The phosphogypsum-based lightweight plastering gypsum product is prepared from the following components: phosphogypsum powder, an alkaline agent, aggregate, a retarder, a thickner and a water-retaining agent. The phosphogypsum-based lightweight plastering gypsum product provided by the invention has the advantages of light weight and high strength, capability of being firmly bonded with a base layer, no cracking, no hollowing and no odor; the phosphogypsum-based lightweight plastering gypsum product is suitable for indoor plastering construction in winter, has moisture absorption and moisture exhaust functions, and is fireproof and incombustible and the like; the phosphogypsum-based lightweight plasteringgypsum product is an excellent material for indoor plastering and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a phosphogypsum-based lightweight plastering gypsum product. Background technique [0002] With the rapid development of my country's economy, the discharge of by-products such as phosphogypsum has increased sharply with the rapid development of high-concentration phosphorus compound fertilizer and phosphoric acid industry, resulting in a large accumulation of phosphogypsum in my country. However, the utilization rate of phosphogypsum is low, and a large amount of land has to be occupied to stack phosphogypsum. Phosphogypsum contains a large amount of harmful impurities and seriously pollutes the environment and groundwater. Therefore, it is urgent to find a way out for large-scale resource utilization of phosphogypsum. [0003] Phosphogypsum is a solid waste produced during the wet process of phosphoric acid production, and its main component is calcium sulfate dihydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/143C04B2111/00482C04B2201/50C04B14/24C04B22/064C04B24/121C04B24/383C04B18/26C04B18/103C04B24/2623
Inventor 王小山屠浩驰阮华
Owner 宁波荣山新型材料有限公司
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