Bottom layer plastering gypsum and preparation method thereof

A plastering gypsum and bottom layer technology, applied in the field of bottom plastering gypsum and its preparation, can solve the problems such as the inconspicuous retarding effect, achieve the effect of reducing the consumption of natural resources, alleviating the extreme shortage, and improving the level of resource utilization

Inactive Publication Date: 2021-06-04
宝武集团环境资源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simultaneous desulfurization of Al in ash 2 o 3 , SiO 2 The components can improve the water resistance of gypsum-based materials, and can expand the application range of plastering gypsum; however, the following issues still need to be considered in the preparation of bottom plastering gypsum by semi-dry desulfurization ash: 1. Preparation of bottom plaster with semi-dry desulfurization ash The raw materials and raw material ratio used in plastering gypsum; 2. Semi-dry desulfurization ash has strong alkalinity, while the

Method used

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  • Bottom layer plastering gypsum and preparation method thereof
  • Bottom layer plastering gypsum and preparation method thereof
  • Bottom layer plastering gypsum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The bottom plastering gypsum of the present embodiment is prepared by the following method:

[0071] (1) Batching: take raw material and admixture according to the component of plastering gypsum at the bottom, wherein the components of raw material and admixture all weigh by weight in 1kg of plastering gypsum at the bottom:

[0072]

[0073] Wherein the above raw materials do not use semi-dry desulfurization ash, then the protein retarder can be used alone in the corresponding composite retarder; the composite retarder can also use protein retarder and carboxylic acid (salt) group containing The organic retarder is chemically prepared.

[0074] (2) Admixture configuration: Add the composite retarder, water retaining agent, and starch ether weighed in step (1) into the mixer for pre-mixing for 2 to 3 minutes, so that each component is mixed evenly to obtain the admixture;

[0075] (3) Bottom plastering gypsum configuration: according to the order of feeding, add the ...

Embodiment 2

[0079] The bottom plastering gypsum of the present embodiment is prepared by the following method:

[0080] (1) batching: take raw material and admixture according to the component of bottom plastering gypsum, wherein the component of raw material and admixture all weighs by containing following weight portion in 1kg bottom plastering gypsum:

[0081]

[0082] Among them, semi-dry desulfurization ash is used in the above-mentioned raw materials. In order to ensure the performance of the final plastering gypsum, the corresponding composite retarder needs to be chemically composed of a protein retarder and an organic retarder containing a carboxylic acid (salt) group. Prepared.

[0083] (2) Admixture configuration: Add the composite retarder, water retaining agent, and starch ether weighed in step (1) into the mixer for pre-mixing for 2 to 3 minutes, so that each component is mixed evenly to obtain the admixture;

[0084] (3) Bottom plastering gypsum configuration: Add the d...

Embodiment 3

[0088] The bottom plastering gypsum of the present embodiment is prepared by the following method:

[0089] (1) batching: take raw material and admixture according to the component of bottom plastering gypsum, wherein the component of raw material and admixture all weighs by containing following weight portion in 1kg bottom plastering gypsum:

[0090]

[0091] Among them, semi-dry desulfurization ash is used in the above-mentioned raw materials. In order to ensure the performance of the final plastering gypsum, the corresponding composite retarder needs to be chemically composed of a protein retarder and an organic retarder containing a carboxylic acid (salt) group. Prepared.

[0092] (2) Admixture configuration: Add the composite retarder, water retaining agent, and starch ether weighed in step (1) into the mixer for pre-mixing for 2 to 3 minutes, so that each component is mixed evenly to obtain the admixture;

[0093] (3) Bottom plastering gypsum configuration: Add the d...

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Abstract

The invention discloses bottom layer plastering gypsum and a preparation method thereof. The method comprises the following steps: taking desulfurized building gypsum, semi-dry desulfurized ash and fine aggregate as raw materials, taking a composite retarder, a water-retaining agent and starch ether as admixtures, and preparing the bottom-layer plastering gypsum meeting relevant performance requirements of GB/T 28627-2012 Plastering Gypsum by adjusting the proportion of the composite retarder and the formula of the bottom-layer plastering gypsum. According to the preparation method, consumption of natural resources can be reduced, the current situation of extreme shortage of building gypsum at present can be relieved, the production cost of bottom layer plastering gypsum can be reduced, and meanwhile, the resource utilization level of solid waste such as the semi-dry desulfurization ash of the power plant can be improved through large-scale utilization of the solid waste such as the semi-dry desulfurization ash of the power plant; in addition, Al2O3 and SiO2 in the semi-dry desulfurization ash react with Ca(OH)2 to generate C-S-H and ettringite, so that the strength and the water resistance of the bottom layer plastering gypsum are improved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a bottom plastering gypsum and a preparation method thereof. Background technique [0002] Bottom plastering gypsum is usually a plastering material made of building gypsum, river sand, etc. It is mainly used for base leveling, and it is a new type of leveling material that has developed rapidly in recent years; Limiting the exploitation of natural raw materials leads to a shortage of resources, which leads to a higher cost of plastering gypsum at the bottom layer, and the gypsum-based material is an air-hardening material with poor water resistance. [0003] Semi-dry desulfurization ash is solid waste produced in the desulfurization process of coal-fired power plants. Its main components are calcium sulfite hemihydrate and calcium carbonate, and a small amount is calcium sulfate hemihydrate and calcium hydroxide. Its resource utilization; considering the physical and chemical ...

Claims

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Application Information

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IPC IPC(8): C04B28/14
CPCC04B28/14C04B2111/00482C04B2201/50C04B18/062C04B14/06C04B24/14C04B24/38C04B2103/465C04B2103/22
Inventor 徐兵钱耀丽金芳叶蓓红王栋毅夏月辉黎明严卫斌王轶男
Owner 宝武集团环境资源科技有限公司
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