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Preparation method of gypsum binder

A binder and gypsum technology, which is applied in the field of preparation of gypsum binders, can solve problems such as unfavorable storage, achieve the effects of improving strength, increasing flexural resistance, and ensuring water retention

Active Publication Date: 2022-07-29
北京北科环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main raw material used in this patent is wet desulfurization gypsum. The main component of desulfurization gypsum is calcium sulfate hemihydrate, which is produced by dehydrating the industrial by-product gypsum produced by wet desulfurization process at 105-170°C in iron and steel or electric power enterprises. It is a good building material that can be used directly without any excitation treatment. It is widely used in the market, but the gypsum binder prepared by this patent is a liquid slurry, which is not conducive to preservation. It needs to be placed in a mixer when used. On-site preparation

Method used

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  • Preparation method of gypsum binder

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Experimental program
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Effect test

Embodiment 1

[0033] Pour the semi-dry desulfurization ash into the rotary kiln at 500-650℃ for oxidation and carbonization treatment with air and carbon dioxide (blast furnace flue gas). Desulfurized ash used 0.8m 3 , the ratio of the introduction amount of carbon dioxide in the semi-dry desulfurization ash and carbon dioxide source gas is 0.3 m per ton of semi-dry desulfurization ash 3), grind the treated desulfurization ash until the sieve residue of 0.3mm square-hole sieve is less than 1.0%, and the sieve residue of 0.15mm square-hole sieve is less than 10%, and then weigh the following materials by weight: 60 parts by weight of ash, 40 parts by weight of hemihydrate gypsum, 0.15 wt % of citric acid (setting retarder is also called binder), 0.05 wt % of hydroxypropyl methyl cellulose ether, and can be mixed evenly in 0.5 wt % of dispersing rubber powder That is, a gypsum binder is obtained, wherein the retarder, the water-retaining agent, and the reinforcing agent are added by external...

Embodiment 2

[0037] Pour the semi-dry desulfurization ash into the rotary kiln at 500-650℃ for oxidation and carbonization treatment with air and carbon dioxide (blast furnace flue gas). Desulfurization ash use 0.65m 3 , the ratio of the amount of carbon dioxide introduced into the semi-dry desulfurization ash to the carbon dioxide source gas is 0.38m per ton of semi-dry desulfurization ash 3 ), grind the treated desulfurization ash until the sieve residue of 0.3mm square-hole sieve is less than 1.0%, and the sieve residue of 0.15mm square-hole sieve is less than 10%, and then weigh the following materials by weight: 65% of the ground desulfurization ash , 35% of hemihydrate gypsum, 0.1% of citric acid, 0.07% of hydroxypropyl methyl cellulose ether, and 0.8% of disperse rubber powder can be mixed evenly to obtain gypsum binder, wherein the retarder, water retention agent and enhancer are by way of external doping. After mixing the above materials evenly, add 44% water and stir evenly, an...

Embodiment 3

[0041] The semi-dry desulfurization ash is introduced into the rotary kiln at 500-650℃ for oxidation and carbonization treatment, and the treated desulfurization ash is ground to a 0.3mm square hole sieve with less than 1.0% sieve residue and a 0.15mm square hole sieve. The remaining amount is less than 10%, and then weigh the following materials by weight: 70% of ground desulfurization ash, 30% of hemihydrate gypsum, 0.1% of citric acid, 0.07% of hydroxypropyl methyl cellulose ether, disperse rubber powder The gypsum binder is obtained by mixing 1.0% evenly, wherein the setting retarder, the water-retaining agent and the reinforcing agent are added in the form of external admixture. After mixing the above materials evenly, add 42% water and stir evenly, and then pour the uniformly stirred slurry into shape, and test the relevant performance indicators after hardening and demoulding, as shown in Table 1.

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Abstract

The invention relates to a preparation method of a gypsum binder, which comprises the following steps: performing oxidation and carbonation treatment on semi-dry desulfurization ash at the same time, then mixing the semi-dry desulfurization ash with a specific amount of an exciting agent, a retarder, a water-retaining agent and a binder, and the like. The coating has the advantages of being not prone to cracking and falling off and the like, and has good construction performance. When in use, water in a specific proportion can be added to be used as a binder, so that the semi-dry desulfurization ash is convenient to store, transport and use, resource utilization of the semi-dry desulfurization ash is realized, a large amount of desulfurization ash can be consumed, the problems of large amount of stockpiling and pollution of the semi-dry desulfurization ash at present are solved, and the environmental protection pressure of iron and steel enterprises is relieved; and a new way is opened up for resource utilization of the semi-dry desulfurization ash.

Description

technical field [0001] The invention belongs to the field of comprehensive treatment of industrial solid waste, and particularly relates to a preparation method of a gypsum binder. Background technique [0002] Semi-dry desulfurization ash is a solid waste produced by the use of semi-dry desulfurization process to desulfurize flue gas in the iron and steel industry or power industry. The composition of semi-dry desulfurization ash is complex, mainly containing CaSO produced by desulfurization 3 As well as unreacted CaO to achieve ultra-low emission standards. of which CaSO 3 The hydration reaction is slow, the stability is poor, and CaO has a large dry shrinkage. Therefore, if the semi-dry desulfurization ash is directly used as a building material, it is prone to structural cracking, insufficient strength, and long setting time. Difficult to use resources. At present, semi-dry desulfurization ash is mainly stockpiled, outsourced, and landfilled, and it is difficult to f...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B11/26
CPCC04B28/144C04B11/26C04B2111/00646C04B2201/50C04B2103/22C04B2103/465C04B2103/44C04B22/143Y02W30/91
Inventor 冷廷双彭建明张秋林马兆军
Owner 北京北科环境工程有限公司
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