Gypsum cooling and aging process

Abstract

The invention discloses a gypsum cooling and aging process. The process comprises the following steps: (1) quantitatively conveying a high-temperature building gypsum raw material containing soluble anhydrous calcium sulfate to a cooling chamber; (2) providing cold air for a cooling chamber to achieve the cooling effect, performing gas-solid mixing in the cooling chamber, generating a gas-solid mixture, and inputting water mist and the cold air into an evaporation chamber, and generating gaseous damp and hot airflow under the heat exchange effect of liquid water in the evaporation chamber andthe cooling chamber; (3) the gas-solid mixture and warm air flow enter an aging chamber to be subjected to a gas-liquid-solid three-phase mixing aging reaction, along with secondary gas-solid mixing cooling, part of heat needing to be cooled of the materials is used for evaporating liquid water by fully utilizing the heat of the hot materials, and the liquid water evaporation needs a large amountof latent heat of vaporization to absorb part of the heat of the materials so that the cooling effect is achieved; and meanwhile, the evaporated liquid water is in direct contact with the material ina water vapor form so that the situations of bonding, non-uniform aging and the like caused by direct contact between the liquid fog drops and the material are avoided, and the use amount of wet air is reduced.

Description

technical field [0001] The invention belongs to the field of building material preparation, and in particular relates to a process for rapid cooling and aging of calcined building gypsum, in particular to a process for rapid cooling and aging of building gypsum with high soluble anhydrous calcium sulfate content. Background technique [0002] The production of building gypsum powder is the process of calcining dihydrate gypsum (DH) into hemihydrate gypsum (HH). In order to improve the conversion rate of hemihydrate gypsum, there must be a certain degree of overburning, so the calcination process will be accompanied by a certain amount of soluble anhydrite (AⅢ) and insoluble anhydrite (AⅡ). Therefore, the calcined product is composed of hemihydrate gypsum, soluble anhydrite, insoluble anhydrite, and a small amount of unreacted dihydrate gypsum and impurities. [0003] The most influential factor on product performance is the content of hemihydrate gypsum, dihydrate gypsum an...

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