Device and method for producing type II anhydrous gypsum from desulfurized gypsum

Anhydrous gypsum and desulfurized gypsum technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium sulfate, etc., can solve problems such as increased processing costs, poor stability, and close temperature, and improve resource utilization The effect of high efficiency, stable performance and stable quality
CN110803877APending Publication Date: 2020-02-18JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
Publication Date
2020-02-18

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Abstract

The invention provides a device and a method for producing type II anhydrous gypsum from desulfurized gypsum. The device comprises a drying unit, a calcining unit and a product collecting unit which are sequentially connected, wherein the drying unit comprises a crushing device and at least one-stage drying device, and the calcining unit comprises a fluidized calcining device. According to the device disclosed by the invention, the desulfurized gypsum is accurately converted into the II-type anhydrous gypsum through the combination of drying and calcining processes, oxidation of calcium sulfite and decomposition of organic matters in the desulfurized gypsum can be realized, the impurity removal rate reaches more than 99%, and the influence of harmful impurities on gypsum products is greatly reduced; according to the method, when super sulfate cement is taken as a target product, the lowest limit value of chloride ions in desulfurized gypsum raw materials is increased, and the pretreated water consumption and secondary water pollution are indirectly reduced; according to the invention, the comprehensive utilization efficiency of the desulfurized gypsum is improved, the super sulfatecement is further compounded, the product has stable performance and high strength, and the application way of the desulfurized gypsum is expanded.
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Description

technical field

[0001] The invention belongs to the technical field of solid waste utilization, and relates to a device and method for producing Type II anhydrite from desulfurized gypsum. Background technique

[0002] With the development of the national economy, fossil energy such as coal and petroleum is used in large quantities, and SO will be produced during the combustion process. 2 , NO x Among them, thermal power generation is one of the important sources of gas pollutants, while the demand for electricity continues to increase, making the amount of pollutants still increasing. Desulfurization and denitrification have become necessary environmental protection measures for every coal-fired or oil-fired device. At present, the desulfurization processes mainly include limestone-gypsum wet desulfurization, limestone-gypsum dry or semi-dry desulfurization, and ammonia desulfurization, among which limestone-gypsum wet desulfurization process accounts for about 90% and is ...

Claims

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