Preparation method of desulfurized building gypsum for powder gypsum mortar

Abstract

The invention discloses a preparation method of desulfurized building gypsum for powder gypsum mortar, which particularly comprises the following steps: 1) selecting flue gas desulfurized gypsum with a water content of below 10%; 2) allowing the flue gas desulfurized gypsum to enter a steam rotary kiln by a desulfurized gypsum charging / conveying system for drying and calcination; detecting the material temperature, and performing cloth-bag dusting; 3) performing cooling and homogenization in a cooling rotary kiln; 4) grinding in a grinding machine to obtain the desulfurized building gypsum, performing product detection, and keeping in reserve after qualification. The desulfurized building gypsum prepared by the invention has the characteristics of high purity, low content of the two aqueous phases, low coagulation time, high absolute dry strength, and the like; when the desulfurized building gypsum is used to prepare powder gypsum mortar, the retarder mixing amount is decreased and the aggregate mixing amount is increased, and the material cost is greatly reduced. Meanwhile, the mortar prepared by the desulfurized building gypsum has quite stable performance, and thus facilitates large-area construction, popularization and application. A good approach for the comprehensive resource utilization of desulfurized gypsum is provided.

Description

[0001] technical field [0002] The invention discloses a method for preparing desulfurized building gypsum for powder gypsum mortar, in particular a method for preparing desulfurized building gypsum from flue gas desulfurized gypsum, and the application of the desulfurized building gypsum on powder gypsum mortar. [0003] Background technique [0004] With the country's emphasis on power environmental protection, especially the reduction of sulfur dioxide and air pollution, the flue gas desulfurization transformation of thermal power plants in my country has entered a period of rapid growth. As a result, a large amount of flue gas desulfurization gypsum is produced. About 8 million tons of flue gas desulfurization gypsum are produced in my country every year. By 2010, if all thermal power plants in my country are equipped with desulfurization devices, the output of desulfurization gypsum will increase dramatically by more than 40 million tons. [0005] In foreign countrie...

AI Technical Summary

Problems solved by technology

However, in my country, due to the immature technology of desulfurized gypsum products, the lack of relevant technical standards, high processing costs, and high energy consumption, desulfurized gypsum cannot be efficiently used in my country's building materials industry, and a large amount of desulfurized gypsum cannot be consumed. Facing the plight of being stacked and landfilled, it affects the ecological environment and the safe operation of the power plant

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