Autoclaved desulfurized gypsum aerated building block without calcination

Abstract

The invention relates to an autoclaved desulfurized gypsum aerated building block without calcination. The autoclaved desulfurized gypsum aerated building block is formed by directly modifying solid wastes (such as desulfurized gypsum) produced by wet desulphurization in thermal power plants, without calcinations. The invention relates to the technical field of resourceful comprehensive utilization. The aerated building block is prepared from the components of, by weight, 60-75 % of original state dihydrate desulfurized gypsum, 10-30% of vulcanic ash active mineral materials, 10-25% of active materials, 0.5-2% of accelerating materials, 0.5-2.0% of early strength materials, 0.1- 0.5% of gas forming materials. The preparation method comprises the steps of preparing raw materials, slurrying, pouring, standing for maintenance, cutting, and autoclaving. By preparing the aerated building block, a lot of the solid wastes-dihydrate desulfurized gypsum can be consumed, and resources can be saved because the aerated building block is prepared by direct modification and utilization without processes of calcining and drying. The aerated building block is energy-saving, environment-friendly, low carbon and benefit for waste, and has good product performance, high strength, good water resistance, and low cost.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial solid waste resources. It specifically relates to a kind of solid waste produced after wet desulfurization of thermal power plants - desulfurization gypsum, without drying and calcination, directly undergoes chemical, physical and temperature reactions, and undergoes modification to make air hardness and water Hard material, transformed into a hydraulic material. Background technique [0002] my country is a big thermal power generation country, and its annual SO2 emission ranks first in the world, at 25 million tons. For this reason, the country adopts mandatory desulfurization measures. In this way, the solid waste produced by desulfurization - desulfurization gypsum, has an annual discharge of 50-70 million tons. The utilization rate is only 30%. 70% of them are used after calcination and drying. Cause large investment, secondary pollution, secondary energy ...

AI Technical Summary

Problems solved by technology

Cause large investment, secondary pollution, secondary energy consumption, unstable product quality, poor water resistance, low strength

The unused 70% of dihydrate desulfurized gypsum is discarded or piled up by buying land, which not only increases the burden on enterprises, but also pollutes water sources, soil, and the atmosphere.

The obvious disadvantage of this type of product is that the drying shrinkage value is large, which is easy to cause cracking