Method for producing cement retarder by carbide slag desulfurization

Abstract

The invention relates to a process for producing cement retarders, which uses acetylene sludge as raw materials to react with SO2 in flue gases to produce desulfurized gypsum which replaces natural gypsum to be used as production raw materials in cement plants to decarbolize, thereby producing cement retarders. The invention adopts acetylene sludge waste in chemical plant as main raw materials, adds water to modulate acetylene sludge with consistency of 20%-30% as a desulfurizer, sprays the desulfurizer into a flue gase thionizer of a coal-fired power plant to react with SO2 in flue gases to produce desulfurized gypsum, the desulfurized gypsum becomes granulated material via beading, low-temperature drying or drying, beading, thereby obtaining the cement retarders in cement plants. The invention utilizes the characters that Ca (OH) 2 which is the main chemical composition of acetylene sludge absorbs SO2 well, uses the composition as a desulfurizer for flue gas desulfurizing in an electric power plant, and changes the waste into valuable, the desulfurized gypsum after desulfurizing and dealing all replaces natural gypsum to act as the cement retarders for cement production, thereby resolving the pollution problems of acetylene sludge and desulfurized gypsum, being capable of achieving co-production of chemical engineering, electricity power and cement, and realizing the zero draining of industrial residues.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection and resource comprehensive utilization, in particular to a kind of 2 A method for producing cement retarder by desulfurizing carbide slag to replace natural gypsum as cement retarder in cement plant through reaction. Background technique: [0002] Carbide slag is the waste residue discharged from the production of acetylene gas, polyvinyl chloride, polyvinyl alcohol and other products. Its main component is calcium hydroxide, and about 80% of the particles are between 10 and 50 microns. poor. The discharge of carbide slag occupies fertile land and pollutes the environment. [0003] Coal is the main fuel for electric power production in the world today (coal contains sulfur). The sulfur dioxide produced by coal-fired power plants pollutes the air, forms acid rain, and causes serious environmental problems, which has attracted the attention of all countries in the world. Partici...

AI Technical Summary

Problems solved by technology

The moisture content of desulfurized gypsum is generally about 15%. Due to the high moisture content and strong viscosity, it is easy to adhere to various equipment during the production process of loading, lifting and transportation, causing material blockage and affecting the normal production process.

[0011] 3. The color is dark

Desulfurized gypsum with good texture is pure white, but common ones are dark gray or yellowish, which will affect the appearance as plaster plaster and decorative plaster

The main reason is that the efficiency of the flue gas dust removal system is not high, so that the desulfurization gypsum contains more fly ash, and the second is the influence of impurities such as iron and other impurities in the lime