Method for preparing gypsum-based self-leveling material by using desulfurization gypsum

Abstract

The invention discloses a method for preparing gypsum-based self-leveling material for use in building material industry. The main material of the gypsum-based self-leveling material is desulfurized gypsum which is a desulfurization product from power plants. The method comprises: firstly, calcining the desulfurized gypsum in a calcining kiln; and secondly, mixing calcined gypsum powder accountingfor 50 to 78 percent of the total weight of the material, a water reducer accounting for 0.1 to 1 percent of the total weight of the material, a retarder accounting for 0.01 to 0.5 percent of the total weight of the material, a water-retaining agent accounting for 0.02 to 5 percent of the total weight of the material, a reinforcing agent accounting for 0 to 10 percent of the total weight of the material, re-dispersible emulsion powder accounting for 0.2 to 1.5 percent of the total weight of the material, a defoamer accounting for 0.05 to 0.2 percent of the total weight of the material, riversand accounting for 25 to 45 percent of total weight of the material and a filler accounting for 0 to 20 percent of the total weight of the material to obtain a the high-performance gypsum-based product. The invention provides a new method for producing high-quality gypsum-based self-leveling material characterized by high strength, high flowability, small contraction deformation and low cost by using the desulfurized gypsum, which provides a new way of comprehensively using desulfurized gypsum that is a solid waste and fills the blank that the preparation of gypsum-based self-leveling materials from desulfurized gypsum lacks in China.

Description

Technical field: [0001] The invention relates to a gypsum-based self-leveling material and a preparation method thereof, in particular to a method for preparing a gypsum-based self-leveling material by using desulfurized gypsum. Background technique: [0002] With the construction of a large number of desulfurization projects in thermal power plants in my country, the emission of desulfurized gypsum has increased sharply. At present, the utilization rate of desulfurized gypsum in my country is still very low, and most of them are still stored in storage. It has become the second largest after thermal power plant fly ash. Large solid waste. If the desulfurization gypsum is discarded and stockpiled, a special storage site needs to be built, which not only requires a huge investment, occupies a lot of valuable land resources, but also has an adverse impact on the surrounding living environment. Therefore, the use of desulfurized gypsum has an important impact on national enviro...

AI Technical Summary

Problems solved by technology

These two mold powders have their own advantages and disadvantages. The former has superior performance but high cost, while the latter has low cost but poor strength.

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