Renewable gypsum powder for building wall and preparation method of gypsum powder

Abstract

The invention discloses renewable gypsum powder for a building wall and a preparation method of the gypsum powder. The renewable gypsum powder is prepared from, by weight, 260-300 parts of salt gypsum, 20-30 parts of chaotropic agent and 20-25 parts of additive, wherein the chaotropic agent is prepared from, by weight, 1-3 parts of sodium diethylene triamine pentacetate, 3-7 parts of diethylenetriamine penta(methylene phosphonic acid) heptasaodium salt, 5-7 parts of ketobutyric acid sodium salt, 5-7 parts of potassium hexatitanate and 10-12 parts of potassium diformate, and the additive is prepared from, by weight, 15-20 parts of magnesium hexasilicate, 41.5-56.5 parts of zinc powder, 35-45 parts of quartz powder and 10.5-12.5 parts of aluminosilicate. The renewable gypsum powder is prepared by salt gypsum, so waste is turned into wealth, pollution is reduced, environment protection is achieved, the prepared renewable gypsum powder has a great improvement in mechanical strength, waterproofness and humidity resistance, and when the prepared renewable gypsum powder is used in the building wall, energy conservation and environment protection are achieved.

Description

technical field [0001] The invention relates to the technical field of gypsum powder for construction, in particular to a recycled gypsum powder for building walls and a preparation method thereof. Background technique [0002] Salt gypsum is the waste residue produced by the salt industry, and its main component is calcium sulfate dihydrate containing a large amount of sodium chloride. Due to the high evaporation rate and high calcium sulfate nucleation rate in the salt production process, the precipitated gypsum particle size is small, the median particle size is about 4-6 microns, and the specific surface area is large, so it becomes very difficult to wash the salt gypsum to separate sodium chloride Moreover, the energy consumption of the washing and separation process is too high, which also makes it difficult to reuse the salt gypsum. At present, a large amount of salt gypsum discharged from various salt factories every year is either dumped in the gullies on land, or ...

AI Technical Summary

Problems solved by technology

However, the mining of too much ore and gypsum will bring the risk of subsidence to the ground in the mining area, and will also pollute the groundwater resources in the gypsum mining area. Therefore, using salt gypsum to make recycled gypsum powder is a good way to save energy and protect the environment.

[0004] And when using gypsum powder to make building walls at present, in order to ensure that the slurry has a certain fluidity, the amount of water mixed in the stirring process of gypsum slurry is higher than the amount of water required in theory. When the gypsum slurry hardens into a building wall Finally, the excess water escapes from the building wall, resulting in a large number of voids and capillary pores. Repeated migration in the building wall, resulting in a large water absorption rate of the building wall

The hydration product of building gypsum powder has a high solubility of calcium sulfate dihydrate, and the thermal stability of the crystal contact point is not high, it is easy to dissolve under the action of water, destroy the crystal structure, and make the strength and hardness of the building wall decline

In summary, the building walls made of gypsum powder have the problems of low strength, poor waterproof and moisture-proof performance, insufficient durability and low service life during use.