A method for preparing dehydrated titanium gypsum and products prepared therefrom

Abstract

The invention provides a preparation method of dehydrated titanium gypsum and a product prepared thereby. The preparation method of dehydrated titanium gypsum includes the steps of: (1) adding a solvent into a titanium gypsum raw material, and performing mixing to obtain a titanium gypsum suspension; (2) adding strong acid into the titanium gypsum suspension, and performing stirring to obtain a pickling titanium gypsum suspension; (3) adding a surfactant into the pickling titanium gypsum suspension, and performing stirring to obtain a mixed solution: and (4) subjecting the mixed solution obtained in step (3) to deacidification and dehydration so as to obtain dehydrated titanium gypsum. The dehydrated titanium gypsum obtained by the preparation method has a free water content of only 10-20%, the used process is simple, the dehydration effect is stable, and the reagent is environment-friendly and non-toxic, therefore the method can be used for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic fine chemicals, and relates to a method for preparing dehydrated titanium gypsum and a product obtained therefrom. Background technique [0002] Titanium gypsum is the waste residue produced during the production of titanium dioxide. Its main component is dihydrate gypsum, which has low taste, small particle size and high viscosity, which makes it difficult to deal with titanium gypsum. Drying titanium gypsum will consume a large amount of heat energy, and the above reasons lead to a low comprehensive utilization rate of titanium gypsum resources. Due to the high free water content of titanium gypsum, there is almost no way to reduce its free water. Moreover, the high free water content of titanium gypsum results in a large amount of water for standard consistency and poor mechanical strength, so titanium gypsum cannot be effectively used. At present, the output of titanium gypsum is not as much as that ...

AI Technical Summary

Problems solved by technology

Drying titanium gypsum will consume a lot of heat energy, the above reasons lead to a low comprehensive utilization rate of titanium gypsum resources

Due to the high free water content of titanium gypsum, there is almost no way to reduce its free water at present. Moreover, the high free water content of titanium gypsum results in a large amount of water for standard thickness and poor mechanical strength, so that titanium gypsum cannot be effectively used.

At present, the output of titanium gypsum is not as much as that of desulfurized gypsum and phosphogypsum, and the particle size of titanium gypsum is small, the water content is large, and the research is difficult. As a result, many researchers have less research on titanium gypsum.

The stacking of titanium gypsum not only takes up a lot of land and pollutes the environment, but also is difficult to handle, which brings a great economic burden to enterprises such as titanium dioxide factories.

[0003] At present, the dehydration of gypsum is basically carried out by machines, such as CN202909535U inventing a gypsum dehydrator for dehydration, and CN108569853A inventing a dehydration system with a dehydration machine to dehydrate industrial by-product gypsum. The industrial by-product gypsum is effective, but titanium gypsum contains a large amount of free water due to its small particle size, generally around 50%, and the water cannot be removed by machines, and the free water content of titanium gypsum is still high

[0004] CN109734119A discloses a method for preparing white gypsum by removing impurities from titanium gypsum, which includes the step of removing impurities and dehydrating titanium gypsum, specifically: dissolving titanium gypsum with sulfuric acid, adding calcium carbonate to remove impurities, and finally drying and dehydrating. Although the method is helpful for removing impurities to obtain titanium gypsum with high purity, it cannot remove its free water very well, and the obtained titanium gypsum still has high water content and high viscosity

Images