Calcium sulphate crystal whisker preparation method with sea water bittern as raw material

Abstract

The invention relates to a method for preparing calcium sulphate crystal whisker. The method takes sea water and bittern as raw materials, combines the comprehensive utilization of the sea water, lowers the cost, simplifies the process and is easy to realize the industrialization. The method comprises the following processes of evaporating crystallization, crystal whisker conversion, filtration and washing and salting-out evaporation. The concentrated sea water after desalted or the moderate bittern in the salt manufacturing process is put in an evaporated crystallizer to be evaporated and concentrated so that the granular calcium sulphate crystal is separated out; the calcium sulphate crystal and a feed liquid prepared by the mother solution after the evaporation according to the solid / liquid mixture ratio of between 5 and 10 percent are put in a reaction kettle to translate into the calcium sulphate crystal whisker, the reaction temperature is between 100 and 200 DEG C, the reactionpressure is between 0.1 and 0.5 MPa, and the reaction time lasts for 0.5 to 2 hours; the calcium sulphate crystal whisker is filtered, washed and dried so that the calcium sulphate crystal whisker product is prepared; and the remaining mother solution obtained by filtering the crystal whisker converting reaction liquid is evaporated and concentrated further to separate out the sodium chloride crystal.

Description

technical field

[0001] The invention relates to the production technology of inorganic salt whiskers, in particular to the production technology of calcium sulfate whisker materials. Background technique

[0002] Calcium sulfate whiskers refer to anhydrous calcium sulfate (CaSO 4 ) fibrous single crystal, the average aspect ratio is 50-80, the crystal structure is complete, the size is stable, the cross section is specific, and the strength and modulus are close to the theoretical values ​​of crystal materials. Calcium sulfate whiskers have excellent physical, chemical and mechanical properties such as high temperature resistance, acid and alkali resistance, chemical corrosion resistance, good electrical insulation, high strength, good toughness and compatibility, and easy surface treatment. The material is widely used in the manufacture of plastics, rubber, adhesives, friction materials, coatings, paints, heat insulation materials, lightweight building materials, etc., and...