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Method for preparing calcium sulfate by using calcium chloride

A technology of calcium sulfate and calcium chloride, applied in the field of hydrometallurgy, can solve the problems of low output, high cost, limited application of whiskers, etc., and achieves low equipment investment cost, simple and easy-to-control operation, and large industrial potential value. Effect

Pending Publication Date: 2021-11-05
江西思远再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the high cost and low yield of whiskers of various substances also limit the more general application of whiskers, so it is of great significance to develop methods for preparing whiskers with high yield and low cost

Method used

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  • Method for preparing calcium sulfate by using calcium chloride
  • Method for preparing calcium sulfate by using calcium chloride
  • Method for preparing calcium sulfate by using calcium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 2L of calcium chloride solution with a concentration of 3mol / L into the beaker, under the condition of a constant temperature water bath at 40°C, control the stirring speed at 200r / min, add 800ml of sulfuric acid with a concentration of 6M into the beaker within 2h, and equilibrate for 2h after the reaction. Calcium sulfate dihydrate can be obtained by filtration.

Embodiment 2

[0032] Add 2L of calcium chloride solution with a concentration of 3mol / L into the beaker, under the condition of a constant temperature water bath at 70°C, control the stirring speed at 200r / min, add 700ml of sulfuric acid with a concentration of 6M into the beaker within 2h, and equilibrate for 2h after the reaction. Filter to get calcium sulfate hemihydrate.

Embodiment 3

[0034] Add 2L of calcium chloride solution with a concentration of 3mol / L into the beaker, under the condition of a constant temperature water bath at 80°C, control the stirring speed at 200r / min, add 900ml of sulfuric acid with a concentration of 6M into the beaker within 2h, and equilibrate for 6h after the reaction. Filter to get anhydrous calcium sulfate.

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Abstract

The invention discloses a method for preparing calcium sulfate by using calcium chloride. The method comprises the following steps: 1) weighing a calcium chloride solution, and adding concentrated sulfuric acid into the calcium chloride solution for a crystallization reaction at a reaction temperature of 20-80 DEG C, wherein the concentrated sulfuric acid is continuously added under the condition of stirring, and the addition is completed within 1-4 hours; and 2) conducting aging for a period of time after the crystallization reaction is finished, and then performing filtering to obtain regenerated hydrochloric acid and gypsum. According to the method for preparing the calcium sulfate by using the calcium chloride with the above structure, calcium sulfate whiskers can be generated through continuous crystallization, and the generated hydrochloric acid can be industrially and repeatedly utilized.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for preparing calcium sulfate by using calcium chloride. Background technique [0002] Whiskers are artificially grown fibrous single crystals with micron-nano diameters. Whiskers of the same kind have the highest strength and elastic modulus, so they are widely used as reinforcing and toughening components of composite materials. At the same time, the high cost and low yield of whiskers of various substances limit the more general application of whiskers, so it is of great significance to develop methods for preparing whiskers with high yield and low cost. Calcium sulfate whisker refers to the fibrous single crystal whose main chemical composition is calcium sulfate. In fact, there are three kinds of phase composition: gypsum (calcium sulfate dihydrate, CaSO 4 2H 2 O), hemihydrate gypsum (half calcium sulfate of crystal water, CaSO 4 1 / 2H 2 O), anhydrite (an...

Claims

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Application Information

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IPC IPC(8): C30B7/14C30B29/46C30B29/62
CPCC30B7/14C30B29/62C30B29/46
Inventor 赵尹蒋航宇董飘平刘宇豪王璐
Owner 江西思远再生资源有限公司
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