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

A technology of calcium sulfate whiskers and brine, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve the problems of not forming a more suitable preparation method and process technology, and achieve easy industrialization , Saving fresh water resources and reducing costs

Active Publication Date: 2011-04-27
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of salt gypsum is calcium sulfate dihydrate (CaSO 4 2H 2 O), can be used as the raw material of producing calcium sulfate whisker, for this reason, utilize salt gypsum to produce the research and the test of calcium sulfate whisker constantly in progress, but, still do not form more suitable preparation method and process technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 10 liters of concentrated seawater with a concentration of 6.5Bh containing Ca 2+ 0.63 g / L, Mg 2+ 2.38 g / L, SO 4 2- 4.49 g / L and Cl - 34.41 grams per liter, put it into an evaporation crystallizer for evaporation and concentration, and the feed liquid is concentrated to 23Bh to stop evaporation. There are 22 grams of calcium sulfate dihydrate and 2200 milliliters of mother liquor in the evaporation and crystallization completion liquid.

[0027] Transfer 22 grams of calcium sulfate dihydrate and 300 milliliters of mother liquor in the evaporated and crystallized liquid into a pressure reactor by means of precipitation separation. While stirring at a speed of 80 rpm, heat and maintain a temperature of 120°C and a pressure of 0.2 MPa, the reaction time is 2 hours.

[0028] After the reaction is completed, the reaction completed liquid is filtered, and the filtered solid-phase calcium sulfate hemihydrate whiskers are separated from the mother liquor. Then the ca...

Embodiment 2

[0031] Take 10 liters of concentrated seawater with a concentration of 6.5Bh containing Ca 2+ 0.63 g / L, Mg 2+ 2.38 g / L, SO 4 2- 4.49 g / L and Cl - 34.41 grams per liter, put it into an evaporation crystallizer for evaporation and concentration, and the feed liquid is concentrated to 23Bh to stop evaporation. There are 21 grams of calcium sulfate dihydrate and 2230 milliliters of mother liquor in the evaporation and crystallization completion liquid.

[0032] 21 grams of calcium sulfate dihydrate and 380 milliliters of mother liquor in the evaporation and crystallization completion liquid are transferred to a pressure reactor by means of precipitation separation, and while stirring at a speed of 200 rpm, heat and maintain a temperature of 200° C. and a pressure of 0.5MPa, the reaction time is 0.5 hours.

[0033] After the reaction is completed, the reaction completed liquid is filtered, and the filtered solid-phase calcium sulfate hemihydrate whiskers are separated from the...

Embodiment 3

[0036] Take 10 liters of seawater brine with a concentration of 9.8Bh containing Ca 2+ 0.95 g / L, Mg 2+ 3.60 g / L, SO 4 2- 6.75 g / L and Cl - 51.85 grams per liter, put it into an evaporation crystallizer for evaporation and concentration, and the feed liquid is concentrated to 22Bh to stop evaporation. There are 33 grams of calcium sulfate dihydrate and 3350 milliliters of mother liquor in the evaporation and crystallization completion liquid.

[0037] Transfer 33 grams of calcium sulfate dihydrate and 450 milliliters of mother liquor in the evaporated and crystallized liquid into a pressure reactor by means of precipitation separation. While stirring at a speed of 100 rpm, heat and maintain a temperature of 120°C and a pressure of 0.5MPa, the reaction time is 0.5 hours.

[0038]After the reaction is completed, the reaction completed liquid is filtered, and the filtered solid-phase calcium sulfate hemihydrate whiskers are separated from the mother liquor, then the solid-pha...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B29/62C01F11/46
Inventor 张家凯张雨山曹冬梅王玉琪刘骆峰
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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