Prepartion method of calcium sulphate dihydrate crystal whisker

A technology of calcium sulfate dihydrate and whiskers, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve the problems of large amount of industrial production wastewater and high production costs, and achieve low cost, The effect of simple process

Inactive Publication Date: 2009-11-25
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many methods for preparing calcium sulfate whiskers at present, such as the hydrothermal method adopted in patents CN1261624C, CN1317430C, and CN1598083C, and the method of adding sulfuric acid to slaked lime slurry adopted in patents CN1955345C and CN1324170C. These methods have their own characteristics, but all have relatively high production costs. High, the disadvantage of large amount of industrial production wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0008] Prepare 10 liters of 0.25mol / L calcium chloride aqueous solution, add 20 grams of dodecyl phosphate potassium salt and 12 grams of nonylphenol polyoxyethylene ether (TX10) and stir to dissolve, add 50% sulfuric acid solution 0.26 liter, the reaction solution was allowed to stand for 6 hours, and then filtered. The filter material was calcium sulfate dihydrate whiskers with a length of 40-70 microns and a diameter ratio of 30-50. Add 1 gram of dodecyl phosphate potassium salt, 0.6 gram of nonylphenol polyoxyethylene ether (TX10) and 0.3 liters of 10% HCl to the filtrate, then add 600 grams of 300 mesh limestone and stir the reaction for 1 hour before filtering, and the filtrate is stirred Add 0.26 liters of 50% sulfuric acid solution, and continue to generate calcium sulfate dihydrate whiskers after standing for 4-6 hours. After 10 cycles like this, the morphology of the generated calcium sulfate dihydrate whiskers remains unchanged, and the product quality is stable.

example 2

[0010] Prepare 10 liters of 0.4mol / L calcium chloride aqueous solution, add 30 grams of dodecyl phosphate potassium salt and 18 grams of nonylphenol polyoxyethylene ether (TX10) and stir to dissolve, add 10% sulfuric acid solution 2.1 while keeping stirring liter, the reaction solution was allowed to stand for 4 hours, and then filtered. The filter material was calcium sulfate dihydrate whiskers with a length of 30-60 microns and a diameter ratio of 30-50. Add 1 gram of dodecyl phosphate potassium salt, 0.6 gram of nonylphenol polyoxyethylene oxide ether (TX10) and 0.3 liters of 10% HCl to the filtrate, then add 600 grams of 100 mesh limestone and stir for 2 hours before filtering, and the filtrate is stirred Add 2.1 liters of 10% sulfuric acid solution, and continue to generate dihydrate calcium sulfate whiskers after standing for 4-6 hours. After 10 cycles like this, the morphology of the generated calcium sulfate dihydrate whiskers remains unchanged, and the product quality...

example 3

[0012] Prepare 10 liters of 0.33mol / L calcium chloride aqueous solution, add 25 grams of dodecyl phosphate potassium salt and 15 grams of nonylphenol polyoxyethylene ether (TX10) and stir to dissolve, add 20% sulfuric acid solution 0.89 liter, the reaction solution was allowed to stand for 5 hours, and filtered. The filter material was calcium sulfate dihydrate whiskers with a length of 30-60 microns and a diameter ratio of 30-50. Add 1 gram of dodecyl phosphate potassium salt, 0.6 gram of nonylphenol polyoxyethylene ether (TX10) and 0.3 liters of 10% HCl to the filtrate, then add 600 grams of 200 mesh limestone and stir for 2 hours before filtering, and the filtrate is stirred Add 0.89 liters of 20% sulfuric acid solution, and continue to generate calcium sulfate dihydrate whiskers after standing for 4-6 hours. After 10 cycles like this, the morphology of the generated calcium sulfate dihydrate whiskers remains unchanged, and the product quality is stable.

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PUM

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Abstract

The invention relates to a method for preparing calcium sulphate dihydrate crystal whisker, adding dodecyl phosphate potassium and nonylphenol polyethoxylate (TX10), and adding dilute sulphuric acid in agitation, standing the reaction solution for four to six hours, filtering, the filtering material is calcium sulphate dihydrate crystal whisker. Reacting filtrate with limestone to regenerate calcium chloride solution, adding dilute sulphuric acid sequentially to generate calcium sulphate dihydrate crystal whisker once more. The method is using limestone and dilute sulphate acid as raw materials to prepare calcium sulphate dihydrate crystal whisker, possessing characteristics of simple process and low cost, which is suitable for industrial production.

Description

Technical field: [0001] The invention relates to the fields of inorganic chemical industry and inorganic materials, in particular to a method for preparing calcium sulfate dihydrate whiskers. Background technique: [0002] Whiskers refer to whisker-like single crystals grown in the form of single crystals whose shape is similar to short fibers but whose radial dimension is much smaller than that of short fibers. It usually has a uniform cross section, complete shape, and perfect internal structure. Whisker is a single crystal with a one-dimensional advantage, few lattice defects, and its strength is close to the theoretical value. It is the strongest solid known so far and has excellent mechanical properties. [0003] Calcium sulfate whisker is a kind of mineral fiber that is harmless or minimally harmful to the human body. Compared with other inorganic whiskers, it has the advantages of the cheapest price and the lowest toxicity, and has the advantages of high temperature r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/22C30B7/14C01F11/46
Inventor 朱伟长郑翠红俞海云闫勇韩甲兴许苗苗徐兰
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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