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Preparation of hydrophobic nature calcium sulphate crystal whisker with liquid phase method of sodium sulfate wastewater in situ

A calcium sulfate whisker, in-situ preparation technology, applied in calcium/strontium/barium sulfate, single crystal growth, crystal growth, etc.

Inactive Publication Date: 2009-01-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there are no literature and patent reports on the synthesis of hydrophobic calcium sulfate whiskers as a reinforcing agent at home and abroad, especially there is no research report on the synthesis of hydrophobic calcium sulfate whiskers by in-situ one-step precipitation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. Put 50ml of calcium nitrate solution with a concentration of 0.5mol / l in a three-necked flask and put it in a water bath at 30°C, add a surfactant and stir evenly.

[0012] 2. Under stirring, add a certain amount of sodium sulfate wastewater;

[0013] 3. Keep the temperature and continue to stir for 3 hours to form a white precipitate;

[0014] 4. Filter and wash the above product;

[0015] After dehydration and drying at 5.60°C, a calcium sulfate whisker powder with a diameter of 2 μm, a length of 30 μm, and an aspect ratio of 15 was obtained.

Embodiment 2

[0017] 1. Put 50ml of calcium salt solution with a concentration of 0.5mol / l in a three-necked flask and put it in a water bath at 50°C, add surfactant and stir evenly.

[0018] 2. Under stirring, add a certain amount of sodium sulfate wastewater;

[0019] 3. Keep the temperature and continue to stir for 3 hours, a small amount of product floats on the water surface;

[0020] 4. Filter and wash the above product;

[0021] After dehydration and drying at 5.60°C, a calcium sulfate whisker powder with a diameter of 2 μm, a length of 60 μm, and an aspect ratio of 30 was obtained.

Embodiment 3

[0023] 1. Put 50ml of calcium salt solution with a concentration of 0.5mol / l in a three-necked flask and put it in a 70°C water bath, add surfactant and stir evenly.

[0024] 2. Under stirring, add a certain amount of sodium sulfate wastewater;

[0025] 3. Keep the temperature and continue to stir for 3 hours, and some products float on the water surface;

[0026] 4. Filter and wash the above product;

[0027] After dehydration and drying at 5.60°C, a calcium sulfate whisker powder with a diameter of 2 μm, a length of 100 μm, and an aspect ratio of 50 was obtained.

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Abstract

The invention relates to a normal-pressure low-temperature liquid phase in situ hydrophobic calcium sulfate crystal whisker preparation method, in which sodium sulfate waste water is adopted as a raw material. The preparation method comprises the steps: a certain amount of calcium salt of 0.5 to 1mol / L is added in a three-necked bottle, a surface active agent is added thereto, and after the mixture is evenly blended, a certain amount of sodium sulfate waste water is added, the temperature is increased to 30 to 70 DEG C, the mixture is blended at a constant temperature to cause the crystallizing reaction for 3 to 7 hours, the obtained white product is dried and treated byheat at the temperature of 60 to 200 DEG C after being filtered and cleaned, the calcium sulfate crystal whisker powder with the diameter of 1 to 2 micron, the length of 30 to 50 micron, and the length-diameter ratio of 15 to 50 is obtained, the filtered fluid is a salt solution as much again as the raw material, sodium chloride is produced based thereon, and the secondary utilization of the waste fluid is realized. The invention has the advantages that the sodium sulfate waste water is simply treated during the preparation process, the process is simplified, the energy resources are saved, the cost is reduced, the recycling and utilization of the renewable resources are realized, and the product is provided with higher economic value and social value.

Description

technical field [0001] The invention relates to a new method for treating sodium sulfate wastewater, in particular to a new method for preparing hydrophobic calcium sulfate whiskers in situ using sodium sulfate wastewater as a raw material in normal-pressure low-temperature liquid phase. Background technique [0002] Whisker is a kind of fibrous single crystal material. Whisker-reinforced plastics appeared as early as the 1960s, but due to the complicated production process and high price at that time, the application was limited. It was not until the 1980s that Japan took the lead in developing cheap potassium titanate whiskers, which were used as reinforcing agents in ceramics and plastics. Since then, the research, development, and application of whiskers have made great progress in other developed countries, and have now expanded to the fields of automobiles, electronic appliances, instrumentation, and machinery manufacturing. The research on inorganic salt whiskers in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/62C30B29/46C01F11/46
Inventor 王子忱郑云辉田玉美赵旭刘艳华周兵郭玉鹏
Owner JILIN UNIV
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