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Method for preparing nanometer calcium sulfate and calcium sulfate whisker in alcohol-water mixed system

A technology of calcium sulfate whiskers and nano-calcium sulfate, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem that calcium carbide slag and calcium chloride by-product resources are not well used, and there is no research and development to prepare nanometers. Calcium sulfate and its whiskers, etc., achieve the effects of large controllable conditions, easy operation, and cheap and easy-to-obtain raw materials

Active Publication Date: 2017-05-31
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 3. By-product resources such as carbide slag and calcium chloride of tens of millions of tons per year in my country have not been well utilized
[0013] At present, no one has developed a method for preparing nano-calcium sulfate and its whiskers in an alcohol-water mixed system

Method used

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  • Method for preparing nanometer calcium sulfate and calcium sulfate whisker in alcohol-water mixed system
  • Method for preparing nanometer calcium sulfate and calcium sulfate whisker in alcohol-water mixed system
  • Method for preparing nanometer calcium sulfate and calcium sulfate whisker in alcohol-water mixed system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: Preparation of calcium sulfate whiskers with calcium chloride and sodium sulfate as raw materials, ethanol and calcium solution volume ratio of 0:1, and different aging time conditions

[0052] Use a 50mL graduated cylinder to measure 10mL of 1mol / L CaCl 2 The solution was stirred with a magnet for 5 min at a stirring speed of 600 r / min. After stirring, add 10mL of 1mol / L sodium sulfate solution to the solution, stir and age the resulting slurry for 0h, 1h, 3h, and 5h respectively, then carry out suction filtration, and dry the obtained calcium sulfate in an oven at 100°C for 24h get the product.

[0053] The SEM image of the obtained sample is shown in figure 2 The results show that the initial morphology of the calcium sulfate generated is not uniform, and as the aging time increases, the calcium sulfate does not appear as a whisker-shaped product, and the calcium sulfate morphology is still fine and fibrous.

Embodiment 2

[0054] Example 2: Calcium sulfate whiskers were prepared by using calcium chloride and sodium sulfate as raw materials, the volume ratio of ethanol to calcium solution was 1:2, and different aging times.

[0055] Use a 50mL graduated cylinder to measure 5mL of absolute ethanol in a three-necked flask, and then add 10mL of 1mol / L CaCl to the flask 2 The solution was stirred with a magnet for 5 min at a stirring speed of 600 r / min. After stirring, add 10mL of 1mol / L sodium sulfate solution to the solution, stir and age the resulting slurry for 0h, 1h, 3h, and 5h respectively, then carry out suction filtration, and dry the obtained calcium sulfate in an oven at 100°C for 24h get the product.

[0056] The product obtained after the reaction was characterized by X-ray diffractometer (XRD). The obtained sample X-ray diffraction (XRD) is as follows figure 1 As shown in a, the obtained calcium sulfate crystal form is CaSO 4 0.5H 2 O. The SEM image of the obtained sample is shown...

Embodiment 3

[0057] Embodiment 3: take calcium chloride and sodium sulfate as raw material preparation, ethanol and calcium solution volume ratio are 1: 1, prepare calcium sulfate whisker under different aging time conditions.

[0058] Use a 50mL graduated cylinder to measure 10mL of absolute ethanol in a three-necked flask, and then add 10mL of 1mol / L CaCl to the flask 2 The solution was stirred with a magnet for 5 min at a stirring speed of 600 r / min. After stirring, add 10mL of 1mol / L sodium sulfate solution to the solution, stir and age the resulting slurry for 0h, 1h, 3h, and 5h respectively, then carry out suction filtration, and dry the obtained calcium sulfate in an oven at 100°C for 24h get the product.

[0059] The product obtained after the reaction was characterized by X-ray diffractometer (XRD). The obtained sample X-ray diffraction (XRD) is as follows figure 1 As shown in b, the obtained calcium sulfate crystal form is CaSO 4 0.5H 2 O. The SEM image of the obtained samp...

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Abstract

The invention relates to a method for preparing nanometer calcium sulfate and calcium sulfate whisker in an alcohol-water mixed system. The method comprises the following steps of adding a certain ratio of alcohol into a soluble amino acid calcium salt water solution or a soluble calcium salt water solution, and uniformly mixing and stirring; directly adding a diluted sulfuric acid or sulfate solution into mixed liquid; after reaction reaches an end point, quickly filtering or aging for a period of time, and performing post-treatment, so as to obtain the nanometer calcium sulfate or the calcium sulfate whisker. The method has the advantages that the technology is simple, the condition controllable range is wide, raw materials are low-cost and easy to obtain, the operation is simple and convenient, and the like; the method is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of raw material production. Specifically, the present invention relates to a large-scale, simple and economical method for producing high-quality nano calcium sulfate and calcium sulfate whiskers in an alcohol-water system. Background technique [0002] Nano-calcium sulfate is a cheap nano-powder material. It not only retains the excellent properties of bulk calcium sulfate, such as non-toxicity, light weight, good gelling properties, sound insulation, heat insulation, and good flame retardancy, but also has Nano-sized material characteristics, it has the advantages of high temperature resistance, chemical corrosion resistance, good toughness, high strength, etc., and is an important functional filler and matrix material. Therefore, it can be widely used in many fields such as medicine, chemical industry, papermaking, petroleum, environmental protection and so on. [0003] At present, the methods for prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y30/00C30B7/14C30B29/46C30B29/62
CPCC01F11/46C01F11/466C01P2002/72C01P2004/03C01P2004/62C01P2004/64C30B7/14C30B29/46C30B29/62
Inventor 尹应武孔祥波姚思强孙瑞魏嘉成任毅华吐松叶李艺张海双
Owner XIAMEN UNIV
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