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A kind of method for preparing hemihydrate gypsum whiskers

A technology of hemihydrate gypsum and whiskers, applied in the field of inorganic chemical material preparation, can solve the problems of complex operation, high energy consumption and high equipment requirements

Active Publication Date: 2021-09-07
BEIJING NEW BUILDING MATERIALS PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional preparation method of hemihydrate gypsum whiskers is mainly the autoclaved hydrothermal method, which mainly involves adding dihydrate gypsum into a salt solution with a crystal modifier and reacting under high pressure and high temperature. This method requires high equipment and operation Complex and energy-intensive

Method used

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  • A kind of method for preparing hemihydrate gypsum whiskers
  • A kind of method for preparing hemihydrate gypsum whiskers
  • A kind of method for preparing hemihydrate gypsum whiskers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A. Selection of raw materials: Select 2g of desulfurized gypsum as raw material.

[0036] B. Drying of raw materials: Send the selected desulfurized gypsum into a drying oven, adjust the temperature of the drying oven to 40°C, and dry for 4 hours to remove free water in the raw materials.

[0037] C. Grinding of raw materials: Grinding the dried desulfurized gypsum in a mortar to form a fine powder.

[0038] D. Screening of raw materials: Screen the ground desulfurized gypsum through a 230-mesh sieve to remove large particles of impurities.

[0039] E. Hydrothermal reaction of raw materials at normal pressure: Weigh 1 g of the desulfurized gypsum obtained after sieving, add it to 10 ml of 2 mol / L (density about 1.03 g / ml) hydrochloric acid, and react at 93° C. for 6 h.

[0040] F. Suction filtration: rapid suction filtration of the reacted slurry to obtain a white filter cake.

[0041] G. Washing: Wash the filter cake obtained after suction filtration with absolute et...

Embodiment 2

[0044] A. Selection of raw materials: Select 4g of desulfurized gypsum as raw material.

[0045] B. Drying of raw materials: Send the selected desulfurized gypsum into a drying oven, adjust the temperature of the drying oven to 45°C, and dry for 5 hours to remove free water in the raw materials.

[0046] C. Grinding of raw materials: Grinding the dried desulfurized gypsum in a mortar to form a fine powder.

[0047] D. Screening of raw materials: Screen the ground desulfurized gypsum through a 240-mesh sieve to remove large particles of impurities.

[0048] E. Hydrothermal reaction of raw materials under normal pressure: Weigh 3g of desulfurized gypsum obtained after sieving, add it to 26ml of 2mol / L hydrochloric acid, and react at 95°C for 7h.

[0049] F. Suction filtration: rapid suction filtration of the reacted slurry to obtain a white filter cake.

[0050] G. Washing: Wash the filter cake obtained after suction filtration with absolute ethanol at room temperature.

[00...

Embodiment 3

[0053] A. Selection of raw materials: select 10g of desulfurized gypsum as raw material.

[0054] B. Drying of raw materials: Send the selected desulfurized gypsum into a drying oven, adjust the temperature of the drying oven to 50°C, and dry for 6 hours to remove free water in the raw materials.

[0055] C. Grinding of raw materials: Grinding the dried desulfurized gypsum in a mortar to form a fine powder.

[0056] D. Screening of raw materials: Screen the ground desulfurized gypsum through a 240-mesh sieve to remove large particles of impurities.

[0057] E. Normal-pressure hydrothermal reaction of raw materials: Weigh 8 g of desulfurized gypsum obtained after sieving, add it to 80 ml of 2 mol / L hydrochloric acid, and react at 96° C. for 8 h.

[0058] F. Suction filtration: rapid suction filtration of the reacted slurry to obtain a white filter cake.

[0059] G. Washing: Wash the filter cake obtained after suction filtration with absolute ethanol at room temperature.

[0...

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Abstract

A method for preparing hemihydrate gypsum whiskers, the method comprising: selecting desulfurized gypsum as a raw material; drying the selected desulfurized gypsum to remove free water therein; grinding the dried desulfurized gypsum into fine powder shape; sieve the desulfurized gypsum after grinding to remove large particles of impurities; add the sieved desulfurized gypsum to hydrochloric acid of a certain concentration, stir and mix it into a slurry, and mix the slurry at a certain temperature carrying out the reaction; after the atmospheric pressure hydrothermal reaction is completed, the slurry is subjected to suction filtration; the filter cake obtained after the suction filtration is washed with an organic solvent; and the washed filter cake is dried to obtain hemihydrate gypsum whiskers. The hemihydrate gypsum whiskers prepared by the method of the present application have an aspect ratio of up to 300, a uniform diameter, and no lattice defects such as dislocations and stacking.

Description

technical field [0001] This application relates to but not limited to the field of preparation of inorganic chemical materials, in particular to but not limited to a method for preparing hemihydrate gypsum whiskers. Background technique [0002] Gypsum hemihydrate whisker is a fibrous single crystal of calcium sulfate hemihydrate, which has extremely high tensile strength, elastic modulus, high dielectric strength, wear resistance, high temperature resistance, corrosion resistance, good infrared reflectivity, and is easy to surface It is an inorganic material with low price and high comprehensive performance. It can be used as a reinforcing component in resin, rubber and paint, and has a very broad development prospect. [0003] The traditional preparation method of hemihydrate gypsum whiskers is mainly the autoclaved hydrothermal method, which mainly involves adding dihydrate gypsum into a salt solution with a crystal modifier and reacting under high pressure and high tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B29/62C30B7/00
CPCC30B7/00C30B29/46C30B29/62
Inventor 张晓菲陈红霞王霞李帆冉秀云
Owner BEIJING NEW BUILDING MATERIALS PLC
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