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Preparation method of gypsum whiskers

A technology of gypsum whiskers and fine powder, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of mountain vegetation destruction, large resource consumption, high production cost, etc., achieve smooth surface, improve utilization efficiency, Good microscopic effect

Inactive Publication Date: 2019-04-30
YANGTZE NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for preparing gypsum whiskers, which solves the problem of serious damage to mountain vegetation due to the fact that the raw materials used in the preparation process of gypsum whiskers are mainly non-renewable natural minerals. , high resource consumption, environmental pollution and high production costs, and the present invention also provides a new method for resource utilization of hardened gel in waste concrete

Method used

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  • Preparation method of gypsum whiskers
  • Preparation method of gypsum whiskers
  • Preparation method of gypsum whiskers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Select waste concrete from construction waste, crush it with a small hammer crusher and control the particle size of the discharged particles to ≤10mm, then put the crushed particles into a corundum crucible and put them in a box-type resistance furnace at 500°C Carry out pre-burning for 20 minutes, take it out after the furnace temperature is lowered to below 100°C, and after cooling to room temperature, shake the pre-burned particles in an electromagnetic vibrating pulverizer for 3-10 seconds, and pour them into a 125-mesh square hole sieve after shaking and separating. Sieve, and then ball mill the fine particles collected under the sieve, and control the discharge particle size of the ball mill to be less than 45 μm, that is, to obtain hardened gel fine powder.

[0038] 2) Mix the hardened gel fine powder and carbon powder obtained in step 1) according to the mass ratio of 100:10, and then mix it in a high-speed mixer at a speed of 200-500rpm for 20-30min, after t...

Embodiment 2

[0044] 1) Select waste concrete from construction waste, use a small hammer crusher to crush and control the particle size of the discharged particles to ≤10mm, then put the crushed particles into a corundum crucible and put them in a box-type resistance furnace at 550°C Carry out pre-burning for 20 minutes, take it out after the furnace temperature is lowered to below 100°C, and after cooling to room temperature, shake the pre-burned particles in an electromagnetic vibrating pulverizer for 3-10 seconds, and pour them into a 200-mesh square hole sieve after shaking and separating. Sieve, and then ball mill the fine particles collected under the sieve, and control the discharge particle size of the ball mill to be less than 45 μm, that is, to obtain hardened gel fine powder.

[0045] 2) Mix the hardened gel fine powder obtained in step 1) with carbon powder according to the mass ratio of 150:10, and then mix it in a high-speed mixer at a speed of 200-500rpm for 20-30min, after t...

Embodiment 3

[0051] 1) Select waste concrete from construction waste, crush it with a small hammer crusher and control the particle size of the discharged particles to ≤10mm, then put the crushed particles into a corundum crucible and put them in a box-type resistance furnace at 300°C Carry out pre-burning for 20 minutes, take it out after the furnace temperature is lowered to below 100°C, and after cooling to room temperature, shake the pre-burned particles in an electromagnetic vibrating pulverizer for 3-10 seconds, and pour them into a 325-mesh square hole sieve after shaking and separating. Sieve, and then ball mill the fine particles collected under the sieve, and control the discharge particle size of the ball mill to be less than 45 μm, that is, the hardened gel powder fine powder is obtained.

[0052] 2) Mix the hardened gel fine powder and carbon powder obtained in step 1) according to the mass ratio of 200:10, and then mix it in a high-speed mixer at a speed of 200-500rpm for 20-3...

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Abstract

The invention discloses a preparation method of gypsum whiskers; a hardened gelling substance in waste concrete is used as a raw material, and then is granulated and co-fired with carbon powder to form a calcium-rich solution, and after silicon and iron are removed, crystalline calcium ions are provided for preparation of the gypsum whiskers; the prepared gypsum whiskers are fibrous, and have theadvantages of large length-diameter ratio, uniform length, high quality, good performance and mild preparation process conditions. Moreover, because the used raw material is solid waste and natural mineral raw materials does not need to be consumed, the prepared calcium sulfate whiskers have the advantages of environmental friendliness, simplicity, practicability and low cost. The method not onlyimproves the utilization value of the hardened gelling substance in the waste concrete, but also provides a new raw material with wide source, low cost and easy availability for preparation of the calcium sulfate whiskers, and has obvious environmental benefits, social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a preparation method of gypsum whiskers. Background technique [0002] Calcium sulfate whisker, also known as gypsum whisker, is a new type of needle-like material grown in the form of single crystal, with uniform cross-section, complete shape and perfect internal structure. Due to its characteristics of stable size, good toughness, high strength, and high temperature resistance, it is widely used in thermal insulation, building materials, friction, papermaking, catalysis, environmental governance and other industries in the form of reinforcing materials or functional fillers. Application prospect. [0003] At present, natural anhydrite is used as a common raw material at home and abroad to prepare gypsum whiskers by hydrothermal method or atmospheric pressure acidification method. However, on the one hand, since natural anhydrite is a non-renewable resource, its lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B29/62C30B7/14
CPCC30B7/14C30B29/46C30B29/62
Inventor 刘东升权鑫周丽新余友清
Owner YANGTZE NORMAL UNIVERSITY
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