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A method for preparing calcium sulfate whiskers using multi-physics coupling-assisted gypsum

A calcium sulfate whisker, multi-physics technology, applied in the growth of polycrystalline materials, chemical instruments and methods, single crystal growth, etc. , crystal formation and growth are difficult to control and other problems, to achieve the effect of controllable aspect ratio, reduced preparation cost, and complete shape gauge

Active Publication Date: 2022-07-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of existing preparation methods, the application of calcium sulfate whiskers is limited.
[0004] Although a lot of work has been done in multiple directions in the research on the preparation of calcium sulfate whiskers by using gypsum at present, the overall performance is difficult to control crystal formation and growth, unable to achieve precise crystal regulation, whisker instability, high cost, and low yield. Low
This not only makes the process of using gypsum to prepare calcium sulfate whiskers in large quantities energy-consuming and costly, but also is not conducive to the resource utilization and treatment of gypsum solid waste.

Method used

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  • A method for preparing calcium sulfate whiskers using multi-physics coupling-assisted gypsum
  • A method for preparing calcium sulfate whiskers using multi-physics coupling-assisted gypsum
  • A method for preparing calcium sulfate whiskers using multi-physics coupling-assisted gypsum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the method for preparing calcium sulfate whiskers using multi-physics coupling auxiliary gypsum is as follows:

[0021] (1) According to the ratio of liquid-solid ratio mL:g to 5:1, mix natural gypsum and dilute sulfuric acid with a mass concentration of 2%. After ultrasonic mixing, apply an electric field to the mixture for 20 minutes in the presence of electrodes. The cathode electrode is Stainless steel electrode, the anode electrode is graphite electrode, the electric field voltage is 30V; then the mixture is treated for 30min under the action of electric field and magnetic field, the electric field voltage is 110V, the magnetic field strength is 0.04mT (generated by Helmholtz coil, the number of turns is 50), Take out the electrode, clean the electrode, and complete the impurity removal and purification of the gypsum raw material;

[0022] (2) Adjust the pH to 1 with dilute sulfuric acid with a mass concentration of 1% under the action of ultrasonic i...

Embodiment 2

[0026] Embodiment 2: the method for preparing calcium sulfate whiskers using multi-physics coupling auxiliary gypsum is as follows:

[0027] (1) Mix desulfurization gypsum and dilute sulfuric acid with a mass concentration of 5% according to the ratio of liquid-solid ratio mL:g to 10:1. After ultrasonic mixing, apply an electric field to the mixture for 30 minutes in the presence of electrodes. The cathode electrode is Stainless steel electrode, the anode electrode is graphite electrode, the electric field voltage is 110V; then the mixture is treated for 30min under the action of electric field and magnetic field, the electric field voltage is 220V, and the magnetic field strength is 0.4mT (generated by Helmholtz coil, the number of turns is 500), Take out the electrode, clean the electrode, and complete the impurity removal and purification of the gypsum raw material;

[0028] (2) Adjust the pH to 2 with dilute sulfuric acid with a mass concentration of 2% under the action of...

Embodiment 3

[0032] Embodiment 3: the method for preparing calcium sulfate whiskers using multi-physics coupling auxiliary gypsum is as follows:

[0033] (1) According to the ratio of liquid-solid ratio mL:g to 20:1, mix phosphogypsum and dilute sulfuric acid with a mass concentration of 8%. After ultrasonic mixing, apply an electric field to the mixture for 25 minutes in the presence of electrodes. The cathode electrode is Stainless steel electrode, the anode electrode is graphite electrode, the electric field voltage is 220V; then the mixture is treated for 30min under the action of electric field and magnetic field, the electric field voltage is 360V, and the magnetic field strength is 0.06mT (generated by Helmholtz coil, the number of turns is 1000), Take out the electrode, clean the electrode, and complete the impurity removal and purification of the gypsum raw material;

[0034] (2) Adjust the pH to 1.5 with dilute sulfuric acid with a mass concentration of 4% under the action of ult...

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Abstract

The invention discloses a method for preparing calcium sulfate crystal whiskers by using multi-physical field coupling to assist gypsum, which is characterized in that: under normal temperature, the gypsum raw material is purified by electromagnetic strengthening impurity removal, and under the action of ultrasound, a gypsum raw material with a mass concentration of 1% to 5% is used. After adjusting the pH to 1~2 with dilute sulfuric acid, add a crystallizer, mix evenly under the action of ultrasound, and then apply a multi-physics field to convert different gypsum crystal types into α-gypsum crystals and stimulate the For the growth of calcium sulfate whiskers, finally stand for 8-12 hours until the whiskers are precipitated, and then take out and dry to obtain calcium sulfate whiskers. The whiskers grow fast, the whiskers grow neatly, the particle size is uniform, the length and aspect ratio are controllable, and the production cost is low, the pollution is small, the energy consumption is low, and the yield is high. drastically reduced.

Description

technical field [0001] The invention belongs to the technical field of crystal material preparation, and in particular relates to a method for preparing calcium sulfate whiskers by using multi-physical field coupling to assist gypsum. Background technique [0002] The development and utilization of waste gypsum is not only an important measure for the comprehensive treatment of industrial solid waste and the control of solid waste pollution, but also the only way to alleviate the resource and energy crisis in my country and the world, and reduce the random stacking and pollution of industrial solid waste. Resource reserves are limited, synthetic polymer materials and other organic chemical products that mainly rely on oil and natural gas as raw materials will face the dilemma of gradually depleting raw material sources, while a large number of gypsum solid wastes with great potential for resource utilization have not been well utilized. For gypsum, at present, the storage cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B29/62C30B30/02C30B30/04C30B30/06C30B30/00
CPCC30B29/46C30B29/62C30B30/02C30B30/04C30B30/06C30B30/00
Inventor 瞿广飞吴丰辉赵晨阳曾映达胡英辉李军燕陈帮金
Owner KUNMING UNIV OF SCI & TECH