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Method for preparing calcium sulfate whiskers by using multi-physical field coupling assisted gypsum

A calcium sulfate whisker and multi-physics technology, which is applied in the growth of polycrystalline materials, chemical instruments and methods, and single crystal growth, can solve the problem of unfavorable utilization and treatment of gypsum solid waste resources and the inability to achieve precise control of crystals , Difficult to control crystal formation and growth, etc., to achieve the effects of controllable aspect ratio, reduced preparation cost, and complete shape regulation

Active Publication Date: 2021-01-22
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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  • Method for preparing calcium sulfate whiskers by using multi-physical field coupling assisted gypsum
  • Method for preparing calcium sulfate whiskers by using multi-physical field coupling assisted gypsum
  • Method for preparing calcium sulfate whiskers by using multi-physical field 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 field coupling auxiliary gypsum is as follows:

[0021] (1) Mix natural gypsum with dilute sulfuric acid with a mass concentration of 2% according to the liquid-solid ratio mL:g of 5:1. 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 a 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, and 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) Under the action of ultrasound with an ultrasound intensity of 20kHz, adjust the pH to 1 with dilute sulfu...

Embodiment 2

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

[0027] (1) Mix desulfurized gypsum and dilute sulfuric acid with a mass concentration of 5% according to the liquid-solid ratio mL:g of 10:1, and after ultrasonic mixing, apply an electric field to the mixture for 30 minutes in the presence of electrodes, and the cathode electrode is The stainless steel electrode, the anode electrode is a graphite electrode, and the electric field voltage is 110V; then the mixture is treated for 30 minutes 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) Under the action of ultrasound with an ultrasound intensity of 30kHz, adjust...

Embodiment 3

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

[0033] (1) According to the liquid-solid ratio mL:g of 20:1, mix phosphogypsum and dilute sulfuric acid with a mass concentration of 8%, and 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 a graphite electrode, and the electric field voltage is 220V; then the mixture is treated for 30 minutes 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 the 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) Under the action of ultrasound with an ultrasound intensity of 40kHz, adjust the pH to...

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Abstract

The invention discloses a method for preparing calcium sulfate whiskers by using multi-physical field coupling assisted gypsum, which is characterized by comprising the following steps: purifying gypsum raw materials by electromagnetic enhanced impurity removal at normal temperature, regulating the pH value to 1-2 by using dilute sulfuric acid with the mass concentration of 1%-5% under the ultrasonic action, adding a crystal modifier, uniformly mixing under the ultrasonic action, applying a multi-physical field, converting different gypsum crystal types into alpha gypsum crystals under the coupling action of multiple physical fields, stimulating the growth of calcium sulfate whiskers, and finally standing for 8-12 hours until the whiskers are separated out, taking out and drying to obtainthe calcium sulfate whiskers. The length-diameter ratio of the prepared calcium sulfate whisker reaches up to 100-150, the growth speed of the whisker is high, the whisker grows tidily, the particle size is uniform, the length and the length-diameter ratio are controllable, the production cost is low, the pollution is small, the energy consumption is low, the yield is high, the preparation processis simple, high-temperature preparation is not needed, and the preparation cost is greatly 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-physics field coupling auxiliary gypsum. Background technique [0002] The development and utilization of discarded gypsum is not only an important measure for the comprehensive treatment of industrial solid waste and solid waste pollution control, but also the only way to alleviate the resource and energy crisis in my country and the world, and to reduce the random stacking and pollution of industrial solid waste. With limited resource reserves, 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 amount of gypsum solid waste with great potential for resource utilization has not been well utilized. As far as gypsum is concerned, at present...

Claims

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Application Information

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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