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Method for preparing calcium sulfate whisker from low-grade natural gypsum or gypsum tailings

A calcium sulfate whisker and natural gypsum technology, applied in the field of calcium sulfate whisker preparation, can solve the problems of insufficient utilization of raw materials, poor quality of calcium sulfate whiskers, high requirements for raw materials, etc., achieve strong promotion and application value, reduce The effect of high production cost and aspect ratio

Active Publication Date: 2015-04-22
青海博川集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a process for preparing calcium sulfate whiskers by using low-grade natural gypsum or gypsum tailings, aiming to solve the problem that the existing process has high requirements on raw materials, raw materials cannot be fully utilized, and the prepared calcium sulfate whiskers are Poor quality, high production cost, serious environmental pollution

Method used

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  • Method for preparing calcium sulfate whisker from low-grade natural gypsum or gypsum tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Crush the gypsum tailings, sieve through a 120-mesh sieve, add 15.00g of crushed gypsum and 300mL of 1.50mol / L hydrochloric acid solution prepared in advance to a 500mL beaker at the same time, and immerse the solution in the above beaker at a constant temperature of 80°C In a water bath, keep the temperature constant and stir for 5 hours. After the reaction is completed, suction filter while it is hot, and remove the solid residue not dissolved in the hydrochloric acid solution. After the crystallization is completed, filter with suction, wash the filter cake with acid, then wash it with water, and then dry the filter cake in an oven at 50°C for 6 hours to obtain 6.89g of high-purity gypsum product. Weigh 6.18g of high-purity gypsum product after purification, add 200mL of deionized water, add crystal growth agent magnesium chloride hexahydrate according to the mass fraction of magnesium chloride 0.04% to make slurry, transfer the slurry into the reactor, and control th...

Embodiment 2

[0037]Crush the low-grade gypsum ore, sieve it through a 120-mesh sieve, add 30.12g of the crushed gypsum and 600mL of 0.5mol / L nitric acid solution prepared in advance to a 1000mL beaker at the same time, and immerse the solution in the above beaker at 50°C In a constant temperature water bath, keep the temperature constant and stir for 10 hours. After the reaction is completed, suction filter while it is hot, and remove the solid residue not dissolved in the nitric acid solution. After the crystallization is completed, filter with suction, wash the filter cake with acid, then wash it with water, and then dry the filter cake in an oven at 40°C for 12 hours to obtain 14.28g of high-purity gypsum product. Weigh 10.53g of the purified high-purity gypsum product, add 200mL of deionized water, add crystal growth agent magnesium chloride according to the mass fraction of the solution at 0.2% to make a slurry, transfer the slurry into the reactor, and control the reaction temperature...

Embodiment 3

[0039] Crush the gypsum tailings, sieve through a 120-mesh sieve, add 60.00 g of the crushed gypsum and 900 mL of a 1.0 mol / L mixed solution of hydrochloric acid and nitric acid to a 1000 mL beaker at the same time, and immerse the solution in the above beaker in In a constant temperature water bath at 60°C, keep the temperature constant and stir for 2 hours. After the reaction is completed, suction filter while it is hot, and remove the solid residues that are not dissolved in the hydrochloric acid and nitric acid solutions. 18h. After the crystallization is complete, filter with suction, wash the filter cake with acid, then wash it with water, and then dry the filter cake in an oven at 60°C for 2 hours to obtain 35.19g of high-purity gypsum product. Weigh 26.16g of the purified high-purity gypsum product, add 200mL of deionized water, add the crystal growth agent magnesium nitrate according to the mass fraction of magnesium nitrate 0.16% to make slurry, transfer the slurry i...

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Abstract

The invention relates to a method for preparing a calcium sulfate whisker from low-grade natural gypsum or gypsum tailings. The method comprises the following steps of: firstly, purifying low-grade natural gypsum or gypsum tailings by crystallizing; pulverizing, screening, adding into an acid with a specific solubility, and heating to a certain temperature to dissolve the acid completely; then carrying out solid-liquid separation while the liquid is hot, removing undissolved solid-phase impurities, cooling and recrystallizing the liquid phase, carrying out solid-liquid separation, washing a filter cake with water, and drying to obtain high-purity gypsum; and then preparing suspension with a certain concentration from the high-purity gypsum, adding a certain amount of whisker growth promoting agent into the suspension, and synthesizing the calcium sulfate whisker at a high length-diameter ratio under the hydrothermal condition. The process provided by the invention is used for producing the chemical product (calcium sulfate whisker) with a high additional value from the abundant low-cost low-grade natural gypsum or tailings thereof, thus the production cost can be reduced effectively. In addition, the production process is clean and environment-friendly, and the process has high popularization and application values.

Description

technical field [0001] The invention relates to the field of preparation of calcium sulfate whiskers, in particular to a method for preparing calcium sulfate whiskers by utilizing low-grade natural gypsum or gypsum tailings. Background technique [0002] As the cost of high-quality natural gypsum mining increases, the cost of calcium sulfate whisker preparation increases. At the same time, high-grade gypsum resources are gradually decreasing. Therefore, the full development and utilization of low-grade gypsum or gypsum tailings resources has been paid more and more attention. However, the low-grade natural gypsum or gypsum tailings have complex impurity components, poor gradation, and low purity, which creates obstacles for the resource utilization of low-grade natural gypsum or gypsum tailings. If the gypsum tailings are not utilized, they will become industrial waste, occupying land, polluting the environment, causing pollution to the environment and society, and also burd...

Claims

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Application Information

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IPC IPC(8): C30B7/10C30B29/46C30B29/62
Inventor 袁绪川王敏王怀有周育华赵强赵有璟
Owner 青海博川集团有限公司
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