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Method for preparing gypsum whiskers by seed crystal method

A gypsum whisker and seed method technology, which is applied in the field of waste resource utilization, can solve the problems of low utilization rate of phosphorus tailings, low added value of products, etc., so as to reduce the preparation cost, facilitate the operation, and improve the added value. Effect

Inactive Publication Date: 2020-05-05
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention aims to propose a method for preparing gypsum whiskers by seed crystal method to solve the problems of low resource utilization rate of existing phosphorus tailings and low added value of products

Method used

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  • Method for preparing gypsum whiskers by seed crystal method
  • Method for preparing gypsum whiskers by seed crystal method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] combine figure 1 Shown, the method for preparing gypsum whiskers by the seed crystal method of the present embodiment specifically comprises the following steps:

[0030] 1) Measure 497mL of industrial hydrochloric acid with a mass fraction of 30% (10.30mol / L) in a clean three-necked bottle, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings to the above-mentioned three-necked bottle In the bottle, after adding the high-magnesium phosphorus tailings, turn on the condensed water, start stirring, and reflux at 60°C for 30 minutes to carry out acidolysis reaction. The silicon slag was mixed three times, and the acidolysis filtrate obtained by the primary washing liquid and the insulation filtration were mixed to obtain the acidolysis solution A and the silicon slag, and the calcium ion concentration in the acidolysis solution A was measured;

[0031] 2) Take 150ml of the acid solution A of step 2) and heat it to...

Embodiment 2

[0034] combine figure 1 Shown, the method for preparing gypsum whiskers by the seed crystal method of the present embodiment specifically comprises the following steps:

[0035] 1) Measure 502mL of industrial hydrochloric acid with a mass fraction of 31% (10.35mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings to the above-mentioned three-necked flask In the bottle, after adding the high-magnesium phosphorus tailings, turn on the condensed water, start stirring, and reflux at 55°C for 35 minutes to carry out acidolysis reaction. the silicon slag three times, and mix the acidolysis filtrate obtained by primary washing liquid and insulation filtration to obtain acidolysis solution A and silicon slag, and measure the calcium ion concentration in the acidolysis solution A;

[0036] 2) Take 190ml of the acid solution A of step 2) and heat it to 95°C in an oil bath, measure 160mL of 9...

Embodiment 3

[0039] combine figure 1 Shown, the method for preparing gypsum whiskers by the seed crystal method of the present embodiment specifically comprises the following steps:

[0040] 1) Measure 510mL of industrial hydrochloric acid with a mass fraction of 29% (10.15mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings to the above-mentioned three-necked flask In the bottle, after the addition of high-magnesium phosphorus tailings, turn on the condensed water, start stirring, and reflux at 55°C for 20 minutes to carry out acidolysis reaction. the silicon slag three times, and mix the acidolysis filtrate obtained by primary washing liquid and insulation filtration to obtain acidolysis solution A and silicon slag, and measure the calcium ion concentration in the acidolysis solution A;

[0041] 2) Take 210ml of the acid solution A of step 2) and heat it to 75°C in an oil bath, measure 130mL...

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Abstract

The invention provides a method for preparing gypsum whiskers by a seed crystal method, which comprises the following steps: carrying out mixed reaction on tailing acidolysis liquid and concentrated sulfuric acid under normal pressure conditions by a normal pressure acidification method to prepare gypsum whisker seed crystals, and reacting the gypsum whisker seed crystals with the acidolysis liquid under certain conditions to obtain the gypsum whiskers. The gypsum whiskers obtained by the invention are uniformly distributed, and the length-diameter ratio is about 60; the method is simple in process and convenient to operate, theoretical support is provided for comprehensive utilization and further industrialization of the phosphate tailings, the additional value of phosphate tailing products is greatly increased, environmental pollution caused by the phosphate tailings is avoided, the ecological environment is improved, and the method has huge economic, social and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of waste resource utilization, in particular to a method for preparing gypsum whiskers by a seed crystal method. Background technique [0002] High-magnesium phosphorus tailings are essentially a kind of industrial waste, which mainly comes from the tailings slag left after ore beneficiation and extraction of concentrate, which belongs to mining solid waste in industrial solid waste according to subdivision. At present, the treatment and utilization status of high-magnesium phosphorus tailings is severe. Phosphorus tailings that have not been effectively treated for a long time have piled up like mountains, causing serious pollution to the environment and a waste of resources. Therefore, the treatment of phosphorus tailings is currently the Phosphorus chemical research is facing an important topic. [0003] Calcium Sulfate Whisker (Calcium Sulfate Whisker, CSW), that is, gypsum whisker is a resource product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/46C30B29/62
CPCC30B7/14C30B29/46C30B29/62
Inventor 张华丽潘益杨成潘志权
Owner WUHAN INSTITUTE OF TECHNOLOGY