Method for preparing monocalcium chlorophosphate and magnesium hydroxide from high-magnesium-content phosphate tailings

A technology of high magnesium phosphorus tailings and calcium chlorophosphate is applied in the field of waste resource utilization, which can solve the problems of low added value of products and low utilization rate of phosphorus tailings, so as to reduce the cost of resource utilization and improve resources. The effect of simplifying the utilization rate and resource utilization process

Inactive Publication Date: 2019-11-15
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for preparing calcium chlorophosphate and magnesium hydroxide by using high-magnesium phosphorus tailings, so as 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 monocalcium chlorophosphate and magnesium hydroxide from high-magnesium-content phosphate tailings

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Effect test

Embodiment 1

[0027] combine figure 1 As shown, the method for preparing calcium chlorophosphate and magnesium hydroxide by utilizing high-magnesium phosphorus tailings of the present embodiment specifically comprises the following steps:

[0028] 1) Measure 490mL of industrial hydrochloric acid with a mass fraction of 33.3% (10.41mol / 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 three-necked flask In the flask, after adding the high-magnesium phosphorus tailings, open the condensed water, start stirring, reflux at 50°C for 30 minutes, and carry out the acidolysis reaction. Silicon slag, wherein, the silicon slag is washed three times with 100mL distilled water, and the first washing solution is mixed with the acid solution A;

[0029] 2) Pour the acid solution A into a dry beaker, place it in an ice bath at -6°C, and let it stand for 14 hours to completely precipitate the white calci...

Embodiment 2

[0033] combine figure 1 As shown, the method for preparing calcium chlorophosphate and magnesium hydroxide by utilizing high-magnesium phosphorus tailings of the present embodiment specifically comprises the following steps:

[0034] 1) Measure 500mL of industrial hydrochloric acid with a mass fraction of 32.8% (10.37mol / 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 three-necked flask In the flask, after the addition of high-magnesium phosphorus tailings is completed, open the condensed water, start stirring, and reflux at 30°C for 40 minutes to carry out acidolysis reaction. Silicon slag, wherein, the silicon slag is washed three times with 100mL distilled water, and the first washing solution is mixed with the acid solution A;

[0035] 2) Pour the acid solution A into a dry beaker, place it in an ice bath at -9°C, and let it stand for 10 hours to completely precipitate...

Embodiment 3

[0039] combine figure 1 As shown, the method for preparing calcium chlorophosphate and magnesium hydroxide by utilizing high-magnesium phosphorus tailings of the present embodiment specifically comprises the following steps:

[0040] 1) Measure 520mL of industrial hydrochloric acid with a mass fraction of 34% (10.06mol / 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 three-necked flask In the flask, after the addition of high-magnesium phosphorus tailings is completed, open the condensed water, start stirring, and reflux at 45°C for 20 minutes to carry out acidolysis reaction. Silicon slag, wherein, the silicon slag is washed three times with 100mL distilled water, and the first washing solution is mixed with the acid solution A;

[0041] 2) Pour the acid solution A into a dry beaker, place it in an ice bath at -5°C, and let it stand for 18 hours to completely precipitate t...

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Abstract

The invention provides a method for preparing monocalcium chlorophosphate and magnesium hydroxide from high-magnesium-content phosphate tailings. The method comprises the steps that through acidolysisof hydrochloric acid, silica slag in the high-magnesium-content phosphate tailings is separated out; after low-temperature still standing, phosphorus in the high-magnesium-content phosphate tailingsis separated out in a monocalcium chlorophosphate form; afterwards, through acidolysis of sulfuric acid, calcium and magnesium in the high-magnesium-content phosphate tailings are separated out; finally, by introducing ammonia gas into an acidized fluid acidized by the sulfuric acid, the magnesium hydroxide is obtained. The additive value of the product obtained by using the method is high, the whole recycling process of the high-magnesium-content phosphate tailings is simple, the recycling rate of the high-magnesium-content phosphate tailings is easily increased, and therefore, the problem that phosphate tailings are accumulated is easily solved. Environmental pollution caused by the phosphate tailings is further easily solved, the ecological environment is improved, and the method has great 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 calcium chlorophosphate and magnesium hydroxide from high-magnesium phosphorus tailings. Background technique [0002] Phosphorus tailings mainly come from the tailings left after beneficiation and extraction of concentrate, which belongs to mining solid waste in industrial solid waste. Its minerals mainly include dolomite, fluorophosphorite and quartz, and its CaO content is about 30.0-34.0%. 2 o 5 The content is about 4-8.5%, and the MgO content is about 12-18%. [0003] With the increase of phosphate rock mining, the amount of phosphate tailings is also rising rapidly. After every 1 million tons of phosphate rock is selected, 300,000 to 400,000 tons of phosphorus tailings will be produced. At present, the comprehensive utilization rate of phosphorus tailings is only 18%, and most of them are discharged to tailings ponds or dehydrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455C01F5/20C01F11/46
CPCC01B25/455C01F5/20C01F11/46
Inventor 张华丽潘益潘志权吴汉军夏琰张家鑫
Owner WUHAN INSTITUTE OF TECHNOLOGY
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