Comprehensive utilization method for cyclic acid leaching of high-magnesium phosphorus tailings

A technology of high-magnesium phosphorus tailings and circulating acid, applied in the field of waste resource utilization, can solve the problems of low resource utilization rate of phosphorus tailings and low added value of products

Inactive Publication Date: 2019-11-15
WUHAN INSTITUTE OF TECHNOLOGY
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  • 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 comprehensive utilization method of cyclic acid leaching high-magnesium p

Method used

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  • Comprehensive utilization method for cyclic acid leaching of high-magnesium phosphorus tailings

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Effect test

Embodiment 1

[0031] combine figure 1 As shown, the comprehensive utilization method of the cyclic acid leaching high magnesium phosphorus tailings of the present embodiment specifically comprises the following steps:

[0032] 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;

[0033] 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 calcium chloride phosphate...

Embodiment 2

[0040] combine figure 1 As shown, the comprehensive utilization method of the cyclic acid leaching high magnesium phosphorus tailings of the present embodiment specifically comprises the following steps:

[0041] 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;

[0042] 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 the white calcium ch...

Embodiment 3

[0049] combine figure 1 As shown, the comprehensive utilization method of the cyclic acid leaching high magnesium phosphorus tailings of the present embodiment specifically comprises the following steps:

[0050] 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;

[0051] 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 the white calcium chlo...

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Abstract

The invention provides a comprehensive utilization method for cyclic acid leaching of high-magnesium phosphorus tailings. The method comprises the steps that firstly, silicon slags in the high-magnesium phosphorus tailings are separated out through hydrochloric acid hydrolysis; secondly, phosphorus in the high-magnesium phosphorus tailings is precipitated in a form of calcium chlorophosphate through low-temperature standing; thirdly, calcium and magnesium in the high-magnesium phosphorus tailings are separated out through sulfuric acid acidification, and calcium sulfate whiskers are obtained through concentration treatment; finally, magnesium hydroxide is obtained by introducing ammonia gas, and hydrochloric acid is added to a final concentrate to conduct cyclic acid leaching on the high-magnesium phosphorus tailings. On one hand, the added value of the obtained product can be increased; on the other end, the great increase of the resource utilization rate of the high-magnesium phosphorus tailings is facilitated; thus, the method is beneficial to solving the accumulation problem of the phosphorus tailings and the environmental pollution caused by the phosphorus tailings, improves the ecological environment and 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 comprehensive utilization of cyclic acid leaching 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 dehydrated and stored...

Claims

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Application Information

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IPC IPC(8): C01B25/455C01F11/46C01F5/20
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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