Method for increasing extraction rate of mid-low-grade phosphate rock

A low-grade, extraction-rate technology, applied in chemical instruments and methods, phosphorus compounds, phosphate material treatment, etc., can solve problems such as waste of resources, achieve the effects of saving resources, preventing flocculation, and solving difficult utilization

Inactive Publication Date: 2016-08-17
云南天宁矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in my country's traditional dihydrate method to produce phosphoric acid, it is necessary to use P 2 o 5 ≥30% high-grade ore, the extraction rate can reach more than 99%, P 2 o 5 ≤30% low- and medium-grade phosphate rocks contain more impurities. If they are directly extracted, the extraction rate is generally lower than 96%, resulting in a waste of resources. The low- and medium-grade phosphate rocks need to be purified by flotation before they can be used.
At present, there is no method to improve the extraction rate by directly extracting low- and medium-grade phosphate rocks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put the low-grade phosphate rock with a content of 25.4% into the crusher for coarse crushing first, and the coarsely crushed phosphate rock will directly enter the ball mill. At the same time, add water and dispersant to the ball mill to grind the phosphate rock into pulp. Pour it into the extraction tank and extract it with sulfuric acid to obtain phosphoric acid.

[0021] The mass ratio of phosphate rock, water, hydrolyzed polymaleic anhydride, sodium polyacrylate, 5040 dispersant and sulfuric acid is: 40:17:0.6:0.4:0.3:41.7.

[0022] The extraction rate of phosphate rock was detected to be 98.2%.

Embodiment 2

[0024] Put the low-grade phosphate rock with a content of 25.4% into the crusher for coarse crushing first, and the coarsely crushed phosphate rock will directly enter the ball mill. At the same time, add water and dispersant to the ball mill to grind the phosphate rock into pulp. Pour it into the extraction tank and extract it with sulfuric acid to obtain phosphoric acid.

[0025] The mass ratio of phosphate rock, water, hydrolyzed polymaleic anhydride, sodium polyacrylate, 5040 dispersant and sulfuric acid is: 40:17:0.6:0.4:42.

[0026] The extraction rate of phosphate rock was detected to be 98.6%.

Embodiment 3

[0028] Put the low-grade phosphate rock with a content of 25.4% into the crusher for coarse crushing first, and the coarsely crushed phosphate rock will directly enter the ball mill. At the same time, add water and dispersant to the ball mill to grind the phosphate rock into pulp. Pour it into the extraction tank and extract it with sulfuric acid to obtain phosphoric acid.

[0029] The mass ratio of phosphate rock, water, hydrolyzed polymaleic anhydride, sodium polyacrylate and sulfuric acid is: 40:17:0.4:0.6:42.

[0030] The extraction rate of phosphate rock was detected to be 97.8%.

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Abstract

The invention relates to a method for increasing the extraction rate of mid-low-grade phosphate rock. The method comprises the steps that the mid-low-grade phosphate rock is added into a crusher to be roughly crushed, water and a dispersing agent are added into a ball grinding mill while the roughly-crushed mid-low-grade phosphate rock enters the ball grinding mill, the mid-low-grade phosphate rock is ball-ground into rock slurry, the rock slurry is added into an extraction tank to be extracted, phosphoric acid is prepared, and then the extraction rate of the phosphate rock is detected. According to the method, by adding the dispersing agent, flocculation between the ball-ground rock slurry and the rock slurry and flocculation between the rock slurry and an extraction by-product phosphogypsum in the extraction process can be prevented, the contacting specific surface area of the phosphate rock and dilute sulphuric acid is increased, therefore, the extraction rate of the phosphate rock is effectively increased, and the extraction time is saved.

Description

technical field [0001] The invention relates to a method for improving the extraction rate of medium and low-grade phosphate rock. Background technique [0002] my country's phosphate rock reserves are large, ranking second in the world. It is characterized by less rich ore and more low-grade ore. However, in recent years, due to the increase in the output of high-concentration compound fertilizers, the phosphate rock with a content of more than 30% has become increasingly tense. However, in my country's traditional dihydrate method to produce phosphoric acid, it is necessary to use P 2 o 5 ≥30% high-grade ore, the extraction rate can reach more than 99%, P 2 o 5 ≤30% of low- and medium-grade phosphate rocks contain more impurities. If they are directly extracted, the extraction rate is generally lower than 96%, resulting in waste of resources. Low- and medium-grade phosphate rocks need to be purified by flotation before they can be used. At present, there is no method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01B25/222
CPCC01B25/01C01B25/222
Inventor 纪新强
Owner 云南天宁矿业有限公司
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