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Comprehensive utilization method of middle-low grade phosphorite

A low-grade, phosphate rock technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of unrecycled sulfur materials, unrecyclable land, and environmental pollution, so as to increase the added value of products, Effects of avoiding massive emissions and reducing costs

Active Publication Date: 2017-01-04
铜仁市万山区盛和矿业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tailings discharged from the treatment process occupy a large amount of land during the stockpiling process, especially in the process of producing phosphogypsum. The stockpiling of phosphogypsum is large, which will cause a large area of ​​land to be unable to be recycled; and in Sulfur-containing substances are used in the treatment process, that is, sulfuric acid treatment; while the preparation of sulfuric acid consumes a large amount of sulfur and other substances, and the sulfur substances in the treatment process are not recycled, but are directly discharged as products with low added value , which not only caused environmental pollution, but also resulted in a large cost in the process of processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for comprehensive utilization of low- and medium-grade phosphate rocks. After the low- and medium-grade phosphate rocks are ground into powder, 650 g of low- and medium-grade phosphate rocks are measured and added to 1100 g of nitric acid with a concentration of 60%. The stirrer is stirred at a stirring speed of 200r / min, and with the increase of the amount of low- and medium-grade phosphate rock powder added, the speed of the stirrer is gradually increased to 400r / min, and the time for adding low- and medium-grade phosphate rock is controlled. The addition was completed in 90 minutes, and the temperature during the entire reaction process was controlled to be 40°C. After the addition of medium and low-grade phosphate rock powder was completed, the reaction time was kept at a constant temperature for 20 minutes; and filter residue; the filter residue is washed twice with washing water to obtain lotion and acidolysis residue; the lotion is returned to the acidoly...

Embodiment 2

[0027]A method for comprehensive utilization of medium and low-grade phosphate rocks. After grinding the medium and low-grade phosphate rocks into powder, measure and add 850g of medium and low-grade phosphate rocks to 1150g of nitric acid with a concentration of 70%, and during the addition process, use The stirrer is stirred at a stirring speed of 3000r / min, and with the increase of the amount of low-grade phosphate rock powder added, the speed of the stirrer is gradually increased to 600r / min, and the time for adding low-grade phosphate rock is controlled. The addition was completed in 130 minutes, and the temperature during the entire reaction process was controlled to be 80°C. After the addition of medium and low-grade phosphate rock powder was completed, the reaction time was kept at a constant temperature for 140 minutes; and filter residue; the filter residue is washed 3 times with washing water to obtain lotion and acidolysis residue; the lotion is returned to the acid...

Embodiment 3

[0034] A method for comprehensive utilization of middle and low-grade phosphate rocks. After grinding the middle and low-grade phosphate rocks into powder, measure and add 750g of middle and low-grade phosphate rocks to 1130g of nitric acid with a concentration of 65%, and during the adding process, use The stirrer is stirred at a stirring speed of 1000r / min, and with the increase of the amount of low-grade phosphate rock powder added, the speed of the stirrer is gradually increased to 500r / min, and the time for adding low-grade phosphate rock is controlled. The addition is completed in 100 minutes, and the temperature in the whole reaction process is controlled to be 70°C. After the addition of medium and low-grade phosphate rock powder is completed, the reaction time is maintained at a constant temperature for 100 minutes; then the material is placed in a filter press for pressure filtration to obtain the filtrate and filter residue; the filter residue is washed 5 times with ...

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PUM

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Abstract

The invention relates to the technical field of comprehensive utilization of phosphorite, in particular to a comprehensive utilization method of middle-low grade phosphorite. The method comprises the following steps: treating by adopting nitric acid, filtering, washing filter residues, removing calcium, adjusting the pH, concentrating and drying; the leaching efficiency of phosphorus element in the phosphorite is increased, acid in the residues is washed, and by virtue of calcium removal treatment, the removed calcium is converted by adopting an ammonium sulfate solution to obtain calcium carbonate, so that the slag discharging amount is reduced, the waste of sulfur element is avoided, and the phosphorite treatment cost is decreased; and by virtue of the subsequent neutralization of the calcium removing solution, the phosphorus is precipitated in a form of magnesium ammonium phosphate, nitrate radicals and phosphate radicals are separated, and the added value of products is increased.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of middle and low grade phosphate rocks, in particular to a method for comprehensive utilization of middle and low grade phosphate rocks. Background technique [0002] In my country, the storage of phosphate rock is relatively large, but the quality and quality of phosphate rock are relatively low. According to relevant statistics, the basic reserves of phosphate rock available for processing and utilization are relatively low, only 4.054 billion tons, which is low There are many ore grades, among which P 2 o 5 The rich ore with a mass fraction greater than 30% is only 1.108 billion tons, and the P 2 o 5 The average quality score is around 17%. [0003] Therefore, for the application of phosphate rock in my country, most phosphate rocks need to be enriched to meet the production requirements of phosphoric acid and high-concentration phosphate fertilizers, that is, after the ph...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01B25/45
Inventor 袁再六
Owner 铜仁市万山区盛和矿业有限责任公司
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