Method of treating positive flotation phosphate concentrate with HNO3

A positive flotation and pretreatment technology, applied in the direction of flotation, magnesium nitrate, phosphorus oxides, etc., can solve the problems that fertilizer water-soluble phosphorus and nitrogen are difficult to reach the standard, so as to improve the grinding capacity, strong applicability, reduce grinding The effect of ore fineness

Inactive Publication Date: 2019-05-03
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent is for enrichment of phosphorus, which makes it difficult for the wate

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix and grind medium and low-grade phosphate rock with regulator, the grinding fineness is -0.038mm67.88%; water glass is used as the inhibitor, the dosage is 1.3%; the regulator is sodium carbonate, the dosage is 3.6%, once coarse The selected concentrate is positive flotation concentrate. Take 100g of positive flotation phosphorus concentrate, add 11.25g of 6% dilute nitric acid, the leaching temperature is 30°C, the time is 230min, and the filtrate is obtained by suction filtration and neutralized in two stages with ammonia water, wherein the pH value of the first stage of neutralization is 4.2; The pH value of the second-stage neutralization is 8.6, and the drying is respectively magnesium ammonium nitrate and calcium ammonium nitrate. The main chemical composition of the obtained phosphorous concentrate is P 2 o 5 32.78%; MgO 0.39%; P 2 o 5 The comprehensive recovery rate is 80.35%.

Embodiment 2

[0034] Mix and grind the medium and low-grade phosphate rock with the regulator, the grinding fineness is -0.038mm and less than 70%; use water glass as the inhibitor, the dosage is 1.4%; the regulator is sodium carbonate, the dosage is 3.5%; once The rougher concentrate is the positive flotation concentrate. Take 100g of positive flotation phosphorus concentrate, add 7.48g of 9% dilute nitric acid, the leaching temperature is 29°C, the time is 360min, the filtrate is obtained by suction filtration and neutralized in two stages with ammonia water, and the pH value of the first stage of neutralization is 4.5; The pH value of the second-stage neutralization is 8.3, and the drying is respectively magnesium ammonium nitrate and calcium ammonium nitrate. The main chemical composition of the obtained phosphorous concentrate is P 2 o 5 31.87%; MgO 0.47%; P 2 o 5 The comprehensive recovery rate is 80.76%.

Embodiment 3

[0039] Mix and grind the medium and low-grade phosphate rock with the adjusting agent, the grinding fineness is -0.038mm and less than 70%; use water glass as the inhibitor, the dosage is 1.6%; the adjusting agent is sodium bicarbonate, the dosage is 3.2%; The concentrate of primary roughing is positive flotation concentrate. Take 100g of positive flotation phosphorus concentrate, add 4.87g of 12% dilute nitric acid, the leaching temperature is 40°C, the time is 350min, the filtrate is obtained by suction filtration and neutralized in two stages with ammonia water, and the pH value of the first stage of neutralization is 4.6; The pH value of the second-stage neutralization is 9.2, and the drying is respectively magnesium ammonium nitrate and calcium ammonium nitrate. The main chemical composition of the obtained phosphorous concentrate is P 2 o 5 32.14%; MgO 0.40%; P 2 o 5 The comprehensive recovery rate is 81.10%.

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Abstract

The invention discloses a method of treating positive flotation phosphate concentrate with HNO3 and belongs to the field of phosphorus chemical industry and phosphorus ore beneficiation. The method includes: firstly performing positive flotation on medium/low-grade phosphorus ore and then performing pretreatment with low-concentration nitric acid to treat calcium and magnesium in the positive flotation phosphate concentrate; performing two-stage neutralization to finally obtain phosphate concentrate. By means of the pretreatment in the method, P2O5 content of the phosphate concentrate reaches32 +/- 1% and MgO content is lower than 0.50%. The method achieves enrichment of phosphorus and can produce nitro-compound fertilizers such as ammonium magnesium nitrate and ammonium calcium nitrate,thereby achieving utilization of the calcium and magnesium. The method is simple in process and great in adaptability, and has important significance on comprehensive utilization of resources.

Description

technical field [0001] The invention belongs to the fields of phosphorous chemical industry and phosphorous ore dressing production, and relates to a method for nitric acid pretreatment positive flotation phosphorous concentrate. Background technique [0002] The main industrial types of collophosite in Yunnan are calcareous, siliceous, and mixed types, with a complete range of types. The reserves are mostly mixed, followed by siliceous, and the least calcareous. The siliceous collophosphine accounts for about 1 / 3. Mixed-type phosphate rock has large reserves and low grade. At present, the positive-reverse process is used for enrichment. The cost of mineral processing is high, and the economic benefits are not significant, which is difficult for enterprises to accept. [0003] Nitric acid phosphate rock processing technology was first proposed by Russian scholars in 1908. In the 1920s, Germany first carried out industrial production. In 1928, Norwegian Oda Company successful...

Claims

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Application Information

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IPC IPC(8): B03D1/00C01B25/12C01F5/38C01F11/42C05C3/00
Inventor 何宾宾魏立军张晖姜威欧志兵龚丽宗世荣刘丽芬方竹堃
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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