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Production method for producing high-quality phosphorus concentrate by combining physical classification and chemical treatment

A chemical treatment, high-quality technology, applied in the direction of solid separation, etc., can solve the problem of no phosphate ore dechromium technology reference, etc., to achieve the effect of improving the quality of phosphate concentrate, reducing the MER value, and improving the quality

Active Publication Date: 2019-01-08
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, there are no relevant technical reports on how to remove chromium by conventional mineral processing methods, and there is no reference for phosphate ore dechromium technology.

Method used

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  • Production method for producing high-quality phosphorus concentrate by combining physical classification and chemical treatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The content of P205 in the crude phosphate rock is 29.91%, MgO content is 1.07%, SiO2 content is 16.08%, Fe2O3 content is 0.89%, Al2O3 content is 1.58%, Cr content is 22.19ppm, Cr / P2O5=0.742×10-4, MER=0.118, pulp Concentration of 25%, after 38μm cyclone classification, obtained +38μm concentrate P205 content 29.51%, MgO content 1.46%, SiO2 content 16.42%, Fe2O3 content 0.66%, Al2O3 content 1.05%, Cr content 15.65ppm, Cr / P2O5=0.530 ×10-4, MER=0.108, the slurry concentration is 45%, add 5% sodium hexametaphosphate to the cyclone grading +38μm concentrate, control the pH value at 2~4 with inorganic acid, and stir at 100rpm. The slurry reaction was carried out at a temperature of 45℃ for 2 hours, and the filtrate was filtered and discharged to obtain solid high-quality phosphate concentrate 30.59%, MgO content 0.86%, Fe2O3 content 0.69%, Al2O3 content 0.87%, Cr content 15ppm, Cr / P2O5= 0.49×10-4 <0.526×10-4, MER=0.079 <0.08 (industry production index).

Embodiment 2

[0020] The content of P205 in the crude phosphate rock is 30.32%, the content of MgO is 1.03%, the content of SiO2 is 16.49%, the content of Fe2O3 is 0.85%, the content of Al2O3 is 1.48%, the content of Cr is 24.00ppm, Cr / P2O5=0.805×10-4, MER=0.111, pulp The concentration is 28%. After 38μm cyclone classification, the P205 content of +38μm concentrate is 30.33%, MgO content is 1.26%, SiO2 content is 16.01%, Fe2O3 content is 0.64%, Al2O3 content is 0.92%, Cr content is 17.25ppm, Cr / P2O5=0.573 ×10-4, MER=0.093, the concentration of the slurry is 50%, add 10% sodium hexametaphosphate to the cyclone grading +38μm concentrate, control the pH at 2~4 with inorganic acid, and stir at 200rpm, The slurry reaction was carried out at a temperature of 50℃ for 2 hours, and the filtrate was filtered out to obtain a solid high-quality phosphate concentrate of 30.65%, MgO content 0.62%, Fe2O3 content 0.69%, Al2O3 content 0.87%, Cr content 15ppm, Cr / P2O5= 0.489×10-4 <0.526×10-4, MER=0.071 <0.08 ...

Embodiment 3

[0022] In the crude phosphate rock, the P205 content is 28.92%, MgO content is 1.24%, SiO2 content is 16.91%, Fe2O3 content is 0.99%, Al2O3 content is 1.82%, Cr content is 24.05ppm, Cr / P2O5=0.831×10-4, MER=0.141, pulp Concentration of 23%, after 38μm cyclone classification, obtain +38μm concentrate P205 content 28.93%, MgO content 1.69%, SiO2 content 17.03%, Fe2O3 content 0.71%, Al2O3 content 1.15%, Cr content 6.65ppm, Cr / P2O5=0.582 ×10-4, MER=0.125, the slurry concentration is 60%, add 5% sodium pyrophosphate to the cyclone grading +38μm concentrate, use inorganic acid to control the pH value at 2~4, stirring speed 300rpm, temperature The slurry reaction was carried out at 55°C for 1.5 hours, and the filtrate was filtered and discharged to obtain solid high-quality phosphate concentrate 29.91%, MgO content 0.41%, Fe2O3 content 0.64%, Al2O3 content 0.59%, Cr content 14ppm, Cr / P2O5=0.468 ×10-4 <0.526×10-4, MER=0.055 <0.08 (industry production index).

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Abstract

The invention relates to a production method for producing high-quality phosphorus concentrate by combining physical classification and chemical treatment. The production method comprises the following steps that (1) coarse phosphorus ore concentrate with 20-30% ore pulp concentration is obtained; (2) 400-mesh or 500-mesh physical rotational flow grading is carried out on the coarse phosphorus oreconcentrate in step (1), products with bottom flows of +400 meshes or +500 meshes and products with over flows of -400 meshes or -500 meshes are obtained, and the products with over flows of -400 meshes or -500 meshes can be directly used as other purposes; sodium hexametaphosphate or sodium pyrophosphate are added into the phosphate ore products with +400 meshes or +500 meshes, the concentrationof the ore pulp is 40-70%, pH value is controlled by using an inorganic acid, and stirring is carried out, slurry mixing reaction is carried out under the condition that the temperature is 30-60 DEGC, then filtering is carried out, and the solid high-quality phosphorus concentrate is obtained; and (4), the solid high-quality phosphorus concentrate can meet the requirements of Cr and MER values in MDCP and MCP production though a concentrated acid method.

Description

Technical field [0001] The invention relates to a production method for improving high-quality phosphate concentrate by combining physical classification and chemical treatment. Background technique [0002] With the gradual depletion of phosphate rock, the increase of impurity content, and the increasing difficulty of wet-process phosphoric acid production and purification, at the same time, the new national standard of feed-grade calcium phosphate salt 2017 was released and implemented, which increased the limit value of chromium element content ≤ 30ppm, converted The content of chromium in the ore for wet-process phosphoric acid must be less than 15 ppm to meet the quality requirements. The content of phosphate rock is usually dozens of ppm. Due to the low content of chromium, it is difficult to distinguish the occurrence of chromium and other minerals. Furthermore, there are no relevant technical reports on how to remove chromium by conventional beneficiation methods, and th...

Claims

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Application Information

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IPC IPC(8): B03B9/00
CPCB03B9/00
Inventor 张晖杨稳权郭永杰何宾宾张华李海兵姜威龚丽
Owner YUNNAN PHOSPHATE CHEM GROUP CORP