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Combined physical classification and chemical treatment to improve the production method of high-quality phosphorus concentrate

A chemical treatment, high-quality technology, applied in the direction of solid separation, etc., can solve the problems of no phosphate ore dechromium technology for reference, and achieve the effect of improving the quality of phosphate concentrate, reducing the content of chromium in the medium, and removing Cr elements

Active Publication Date: 2021-03-23
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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  • Combined physical classification and chemical treatment to improve the production method of high-quality phosphorus concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] P205 content in 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%, through 38μm cyclone classification, +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 pulp concentration is 45%, the cyclone graded + 38μm concentrate is added to 5% sodium hexametaphosphate, the pH value is controlled at 2~4 with inorganic acid, the stirring speed is 100rpm, Under the condition of temperature of 45°C, the pulping reaction was carried out for 2 hours, and the filtrate was filtered and discharged to obtain a solid high-quality phosphorus concentrate of 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 i...

Embodiment 2

[0020] P205 content in crude phosphate rock is 30.32%, MgO content is 1.03%, SiO2 content is 16.49%, Fe2O3 content is 0.85%, Al2O3 content is 1.48%, Cr content is 24.00ppm, Cr / P2O5=0.805×10-4, MER=0.111, pulp Concentration of 28%, through 38μm cyclone classification, +38μm concentrate P205 content 30.33%, MgO content 1.26%, SiO2 content 16.01%, Fe2O3 content 0.64%, Al2O3 content 0.92%, Cr content 17.25ppm, Cr / P2O5=0.573 ×10-4, MER=0.093, the pulp concentration is 50%, add the cyclone graded + 38μm concentrate to 10% sodium hexametaphosphate, use inorganic acid to control the pH value at 2~4, and the stirring speed is 200rpm, Under the condition of temperature 50°C, carry out the pulping reaction for 2 hours, filter and discharge the filtrate, and obtain solid high-quality phosphorus 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 (industry production index).

Embodiment 3

[0022] P205 content in crude phosphate rock 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, +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 pulp concentration is 60%, the cyclone graded + 38μm concentrate is added into 5% sodium pyrophosphate, the pH value is controlled at 2~4 with inorganic acid, the stirring speed is 300rpm, the temperature Under the condition of 55 ℃, carry out the pulping reaction for 1.5 hours, filter and discharge the filtrate, and obtain solid high-quality phosphorus concentrate with 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 combining physical classification and chemical treatment to promote high-quality phosphorous concentrate. Background technique [0002] With the gradual depletion of phosphate rock, the increase of impurity content, and the difficulty of purification of wet-process phosphoric acid production, at the same time, the 2017 version of the new national standard for feed-grade calcium phosphate salt was released and implemented, and the limit value for chromium content was increased to ≤30ppm. The content of chromium element in the ore for wet-process phosphoric acid must be less than 15ppm to meet the quality requirements. The content in phosphate rock is usually dozens of ppm. Due to the low content of chromium, it is difficult to distinguish the occurrence of chromium from other minerals. Furthermore, there are no related technical reports on how to remove chromium elements by conventional mineral processin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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