Process method for removing phosphate impurities by combining gravity, centrifugal force and flotation

A process method and centrifugal force technology, applied in the collophosite field, can solve the problems such as the unreported industrial process of ore dressing, and achieve the effects of improving the grade of phosphate rock, increasing the recovery rate, and reducing the consumption of chemicals

Inactive Publication Date: 2012-10-10
KUNMING CHUAN JINNUO CHEM IND
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  • Abstract
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AI Technical Summary

Problems solved by technology

So far, there is no report on the industrialized process of mineral processing using aqueous medium cyclone-decanter centrifuge-reverse flotation

Method used

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  • Process method for removing phosphate impurities by combining gravity, centrifugal force and flotation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0024] Operate according to the following steps:

[0025] ⑴ will contain P 2 o 5 It is 22%~25% collophosite wet ground to a fineness of -200 mesh 85%~90%, and a slurry with a solid content of 30%~35%;

[0026] ⑵Put the ore slurry into the water medium cyclone, and the ore feeding pressure is 1.5kg / cm 2 ~2.5kg / cm 2 ;

[0027] ⑶Water medium cyclone tailings at 70~85m 3 / h is fed into the decanter centrifuge; the drum speed of the decanter centrifuge is 2200r / min; the differential speed between the drum and the screw is 40r / min;

[0028] (4) Phosphoric acid is added to the concentrate of the decanter centrifuge to adjust the pH value of the pulp to 4~5;

[0029] ⑸The adjusted ore pulp enters the flotation machine, and at the same time, add sodium linoleate, a collector for magnesium removal, at a dosage of 500g / T, which is aerated and foamed.

[0030] Get Grade I Concentrate P 2 o 5 content of 30.0%~31.5%, MgO content of 0.9%~1.5%, R 2 o 3 The content is 1.2%~1.5%; Gra...

Embodiment 3

[0032] Operate according to the following steps:

[0033] ⑴ will contain P 2 o 5 It is 23%~25% collophosite wet ground to a fineness of -200 mesh 75%~85%, and a slurry with a solid content of 35%~40%;

[0034] ⑵Put the ore slurry into the water medium cyclone, and the ore feeding pressure is 1.5kg / cm 2 ~2.5kg / cm 2 ;

[0035] ⑶Water medium cyclone tailings at 60~80m 3 / h is fed into the decanter centrifuge; the drum speed of the decanter centrifuge is 1800r / min; the differential speed between the drum and the screw is 25r / min;

[0036] (4) Fluosilicic acid is added to the concentrate of the decanter centrifuge to adjust the pH value of the pulp to 4~5;

[0037] (5) The adjusted ore pulp enters the flotation machine, and at the same time, add the magnesium removal agent sodium stearate, the dosage is 600g / T, after aeration, scrape foam.

[0038] Get Grade I Concentrate P 2 o 5 content of 29.0%~31.5%, MgO content of 0.7%~1.0%, R 2 o 3 The content is 1.2%~1.8%; Grade II...

Embodiment 4

[0040] Operate according to the following steps:

[0041] ⑴ will contain P 2 o 5 Wet grinding of 23%~26% collophosite to a slurry of -200 mesh 90%~95% with a solid content of 20%~25%;

[0042] ⑵Put the ore slurry into the water medium cyclone, and the ore feeding pressure is 1.5kg / cm 2 ~2.5kg / cm 2 ;

[0043] ⑶Water medium cyclone tailings at 85~100m 3 / h is fed into the decanter centrifuge; the drum speed of the decanter centrifuge is 1500r / min; the differential speed between the drum and the screw is 10r / min;

[0044] (4) Sulfuric acid is added to the concentrate of the decanter centrifuge to adjust the pH value of the pulp to 4~5;

[0045] (5) The adjusted ore pulp enters the flotation machine, and at the same time, add the magnesium removal agent sodium oleate, the dosage is 450g / T, after aeration, scrape foam.

[0046] Get Grade I Concentrate P 2 o 5 content of 30.0%~31.0%, MgO content of 0.8%~1.4%, R 2 o 3 The content is 1.4%~1.8%, the grade II concentrate P 2...

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Abstract

The invention relates to a process method for removing phosphate impurities by combining gravity, centrifugal force and flotation. By the aid of the mineral processing flow sheet of a water-only cyclone, a horizontal screw decanter centrifuge and reverse flotation, the process method includes the steps: (1) taking phosphate ore which is colloid phosphate and setting the content of P2O5 to range from 22% to 27%; (2) grinding the phosphate ore to have -200 meshes larger than 75% by a wet method and setting the solid content of ore pulp to range from 20% to 45%; (3) throwing the ore pulp into the water-only cyclone and setting feed pressure to range from 1.5kg / cm<2> to 2.5kg / cm<2> to obtain first-grade concentrate; (4) feeding tailings in the water-only cyclone into the horizontal screw decanter centrifuge at the speed of 50-100m<3> / h, setting the speed of a rotary drum of the horizontal screw decanter centrifuge to range from 1500r / min to 2500r / min and setting the differential speed of the rotary drum and a screw to range from 10r / min to 50r / min; (5) adding regulators into the concentrate in the horizontal screw decanter centrifuge and regulating the pH (potential of hydrogen) value of the ore pulp to range from 4 to 5; and (6) feeding the regulated ore pulp into a flotation machine, adding 400g / T-600g / T of magnesium removing collectors into the regulated ore pulp, and performing inflation and defoaming to obtain second-grade concentrate. The process method has the advantages that agent consumption in a flotation process is reduced by the process method, other impurities can be removed, the grade of the phosphate is greatly improved, and the recovery rate is also increased.

Description

technical field [0001] The invention belongs to the technical field of collophosite, especially the mineral processing method of reverse flotation of collophanite. Background technique [0002] With the depletion of high-quality phosphate rock resources, low- and medium-grade phosphate rock cannot meet the use requirements and must be processed before use. At present, phosphate rock ore dressing mostly adopts positive flotation to enrich phosphorus grade, and reverse flotation The method of magnesium removal. Although direct flotation can greatly improve the phosphorus grade, but the chemical consumption is high, 2~4kg is required, the cost of mineral processing is high, and the chemical agent is greatly affected by the temperature. Impurities, the grade of phosphate rock has not improved much. Gravity separation equipment is seldom used for separation due to its low recovery rate. It mainly forms closed-circuit grinding with grinding equipment to control the fineness of o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B1/00
Inventor 曾润国魏家贵杨兴刘泽祥周永祥刘甍赵家荣
Owner KUNMING CHUAN JINNUO CHEM IND
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