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Screening-gravity separation technology added before obverse flotation operation of phosphorite

A technology of positive flotation and pre-operation, which is applied in the field of adding screening-gravity separation process before the positive flotation of phosphate rock, can solve the problems of non-universality and achieve the effect of process stability guarantee

Active Publication Date: 2019-10-25
YIDU XINGFA CHEM COMPANY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Ding Haitao et al. (Ding Haitao, Liu Zhihong. Experimental research on pre-enrichment of sedimentary silico-calcium phosphate rock by gravity separation [J]. Guizhou Chemical Industry, 2013, 38 (03): 3-5.) in the study of a sedimentary siliceous-calcium phosphate rock In the beneficiation test, the use of spiral chute gravity separation has achieved good technical indicators. However, when the ore processed by this method accounts for 35% of the ore fineness -0.074mm, the dissociation degree of collophosite monomer has already reached 73.80%. %, collophanite monomer particle size is relatively coarse and easy to dissociate, this method is not universal

Method used

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  • Screening-gravity separation technology added before obverse flotation operation of phosphorite
  • Screening-gravity separation technology added before obverse flotation operation of phosphorite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A screening-gravity separation process is added before the positive flotation of phosphate rock. The method described in this embodiment is:

[0021] Will P 2 o 5 Grade is 18.0wt%, MgO content is 3.0wt%, Al 2 o 3 The phosphate slurry with a content of 5.5wt% and a particle size of less than 0.074mm accounting for 70~85wt% is fed into the vibrating screen. The aperture of the vibrating screen is 0.15mm. The material on the screen is used as phosphorus concentrate I, and the material under the screen is fed into the third section Spiral chute re-election process, one-stage roughing to obtain phosphorus concentrate II and roughing tailings, the roughing tailings are fed into the second-stage sweeping to obtain phosphorous concentrate III and sweeping tailings, and the sweeping tailings are fed into Three stages of sweeping to obtain phosphorous concentrate IV and gravity tailings, gravity tailings fed into thickener, after the thickener thickened, concentration is 25wt...

Embodiment 2

[0025] A screening-gravity separation process is added before the positive flotation of phosphate rock. The method described in this embodiment is:

[0026] Will P 2 o 5 Grade is 24.7wt%, MgO content is 1.4wt%, Al 2 o 3 Content 4.7wt%, particle size less than 0.074mm accounted for 55 ~ 65wt% phosphate slurry is fed into the vibrating screen, the aperture of the vibrating screen is 0.10mm, the material on the screen is used as phosphorus concentrate I, and the material under the screen is fed into the spiral chute Gravity separation process, one-stage roughing to obtain phosphorous concentrate II and roughing tailings, the roughing tailings are sent to the second-stage sweeping to obtain phosphorous concentrate III and gravity tailings, and the gravity tailings are fed to the thickener After thickening by the thickener, the dense underflow with a concentration of 30wt% is fed into the positive flotation operation for flotation, and the phosphorous concentrate I, phosphorous...

Embodiment 3

[0030] A screening-gravity separation process is added before the positive flotation of phosphate rock. The method described in this embodiment is:

[0031] Will P2 o 5 Grade is 27.5wt%, MgO content is 1.2wt%, Al 2 o 3 Content 3.7wt%, particle size less than 0.074mm accounted for 45 ~ 54wt% phosphate slurry is fed into the vibrating screen, the aperture of the vibrating screen is 0.08mm, the material on the sieve is used as phosphorus concentrate I, and the material under the sieve is fed into the third section Spiral chute re-election process, one-stage roughing to obtain phosphorus concentrate II and roughing tailings, the roughing tailings are fed into the second-stage sweeping to obtain phosphorous concentrate III and sweeping tailings, and the sweeping tailings are fed into Three stages of sweeping to obtain phosphorus concentrate IV and gravity separation tailings, gravity separation tailings feed thickener, after thickener concentration, concentration is 35wt% dense ...

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Abstract

The invention relates to a method for pre-recovering phosphorus through a screening-gravity separation technology added before the obverse flotation operation of phosphorite. According to the technical scheme of the method, phosphorite pulp is fed into a vibrating mesh screen for grading before the obverse flotation operation, an oversize product serves as phosphate concentrate I, an undersize product is fed into a three-stage spiral chute gravity separation technology, first-stage rough separation is carried out so as to obtain phosphate concentrate II and rougher tailings, the rougher tailings are fed into second-stage scavenging so as to obtain phosphate concentrate III and scavenged tailings, the scavenged tailings are fed into third-stage scavenging so as to obtain phosphate concentrate IV and gravity-separated tailings, the gravity-separated tailings are fed into a thickener and are concentrated through the thickener so as to obtain a thick overflow and a thick underflow, the thick underflow is fed into the obverse flotation operation for obverse flotation, the thick overflow serves as circulating water, and the phosphate concentrate I, the phosphate concentrate II, the phosphate concentrate III and the phosphate concentrate IV are combined so as to obtain gravity-separated concentrate. The technology has the advantages that most of phosphorus in the phosphorite is recovered in advance before the obverse flotation operation, and therefore the treatment amount of the obverse flotation operation is effectively decreased, and the production cost of obverse flotation canbe remarkably lowered.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock beneficiation, and in particular relates to a screening-gravity separation process before the positive flotation operation of phosphate rock. Background technique [0002] my country has abundant reserves of phosphate rock resources, but P 2 o 5 The average grade is only about 17.0%, showing the characteristics of more low-grade ore and less rich ore. With the development of the phosphorus chemical industry, the reserves of rich ore are rapidly depleting, prompting people to study and utilize the most abundant reserves of siliceous and silicate-type and mixed-type two industrial types of low-grade phosphate rock. As an enhancement of phosphate rock P 2 o 5 The main technology of grade, the forward flotation process and the forward and reverse flotation process composed of forward flotation and reverse flotation are the methods with high efficiency for removing silicon and silicate gangu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03D1/00B03D103/06
CPCB03B7/00B03D1/00B03D2203/06
Inventor 刘鑫郑光明刘连坤邹学勇沈维云朱排场李防王旭东陈慧孙桦林刘兵兵
Owner YIDU XINGFA CHEM COMPANY
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