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Method for recovering P2O5 in phosphorus ore dressing mill tailings

A technology of phosphate rock and tailings, which is applied in the field of tailings utilization and recovery of P2O5, can solve limited problems and achieve the effect of increasing recovery rate, improving recovery rate and reducing tailings discharge

Inactive Publication Date: 2010-06-30
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the P recovered by the above method 2 o 5 limited, most P 2 o 5 suppressed in the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 gets a certain amount of phosphorus dressing tailings slag (P 2 o 5 greater than 4%) with a 300-mesh standard sieve under wet sieve conditions to obtain two parts greater than 56 μm and less than 56 μm; then the part less than 56 μm is ground with a 0.5-1 liter rod mill until less than 56 μm accounts for more than 50%, Mix with the part less than 56 μm in the previous step to obtain tailings slurry B; then pour tailings slurry B into a 1-liter flotation machine, turn on the agitator, add water to adjust the concentration of the slurry to 20% to 25%, and add collector (addition amount According to 500g / t tailings), add sulfuric acid or phosphoric acid aqueous solution to adjust the pH value of the slurry to 4~6; stir for 30 seconds after adding the agent, open the inflation valve for 30 seconds, and then open the scraper to scrape the foam until the foam Two products, the concentrate C in the tank and the foamy tailings D, are obtained until the scraping is...

example 2

[0016] Example 2: All the tailings slurry produced in the primary beneficiation of a phosphate ore dressing plant is conveyed to a hydrocyclone for classification by pressure, and is divided into two parts of slurry larger than 56 μm and smaller than 56 μm, of which the part of slurry smaller than 56 μm overflows in the cyclone and enters directly The flotation machine is used for re-separation; the part of the slurry larger than 56 μm is sanded and enters the ball mill for regrinding, and then classified by the hydrocyclone. Regrinding forms a closed cycle; the pulp entering the beneficiation does not need to add collectors, and a small amount of acidic wastewater is added to adjust the pH value of the pulp to 4-6, and continuous foam scraping can finally obtain P 2 o 5 P 2 o 5 The recovery rate increased by 2% to 4%.

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Abstract

The invention provides a method for recovering P2O5 in phosphorus ore dressing mill tailings, which relates to a method for utilizing mill tailings. The method uses a hydraulic cyclone for pre-treating and dividing the mill tailings into two parts (mill tailings smaller than 56 mum and mill tailings larger than 56 mum) by aiming at the mill tailings with the P2O5 content higher than 5 percent produced in the carbonate type phosphorite phosphorus ore dressing process, wherein the part of mill tailings smaller than 56 mum with a large amount of residual ore dressing agents directly enters the ore dressing step, and the part of mill tailings larger than 56 mum is milled again by a ball mill to present the size smaller than 56 mum for entering the ore dressing step. The method comprises the following steps: firstly, separating the mill tailings according to the coarse grain grade and the fine grain grade; and carrying out secondary milling by the coarse grain grade part. The invention solves the problem of ore monomer dissociation, the fine grain grade part does not participate in the ore milling, and the over-pulverization and the argillization of the ore are reduced. Through grading the mill tailings with a large amount of residual ore dressing agents, the ore dressing agents can be regenerated and reutilized through being separated with the fine grains from the coarse grains, and few collecting agents or no collecting agent can be added for secondary ore dressing of the mill tailings. The method improves the phosphorus ore recovery rate, reduces the discharge amount of the mill tailings, conforms to the requirements of circulation and economy, and is suitable for ore dressing enterprises.

Description

technical field [0001] The present invention relates to beneficiation, and meanwhile, also relates to tailings utilization method, specifically, relates to reclaiming P from phosphate rock tailings 2 o 5 Methods. Background technique [0002] Under the current technical conditions, after beneficiation of sedimentary phosphate rock collophosite, the P in the tailings that are often discharged 2 o 5 The content is above 6%, some even as high as 15%, due to the P in the tailings 2 o 5 The content is too high, on the one hand, the recycling rate of resources is low, wasting resources, and the maximum utilization of resources has not been realized; on the other hand, the cost of mineral processing is high; at the same time, the tailings are piled up and occupy a large area. [0003] The existing patented technology is No. ZL200610018780.8 of Hubei Sanxin Phosphoric Acid Co., Ltd. "Method for producing phosphoric acid and by-product building bricks by using phosphorous tailin...

Claims

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Application Information

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IPC IPC(8): C01B25/12
Inventor 赵武强邵红生张仁忠曹江洪何德飞张瑛徐忠发杨安淬令狐昌锦
Owner WENGFU (GRP) CO LTD
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