CN101759165A - Method for recovering P2O5 in phosphorus ore dressing mill tailings - Google Patents

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

P in a kind of recovery phosphorus ore dressing mill tailings 2O 5Method

Technical field

The present invention relates to ore dressing, simultaneously, also relate to mine tailing and utilize method, specifically, relate to from the rock phosphate in powder mine tailing and reclaim P ₂O ₅Method.

Background technology

Under the current techniques condition, after the ore dressing of appositional pattern phosphorite collophane, P in the mine tailing that often discharges ₂O ₅Content is all more than 6%, have in addition up to 15%, because P in the mine tailing ₂O ₅Content is higher, and the recovery utilization rate of resource is low on the one hand, and the waste resource does not realize the maximization of the utilization of resources; Beneficiation cost height on the other hand; Tailing heap is high-volume big simultaneously, and floor space is many.

Existing patented technology has " utilizing phosphorous mine tailing behind the flotation of phosphate rock to produce the method for phosphoric acid and byproduct building brick " ZL200610018780.8 number of Hubei Sanxin Phosphoric Acid Co., Ltd., this method is to add ground silica, coke powder (or colliery powder), kaolin powder to press mixing in the phosphorus mine tailing, add water, old, moulding, soak glaze after the oven dry, the loading of kiln car is gone into tunnel furnace; Obtain phosphorous vapor and CO through preheating, after heating up, absorb through hydrated tower again and obtain strong phosphoric acid, fragment of brick through heat exchange cooling back as the heavy-load bearing brick product.Another patent ZL200610146926.7 number of the said firm " phosphorus ore that directly reduces prepares the method for high-concentration phosphoric acid and the multiple silicon of by-product, aluminate products ", be in ground phosphate rock, to add ground silica, the coke powder, or coal dust, colliery powder, add kaolin or other additive, add the goods that water is made ball or made different shape behind the mixing, pack into after the drying and enter tunnel furnace in the refractory materials container, after preheating, intensification, obtain phosphorous vapor and CO, absorption obtains strong phosphoric acid through the hydration tower again, and the goods in the container obtain byproduct through cooling.Can be to P after mid low grade phosphate rock, the ore dressing ₂O ₅〉=6% mine tailing fully utilizes.But the P that said method reclaims ₂O ₅Limited, most of P ₂O ₅Be compressed in the goods.

Summary of the invention

The purpose of this invention is to provide P in a kind of recovery phosphorus ore dressing mill tailings ₂O ₅Method, to reduce the beneficiation cost of collophane, reduce resource consumption, improve the phosphor resource utilization rate.

The inventor is for the P that produces in the carbonate type phosphate rock beneficiated phosphate ore process ₂O ₅The mine tailing of content more than 5%, use the hydrocyclone preliminary treatment, mine tailing is divided into less than 56 μ m with greater than 56 μ m two parts, wherein be partly with most of remaining beneficiation reagent less than 56 μ m and directly enter ore dressing, after ball mill grinds less than 56 μ m again, enter together ore dressing greater than 56 μ m part.

The inventor is through inquiring into and test, and the method that provides comprises:

The first step is got flotation of phosphate rock P that process is got rid of ₂O ₅The Tailings Slurry A of content more than 5% uses classifying equipoment with its classification, obtains respectively greater than 56 μ m with less than two parts of 56 μ m;

Second step will be ground to less than more than the 56 μ m50% with grinding machinery greater than the part of 56 μ m, solid content was adjusted to 25% less than 56 μ m after partially mixed with the first step and obtained mine tailing slurry B;

The 3rd step poured Tailings Slurry B in the flotation device into, stirred and evenly mixed rear addings pH value adjusting agent, adjusted slurry pH to 4～5, added a small amount of WF-01 collecting agent stirring after 1-2 minute again, inflated and scrape bubble, treat foam scrape use up after, obtain containing P ₂O ₅2%～4% flotation froth and groove include P ₂O ₅Two ore pulp products of 25%～30%;

The foam that the 4th step scraped is a true tailings, directly is disposed to tailings reservoir for piling; The ore pulp of staying in the flotation cell is exactly the phosphorus concentrate that is reclaimed, and send to obtain product behind thickening filtration.

In the first step of aforesaid method, described stage equipment is a hydrocyclone, or trommel screen or vibratory screening apparatus.

In second step of aforesaid method, described grinding machinery is ball mill or rod mill.

In the 3rd step of aforesaid method, described adjustment agent is the acid waste water that phosphate fertilizer and phosphorous chemical industry industry produce; Described beneficiation collecting agent is special-purpose carbonate type phosphorite collecting agent in reverse floatation.

Method of the present invention is separated thick, fine fraction earlier before spoil reclaming, and coarse fraction partly carries out secondary grinding, solves the monomer dissociation problem of mineral, and the fine fraction part does not participate in ore grinding, and the minimizing ore is crossed and pulverized and clay mineral; Simultaneously, contain the mine tailing (froth pulp) of abundant residues medicament through classification, remaining medicament can separate with coarse grain with fine fraction, avoids medicament destroyed in ore grinding, plays the effect of medicament regeneration, thereby realizes that spoil reclaming adds or do not add collecting agent less; After ore dressing, can obtain P ₂O ₅Phosphorus concentrate more than 26%, P in the mine tailing ₂O ₅Content can drop to below 4% from 6%, and the phosphorus recovery rate in ore-dressing can improve more than 3%.Method of the present invention can improve the rate of recovery of phosphate rock resource, reduces the tailings discharging amount, meets the requirement of recycling economy.Be applicable to the enterprise of Rock Phosphate (72Min BPL) exploitation and ore dressing.

Embodiment

Embodiment 1 gets a certain amount of phosphorus milltailings slag (P ₂O ₅Greater than 4%) under the wet screening condition, carry out classification with 300 mesh standard sieves, obtain greater than 56 μ m with less than 56 μ m two parts; Then will partly be milled to less than 56 μ m with 0.5～1 liter rod mill barreling less than 56 μ m and account for more than 50%, with back less than the partially mixed Tailings Slurry B that obtains of 56 μ m; Afterwards Tailings Slurry B is poured in 1 liter of flotation device, drive agitator, add simultaneously water and adjust pulp density to 20%～25%, add aqueous solution adjustment slurry pH to 4～6 that collecting agent (addition is by the 500g/t mine tailing) adds sulfur acid or phosphoric acid again; Medicament adds 30 seconds of complete rear stirring, opens charging valve and drives the scraper plate device after 30 seconds and scrape bubble, obtains to the greatest extent concentrate C and two kinds of products of foam mine tailing D in the groove until foam scraped.After weighing after respectively concentrate C and mine tailing D being filtered, dry, sampling is analyzed, and qualified concentrate is as product.

Example 2: with whole Tailings Slurries of flotation of phosphate rock factory ore dressing generation, adopt pressure to be delivered to hydroclone classification, be divided into greater than 56 μ m with less than 56 μ m two parts ore pulps, wherein directly enter flotation device less than 56 μ m part ore pulp overflows in cyclone and carry out again sorting; Then enter ball mill ground again behind the ore grinding greater than 56 μ m part ore pulp sand settings, again through hydroclone classification, enter flotation less than the ore pulp of 56 μ m by overflow, return again the ball mill formation closed cycle of regrinding greater than 56 μ m part ore pulps are heavy; The ore pulp that enters ore dressing need not add collecting agent, adds a small amount of acid waste water and regulates slurry pH 4～6, scrapes continuously bubble, finally can obtain P ₂O ₅Be 25.00%～30.00%, MgO is 0.8%～3.5% phosphorus concentrate, whole process P ₂O ₅The rate of recovery has improved 2%～4%.

Claims (4)

1. one kind is reclaimed P in the phosphorus ore dressing mill tailings ₂O ₅Method, it is characterized in that this method comprises:

The first step is got the P that the flotation of phosphate rock process is got rid of ₂O ₅The Tailings Slurry A of content more than 5% uses classifying equipoment with its classification, obtains respectively greater than 56 μ m with less than two parts of 56 μ m;

Second step will be ground to less than 56 μ m with grinding machinery greater than the part of 56 μ m and account for more than 50%, solid content will be adjusted to 25% less than 56 μ m after partially mixed with the first step and obtain mine tailing slurry B;

The 3rd step poured Tailings Slurry B in the flotation device into, stirred and evenly mixed rear adding pH value adjusting agent, adjusted slurry pH to 4～5, added a small amount of WF-01 collecting agent again and stirred after 1～2 minute, inflated and scrape bubble, treated to obtain containing P after foam is scraped to the greatest extent ₂O ₅2%～4% flotation froth and groove include P ₂O ₅Two intermediate products of 26%～30% ore pulp;

The foam that the 4th step scraped is a true tailings, directly is disposed to tailings reservoir for piling; The ore pulp of staying in the flotation cell is exactly the phosphorus concentrate that is reclaimed, and send to obtain product behind thickening filtration.

2. the method for claim 1 is characterized in that in the first step, and described stage equipment is a hydrocyclone, or trommel screen or vibratory screening apparatus.

3. the method for claim 1 is characterized in that described grinding machinery is ball mill or rod mill in second step.

4. the method for claim 1 is characterized in that in the 3rd step, and described adjustment agent is the acid waste water that phosphate fertilizer and phosphorous chemical industry industry produce; Described beneficiation collecting agent is special-purpose carbonate type phosphorite collecting agent in reverse floatation.