CN102319717A

CN102319717A - Method for dryly discharging phosphate tailing

Info

Publication number: CN102319717A
Application number: CN201110164227A
Authority: CN
Inventors: 李万清; 杨泽荣; 王光明; 李宜平; 周丛胜
Original assignee: Hubei Sanning Chemical Co Ltd
Current assignee: Hubei Sanning Chemical Co Ltd
Priority date: 2011-06-19
Filing date: 2011-06-19
Publication date: 2012-01-18

Abstract

The invention relates to a method for dryly discharging phosphate tailing. The method comprises the following steps of: grinding phosphate ore for production into ore pulp through a grinder, and choosing impurities, namely the phosphate tailing, from the ore through reverse flotation; pumping the floated dilute-concentration fine-particle tailing into a tailing thickening tank through a tailing pump, and concentrating the tailing; pumping the concentrated tailing pulp into a vertical pressure filter through a tailing underflow pump, and extruding the pulp; and transporting dry residues of the extruded tailing to a residue field to stack, and directly recycling pressured and filtered water and overflow clarified water in the thickening tank after being settled through a settling tank. According to the method for dryly discharging the phosphate tailing disclosed by the invention, the moisture in the tailing is greatly reduced by extruding and filtering so that the purpose of dry discharge is achieved; the pressed and filtered water can be directly recycled; and the method for dryly discharging the phosphate tailing has the characteristics of low investment cost, high safety coefficient and good environment-friendly effect.

Description

A kind of phosphorus tailing dry row processing method

Technical field

The present invention relates to phosphorus mine tailing processing technology field, be specifically related to a kind of technology that adopts dry-extraction method that the phosphorus mine tailing is handled.

Background technology

Rock phosphate in powder is to produce phosphate fertilizer, yellow phosphorus, phosphoric acid and phosphatic primary raw material, and the processing of its mine tailing is a difficult problem always, at present; More domestic enterprises build the mine tailing storehouse and carry out the wet row of mine tailing, and mine tailing is stored up above 1,000,000,000 tons in more than 400 ten thousand in the existing big or small mine tailing storehouse of China; And annual increase progressively with several hundred million tons, 30,000,000,000 yuan of the annual economic losses that pollutes because of solid waste wherein annually are used for tailings impoundment for hundred million yuan with 10-15; 15-25 is used to safeguard the mine tailing storehouse for hundred million yuan, and the investment cost number is big.Along with the expansion of mine capacity and the prolongation of production history, the land seizure area constantly enlarges, and build in the mine tailing storehouse and administrative expenses can constantly increase; And there is serious potential safety hazard in the wet row's of mine tailing tailing dam, and possibility of dam break all arranged at any time, and also peripheral resident's life security is arrived in serious threat.In addition,, can't directly recycle, also overflow to the external world easily, bring severe contamination and harm to people's production, life and ecological environment because of not process clarification of the moisture among the wet row.

Summary of the invention

The objective of the invention is to overcome above-mentioned deficiency, a kind of employing full-automatic vertical filter-press arrangement is provided, small investment, the phosphorus tailing dry row processing method that safety coefficient is high, environment protecting is good.

The objective of the invention is to realize like this: a kind of phosphorus tailing dry row processing method, comprise following process: the rock phosphate in powder of production usefulness grinds to form ore pulp through grinder, selects the impurity in the ore pulp through reverse flotation, i.e. the phosphorus mine tailing; The dilute concentration fine grained mine tailing that floatingly selects is evacuated to the mine tailing thickening pond through tailings pump and carries dense; Carrying mine tailing slurry after dense is evacuated to vertical type blotter press through mine tailing underflow pump and pushes; Tailing dry slag after the extruding is transported to the slag field and stacks, and the overflow primary water of water after the press filtration and thickening pond is directly recycled after the settling tank sedimentation.

Described vertical type blotter press is the full-automatic vertical filter press, adopts fine and closely woven filter cloth, and working pressure reaches the above water under high pressure of 1.0MPa and pushes through filter press sheet frame barrier film, and utilizes the above dry air of pressure 0.6MPa to carry out air-dry again.

The rock phosphate in powder of production usefulness grinds to form ore pulp through grinder, and particle diameter accounts for 65%-85% of total quality of material less than 200 order materials in the ore pulp.

Described reverse flotation is selected the impurity in the ore, i.e. phosphorus mine tailing is meant that fineness is lower than 450 order content in the mine tailing that is selected to account for more than 65% that concentration is 15%.

The mine tailing thickening pond is carried dense being meant tailings concentration is brought up to 50%-65%.

Phosphorus tailing dry row processing method provided by the invention has following beneficial effect:

1, phosphorus tailing dry of the present invention is arranged the full-automatic vertical filter press that is adopted; The water that in pressure-filtering process, produces can be recycled, and filtrates and select factory through direct backflow the in filter press extruding back, thereby has reduced loss; Fully recycle the moisture after mine tailing pushes, practiced thrift resource effectively;

2, reduced capital cost, the project investment expense of 300,000 tons of/year phosphorus mine tailing treating capacities has altogether 1,000 ten thousand together with personnel's wage, and the wet row of mine tailing needs to build tailing dam, and investment cost is more than 50,000,000;

3, improved the production safety coefficient, adopted the row of doing, do heap, the ground point selection of stacking is wide, and is less to peripheral resident's life influence.And there is serious potential safety hazard in the wet row's of mine tailing tailing dam, the possibility of dam break is all arranged at any time, the also serious life security that threatens peripheral resident;

4, environment protecting is good, does the moisture that contains in the last person ore deposit and can directly recycle, and the environment that can not flow to outer bound pair periphery pollutes.Wet row then because the moisture in the mine tailing not through clarification, can't directly be recycled, and overflow to the external world easily, pollutes environment.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is described further.

Fig. 1 is a process flow diagram of the present invention.

The specific embodiment

1, with the rock phosphate in powder of production usefulness after grinder grinds, reach-200 order fineness and account for 65%-85% ore pulp, select the phosphorus mine tailing of ore pulp through reverse flotation, the mine tailing fineness-450 purpose content that is selected accounts for more than 65%, concentration is 15%;

2, the dilute concentration fine grained mine tailing that reverse flotation is obtained is evacuated to the mine tailing thickening pond through tailings pump and clarifies and carry densely, and tailings concentration is promoted to 50%-65%;

3, the overflow water microsize grade content after the clarification is at 100mg/L; Water quality is limpider, can directly return system's utilization, and the mine tailing slurry of carrying after dense is evacuated to the press filtration post through thickening pond underflow pump; Adopt the full-automatic vertical filter press; The water under high pressure above with pressure 1.0MPa pushes through filter press sheet frame barrier film, and utilizes pressure to reach the above dry air of 0.6MPa again and carry out air-dryly, and the moisture in the mine tailing is reduced to below 20%;

4, the tailing dry slag water content after the extruding is transported to the slag field through automobile and stacks at 10-20%, and the water after the press filtration directly reclaims after flowing to the settling tank sedimentation.

Claims

1. a phosphorus tailing dry is arranged processing method, and it is characterized in that: comprise following process: the rock phosphate in powder of production usefulness grinds to form ore pulp through grinder, selects the impurity in the ore pulp through reverse flotation, i.e. phosphorus mine tailing slurry; The dilute concentration fine grained mine tailing that floatingly selects is evacuated to the mine tailing thickening pond through tailings pump and carries dense; Carrying mine tailing slurry after dense is evacuated to vertical type blotter press through mine tailing underflow pump and pushes; Tailing dry slag after the extruding is transported to the slag field and stacks, and the overflow primary water of water after the press filtration and thickening pond is directly recycled after the settling tank sedimentation.

2. phosphorus tailing dry row processing method according to claim 1; It is characterized in that: described vertical type blotter press is the full-automatic vertical filter press; Adopt fine and closely woven filter cloth; The above water under high pressure of working pressure 1.0MPa pushes through filter press sheet frame barrier film, and utilizes the above dry air of pressure 0.6MPa to carry out air-dry again.

3. phosphorus tailing dry row processing method according to claim 1, it is characterized in that: the rock phosphate in powder of production usefulness grinds to form ore pulp through grinder, and particle diameter accounts for 65%-85% of total quality of material less than 200 order materials in the ore pulp.

4. phosphorus tailing dry according to claim 1 row processing method, it is characterized in that: described reverse flotation is selected the impurity in the ore, i.e. and phosphorus mine tailing slurry is meant that fineness is lower than 450 order content in the mine tailing that is selected to account for more than 65% that concentration is 15%.

5. phosphorus tailing dry row processing method according to claim 1, it is characterized in that: the mine tailing thickening pond is carried dense being meant tailings concentration is brought up to 50%-65%.