CN102716808A

CN102716808A - Flotation process for difficultly selected coal slime with high middle density substance content

Info

Publication number: CN102716808A
Application number: CN2012102350960A
Authority: CN
Inventors: 王永田; 刘炯天; 于伟; 周杰; 周开洪; 王登月
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2012-07-09
Filing date: 2012-07-09
Publication date: 2012-10-10

Abstract

The invention discloses a flotation process for difficultly selected coal slime with high middle density substance content. The flotation process consists of five parts, namely preparing input floating coal slime into slurry, performing rough selection on the coal slime subjected to slurry preparation, grading cleaned coal subjected to rough selection, grinding and performing rough selection again on the coarse cleaned coal subjected to rough selection after the coarse cleaned coal is graded and performing fine selection on the fine cleaned coal subjected to rough selection. Flotation equipment is adopted and matched with corresponding concentration grading equipment and coal grinding equipment, so that a process of performing rough selection by the flotation equipment, grading the cleaned coal subjected to rough selection, grinding the coarse cleaned coal subjected to rough selection and independently performing fine selection on the fine cleaned coal subjected to rough selection is formed. Most high-ash gangue minerals are removed from the input floating coal slime after primary rough selection, so that the adverse influence of the high-ash fine slit on the subsequent coal slime grinding process is reduced; and due to the separation of coal and gangue integrated bodies in the coarse cleaned coal subjected to rough selection and further flotation recycling of the coal slime subjected to separation, the contradiction between the quality and the recycling rate of a difficultly selected coal slime separation product is avoided. The flotation process is simple, small in investment, low in power consumption and low in running cost. Compared with the conventional separation process, the flotation process is high in separation efficiency, high in combustible recycling rate and remarkable in economical benefit.

Description

The floatation process of density thing content difficult separation coal mud between a kind of senior middle school

Technical field

The present invention relates to a kind of slime separation technology, especially a kind of floatation process that is applicable to density thing content difficult separation coal mud between senior middle school belongs to the mineral separation technology field.

Background technology

Density is at 1.4g/cm in coal slime ³-1.8g/cm ³Between the weight of material proportion that accounts for total material surpass at 30% o'clock, it can be called as density thing coal slime between senior middle school.When middle density thing content was high, coal was many with the particle of spoil adhesion, can't coal realized effectively separating with spoil through flotation, caused coal losses in tail coal, and perhaps spoil is entrained in the cleaned coal; When middle density thing content was low, pure coal and pure spoil granule content were high, can effectively separate through simple flotation and produce coal and spoil.Along with maximizing, the raising of Mechanized Coal Mining Operation in China degree, resource deterioration of geological conditions, coal preparation plant build and the extensive use of the cyclone that heavily is situated between; The coal slime ratio sharply increases; Particularly when-0.074mm microfine coal slurry content is high, coarse granule coal slime intermediate density thing content is high, when ash content is high; Coal slime presents easy floating difficulty and selects phenomenon, and washability is poor.And coal preparation plant is in order to ensure cleans ash; Often through control floating agent consumption, roughly select technology means such as cleaned coal selects again and guarantee that cleans ash is qualified; And make the intermediate density thing in the coal slime finally get in the floating tail-coal; And the fine fraction coal slime can not obtain effective sorting, has wasted resource, has reduced the economic benefit of coal preparation plant.This is for the rare fertile coking coal resource of China's high-quality, a kind of especially great waste.Along with the continuous minimizing of the rare fertile coking coal resource reserves of high-quality,, the difficult separation coal mud of density thing content between senior middle school is carried out efficient sorting seem particularly urgent as non-renewable resources.

Conventional flotation process is to send into flotation column (or flotation device) after floatation feed is handled through sizing mixing, and flotation column (or flotation device) sub-elects cleaned coal and mine tailing, and gets into subsequent product processing operation separately.This technology is mainly used in the conventional sorting that is prone to coal separation mud, and uses for many years in China, has accumulated rich experience, is the most widely used floatation process of the present coal slime flotation of China.For density thing difficult separation coal mud sorting between senior middle school, this technology ubiquity product recovery rate and the low defective of production efficiency have seriously restricted final head coal product quality.The key technology of the efficient sorting of density thing difficult separation coal mud has become a difficult problem needing solution in the coal resources efficient clean utilization process badly between exploitation senior middle school.

Summary of the invention

Technical problem: the objective of the invention is to overcome the deficiency in the prior art, provide that a kind of low cost, technology are simple, small investment, the efficiency of separation are high, the process of density thing content difficult separation coal mud sorting between the senior middle school of remarkable in economical benefits.

Technical scheme: the floatation process of density thing content difficult separation coal mud between senior middle school of the present invention comprises with the I size mixing equipment float coal mud of going into that adds the I floating agent is sized mixing; The I black water of sizing mixing is sent into the I floatation equipment roughly select operation, obtain I floatation clean coal and I floating tail-coal; Also comprise the steps:

A. the I floatation clean coal that the I floatation equipment is floatingly selected is sent into concentrator and is carried out concentration, obtains underflow product and overflow product;

B. the underflow product is sent into the classifying equipoment classification, obtain sieving product and undersized product;

C. will sieve product and send into coal-grinding equipment ore grinding, obtain grinding the back product;

D. product behind the mill that adds the II floating agent is sent into the II size mixing equipment and size mixing the II black water that obtains sizing mixing;

E. the II black water is sent into the II floatation equipment and carry out sorting, obtain II floatation clean coal and II floating tail-coal;

F. overflow product and undersized product are sent to the III size mixing equipment, add the III floating agent and size mixing the III black water that obtains sizing mixing;

G. the III black water is sent into the III floatation equipment and carry out sorting, obtain III floatation clean coal and III floating tail-coal.

It is classifying cyclone or the screen cloth cyclone of 0.125mm or 0.15mm that described classifying equipoment adopts partition size; The II floating tail-coal ash content that said II floatation equipment sub-elects is higher than at 40% o'clock, as final tail coal product; The ash content of the II floating tail-coal that said II floatation equipment sub-elects is lower than at 40% o'clock, returns the sorting of sizing mixing once more of I size mixing equipment.

Beneficial effect: the present invention is a kind of practical technique based on the sorting of difficult separation coal mud, is the technological process of the difficult separation coal mud of density thing content between a kind of senior middle school being carried out efficient sorting.The present invention at first utilizes flotation technology that the difficult separation coal mud of density thing content between senior middle school is roughly selected operation; The thick cleaned coal of roughly selecting that will obtain then concentrates classification; The thick cleaned coal regrinding and reconcentration of coarse grain after the classification; The thick cleaned coal of particulate is selected separately, thereby realizes the efficient sorting of density thing content difficult separation coal mud between senior middle school.Go into float coal mud and remove the grey gangue mineral of most height through behind the one roughing; Reduced the adverse effect of the thin mud of high ash to the floating process of follow-up coal slime mill; Through roughly selecting the further floatation recovery of the back coal slime of dissociating and dissociate of coal and spoil intergrowth in the cleaned coal coarse fraction, solved the contradiction between the density thing content difficult separation coal mud sorted product quality and the rate of recovery between senior middle school.The invention has the advantages that: technology is simple, small investment, and power consumption is little, and operating cost is low.Compare with traditional sorting process, the efficiency of separation is high, remarkable in economical benefits.

Description of drawings

Fig. 1 is a sorting process FB(flow block) of the present invention.

Fig. 2 is sorting process device systems figure of the present invention.

Among the figure: A-I size mixing equipment, B-I floatation equipment, C-concentrator, D-classifying equipoment, E-coal-grinding equipment, F-II size mixing equipment, G-II floatation equipment, H-III size mixing equipment, I-III floatation equipment.

The specific embodiment

Below in conjunction with accompanying drawing one of the present invention is implemented to do further to describe:

The floatation process of density thing content difficult separation coal mud between senior middle school of the present invention adopts size mixing equipment, floatation equipment B, concentrator C, classifying equipoment D, coal-grinding equipment E, and its processing step is following:

A. the float coal mud 2 of going into that has added I floating agent 1 is sent into I size mixing equipment A, the float coal mud 2 of going into that adds I floating agent 1 is sized mixing the black water 3 that obtains sizing mixing through I size mixing equipment A;

B. the I black water 3 that will size mixing is sent into I floatation equipment B and is roughly selected operation, obtains I floatation clean coal 4 and I floating tail-coal 5;

C. the I floatation clean coal 4 that I floatation equipment B is floatingly selected is sent into concentrator C and is carried out concentration, obtains underflow product 6 and overflow product 7;

D. underflow product 6 is sent into classifying equipoment D classification, obtain sieving product 8 and undersized product 9; It is classifying cyclone or the screen cloth cyclone of 0.125mm or 0.15mm that described classifying equipoment adopts partition size.

E. will sieve product 8 and send into coal-grinding equipment E ore grinding, obtain grinding back product 10;

F. product 10 behind the mill that adds II floating agent 11 is sent into II size mixing equipment F and size mixing the II black water 12 that obtains sizing mixing;

G. II black water 12 is sent into II floatation equipment G and carry out sorting, obtain II floatation clean coal 13 and II floating tail-coal 14;

H. overflow product 7 and undersized product 9 are sent to III size mixing equipment H, interpolation III floating agent 15 stirs sizes mixing the III black water 16 that obtains sizing mixing;

I. III black water 16 is sent into III floatation equipment I and carry out sorting, obtain III floatation clean coal 17 and III floating tail-coal 18;

When II floating tail-coal 14 ash contents that floatingly select of II floatation equipment G are higher than 40%, as final tail coal product;

When II floating tail-coal 14 ash contents that floatingly select of II floatation equipment G are lower than 40%, return the I size mixing equipment A sorting of sizing mixing once more.

Claims

1. the floatation process of density thing content difficult separation coal mud between a senior middle school comprises with I size mixing equipment (A) the float coal mud (2) of going into that adds I floating agent (1) is sized mixing; The I black water (3) of sizing mixing is sent into I floatation equipment (B) roughly select operation, obtain I floatation clean coal (4) and I floating tail-coal (5); It is characterized in that, also comprise the steps:

A. the I floatation clean coal (4) that I floatation equipment (B) is floatingly selected is sent into concentrator (C) and is carried out concentration, obtains underflow product (6) and overflow product (7);

B. underflow product (6) is sent into classifying equipoment (D) classification, obtain sieving product (8) and undersized product (9);

C. will sieve product (8) and send into coal-grinding equipment (E) ore grinding, obtain grinding back product (10);

D. product (10) behind the mill that adds II floating agent (11) is sent into II size mixing equipment (F) and size mixing the II black water (12) that obtains sizing mixing;

E. II black water (12) is sent into II floatation equipment (G) and carry out sorting, obtain II floatation clean coal (13) and II floating tail-coal (14);

F. overflow product (7) and undersized product (9) are sent to III size mixing equipment (H), add III floating agent (15) and size mixing the III black water (16) that obtains sizing mixing;

G. III black water (16) is sent into III floatation equipment (I) and carry out sorting, obtain III floatation clean coal (17) and III floating tail-coal (18).

2. the floatation process of density thing content difficult separation coal mud between a kind of senior middle school according to claim 1 is characterized in that: it is classifying cyclone or the screen cloth cyclone of 0.125mm or 0.15mm that described classifying equipoment adopts partition size.

3. the floatation process of density thing content difficult separation coal mud between a kind of senior middle school according to claim 1; It is characterized in that: II floating tail-coal (14) ash content that said II floatation equipment (G) sub-elects is higher than at 40% o'clock; As final tail coal product; The ash content of the II floating tail-coal (14) that said II floatation equipment (G) sub-elects is lower than at 40% o'clock, returns I size mixing equipment (A) sorting of sizing mixing once more.