CN102728455B

CN102728455B - Combined separation process for gravity concentration and flotation of difficult separation coal slime with high intermediate density material content

Info

Publication number: CN102728455B
Application number: CN 201210235148
Authority: CN
Inventors: 王永田; 刘炯天; 于伟; 周开洪; 周杰
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: 2013-08-21
Anticipated expiration: 2032-07-09
Also published as: CN102728455A

Abstract

The invention discloses a combined separation process for gravity concentration and flotation of difficult separation coal slime with a high intermediate density material content. A grading device is used for grading; the flotation and fine separation work is directly carried out on the fine grain rough concentration clean coal so as to obtain clean coal and fine-grain-grade tailing coal; the rough grain rough concentration clean coal is subjected to gravity concentration by using a TBS (Teetered Bed Separator) teetered bed so as to obtain the gravity concentration fine coal and gravity concentration tailing coal; the gravity concentration fine coal obtained through the separation of the TBS teetered bed is dehydrated through a dehydrating device so as to obtain final gravity concentration fine coal product and backwater; and the backwater is combined and enters into the fine concentration working of the fine grain rough concentration fine coal. With the adoption of the process, a great deal of high ash gangue mineral is abandoned through the flotation and rough concentration work; the TBS teetered bed gravity concentration process is less influenced by the high ash fine grain gangue; the flotation rough concentration rough grain fine coal can be separated in accordance with the density strictly; the separation efficiency is improved; the difficult separation coal slime with a high intermediate density material content is effectively processed through the combined separation of flotation and gravity concentration; the investment is less; the electricity consumption is small; the operation cost is low; the fine coal yield is high; and the granularity composition of fine coal product is not damaged.

Description

The flotation combined sorting process of difficult separation coal mud gravity treatment of density thing content between senior middle school

Technical field

The present invention relates to a kind of slime separation technology, especially a kind of flotation combined sorting process of difficult separation coal mud gravity treatment that is applicable to density thing content between senior middle school.

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, coal can't be realized effectively separating with spoil by 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 height can effectively separate by simple flotation and to produce coal and spoil.Between senior middle school the characteristics of density thing content difficult separation coal mud mainly show the density of coal slime form in big, the several respects such as ash content is high, floatability difference of intermediate density level content, wherein intermediate density thing content is the bottleneck of restriction difficult separation coal mud sorting greatly always.This part coal slime is when flotation, enter cleaned coal and make that then cleans ash is higher, entering tail coal then causes the rate of recovery to reduce, and coal preparation plant is in order to ensure cleans ash, often by control floating agent consumption, roughly select technology means such as cleaned coal selects again and guarantee that cleans ash is qualified, and the intermediate density thing in the coal slime is finally entered in the floating tail-coal, waste resource, 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 great waste especially.Along with the continuous minimizing of the rare fertile coking coal resource reserves of high-quality, as non-renewable resources, the difficult separation coal mud of density thing content between senior middle school is carried out efficient sorting seem particularly urgent.

Conventional flotation process is to send into floatation equipment (flotation column or flotation device) after floatation feed is handled through sizing mixing, and flotation obtains concentrate and tailings, and enters subsequent product processing operation separately.This technology is mainly used in the conventional easily sorting of coal separation mud, and uses for many years in China, and for the sorting of density thing content difficult separation coal mud between senior middle school, the intermediate density thing that it is difficult in effective slime separation makes intermediate density level product often be lost in the tail coal.The efficient sorting technology of density level 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 weak point in the prior art, the flotation combined sorting process of difficult separation coal mud gravity treatment of density thing content between the senior middle school of provide that a kind of technology is simple, small investment, the efficiency of separation are high.

Technical scheme: the flotation combined sorting process of difficult separation coal mud gravity treatment of density thing content between senior middle school of the present invention: comprise with size mixing equipment the float coal mud of going into that adds collecting agent, foaming agent is sized mixing; The black water of sizing mixing is introduced 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 is sent into classifying equipoment to carrying out classification, obtained that coarse grain is roughly selected cleaned coal and particulate is roughly selected cleaned coal;

B. coarse grain is roughly selected cleaned coal and sent into TBS and disturb bed to carry out gravity separation, obtain gravity treatment tail coal and gravity treatment cleaned coal;

C. the gravity treatment cleaned coal is sent into the I dehydration equipment and dewater, obtain gravity treatment head coal product and backwater;

D. particulate is roughly selected cleaned coal and backwater and sent into the II floatation equipment and carry out selected operation, obtain II floatation clean coal and II floating tail-coal;

E. the II floatation clean coal is sent into the II dehydration equipment and dewater, obtain the final election head coal product.

Described classifying equipoment adopts partition size to be 0.125mm or to be the classifying cyclone of 0.15mm or screen cloth cyclone.

Beneficial effect: the present invention utilizes flotation technology earlier the difficult separation coal mud of density thing content between senior middle school to be roughly selected operation, the thick cleaned coal of roughly selecting that will obtain then carries out classification, the thick cleaned coal of coarse grain utilizes TBS to disturb the bed gravity separation after the classification, and the thick cleaned coal of particulate is still handled with floatation.Because a large amount of high grey gangue minerals of jettisoning when roughly selecting, the thick cleaned coal mineral composition of coarse grain improves, and when adopting TBS to disturb the bed gravity separation, the thick cleaned coal of coarse grain can be according to the accurate sorting of density; And the fine grained in the thick cleaned coal utilizes further deliming upgrading of flotation technology.Solved owing to the high coal slime difficulty that causes of the intermediate density thing content thin cement content of high and high ash is selected problem, can improve clean coal recovery, saved cost simultaneously.The II floatation clean coal can obtain qualified recirculated water after II dehydration equipment processed.Compare with traditional handicraft, solved the contradiction between the type slime separation product quality and the rate of recovery, with strong points, cost is low, technology is simple, small investment, power consumption is little, operating cost is low, cleaned coal output capacity height and do not destroy the granularmetric composition of head coal product, remarkable in economical benefits.

Description of drawings

Fig. 1 is process chart of the present invention.

The specific embodiment:

Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:

The flotation combined sorting process of difficult separation coal mud gravity treatment of density thing content between senior middle school of the present invention,

A. the float coal mud of going into that at first with black water concentration is 60～120g/L is sent into size mixing equipment, adds collecting agent and foaming agent in existing routine techniques ratio, by size mixing equipment the float coal mud of going into that adds collecting agent, foaming agent is sized mixing;

B. the black water 1 that will size mixing is introduced the I floatation equipment and is roughly selected operation, obtains I floatation clean coal 2 and I floating tail-coal 3, and gained I floatation clean coal rate is 70%～90%;

C. I floatation clean coal 2 is sent into classifying equipoment to carrying out classification, classifying equipoment adopts partition size to be 0.125mm or to be the classifying cyclone of 0.15mm or screen cloth cyclone, and classified sizing of equipment obtains that coarse grain is roughly selected cleaned coal 4 and particulate is roughly selected cleaned coal 5;

D. coarse grain is roughly selected cleaned coal 4 and sent into TBS and disturb bed to carry out gravity separation, obtain gravity treatment tail coal 6 and gravity treatment cleaned coal 7;

E. gravity treatment cleaned coal 7 is sent into the I dehydration equipment that is constituted by high frequency sieve and coal slime centrifuge and dewatered, obtain gravity treatment head coal product 8 and backwater 9;

F. particulate is roughly selected cleaned coal 5 and backwater 9 and sent into the II floatation equipment and carry out selected operation, obtain II floatation clean coal 10 and II floating tail-coal 11;

G. II floatation clean coal 10 is sent into the II dehydration equipment and dewater, filtrate is made recirculated water, the cleaned coal 12 after the II dehydration equipment dehydration and be the head coal product of final election from the gravity treatment head coal product 8 of I dehydration equipment; The I floating tail-coal 3 that flows out from the I dehydration equipment and the II floating tail-coal 11 of II floatation equipment stream plinth are final tail coal product.

Claims

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

A. I floatation clean coal (2) is sent into classifying equipoment and carry out classification, obtain that coarse grain is roughly selected cleaned coal (4) and particulate is roughly selected cleaned coal (5); Described classifying equipoment adopts partition size to be 0.125mm or to be the classifying cyclone of 0.15mm or screen cloth cyclone;

B. coarse grain is roughly selected cleaned coal (4) and sent into TBS and disturb bed to carry out gravity separation, obtain gravity treatment tail coal (6) and gravity treatment cleaned coal (7);

C. gravity treatment cleaned coal (7) is sent into the I dehydration equipment and dewater, obtain gravity treatment head coal product (8) and backwater (9);

D. particulate is roughly selected cleaned coal (5) and backwater (9) and sent into the II floatation equipment and carry out selected operation, obtain II floatation clean coal (10) and II floating tail-coal (11);

E. II floatation clean coal (10) is sent into the II dehydration equipment and dewater, obtain head coal product (12).