CN102728455A

CN102728455A - Combined separation process for gravity concentration and flotation of difficult separation coal slime with high intermediate density material content

Info

Publication number: CN102728455A
Application number: CN2012102351484A
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: 2012-10-17
Anticipated expiration: 2032-07-09
Also published as: CN102728455B

Abstract

A refractory coal slime gravity separation flotation combined separation process with high intermediate density content. Classification equipment is used to classify. After classification, the fine-grained coarse-selected clean coal is directly flotation-selected to obtain fine-grained clean coal and tailings. Coal products: Coarse-grained coarse-separated clean coal adopts TBS interference bed gravity separation to obtain heavy-separated clean coal and heavy-separated tailing coal. The gravity-selected clean coal obtained by TBS interference bed separation is dehydrated through dehydration equipment to obtain the final gravity-selected clean coal product and sieve water, and the sieve water is combined into fine-grained coarse separation of clean coal; the process is through flotation rough separation A large amount of high-ash gangue minerals are thrown away during the operation, and the TBS disturbed bed gravity separation process is less affected by high-ash fine-grained gangue. Flotation roughing coarse-grained clean coal can be accurately sorted strictly according to density, and the separation efficiency is improved. The refractory coal slime with high intermediate density content can be effectively processed through the combined separation process of flotation and gravity separation, with low investment, low power consumption, low operating cost, high clean coal yield, and does not damage the particle size of clean coal products. composition.

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, 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.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; Get into cleaned coal and make that then cleans ash is higher; Gets into tail coal and then cause the rate of recovery to reduce, 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 the intermediate density thing in the coal slime is finally got 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 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 floatation equipment (flotation column or flotation device) after floatation feed is handled through sizing mixing, and flotation obtains concentrate and tailings, 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, 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, obtain that coarse grain is roughly selected cleaned coal and particulate is roughly selected cleaned coal;

B. coarse grain is roughly selected cleaned coal and send 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 send 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, practiced thrift 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, the cleaned coal output capacity is high and do not destroy the granularmetric composition of head coal product, remarkable in economical benefits.

Description of drawings

Fig. 1 is a process chart of the present invention.

The specific embodiment:

Below in conjunction with accompanying drawing one embodiment of the present of invention are done further to describe:

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

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 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 send 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 made up of high frequency sieve and coal slime centrifuge and dewater, obtain gravity treatment head coal product 8 and backwater 9;

F. particulate is roughly selected cleaned coal 5 and send into the II floatation equipment with backwater 9 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, filtrating is made recirculated water, the cleaned coal 12 after the dehydration of II dehydration equipment and be the head coal product of final election from the gravity treatment head coal product 8 of I dehydration equipment; From I dehydration equipment I floating tail-coal 3 that flows out and the II floating tail-coal 11 that the II floatation equipment flows plinth is final tail coal product.

Claims

1. A refractory coal slime gravity separation flotation combined separation process with high intermediate density content, including slurry mixing equipment for adding collectors and foaming agents to the floating coal slime; The coal slime water (1) is introduced into I flotation equipment for roughing operation to obtain I flotation clean coal (2) and I flotation tailing coal (3); it is characterized in that it also includes the following steps:

a. Sending the I flotation clean coal (2) into the classification equipment to classify to obtain the coarse coarse clean coal (4) and the fine rough clean coal (5);

b. sending the coarse-grained coarsely-selected clean coal (4) into the TBS interfering bed for gravity separation to obtain gravity-selected tailing coal (6) and heavy-selected clean coal (7);

c. Send the gravity-selected clean coal (7) into I dehydration equipment for dehydration to obtain the gravity-selected clean coal product (8) and sieve water (9);

d. Sending the fine-grained coarsely-selected clean coal (5) and sieved water (9) to II flotation equipment for beneficiation operation to obtain II flotation clean coal (10) and II flotation tailing coal (11);

e. The II flotation clean coal (10) is sent to the II dehydration equipment for dehydration to obtain a re-selection clean coal product (12).

2. The refractory coal slime gravity separation flotation combined separation process with high intermediate density content according to claim 1, characterized in that: the classification equipment adopts a classification rotary with a classification granularity of 0.125mm or 0.15mm Cyclone or screen cyclone.