CN102430481A

CN102430481A - Sorting process for high-ash and difficult-separation coal slime

Info

Publication number: CN102430481A
Application number: CN201110317595XA
Authority: CN
Inventors: 刘炯天; 桂夏辉; 张海军
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2011-10-19
Filing date: 2011-10-19
Publication date: 2012-05-02
Anticipated expiration: 2031-10-19
Also published as: CN102430481B

Abstract

Disclosed is sorting process for high-ash and difficult-separation coal slime. Floatation coal slime is fed into a stirring barrel to be prepared into ore pulp with percentage concentration of 80g/L-120g/L, the ore pulp automatically flows to roughing and floatation equipment to be sorted, roughing tail coal enters a cyclone to be concentrated in a classified manner, concentrated bottom flow products enter a high-frequency screen to be dewatered, dewatered substances on the high-frequency screen return to roughing pulp mixing operation to be sorted again after being finely ground via a ball mill, floatation rough and fine ores are fed to a precipitation perforated basket centrifuge to be dewatered, after being dewatered via the precipitation perforated basket centrifuge, fine ore filter liquor is fed into concentration flotation equipment to be concentrated, and concentration tail coal and overflow of the ball mill return to roughing pulp mixing operation together via a pipeline to be sorted again. Accordingly, low-ash and high-recovery-rate flotation clean coal is obtained. The sorting process not only avoids influence of high-ash content and fine particle slime and integrated ore to a floatation process, but also avoids contradiction between the quality and the recovery rate of a high-ash difficult-separation coal slime sorted product.

Description

A kind of sorting process of high grey difficult separation coal mud

Technical field

The present invention relates to the sorting process of coal slime, especially a kind of being applicable to roughly selected the cleaned coal fine grinding sorting process of high grey difficult separation coal mud of choosing that dissociates again.

Background technology

Along with raising, resource deterioration of geological conditions, coal preparation plant's maximization of Mechanized Coal Mining Operation in China degree are built and the dense medium separation broad application; High grey difficult separation coal mud ratio sharply increases, and its characteristics show mainly that coal content is big in the coal slime, ash content is high, fine size, washability difference several respects.Wherein particularly-200 the fine coal content of purpose increases, and often ash content is higher because the thin mud of high ash is carried secretly to cause floatation clean coal, and the coarse granule intergrowth also produces interference to floatation process; The ash content of intergrowth mineral is general and coal ash is approaching; Ratio accounts for about 20% of raw coal, and intergrowth part as entering cleaned coal part are then polluted cleaned coal; If the intergrowth part does not reclaim; Get into the tail coal part, make that then the tail coal part is on the low side, so thin dirt is dyed the key factor that has become the final head coal product quality of serious restriction with the sorting problem of intergrowth mineral.Patent announcement number is: a kind of slime separation technology of CN101757982A, consider of the influence of intergrowth mineral to flotation recovery rate, and taked the dissociate technology of flotation again of intergrowth ore grinding; This technology can improve clean coal recovery; But the thin cement content of the product after levigate increases, and is easy to pollute cleaned coal, and cleans ash is difficult to be guaranteed; So this arts demand is further perfect, particularly to take measures aspect the control of quality of cleaned coal.

Conventional flotation process is that floatation feed is sent into flotation column (or flotation device) after the ore pulp preprocessor is handled, and flotation column (or flotation device) sub-elects concentrate and tailings, and gets into subsequent product processing operation separately.This technology mainly is applicable to the conventional sorting that is prone to coal separation mud; Be widely used in China; But to high grey difficult separation coal mud; This technology exists product recovery rate and the low defective of production efficiency, is difficult to solve the thin mud of high ash and carries secretly and the influence of intergrowth mineral to floatation process, so the key technology of the efficient sorting of the exploitation grey difficult separation coal mud of adaptive height has become a difficult problem needing solution in the coal resources efficient clean utilization process badly.

Summary of the invention

Technical problem: the present invention seeks to overcome the weak point in the prior art, in provide a kind of low cost, technology rationally, the floatation process of the high grey difficult separation coal mud sorting of high, the remarkable in economical benefits of small investment, the efficiency of separation.

Technical scheme: the sorting process of the high grey difficult separation coal mud of the present invention, comprise the float coal mud of going into of being furnished with floating agent is fed in the agitator, after the impeller brute force stirs, process the ore pulp that mass percent concentration is 80 g/L～120g/L; The ore pulp for preparing is roughly selected floatation equipment and is carried out sorting from flowing into, and obtains the thick cleaned coal of flotation and roughly selects tail coal; Roughly select tail coal and get into cyclone and carry out classification and concentrate, carry out the underflow product that classification concentrates through cyclone and get into the dehydration of high frequency sieve, the oversize of high frequency sieve dehydration gets into to return after the ball mill fine grinding roughly selects the operation sorting once more of sizing mixing; The screenings of the underflow of cyclone and high frequency sieve is final tail coal; The thick cleaned coal of described flotation fed in the screen-bowl centrifuge dewater, after the screen-bowl centrifuge dehydration, obtain head coal product and cleaned coal and filtrate; Cleaned coal filtrating is fed selected floatation equipment carries out selected; Obtain head coal product and selected tail coal, selected tail coal and ball mill overflow are returned by the road in the lump and are roughly selected the operation of sizing mixing, and carry out sorting once more.

The described floatation equipment of roughly selecting adopts the two-part flotation basin; Described selected floatation equipment adopts flotation column or flotation device.

Beneficial effect: the present invention obtains low ash content, high-recovery floatation clean coal through the method that ore pulp modulation, coal slime flotation equipment are roughly selected, thick cleaned coal dehydration rear filtrate is selected, regrinding and reconcentration is dewatered in the rough coal classification with this.Use flotation column or flotation device to roughly select-thick cleaned coal dehydration rear filtrate is selected-roughly select the efficient sorting that tail coal regrinding and reconcentration sorting process is realized high grey difficult separation coal mud; Not only solved the thin mud of high ash and carried secretly and of the influence of intergrowth mineral, and solved the contradiction between the high grey difficult separation coal mud sorted product quality and the rate of recovery floatation process.Intergrowth mineral and thin mud entrainment problem be can solve simultaneously, the quality of cleaned coal and the rate of recovery improved.Its major advantage:

A, through concentrating classification and dewatering operation; The intergrowth of roughly selecting low ash in the tail coal is separated; Impact in the ball mill between steel ball and abrasive action make to roughly select and connect the health mineral in the tail coal and fully dissociated, and have discharged the cleaned coal in the intergrowth mineral, have improved the floatation clean coal rate of recovery;

B, the high grey particulate filtrating part that will roughly select cleaned coal through screen-bowl centrifuge separate with the dry thing of thick cleaned coal, and high grey fine fraction continuation is selected, and the selected operation of filtrating has reduced the pollution of the thin mud of high ash to cleaned coal;

C, this technological process are reasonable, 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 process flow diagram of the present invention.

Fig. 2 is process flow system figure of the present invention.

Among the figure: 1-goes into float coal mud, 2-floating agent, 3-floatation feed; 4-roughly selects cleaned coal, and 5-roughly selects tail coal, 6-filtrating; The dry thing of the thick cleaned coal of 7-, the selected cleaned coal of 8-, the selected tail coal of 9-; The overflow of 10-cyclone, 11-cyclone underflow, 12-high frequency sieve oversize; 13-high frequency sieve screenings, the overflow of 14-ball mill mill, is roughly selected floatation equipment-C, screen-bowl centrifuge-D, Buffer Pool-E, selected floatation equipment-F, cleaned coal pond-G, cyclone feed pump-H, cyclone-I, high frequency sieve-J, ball mill-K, middle coal Buffer Pool-L, middle coal delivery pump-M, tail coal pond-N at pan feeding pump-A, agitator-B.

The specific embodiment

Below in conjunction with accompanying drawing enforcement of the present invention is done further to describe:

As shown in Figure 1; To go into float coal mud and floating agent is pumped in the agitator by pan feeding; After stirring through the impeller in the agitator; Process the ore pulp that mass percent concentration is 80 g/L～120g/L, let the ore pulp for preparing feed and roughly select in the floatation equipment, roughly select floatation equipment and adopt the two-part flotation basin through the passage gravity flow.After the two-part flotation basin is roughly selected; Let the isolated cleaned coal of roughly selecting carry out the cleaned coal dewatering operation in the screen-bowl centrifuge from flowing into; Obtain filtrating and the dry thing of thick cleaned coal, filtrating gets into selected floatation equipment and carries out selected operation, and selected floatation equipment adopts flotation column or flotation device.Dry thing of thick cleaned coal and the cleaned coal chosen through flotation column or flotation device are as final cleaned coal; Roughly selecting in the tail coal entering cyclone after the two-part flotation basin is roughly selected concentrates classification; The underflow of cyclone gets into the high frequency sieve and dewaters; The oversize of high frequency sieve gets into ball mill and carries out grinding operation; The pulp density of ball mill ore grinding is 35%～40%, and the isolated selected tail coal of product behind the ball mill ball milling and selected floatation equipment gets in the lump sends agitator back to, after sizing mixing, stirring, carries out sorting once more; The screenings of the overflow of cyclone and high frequency sieve gets into the tail coal pond in the lump as final tail coal.

Shown in Figure 2, comprise employing pan feeding pump A, agitator B, roughly select floatation equipment C, screen-bowl centrifuge D, Buffer Pool E, selected floatation equipment F, cleaned coal pond G, cyclone feed pump H, cyclone I, high frequency sieve J, ball mill K, middle coal Buffer Pool L, middle coal delivery pump M, tail coal pond N.To go into float coal mud 1 is sent among the agitator B by pan feeding pump A with floating agent 2; After stirring through the impeller among the agitator B; Process the ore pulp that mass percent concentration is 80 g/L～120g/L, let the floatation feed 3 for preparing feed and roughly select in the floatation equipment C, roughly select floatation equipment C and adopt the two-part flotation basin through pipeline self; The two-part flotation basin is made up of the two-stage flotation post that is cascaded, and the mine tailing of one section flotation of warp feeds two sections again and continues sortings.After the two-part flotation basin is roughly selected; The isolated cleaned coal 4 of roughly selecting carries out the cleaned coal dewatering operation from flowing among the screen-bowl centrifuge D; Obtain filtrating 6 with the dry thing 7 of thick cleaned coal; Filtrating 6 gets into selected floatation equipment F and carries out selected operation, and selected floatation equipment F adopts flotation column or flotation device, is flotation column shown in the accompanying drawing 2.The dry thing 7 of thick cleaned coal gets into cleaned coal pond G as final cleaned coal with the selected cleaned coal 8 that selected floatation equipment F sub-elects; Roughly selecting tail coal 5 is raised to deliver to by cyclone I feed pump H through Buffer Pool E and concentrates classification in the cyclone; Cyclone underflow 11 gets into high frequency sieve J and dewaters; The oversize 12 of high frequency sieve J gets into ball mill K and carries out grinding operation; The pulp density of ball mill K ore grinding is 35%～40%, and overflow 14 and the isolated selected tail coal 9 of selected floatation equipment of ball mill K get into chats Buffer Pool L in the lump, are raised by middle coal delivery pump M and deliver in the agitator B; Sorting once more after sizing mixing, the screenings 13 of cyclone overflow 10 and high frequency sieve gets into tail coal pond N as final tail coal.

Claims

1. the sorting process of a high grey difficult separation coal mud comprises the float coal mud of going into of being furnished with floating agent is fed in the agitator, after the impeller brute force stirs, processes the ore pulp that mass percent concentration is 80 g/L～120g/L; The ore pulp for preparing is roughly selected floatation equipment and is carried out sorting from flowing into, and obtains the thick cleaned coal of flotation and roughly selects tail coal; Roughly selecting tail coal gets into cyclone and carries out classification and concentrate; Carry out the underflow product entering high frequency sieve dehydration that classification concentrates through cyclone; Return after the oversize entering ball mill fine grinding of high frequency sieve dehydration and roughly select the operation sorting once more of sizing mixing, the screenings of the underflow of cyclone and high frequency sieve is final tail coal, it is characterized in that: the thick cleaned coal of described flotation is fed in the screen-bowl centrifuge dewater; After the screen-bowl centrifuge dehydration; Obtain head coal product and cleaned coal filtrating, cleaned coal filtrating is fed selected floatation equipment carry out selectedly, obtain head coal product and selected tail coal; Selected tail coal and ball mill overflow are returned by the road in the lump and are roughly selected the operation of sizing mixing, and carry out sorting once more.

2. the sorting process of the grey difficult separation coal mud of height according to claim 1 is characterized in that: the said floatation equipment of roughly selecting adopts the two-part flotation basin.

3. the sorting process of the grey difficult separation coal mud of height according to claim 1 is characterized in that: said selected floatation equipment adopts flotation column or flotation device.