CN103028486B

CN103028486B - High and medium density coarse slime separation process

Info

Publication number: CN103028486B
Application number: CN201210560813.7A
Authority: CN
Inventors: 何亚群; 付汝三; 张夏
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2015-03-04
Anticipated expiration: 2032-12-21
Also published as: CN103028486A

Abstract

The invention discloses a high and medium density coarse slime separation process, which comprises the following steps of: firstly feeding selected coarse slime into coarse slime separation equipment for coarse separation to obtain a qualified coarse slime tailing product and coarse slime roughened clean coal; feeding the roughened clean coal in a sieve bend to dehydrate and grade so as to obtain roughed clean coal on the sieve bend and slime water below the sieve bend; feeding the slime water below the sieve bend into a slime concentrator for concentration; lifting and feeding an underflow of the concentrator into a stirring drum by using a slurry pump; feeding the roughed clean coal on the sieve bend into a ball mill to perform ground coal separation; feeding ground roughened clean coal into a buffer drum; lifting and feeding into the stirring drum by using the slurry pump; stirring the ground roughened clean coal and the underflow of the concentrator in the stirring drum; and adding a floatation reagent to prepare slurry and then feeding into a flotation machine or a flotation column together to perform flotation operation so as to obtain a floated clean coal product and a floated tailing product. The separation process has the advantages of simple process, high separation efficiency, obvious economic benefit and capability of solving the contradiction between the product quality and the recovery rate in refractory coarse slime separation.

Description

Density coarse slime separating process between a kind of senior middle school

technical field

The present invention relates to a kind of slime separation technique, the sorting process of density coarse slime between especially a kind of senior middle school being applicable to separation of coarse slime operation in coal separation process.

Background technology

Coal is the main energy sources of the world today.In China, coal accounts for more than 70% of primary energy, and within the following quite a long time, the principal status of public economy of coal in China's energy resource structure can not change.Coarse slime refers to that granularity is close to coal slime, and usually at more than 0.5mm, upper size boundary, about about 2mm, should not adopt the Bed for Fine Coal of flotation process.In recent years, due to the development of coal in China cause, coal preparation technique, constantly perfect, has progressively replaced on the basis of jigging machine at dense medium cyclone, for increasing treating capacity and the selected upper limit, the diameter of heavy medium cyclone is also in continuous increase, and in this process, effective lower limit of separation of gravity treatment also increases to some extent, be presented as that the coarse slime ash content that coal preparation plant reclaims is higher, if this part coarse slime mixes cleaned coal, gravity treatment can be caused to carry on the back ash; If mix middle coal, then cause the waste of resource.Simultaneously, in coal preparation plant's coal slime floating process, in order to avoid tail coal runs thick, that suitably reduces flotation operation artificially enters the floating slime size upper limit, can reach higher clean coal recovery, and then this part coarse slime that result between the effective lower limit of separation of dense medium cyclone and flotation effective sorting upper limit can not get effective sorting.Because the granularity of coarse slime is between gravity treatment lower limit of separation and the flotation upper limit, gravity treatment and flotation can carry out slight sorting to it, and its sorting often carries no weight.Originally required cleans ash higher and not strict time, the not sorting of general coarse slime directly mixes cleaned coal.Along with improving constantly of requiring quality of cleaned coal, coarse slime all can not mix cleaned coal, and factory, in order to improve the quality of products, starts to adopt separation of coarse slime equipment.

The industrial gravity separation equipment for separation of coarse slime mainly contains: hindered bed separator, Slime dense medium cyclone, water-only cyclone, spiral etc.The grading principle of these equipment mainly carries out sorting according to the difference of the density feature of coal, except Slime dense medium cyclone has additional magnetite powder as except medium solid, other is all that sharpness of separation is generally lower using autogenous medium or aqueous medium as separating medium.And Slime dense medium cyclone is owing to dividing the impact of selections comparatively large by dense media master, occur more problem in assorting room, the Slime dense medium cyclone many places in many coal preparation plants are in dead status.Therefore, present stage coal preparation plant's separation of coarse slime coarse slime mainly for easy coal separation mud, due near its separating density to close on density less, even if the screening installation that sharpness of separation is not high, also can reach good separating effect.But the difficulty high to middle density material content selects coarse slime, due to combustable organic body and inorganic mineral intergrowth many, the output of intermediate density thing is large, ash content is higher, existing screening installation is limited by sharpness of separation restriction, cannot solve density difficulty between senior middle school and select the contradiction in separation of coarse slime between product quality and the rate of recovery, be a great problem in separation of coarse slime technology.Patent publication No. is: CN101402063 discloses based on the coarse slime interference bed separation equipment of gravity and interfacial force and method and application, bubble is introduced in interference bed separation equipment, wish to improve the separating effect to difficult separation coal mud, but, to liquid-solid fluid bed middle introducing gas phase, will exist necessarily with impact the stability of fluid bed, and the inorganic mineral in intermediate density intergrowth is not separated, certain impact is all existed on fluid bed essence pit ash and combustible recovery.

Summary of the invention

Technical problem: the object of the invention is the weak point overcome in prior art, provides that a kind of technique is simple, the efficiency of separation is high, be applicable to density coarse slime separating process between senior middle school.

Technical scheme: density coarse slime separating process between senior middle school of the present invention, comprises and selected coarse slime is fed hindered bed separator or two product spirals are roughly selected, and obtains qualified coarse slime tail coal product and coarse slime roughly selects cleaned coal, described coarse slime is roughly selected cleaned coal to feed sieve bend and carry out dewatering and graded operation, obtain cleaned coal being roughly selected by black water and sieve bend under sieve bend, under sieve bend, black water enters coal slime thickener and carries out concentrated operation, obtain underflow black water and overflow circulating water, overflow circulating water enters circulating water pool, feed ball mill carry out coal-grinding by sieve bend being roughly selected cleaned coal, through dissociating, obtain after levigate levigate after roughly select cleaned coal, after levigate roughly select cleaned coal and thickener underflow black water together feeds flowsheet of slurry agitation bucket, ratio adds and feeds flotation device after floating agent is sized mixing or flotation column carries out sorting routinely, obtain floatation clean coal product and floating tail-coal product.

Beneficial effect: the practical technique that the present invention is based on density separation of coarse slime between senior middle school, use the high density fractions of hindered bed separator or two product spirals density coarse slime between senior middle school to carry out sorting and ensure combustible recovery, the intergrowth roughly selecting combustable organic body in cleaned coal and inorganic mineral making ash content relatively high through coal-grinding operation is again levigate and partial solution from, enter flotation operation link again and carry out sorting, slough the inorganic mineral dissociateed in intergrowth, reclaim combustable organic body wherein, both ensure that quality of cleaned coal turn improved combustible recovery.First for density coarse slime between senior middle school, application of interference bed separator or two product spirals roughly select-and the technique of thick cleaned coal ball mill coal-grinding-flotation device or column flotation to be to realize the efficient separation of density coarse slime between senior middle school.Compared with traditional coarse slime separating process, the efficiency of separation is high, remarkable in economical benefits; Tool has the following advantages:

A. by hindered bed separator or two product spirals, at high density fractions, sorting is carried out to density coarse slime between senior middle school, cleaned coal can be had more under the prerequisite ensureing tail coal quality, improve combustible recovery, final quality of cleaned coal is ensured by coal-grinding-flotation operation;

B. by the impact of the steel ball in ball mill and abrasive action hindered bed separator or two product spirals roughly select obtain roughly select combustable organic body in cleaned coal and inorganic mineral dissociate, levigate, for the enforcement of subsequent job link provides safeguard;

C., while being conducive to the reduction of final products cleans ash, the rate of recovery of flammable body can be improved.Can carry out upgrading and transforming on the basis of existing traditional handicraft.Its technological process is simple, and small investment, power consumption is little, and operating cost is low.

Accompanying drawing explanation

Fig. 1 is screening installation structural representation of the present invention.

In figure: 1-is selected in coarse slime; 2-coarse slime tail coal; 3-coarse slime roughly selects cleaned coal; Black water under 4-sieve bend; 5-thickener overflow recirculated water; 6-thickener underflow black water; Cleaned coal roughly selected by 7-sieve bend; Cleaned coal is roughly selected after 8-is levigate; 9-floating agent; 10-flotation is selected in coal slime; 11-floatation clean coal; 12-floating tail-coal; Hindered bed separator or two product spiral A, coarse slime tail coal bucket B, sieve bend C, coal slime thickener D, circulating water pool E, Pulp pump one F, ball mill G, buffer barrel H, Pulp pump two I, flowsheet of slurry agitation bucket J, flotation device or flotation column K, floating tail-coal pond L, floatation clean coal pond M.

Detailed description of the invention

Below in conjunction with diagram, one embodiment of the present of invention are further described:

As shown in Figure 1, between senior middle school of the present invention, density coarse slime separating process comprises separation of coarse slime device A, coarse slime tail coal bucket B, sieve bend C, coal slime thickener D, circulating water pool E, Pulp pump one F, ball mill G, buffer barrel H, Pulp pump two I, flowsheet of slurry agitation bucket J, flotation device or flotation column K, floating tail-coal pond L, floatation clean coal pond M.First the selected coarse slime 1 from gravity separation operation or graded operation is fed in hindered bed separator or two product spiral A and carry out separation operation, in hindered bed separator or two product spirals, obtain the qualified coarse slime tail coal 2 of high density product and low density products coarse slime roughly selects cleaned coal 3 through roughly selecting, coarse slime tail coal 2 becomes last coarse slime tail coal product through dehydration; Coarse slime is roughly selected cleaned coal 3 gravity flow and is entered sieve bend C and carry out dewatering operation, obtains cleaned coal 7 roughly selected by the lower black water 4 of sieve bend sieve and sieve bend; The lower black water 4 of sieve bend sieve enters coal slime thickener D and concentrates, and obtain thickener overflow recirculated water 5 and underflow black water 6, overflow circulating water 5 enters circulating water pool E, and underflow black water 6 uses Pulp pump one F to raise and delivers to flowsheet of slurry agitation bucket J; Sieve bend is roughly selected cleaned coal 7 to feed ball mill F and carry out coal-grinding, obtain levigate after roughly select cleaned coal 8, flow into buffer barrel H, raise with Pulp pump two I and deliver to flowsheet of slurry agitation bucket J; Thickener underflow 6 and levigate after roughly select cleaned coal 8 in flowsheet of slurry agitation bucket J and the floating agent 9 that adds carry out stirring and to size mixing operation, complete the flotation after sizing mixing to be selected in coal slime 10 gravity flow and to enter in flotation device or flotation column K and carry out sorting, the froth pulp floatation clean coal 11 finally obtained enters floatation clean coal bucket M, and the floating tail-coal 12 of afterbody discharge enters floating tail-coal bucket L.

Claims

1. density coarse slime separating process between a senior middle school, comprise hindered bed separator or two product spiral A), coarse slime tail coal bucket (B), sieve bend (C), coal slime thickener (D), circulating water pool (E), Pulp pump one (F), ball mill (G), buffer barrel (H), Pulp pump two (I), flowsheet of slurry agitation bucket (J), flotation device or flotation column (K), floating tail-coal pond (L), floatation clean coal pond (M), selected coarse slime (1) from gravity separation operation or graded operation is fed in hindered bed separator or two product spirals (A) and carry out separation operation, the qualified coarse slime tail coal (2) of high density product is obtained and coarse slime roughly selects cleaned coal (3) through roughly selecting in hindered bed separator or two product spirals, coarse slime tail coal (2) becomes last coarse slime tail coal product through dehydration, it is characterized in that: described coarse slime is roughly selected cleaned coal (3) and feed sieve bend (C) and carry out dewatering and graded operation, obtain cleaned coal (7) being roughly selected by black water (4) and sieve bend under sieve bend, under sieve bend, black water (4) enters coal slime thickener (D) and carries out concentrated operation, obtain thickener underflow black water (6) and thickener overflow recirculated water (5), overflow circulating water (5) enters circulating water pool (E), and underflow black water (6) uses Pulp pump one (F) to raise and delivers to flowsheet of slurry agitation bucket (J), feed ball mill (G) carry out coal-grinding by sieve bend being roughly selected cleaned coal (7), through dissociating, obtain after levigate levigate after roughly select cleaned coal (8), cleaned coal (8) of roughly selecting after levigate together feeds flowsheet of slurry agitation bucket (J) with thickener underflow black water (6), thickener underflow black water (6) and levigate after cleaned coal (8) of roughly selecting neutralize at flowsheet of slurry agitation bucket (J) floating agent (9) added and carry out stirring and to size mixing operation, complete the flotation after sizing mixing to be selected in coal slime (10) gravity flow and to enter in flotation device or flotation column (K) and carry out sorting, obtain floatation clean coal product and floating tail-coal product, the froth pulp floatation clean coal (11) obtained enters floatation clean coal bucket (M), the floating tail-coal (12) of afterbody discharge enters floating tail-coal bucket (L).