CN103028486A - High and medium density coarse slime separation process - Google Patents

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 thing 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 thing coarse slime between especially a kind of senior middle school that is applicable to separation of coarse slime operation in the 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 granularity close to coal slime, and more than 0.5mm, the granularity upper limit should not adopt the Bed for Fine Coal of flotation processing about about 2mm usually.In recent years, because the development of coal in China cause, coal preparation technique has progressively replaced on the basis of jigging machine at the cyclone that heavily is situated between constantly perfect, 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, is presented as that the coarse slime ash content of coal preparation plant's recovery is higher, if this part coarse slime mixes cleaned coal, can cause gravity treatment back of the body ash; If mix middle coal, then cause the waste of resource.Simultaneously, in coal preparation plant's coal slime floating process, run thick for fear of tail coal, that suitably reduces artificially flotation operation enters the float coal mud pellet degree upper limit, can reach higher clean coal recovery, and then cause this part coarse slime between the effective lower limit of separation of the cyclone that heavily is situated between and the effective sorting upper limit of flotation to 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 both be carried out slight sorting to it, and its sorting often carries no weight.When originally requiring cleans ash higher and not strict, cleaned coal is directly mixed in general not sorting of coarse slime.Along with improving constantly that quality of cleaned coal is required, coarse slime can not all mix cleaned coal, and factory begins to adopt separation of coarse slime equipment in order to improve the quality of products.

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 is to carry out sorting according to the difference of the density feature of coal, except Slime dense medium cyclone adds magnetite powder as the medium solid, other all be with autogenous medium or aqueous medium as separating medium, sharpness of separation is generally lower.And Slime dense medium cyclone more problem occurs owing to being subjected to the dense media master to divide the impact of selections larger in the assorting room, and the Slime dense medium cyclone many places in many coal preparation plants are in dead status.Therefore, present stage the coarse slime of coal preparation plant's separation of coarse slime mainly be for easy coal separation mud since near its separating density to close on the density thing less, even if the not high screening installation of sharpness of separation also can reach preferably separating effect.But the high difficulty of middle density thing content is selected coarse slime, because organic flammable body and inorganic mineral intergrowth are many, the output of intermediate density thing is large, ash content is higher, existing screening installation is limited by the sharpness of separation restriction, can't solve density thing difficulty between senior middle school and select the contradiction between the product quality and the rate of recovery in the separation of coarse slime, be a great problem in the 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, in interference bed separation equipment, introduce bubble, 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 the intermediate density intergrowth do not separate, all there is certain impact in ash content and the flammable body rate of recovery of fluid bed cleaned coal.

Summary of the invention

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

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

Beneficial effect: the practical technique that the present invention is based on density thing separation of coarse slime between senior middle school, the high density section of use hindered bed separator or two product spirals density thing coarse slime between senior middle school is carried out sorting and is guaranteed the flammable body rate of recovery, again through the coal-grinding operation make the levigate and partial solution of the relatively high intergrowth of roughly selecting organic flammable body in the cleaned coal and inorganic mineral of ash content from, enter again the flotation operation link and carry out sorting, slough the inorganic mineral that dissociates in the intergrowth, reclaim organic flammable body wherein, not only guaranteed quality of cleaned coal but also improved the flammable body rate of recovery.First for density thing 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 flotation column flotation realizes the efficient separation of density thing coarse slime between senior middle school.Compare with traditional coarse slime separating process, the efficiency of separation is high, remarkable in economical benefits; Have following advantage:

A. by hindered bed separator or two product spirals density thing coarse slime between senior middle school is carried out sorting in the high density section, under the prerequisite that guarantees the tail coal quality, can have more cleaned coal, improve the flammable body rate of recovery, final quality of cleaned coal is guaranteed by coal-grinding-flotation operation;

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

When c. being conducive to the reduction of final products cleans ash, can improve the rate of recovery of flammable body.Can upgrade on the basis of existing traditional handicraft and transform.Its technological process is simple, small investment, and power consumption is little, and operating cost is low.

Description of drawings

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

Among the figure: 1-is selected in coarse slime; 2-coarse slime tail coal; The 3-coarse slime is roughly selected cleaned coal; Black water under the 4-sieve bend; 5-thickener overflow circulating water; 6-thickener underflow black water; Roughly select cleaned coal on the 7-sieve bend; Roughly select cleaned coal after 8-is levigate; The 9-floating agent; The 10-flotation is selected in coal slime; The 11-floatation clean coal; The 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, slag stock pump one F, ball mill G, buffer barrel H, slag stock 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.

The specific embodiment

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

As shown in Figure 1, density thing 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, slag stock pump one F, ball mill G, buffer barrel H, slag stock 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 between senior middle school of the present invention.At first will feed from the selected coarse slime 1 of gravity separation operation or graded operation among hindered bed separator or the two product spiral A and carry out separation operation, obtain the qualified coarse slime tail coal 2 of high density product and the low density products coarse slime is roughly selected 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; Coarse slime is roughly selected cleaned coal 3 gravity flow and is entered sieve bend C and carry out dewatering operation, obtains roughly selecting cleaned coal 7 on the lower black water 4 of sieve bend sieve and the sieve bend; The lower black water 4 of sieve bend sieve enters coal slime thickener D and concentrates, and obtains thickener overflow circulating water 5 and underflow black water 6, and overflow circulating water 5 enters circulating water pool E, and underflow black water 6 uses slag stock pump one F to raise and delivers to flowsheet of slurry agitation bucket J; Roughly select cleaned coal 7 on the sieve bend and feed ball mill F and carry out coal-grinding, obtain roughly selecting cleaned coal 8 after levigate, flow into buffer barrel H, raise with slag stock 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 stirs the operation of sizing mixing, finishing selected coal slime 10 gravity flows of flotation after sizing mixing enters among flotation device or the flotation column K and carries out sorting, the froth pulp floatation clean coal 11 that finally obtains enters floatation clean coal bucket M, and the floating tail-coal 12 of afterbody discharge enters floating tail-coal bucket L.

Claims (1)

1. density thing coarse slime separating process between a senior middle school comprises selected coarse slime (1) being fed hindered bed separator or two product spirals are roughly selected, and obtains qualified coarse slime tail coal (2) and coarse slime and roughly selects cleaned coal (3); It is characterized in that: described coarse slime is roughly selected cleaned coal, and (30 feed sieve bend (C) dewaters and graded operation, obtain roughly selecting on black water under the sieve bend (4) and the sieve bend cleaned coal (7), black water under the sieve bend (4) enters coal slime thickener (D) and concentrates operation, obtain thickener underflow black water (6) and thickener overflow circulating water (5), overflow circulating water (5) enters circulating water pool (E), feed ball mill (G) and carry out coal-grinding roughly selecting cleaned coal (7) on the sieve bend, through dissociating, obtain after levigate roughly selecting cleaned coal (8) after levigate, the cleaned coal (8) of roughly selecting after levigate together feeds flowsheet of slurry agitation bucket (J) with thickener underflow black water (6), ratio adds and to feed flotation device after floating agent (9) is sized mixing or flotation column carries out sorting (K) routinely, obtains floatation clean coal product and floating tail-coal product.