CN103464272B - A kind of coarse slime two sections of water Jie method for separating - Google Patents
A kind of coarse slime two sections of water Jie method for separating Download PDFInfo
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Abstract
The present invention relates to a kind of coarse slime two sections of water Jie method for separating, the method can be used for the sorting recovery that desliming enters to wash middle coarse slime, eliminate traditional coal desliming and enter to wash the link with hydraulic classiciation in separation of coarse slime popular at present, simplify technological process, saved cost.
Description
Technical field
The invention belongs to coal preparation technology field, be specifically related to a kind of coarse slime two sections of water Jie method for separating.
Background technology
In coal preparation technology, desliming can be divided into enter to wash and enter to wash with No severing mud by coal washing method.The sorting recovery that desliming enters to wash the 2-0.2mm grade coarse slime of generation is the Focal point and difficult point studied in current coal preparation technology, and select effective screening installation, formulating rational coarse slime separating process is a problem urgently to be resolved hurrily at present.
Coarse slime separating process flow process in the present invention can be respectively used to the sorting recovery that desliming enters to wash middle coarse slime.
Traditional desliming enters to wash technique, raw coal is after the classification of 1-2mm sieve, undersize material enters hydraulic classification swirler classification again, overflow in hydraulic classification swirler enters slime water system, and underflow is mixed in raw coal sizing screen on-the-sieve material and feeds dense medium cyclone together and carry out sorting after high-frequency screen dehydration.The shortcoming of above-mentioned sorting process is: 1, the graded desliming effect of hydraulic classification swirler is undesirable, because cyclone has obvious inspissation while classification, make a large amount of thin mud be mixed in underflow, reenter Dense-medium system, do not reach raw coal preparation of deslimed raw coal object; 2, cause Dense-medium system clay content high because desliming effect is undesirable, this not only affects Dense-medium system and normally runs, and separating effect is declined, and also affects the working effect of magnetic separator simultaneously, and dense media can not obtain high efficiente callback, and dielectric loss is comparatively serious.
The desliming grade washing technique of current main flow is, by classification undersize material after hydraulic classiciation classification, coarse slime uses separately the process of the screening installation such as Slime dense medium cyclone or TBS.The shortcoming of the first technique is to introduce new Dense-medium system and dielectric film filter system, makes coal preparation technique process more complicated, and investment of not only founding the factory increases, and production management is complicated, and dielectric film filter is more difficult, and the consumption that is situated between increases, and production cost improves.The shortcoming that the second technique exists is not high enough as sharpness of separation such as the TBS of the main screening installation of coarse slime or spiral chutes, and often ash content is higher for the upper cleaned coal of overflow sieve, and underflow exists the phenomenon of running essence, and the economic benefit of separation of coarse slime is undesirable.
Summary of the invention
The object of the invention is to solve two subject matters existed in current separation of coarse slime, namely not high the and coarse slime main screening installation sharpness of separation of classification efficiency is on the low side or subsequent treatment process is complicated.
From solution two problems above-mentioned, the present invention proposes a kind of coarse slime two sections of water Jie method for separating, comprise the following steps:
The first step, raw coal is through the classification of sieve aperture 0.75mm ~ 3mm desliming screen, and undersize material enters coal slime bucket, is directly driven into the main screening installation of coarse slime carries out sorting through pump; Classifying screen on-the-sieve material feeds in main separation dense medium cyclone carries out sorting.
Second step, the main screening installation of described coarse slime is third hand tap water Jie cyclone separator, coarse slime is after the sorting of third hand tap water Jie cyclone separator, and underflow and overflow process respectively again, and at the Ep of process more than 0.2mm material, (value can reach 0.1 to described third hand tap water Jie cyclone separator.
3rd step, the overflow of third hand tap water Jie cyclone separator is successively after sieve bend and high-frequency screen dehydration, and on-the-sieve material enters after coal slime centrifuge dewaters further and is mixed into cleaned coal, returns the sorting of third hand tap water-only cyclone after the centrifugate of centrifuge enters coal slime bucket, after the undersize material of sieve bend and high-frequency screen all enters into kaskad apparatus for pre-flotation pulp conditioning further flotation to reclaim the cleaned coal being wherein less than 0.2mm grade, when moisture of cleaned coal requires not strict, the on-the-sieve material of high-frequency screen also directly can be mixed into cleaned coal, cyclone underflow then enters into TBS or the sorting again of spiral chute water Jie screening installation, the light product produced by TBS or spiral chute is successively through sieve bend, high grey cleaned coal is obtained after high-frequency screen and coal slime centrifuge, under the sieve of sieve bend and high-frequency screen, black water enters into kaskad apparatus for pre-flotation pulp conditioning and reclaims to carry out flotation the cleaned coal being wherein less than 0.2mm grade, the centrifugate of centrifuge then turns back to coal slime bucket to enter sorting again in third hand tap water Jie cyclone separator, and after the heavy product produced by TBS or spiral chute is then dewatered by high-frequency screen, on-the-sieve material is as coal in high ash, and undersize material enters into thickener process,
4th step, under the sieve that the light product that under the sieve that the overflow of third hand tap water Jie cyclone separator obtains through sieve bend and high-frequency screen, black water and TBS or spiral chute produce obtains through sieve bend and high-frequency screen, black water all enters into kaskad apparatus for pre-flotation pulp conditioning, after chemicals treatment, enter into flotation device flotation and reclaim the cleaned coal being wherein less than 0.2mm grade, heavy product black water under the sieve that high-frequency screen obtains of flotation tailing and TBS or spiral chute generation carries out filter-press dehydration again and obtains dirty coal mud filter cake after entering into thickener processed.
In the described first step, raw coal desliming classifying screen sieve aperture is 1-2mm; The diameter of described third hand tap water Jie cyclone separator is 300mm-750mm.
Described sieve bend screen size is 0.3mm-0.7mm; High-frequency screen screen size is 0.15mm-0.45mm; Coal slime centrifuge mesh size is 0.20-0.45mm.
Described low ash extract coal ash content is less than 9%; High grey cleans ash is lower than 13%; Third hand tap water Jie cyclone separator feed thickness is lower than 25%; 0.2mm sized coal cement content is less than lower than 30% in TBS (interference bed) and spiral pan feeding.The first step illustrates: this step eliminates the step of first carrying out hydraulic classiciation in traditional coarse slime treatment process and coarse slime treatment process popular at present before coarse slime carries out sorting or process, not only avoid the impact on subsequent treatment caused because classification efficiency is not high, and simplify flow process, provide cost savings.
Second step illustrates: a step of most critical, the main screening installation of coarse slime have selected third hand tap water Jie cyclone separator, this equipment can carry out effective sorting to the coarse slime of 3-0.2mm grade, through verification experimental verification, third hand tap water Jie cyclone separator can reach 0.1 in the possible deviation Ep value of process more than 0.2mm material, is a kind of separation of coarse slime equipment efficiently.Even if when processing the coarse slime of extremely difficult choosing, by changing the size of its conical section cone angle, the ash content being greater than 0.2mm grade in its overflow also can reach about 8%, thus obtains up-to-standard cleaned coal.
3rd step illustrates: overflow upper cleaned coal of sieve after sieve bend and high-frequency screen dehydration desliming of third hand tap water Jie cyclone separator is selected to continue dehydration the need of use coal slime centrifuge (or Sedimentation centrifugel) according to actual conditions; For the underflow of third hand tap water Jie cyclone separator, select TBS or spiral chute as water Jie screening installation of underflow sorting again according to actual conditions.
4th step illustrates: this step mainly carries out flotation, to reclaim the fine cleaned coal be less than in 0.2mm grade wherein to classifying screen (sieve bend and the high-frequency screen) undersize material of the light product that overflow size separation sieve (sieve bend and high-frequency screen) undersize material and intermediate water Jie screening installation of third hand tap water Jie cyclone separator produce.
Beneficial effect:
1, eliminate traditional coal desliming to enter to wash and the link of hydraulic classiciation in separation of coarse slime popular at present, simplify technological process, saved cost.
2, have selected the main screening installation of third hand tap water Jie cyclone separator as coarse slime.Third hand tap water Jie cyclone separator has classification and sorting effect, by the thin mud in below 2-3mm grade and its distinctive third hand tap corner structure, effective sorting can be carried out to the material of more than 0.2mm in pan feeding, make more than 0.2mm material in coarse slime need not enter Dense-medium system sorting again, be beneficial to the management of Dense-medium system and normal operation, decrease the load of Dense-medium system, leave leeway for raising raw coal enters the amount of washing.Its sharpness of separation, higher than other water Jie screening installation, can obtain qualified head coal product;
3, the cleaned coal that third hand tap water-only cyclone sub-elects reclaims separately, decreases head coal sculpingscreen load, can improve de-medium effectiveness, reduces dielectric dissipation, reduces production cost;
4, by making underflow enter the water such as TBS or spiral chute Jie screening installation, high grey cleaned coal is obtained again from underflow, the low ash extract coal that this high grey cleaned coal can sieve with overflow size separation on (sieve bend and high-frequency screen) sieve is mixed to get the qualified cleaned coal of ash content, further increases coal preparation plant's economic benefit.
5, third hand tap water-only cyclone reclaims coarse slime technique simply, arrangement convenience.Technical cost is low, and system is formed, is more suitable for the old coal preparation plant technological transformation that technology arrangement is compact.
6, (sieve bend and the high-frequency screen) classification of overflow size separation sieve is introduced in technique, the technique of flotation again under sieve, low for gravity treatment cost, that flotation process granularity lower limit is low advantage is combined, has fully reclaimed the cleaned coal in coarse slime, improve economic benefit to greatest extent.
7, two sections of sortings can reduce cleaned coal content in thick middle coal slime to greatest extent, and to improve clean coal recovery, under guarantee cleans ash prerequisite, maximum recovery cleaned coal, is that limited coal resources obtain Appropriate application, improves Business Economic Benefit simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and the embodiments, the present invention is further detailed explanation:
Fig. 1 is process chart of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, set forth the present invention further.
By a kind of coarse slime two sections of water Jie method for separating can be found out in Fig. 1, it is characterized in that comprising the following steps:
The first step, raw coal is through the classification of sieve aperture 0.75mm ~ 3mm desliming screen, and undersize material enters coal slime bucket, is directly driven into main screening installation carries out sorting through pump; Classifying screen on-the-sieve material feeds in main separation dense medium cyclone carries out sorting.
Second step, third hand tap water Jie cyclone separator selected by the main screening installation of coarse slime, coarse slime is after the sorting of third hand tap water Jie cyclone separator, and underflow and overflow process respectively again, and described third hand tap water Jie cyclone separator can reach 0.1 in the possible deviation Ep value of process more than 0.2mm material.
3rd step, the overflow of third hand tap water Jie cyclone separator is successively after sieve bend and high-frequency screen dehydration, on-the-sieve material enters coal slime centrifuge (or Sedimentation centrifugel) and is further mixed into cleaned coal (i.e. the part of centrifugal dehydration in figure) after dehydration, returns the sorting of third hand tap water-only cyclone after the centrifugate of centrifuge enters coal slime bucket; After the undersize material of sieve bend and high-frequency screen all enters into kaskad apparatus for pre-flotation pulp conditioning further flotation to reclaim the cleaned coal being wherein less than 0.2mm grade.When moisture of cleaned coal requires not strict, the on-the-sieve material of high-frequency screen also directly can be mixed into cleaned coal.Cyclone underflow then enters into the sorting again of the water such as TBS or spiral chute Jie screening installation, the light product produced by TBS or spiral chute etc. obtains high grey cleaned coal successively after sieve bend, high-frequency screen and coal slime centrifuge (or Sedimentation centrifugel), and under the sieve of sieve bend and high-frequency screen, black water enters into kaskad apparatus for pre-flotation pulp conditioning and reclaims to carry out flotation the cleaned coal being wherein less than 0.2mm grade; The centrifugate of centrifuge then turns back to coal slime bucket to enter sorting again in third hand tap water Jie cyclone separator.After the heavy product produced by TBS or spiral chute etc. is then dewatered by high-frequency screen, on-the-sieve material is as coal in high ash, and undersize material enters into thickener process.
4th step, under the sieve that the light product that under the sieve that the overflow of third hand tap water Jie cyclone separator obtains through sieve bend and high-frequency screen, black water and TBS or spiral chute etc. produce obtains through sieve bend and high-frequency screen, black water all enters into kaskad apparatus for pre-flotation pulp conditioning, after rational regime of agent process, enter into flotation device flotation and reclaim the cleaned coal being wherein less than 0.2mm grade.Heavy product black water under the sieve that high-frequency screen obtains that flotation tailing and TBS or spiral chute etc. produce carries out filter-press dehydration again and obtains dirty coal mud filter cake after entering into thickener processed.
In the described first step, raw coal desliming classifying screen sieve aperture is 1-2mm; The diameter of described third hand tap water Jie cyclone separator is 300mm-750mm.
Described sieve bend screen size is 0.3mm-0.7mm; High-frequency screen screen size is 0.15mm-0.45mm; Coal slime centrifuge mesh size is 0.20-0.45mm.
Described low ash extract coal ash content is less than 9%; High grey cleans ash is lower than 13%; Third hand tap water Jie cyclone separator feed thickness is lower than 25%; In TBS (interference bed) and spiral pan feeding ,-0.2mm content is lower than 30%.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Claims (3)
1. coarse slime two sections of water Jie method for separating, is characterized in that comprising the following steps:
The first step, raw coal is through the classification of sieve aperture 0.75mm ~ 3mm desliming screen, and undersize material enters coal slime bucket, is directly driven into the main screening installation of coarse slime carries out sorting through pump; Classifying screen on-the-sieve material feeds in main separation dense medium cyclone carries out sorting;
Second step, the main screening installation of described coarse slime is third hand tap water Jie cyclone separator, coarse slime is after the sorting of third hand tap water Jie cyclone separator, and underflow and overflow process respectively again, and described third hand tap water Jie cyclone separator can reach 0.1 in the possible deviation Ep value of process more than 0.2mm material;
3rd step, the overflow of third hand tap water Jie cyclone separator is successively after sieve bend and high-frequency screen dehydration, and on-the-sieve material enters after coal slime centrifuge dewaters further and is mixed into cleaned coal, returns the sorting of third hand tap water-only cyclone after the centrifugate of centrifuge enters coal slime bucket, after the undersize material of sieve bend and high-frequency screen all enters into kaskad apparatus for pre-flotation pulp conditioning further flotation to reclaim the cleaned coal being wherein less than 0.2mm grade, when moisture of cleaned coal requires not strict, the on-the-sieve material of high-frequency screen is directly mixed into cleaned coal, cyclone underflow then enters into TBS or the sorting again of spiral chute water Jie screening installation, the light product produced by TBS or spiral chute is successively through sieve bend, high grey cleaned coal is obtained after high-frequency screen and coal slime centrifuge, under the sieve of sieve bend and high-frequency screen, black water enters into kaskad apparatus for pre-flotation pulp conditioning and reclaims to carry out flotation the cleaned coal being wherein less than 0.2mm grade, the centrifugate of centrifuge then turns back to coal slime bucket to enter sorting again in third hand tap water Jie cyclone separator, and after the heavy product produced by TBS or spiral chute is then dewatered by high-frequency screen, on-the-sieve material is as coal in high ash, and undersize material enters into thickener process,
4th step, under the sieve that the light product that under the sieve that the overflow of third hand tap water Jie cyclone separator obtains through sieve bend and high-frequency screen, black water and TBS or spiral chute produce obtains through sieve bend and high-frequency screen, black water all enters into kaskad apparatus for pre-flotation pulp conditioning, after chemicals treatment, enter into flotation device flotation and reclaim the cleaned coal being wherein less than 0.2mm grade, heavy product black water under the sieve that high-frequency screen obtains of flotation tailing and TBS or spiral chute generation carries out filter-press dehydration again and obtains dirty coal mud filter cake after entering into thickener processed.
2. a kind of coarse slime as claimed in claim 1 two sections of water Jie method for separating, is characterized in that in the described first step, raw coal desliming classifying screen sieve aperture is 1-2mm; The diameter of described third hand tap water Jie cyclone separator is 300mm-750mm.
3. a kind of coarse slime as claimed in claim 1 two sections of water Jie method for separating, is characterized in that described sieve bend screen size is 0.3mm-0.7mm; High-frequency screen screen size is 0.15mm-0.45mm; Coal slime centrifuge mesh size is 0.20-0.45mm.
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