CN103464272A - Coarse coal slime two-section water medium sorting method - Google Patents
Coarse coal slime two-section water medium sorting method Download PDFInfo
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Abstract
The invention relates to a coarse coal slime two-section water medium sorting method. The method can be used for sorting and recycling of coarse coal slime in desliming and washing, the link of hydraulic classification in conventional coal desliming and washing and currently-popular coarse coal slime sorting is omitted, technological process is simplified, and cost is saved.
Description
Technical field
The invention belongs to the coal preparation technology field, be specifically related to two sections water Jie method for separating of a kind of coarse slime.
Background technology
In coal preparation technology, by the coal washing method can be divided into desliming enter to wash and not desliming enter to wash.The sorting recovery that desliming enters to wash the 2-0.2mm grade coarse slime of generation is the Focal point and difficult point of studying in current coal preparation technology, selects effective screening installation, and formulating rational coarse slime separating process is a current problem urgently to be resolved hurrily.
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 sneaked in the raw coal sizing screen on-the-sieve material and fed together the cyclone that heavily is situated between 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 in classification, make a large amount of thin mud be blended in underflow, reenter the system that heavily is situated between, do not reach raw coal preparation of deslimed raw coal purpose; 2, the system clay content that causes heavily being situated between because the desliming effect is undesirable is high, and this not only affects the system that heavily is situated between and normally moves, and separating effect is descended, 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 main flow is at present, and by the classification undersize material, after the hydraulic classiciation classification, coarse slime is processed with screening installations such as Slime dense medium cyclone or TBS separately.The shortcoming of the first technique is to introduce new heavily Jie system and medium recovery system, makes the coal preparation technique process more complicated, the increase of investment of not only founding the factory, and production management complexity, and medium reclaims 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 sorting precision such as the TBS of coarse slime master screening installation or spiral chutes, and often ash content is higher for the upper cleaned coal of overflow sieve, and underflow exists and runs smart phenomenon, and the economic benefit of separation of coarse slime is undesirable.
Summary of the invention
The objective of the invention is to solve two subject matters that exist in current separation of coarse slime, not high the and coarse slime master screening installation sharpness of separation of classification efficiency is on the low side or subsequent treatment process is complicated.
From solving two problems above-mentioned, the present invention proposes two sections water Jie method for separating of a kind of coarse slime, comprise the following steps:
The first step, raw coal is through sieve aperture 0.75mm～3mm desliming screen classification, and undersize material enters the coal slime bucket, directly is driven into coarse slime master screening installation through pump and carries out sorting; The classifying screen on-the-sieve material feeds main separation and heavily is situated between in cyclone and carries out sorting.
Second step, described coarse slime master screening installation 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 are processed respectively again, and at the Ep that processes the above material of 0.2mm, (value can reach 0.1 to described third hand tap water Jie cyclone separator.
The 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 further to be become low ash extract coal after dehydration and sneaks in cleaned coal, and the centrifugate of centrifuge is returned to the sorting of third hand tap water-only cyclone after entering the 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 is to reclaim the cleaned coal that wherein is less than the 0.2mm grade.When the moisture of cleaned coal requirement is strict, the on-the-sieve material of high-frequency screen can directly not sneaked into cleaned coal yet.The cyclone underflow enters into water Jie screening installation sortings again such as TBS or spiral chute, light product by generations such as TBS or spiral chutes obtains high grey cleaned coal successively after sieve bend, high-frequency screen and coal slime centrifuge, and under the sieve of sieve bend and high-frequency screen, the centrifugate of black water, centrifuge turns back to the coal slime bucket to enter sorting again in third hand tap water Jie cyclone separator.The heavy product produced by TBS or spiral chute etc. is by after the high-frequency screen dehydration, and on-the-sieve material is as middle coal, and undersize material enters into thickener and processes.
The 4th step, under the sieve that the overflow of third hand tap water Jie cyclone separator obtains through sieve bend and high-frequency screen, black water enters into kaskad apparatus for pre-flotation pulp conditioning, enters into flotation device and carries out the cleaned coal that the flotation recovery wherein is less than the 0.2mm grade.Under the sieve that the heavy product of the generations such as flotation tailing and TBS or spiral chute obtains through high-frequency screen, black water enters into after the thickener concentration and carries out filter-press dehydration again and obtain dirty coal mud filter cake.Under the sieve that the light product of the generations such as coal slime centrifuge centrifugate and TBS or spiral chute obtains through sieve bend and high-frequency screen, black water returns and enters the coal slime bucket not because the material gravity flow enters the flotation position, then enters the floatation system sorting by the overflow of third hand tap water-only cyclone.
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; The high-frequency screen screen size is 0.15mm-0.45mm; The 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 pan feeding concentration is lower than 25%; Be less than 0.2mm sized coal cement content lower than 30% in TBS (disturbing bed) and spiral pan feeding.First step explanation: this step has been saved in traditional coarse slime treatment process and current popular coarse slime treatment process and first carried out the step of hydraulic classiciation before coarse slime is carried out sorting or processes, not only avoided the impact on subsequent treatment caused because classification efficiency is not high, and simplified flow process, provide cost savings.
Second step explanation a: step of most critical, coarse slime master screening installation has been 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 processing the above material of 0.2mm, is a kind of efficient separation of coarse slime equipment.Even, when processing the coarse slime of extremely difficult choosing, by changing the size of its conical section cone angle, the ash content that is greater than the 0.2mm grade in its overflow also can reach 8% left and right, thereby obtains up-to-standard cleaned coal.
The 3rd step explanation: whether the overflow of third hand tap water Jie cyclone separator upper cleaned coal of sieve after sieve bend and high-frequency screen dehydration desliming is selected to need to use coal slime centrifuge (or Sedimentation centrifugel) to continue dehydration according to actual conditions; For the underflow of third hand tap water Jie cyclone separator, according to actual conditions, select TBS or spiral chute as underflow water Jie screening installation of sorting again.
The 4th step explanation: this step is mainly that classifying screen (sieve bend and the high-frequency screen) undersize material of the light product that produces of overflow size separation sieve (sieve bend and high-frequency screen) undersize material and the intermediate water Jie screening installation to third hand tap water Jie cyclone separator carries out flotation, to reclaim the fine cleaned coal in the 0.2mm grade that is less than wherein.
Beneficial effect:
1, saved that traditional coal desliming enters to wash and at present popular separation of coarse slime in the link of hydraulic classiciation, simplified technological process, saved cost.
2, selected the main screening installation of third hand tap water Jie cyclone separator as coarse slime.Third hand tap water Jie cyclone separator has the classification and sorting effect, by the thin mud in the following grade of 2-3mm with and distinctive third hand tap corner structure, can carry out effective sorting to the material more than 0.2mm in pan feeding, make the above material of 0.2mm in coarse slime needn't enter again the system sorting that heavily is situated between, be beneficial to management and the normal operation of the system that heavily is situated between, also reduce the load of the system that heavily is situated between, for the raising raw coal enters the amount of washing, stayed leeway.Its sharpness of separation, higher than other water Jie screening installation, can obtain qualified head coal product;
3, the cleaned coal that the third hand tap water-only cyclone sub-elects reclaims separately, has reduced the head coal sculpingscreen load, can improve de-medium effectiveness, reduces dielectric dissipation, reduces production costs;
4, by making underflow enter water Jie screening installations such as TBS or spiral chute, obtained again high grey cleaned coal from underflow, the low ash extract coal that this height ash cleaned coal can sieve with overflow size separation on (sieve bend and high-frequency screen) sieve is mixed to get the cleaned coal that ash content is qualified, has further improved coal preparation plant's economic benefit.
5, third hand tap water-only cyclone recovery coarse slime technique is simple, arrangement convenience.Technical cost is low, and system forms, is more suitable for the old coal preparation plant technological transformation of technology arrangement compactness.
6, introduce (sieve bend and the high-frequency screen) classification of overflow size separation sieve in technique, the technique of flotation again under sieve, the gravity treatment cost is low, flotation is processed the low advantage of granularity lower limit and is combined, and has fully reclaimed the cleaned coal in the coarse slime, has improved to greatest extent economic benefit.
7, two sections sortings can reduce cleaned coal content in thick middle coal slime to greatest extent, to improve clean coal recovery, are guaranteeing under the cleans ash prerequisite, and the maximum cleaned coal that reclaims, be that limited coal resources are rationally utilized, and improves Business Economic Benefit simultaneously.
The 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.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.
By finding out two sections water Jie method for separating of a kind of coarse slime in Fig. 1, it is characterized in that comprising the following steps:
The first step, raw coal is through sieve aperture 0.75mm～3mm desliming screen classification, and undersize material enters the coal slime bucket, directly is driven into main screening installation through pump and carries out sorting; The classifying screen on-the-sieve material feeds main separation and heavily is situated between in cyclone and carries out sorting.
Second step, coarse slime master screening installation is selected 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 are processed respectively again, and described third hand tap water Jie cyclone separator can reach 0.1 in the possible deviation Ep value of processing the above material of 0.2mm.
The 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 further after dehydration, sneaks into cleaned coal (i.e. the part of centrifugal dehydration in figure), and the centrifugate of centrifuge is returned to the sorting of third hand tap water-only cyclone after entering the 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 is to reclaim the cleaned coal that wherein is less than the 0.2mm grade.When the moisture of cleaned coal requirement is strict, the on-the-sieve material of high-frequency screen can directly not sneaked into cleaned coal yet.The cyclone underflow enters into water Jie screening installation sortings again such as TBS or spiral chute, light product by generations such as TBS or spiral chutes obtains coal in high ash 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 wherein is less than the cleaned coal of 0.2mm grade to carry out the flotation recovery; The centrifugate of centrifuge turns back to the coal slime bucket to enter sorting again in third hand tap water Jie cyclone separator.The heavy product produced by TBS or spiral chute etc. is by after the high-frequency screen dehydration, and on-the-sieve material is as coal in high ash, and undersize material enters into thickener and processes.
The 4th step, under the sieve that under the sieve that the overflow of third hand tap water Jie cyclone separator obtains through sieve bend and high-frequency screen, the light product of black water and the generations such as TBS or spiral chute 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 is processed, enter into the flotation device flotation and reclaim the cleaned coal that wherein is less than the 0.2mm grade.Under the sieve that the heavy product of the generations such as flotation tailing and TBS or spiral chute obtains through high-frequency screen, black water enters into after the thickener processed and carries out filter-press dehydration again and obtain dirty coal mud filter cake.
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; The high-frequency screen screen size is 0.15mm-0.45mm; The 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 pan feeding concentration is lower than 25%; In TBS (disturb bed) and spiral pan feeding-0.2mm content is lower than 30%.
Should be understood that these embodiment only are not used in and limit the scope of the invention for the present invention is described.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (4)
1. two sections water Jie method for separating of a coarse slime is characterized in that comprising the following steps:
The first step, raw coal is through sieve aperture 0.75mm～3mm desliming screen classification, and undersize material enters the coal slime bucket, directly is driven into coarse slime master screening installation through pump and carries out sorting; The classifying screen on-the-sieve material feeds main separation and heavily is situated between in cyclone and carries out sorting;
Second step, described coarse slime master screening installation 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 are processed respectively again, and at the Ep that processes the above material of 0.2mm, (value can reach 0.1 to described third hand tap water Jie cyclone separator;
The 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 further to be become low ash extract coal after dehydration and sneaks in cleaned coal, and the centrifugate of centrifuge is returned to the sorting of third hand tap water-only cyclone after entering the 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 is to reclaim the cleaned coal that wherein is less than the 0.2mm grade; When the moisture of cleaned coal requirement is strict, the on-the-sieve material of high-frequency screen can directly not sneaked into cleaned coal yet, the cyclone underflow enters into water Jie screening installation sortings again such as TBS or spiral chute, light product by generations such as TBS or spiral chutes obtains high grey cleaned coal successively after sieve bend, high-frequency screen and coal slime centrifuge, and under the sieve of sieve bend and high-frequency screen, the centrifugate of black water, centrifuge turns back to the coal slime bucket to enter sorting again in third hand tap water Jie cyclone separator; The heavy product produced by TBS or spiral chute etc. is by after the high-frequency screen dehydration, and on-the-sieve material is as middle coal, and undersize material enters into thickener and processes;
The 4th step, under the sieve that the overflow of third hand tap water Jie cyclone separator obtains through sieve bend and high-frequency screen, black water enters into kaskad apparatus for pre-flotation pulp conditioning, enters into flotation device and carries out the cleaned coal that the flotation recovery wherein is less than the 0.2mm grade; Under the sieve that the heavy product of the generations such as flotation tailing and TBS or spiral chute obtains through high-frequency screen, black water enters into after the thickener concentration and carries out filter-press dehydration again and obtain dirty coal mud filter cake, under the sieve that the light product of the generations such as coal slime centrifuge centrifugate and TBS or spiral chute obtains through sieve bend and high-frequency screen, black water returns and enters the coal slime bucket not because the material gravity flow enters the flotation position, then enters the floatation system sorting by the overflow of third hand tap water-only cyclone.
2. two sections water Jie method for separating of a kind of coarse slime as claimed in claim 1, 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. two sections water Jie method for separating of a kind of coarse slime as claimed in claim 1, is characterized in that described sieve bend screen size is 0.3mm-0.7mm; The high-frequency screen screen size is 0.15mm-0.45mm; The coal slime centrifuge mesh size is 0.20-0.45mm.
4. two sections water Jie method for separating of a kind of coarse slime as claimed in claim 1, is characterized in that 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 pan feeding concentration is lower than 25%; Be less than 0.2mm sized coal cement content lower than 30% in TBS (disturbing bed) and spiral pan feeding.
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| CN111635035A (en) * | 2020-06-09 | 2020-09-08 | 欧战备 | Coking coal tailing slurry treatment method and dosing device thereof |
| CN111635035B (en) * | 2020-06-09 | 2022-04-26 | 欧战备 | Coking coal tailing slurry treatment method and dosing device thereof |
| CN112371324A (en) * | 2020-09-21 | 2021-02-19 | 新汶矿业集团有限责任公司洗煤分公司 | Efficient coarse slime separation process |
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