CN102319619A - Graded washing process for raw coal - Google Patents
Graded washing process for raw coal Download PDFInfo
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- CN102319619A CN102319619A CN201110269731A CN201110269731A CN102319619A CN 102319619 A CN102319619 A CN 102319619A CN 201110269731 A CN201110269731 A CN 201110269731A CN 201110269731 A CN201110269731 A CN 201110269731A CN 102319619 A CN102319619 A CN 102319619A
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Abstract
The invention relates a graded washing process for raw coal, which comprises the following steps of: dividing the raw coal into different size fractions according to coal quality: raw coal larger than 80 mm, raw coal from 36 mm to 80 mm and raw coal smaller than 36 mm; sorting different size fractions of raw coal by different sorting devices, sorting the raw coal from 36 mm to 80 mm by a raw coal wash box, and sorting raw coal smaller than 36 mm by a dense medium cyclone. The advantages of the two sorting devices are combined to increase the sorting accuracy of single sorting device, so that the recovery rate of commercial coal is maximized, resource loss and wastage are reduced, the production cost is reduced, expense is saved, consumption is lowered, and meanwhile, the processing ability of the whole set of system is improved.
Description
Technical field
The present invention relates to coal classification and go into to wash technology, particularly high percentage of shale content, easy pulverizing, high ash content Bed for Fine Coal steam coal separation technology how.
Background technology
Coal classification is selected, exactly feed coal is divided into some grades and carries out sorting respectively.Mainly contain two kinds of methods according to the screening installation raw coal separation: dense medium separation and jigging.At the assorting room that heavily is situated between, no matter adopt which kind of dense media, all have certain viscosity, the caused drag effect of suspension viscosity is inequality to varigrained particle, this species diversity is very significant sometimes.Therefore, sink float generally adopts the preparation of sized raw coal mode.Generally the lump coal greater than 13mm adopts the method for separating that heavily is situated between, and adopts heavily be situated between cyclone or jigging less than the smalls of 13mm, for thermal coal coal preparation plant, and smalls even can directly sell as marketable coal.
The extremely difficult branch coal separation high for percentage of shale content at present, that ash content is high; Generally adopt two section two product cyclone that heavily is situated between to have and press the feed sorting process; But pulverize because of the raw coal percentage of shale content is high, easy; This technology be prone to produce a large amount of secondary slimes when having improved sharpness of separation, cause that slime content is big, the situation of resource loss.In the existing screening installation, the jigging machine sorting upper limit can reach 80mm, and the secondary slime amount is little, and production cost is low, but low to the Bed for Fine Coal sharpness of separation, separating effect is poor; The dual medium cyclone dressing precision is high, but ton coal processing charges is high, and equipment is many, and energy consumption is high, and the degree of wear is big, and technology arrangement is complicated, and the secondary slime amount is big.High for the raw coal percentage of shale content, as to be prone to pulverizing steam coal separation technology, two kinds of technologies all can't reach optimum target.
CN1883812A (CN200610045415.6) discloses a kind of raw coal sorting process, comprises the steps: to utilize classifying screen that raw coal is carried out classification; The output of gained screenings, oversize get into jigging machine and wash sorting; The water that gained spoil, middle coal are exported respectively, gained piece cleaned coal gets into after cleaned coal classification dewatering screen, the sorting gets into dark awl concentration basin; The output of gained bulk cleaned coal, gained fritter cleaned coal get into centrifugal drier, backwater gets into dark awl concentration basin; The output of gained fritter cleaned coal, centrifugate get into dark awl concentration basin; Underflow after dark awl concentration basin concentrates gets into cyclone; The underflow of cyclone gets into the high frequency sieve, overflowing liquid gets into pipe chute thickener; The oversize of high frequency sieve gets into centrifugal drier, backwater gets into dark awl concentration basin; The overflowing liquid of dark awl concentration basin gets into pipe chute thickener; The overflowing liquid of pipe chute thickener gets into circulating water pool; Underflow after concentrating gets into belt filter press; The output of gained coal slime, the gained filtrate water gets into circulating water pool.To consume energy this technique process complicacy, equipment big more, thereby its commercial Application is restricted.
Summary of the invention
To the deficiency of prior art, the present invention provides a kind of coal classification to go into to wash technology.
The term explanation
Coal classification: according to the raw coal ature of coal, change under the situation greatly in size fractionated raw coal ature of coal, raw coal is carried out prescreening, different grades gets into different sorting process, guarantees that the raw coal of size fractionated obtains best separating effect.
+ 80mm raw coal: greater than the raw coal of 80mm granularity.
-36mm raw coal: less than the raw coal of 36mm granularity; Equally ,-13mm is the coal less than the 13mm granularity.
The raw coal of 36-80mm: granularity is at the raw coal of 36-80mm.
De-mediated: be meant the heavy suspension medium.
Medium: refer to the heavy suspension medium.
Close the bucket that is situated between: the bucket that refers to adorn qualified medium.
Technical scheme of the present invention is following:
A kind of coal classification goes into to wash technology, comprises the steps:
Raw coal carries out classification through going into to wash belt entering classifying screen; Tell the product of three kinds of grades, be respectively: greater than the raw coal of 80mm, the raw coal of 36-80mm is less than the raw coal of 36mm;
Gained is got into the picking operation greater than the raw coal of 80mm, get rid of coal cinder behind the spoil and send into crusher in crushing to granularity and send into the cyclone that heavily is situated between less than 36mm and carry out sorting;
The raw coal of the 36-80mm of gained is got into jigging machine wash sorting; The spoil of gained, lump coal are exported respectively after the jigging machine sorting;
Getting into the cyclone that heavily is situated between less than the raw coal of 36mm and carry out sorting gained;
Heavy suspension medium in described heavy Jie's cyclone effectively separates bastard coal, the head piece discharge of the spoil stream after the sorting from the bottom, and mixed coal stream is discharged from overfall; The spoil stream and the mixed coal flow point of discharging do not get into separately de-mediated, dehydration procedure, and the heavy suspension medium is carried out recycling.
Preferred according to the present invention, the heavy suspension medium in said heavy Jie's cyclone is a magnetite powder, and the magnetic thing is Fe
2O
3,Content>=98wt% is less than 325 mesh content>=85%.
Preferred according to the present invention, the coal less than 36mm that fragmentation obtains is sneaked into the raw coal less than 36mm that obtains of screening and is got into the cyclone that heavily is situated between together and carry out sorting.
De-mediated, the dehydration procedure of spoil stream according to the invention, mixed coal stream can be with reference to prior aries.
Preferred according to the present invention, de-mediated, the dehydration procedure operating procedure of said spoil stream, mixed coal stream are following:
1, spoil stream and mixed coal flow point are not carried out a de-mediated through separately de-mediated sieve bend; Sieve medium down is a qualified medium; The bucket circulation that is situated between is closed in entering; The oversize material gets into straight-line oscillation dehydration sculping screen and carries out secondary de-mediated and dehydration, and wherein medium is a qualified medium under the preceding 1/3 section sieve of straight-line oscillation dehydration sculping screen, gets into and closes the bucket circulation that is situated between; The back adds for 2/3 section and sprays water with high pressure, and sieve medium down is rare medium, after magnetic separator reclaims, gets into and closes the bucket that is situated between.
2, material is the spoil product on the straight-line oscillation dehydration sculping screen of spoil stream, gets into spoil transportation system; Material entering mixed coal centrifugal dehydrator carries out second dehydration on the straight line dehydration de-mediated vibratory sieve of mixed coal stream, and dehydration back material is the mixed coal product, gets into mixed coal transportation system.
Main separation equipment is respectively jigging machine, heavily be situated between cyclone and raw coal sizing screen in the technology of the present invention, wherein, and preferred following equipment:
Said jigging machine is selected DMST-6 one hop count control jigging machine for use.This jigging machine is for the following air chamber type of sieve, and with respect to sieve side air chamber type, it is even to have a pulse pneumatic, and bed is uniformly dispersed, the advantage of good separation effect.Air-valve adopts air-operated solenoid valve, regulates easyly, is furnished with the numerical control case, and parameter regulation is in time easy, and automaticity is higher than hand-operated jig.
Said heavy Jie's cyclone is two product cyclones, selects the FXJ1000 type for use, and underflow tap diameter does
The specified disposal ability of this cyclone is 220-270t/h, and the actual treatment amount can reach 320t/h; The medium circulation amount is 1100m
3It is big to have disposal ability, and the efficiency of separation is high, the advantage that sharpness of separation is high.
Said raw coal sizing screen is selected BRU-2-240/610 type classifying screen for use, and this classifying screen is double-deck circular shale shaker, adopts the vibrator mode of vibration, and compass screen surface is done elliptical motion, has increased the grading time of material, makes the abundant classification of material.The sorting separately of+80mm grade bulk raw coal, the 36-80mm raw coal gets into the jigging machine sorting, and-36mm raw coal gets into dual medium cyclone dressing.
Above equipment is all commercially available.All the other used equipment also are the commercially available prod.
Technology of the present invention is particularly suitable for high percentage of shale content, is prone to the sorting of pulverizing, high ash content Bed for Fine Coal.Described high percentage of shale content is meant more than the percentage of shale content 50wt%, and high ash content is meant more than the content of ashes 55wt%, Bed for Fine Coal be meant granularity less than the productive rate of 36mm at the raw coal more than 55%, refer in particular to granularity less than the productive rate of 15mm at the raw coal more than 50%.
Coal classification of the present invention is selected in technology, utilizes the feature performance benefit of distinct device, carries out sorting with getting into different sorting process behind the coal classification.The advantage that performance jigging machine sorting lump coal precision is high, production cost is low, with lump coal with the sorting of jigging technology; High, the effective prerequisite of performance dual medium cyclone dressing Bed for Fine Coal precision is with the technology graded shot coal that heavily is situated between.Two kinds of technologies combine, and have reduced spoil effectively and have contained the coal amount, have reduced coal slime output simultaneously, have reduced the wasting of resources and loss.It is high to the lump coal separation precision that the present invention takes all factors into consideration jigging machine, good separation effect, and technology arrangement is simple; The advantage that production cost is low, low in conjunction with the dual medium cyclone dressing lower limit, the characteristics that sharpness of separation is high; Coal classification is gone into to wash, make each grade raw coal in assorting room, reach best separating effect, reduced spoil and contained the coal amount; Avoid the wasting of resources and loss, guaranteed maximum recovery.
After the present invention implemented, jigging machine sorting lump coal was higher because of calorific value, sold as independent product; Price is higher 150 yuan/ton than common coal, simultaneously, has also reduced the production pressure of the system that heavily is situated between; Reduce production cost, and improved the quality and the rate of recovery of last marketable coal, had huge economic benefit.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Invention further specifies to present technique below in conjunction with instance.But be not limited thereto.
Jigging machine: DMST-6 one hop count control jigging machine, clean border, Tangshan energy company product.
Cyclone heavily is situated between: two product cyclones, FXJ1000 type, sea, Weihai king's cyclone Company products.
Raw coal sizing screen: BRU-2-240/610 type classifying screen, the lucky full mining industry equipment Co., Ltd of match product.
Raw coal: Shandong official Zhao Xin Kuang energy Co., Ltd produces, percentage of shale content: 53.4%, and ash content: 57.36%, granularity :-13mm productive rate is 58.43%.
Embodiment 1:
Raw coal sizing screen adopts the circular vibration mode, and two-layer sieve plate, ground floor are square-netting screen, and the sieve seam is 80mm, with productive rate have only 6%+the 80mm raw coal tells, and gets into picking; The second layer is a round-hole punched plate, and sieve seam is 36mm, is that 23.5% 36-80mm raw coal is told with productive rate, gets into the jigging machine sorting, produces high heating value lump coal;-36mm raw coal productive rate is 70.5%, and wherein ,-13mm productive rate is 58.43%, passes through the sieve back and gets into the smalls belt, is transported to the raw coal deposit storehouse that heavily is situated between, and gets into the system's sorting that heavily is situated between.
Jigging machine has independent air feed system and digital control system for air chamber type under the sieve.
The cyclone that heavily is situated between is two product cyclones, and heavy product is discharged from underflow opening, and light product is discharged from overfall.Two kinds of products all have separately de-mediated, dehydration procedure, and the medium recovery system is arranged.
The course of work is following:
Raw coal gets into raw coal sizing screen and carries out pre-classification through going into to wash belt, tells the product of three kinds of grades, is respectively: greater than 80mm (+80mm) raw coal, the raw coal of 36-80mm is less than 36mm (raw coal 36mm); + 80mm is less because of content, gets into picking, gets into crusher in crushing to granularity less than 36mm after getting rid of spoil, sneak into-raw coal of 36mm gets into the cyclone that heavily is situated between in the lump and carries out effective sorting; The 36-80mm raw coal gets into the jigging machine sorting, and precision is high when mainly bringing into play jigging machine sorting lump coal, the advantage that production cost is low;-36mm raw coal gets into dual medium cyclone dressing, in the cyclone that heavily is situated between the heavy suspension that configures is housed, and the heavy suspension medium is a magnetite powder, and the magnetic thing is Fe
2O
3,Content>=98wt% is less than 325 mesh content>=85%.The heavy suspension medium makes coal effectively separate with spoil, and underflow is discharged spoil, overflow row coal.
Spoil stream and mixed coal flow point are not carried out a de-mediated through separately de-mediated sieve bend (Haixing County, development zone, Hengshui filter material factory is on sale); Sieve medium down is a qualified medium; The bucket circulation that is situated between is closed in entering; The oversize material gets into separately straight-line oscillation dehydration sculping screen (the prosperous good cleaning unit in Tengzhou City Co., Ltd is on sale) respectively and carries out secondary de-mediated and dehydration, and wherein medium is a qualified medium under the preceding 1/3 section sieve of straight-line oscillation dehydration sculping screen, gets into and closes the bucket circulation that is situated between; The back adds for 2/3 section and sprays water with high pressure, and sieve medium down is rare medium, after magnetic separator reclaims, gets into and closes the bucket that is situated between.Material is the spoil product on the straight-line oscillation dehydration sculping screen of spoil stream, gets into spoil transportation system; Material entering mixed coal centrifugal dehydrator carries out second dehydration on the mixed coal stream straight line dehydration de-mediated vibratory sieve, and dehydration back material is the mixed coal product, gets into mixed coal transportation system.
Effect:
Coal preparation plant of official Zhao energy company carries out application experiment to technology of the present invention in Dezhou, Shandong, and accumulative total is produced ton surplus the medium sized coal 9000, and income from sales increases by 1,350,000 yuan; The spoil calorific value reduces by 200 kilocalories, amounts to and reclaims totally ton surplus in the of 20,000 of marketable coal, and income from sales increases by 1,500,000 yuan; The coal slime productive rate reduces by 2.62%, and promptly the marketable coal rate of recovery increases by 2.62%, and income from sales increases by 700,000 yuan.
This technology is after the The field experiment; The jigging system and heavily Jie system produce pressure and all alleviate to some extent; Main separation equipment and corollary equipment disposal ability all have more than needed; Make mine hoisting production capacity 1.8Mt/a, the disposal ability of coal separation system can be mated the above hoisting power of 2.0Mt/a, lays a good foundation for mine improves production capacity.
Claims (4)
1. a coal classification goes into to wash technology, comprises the steps:
Raw coal carries out classification through going into to wash belt entering classifying screen; Tell the product of three kinds of grades, be respectively: greater than the raw coal of 80mm, the raw coal of 36-80mm is less than the raw coal of 36mm;
Gained is got into the picking operation greater than the raw coal of 80mm, get rid of coal cinder behind the spoil and send into crusher in crushing to granularity and send into the cyclone that heavily is situated between less than 36mm and carry out sorting;
The raw coal of the 36-80mm of gained is got into jigging machine wash sorting; The spoil of gained, lump coal are exported respectively after the jigging machine sorting;
Getting into the cyclone that heavily is situated between less than the raw coal of 36mm and carry out sorting gained;
Heavy suspension medium in described heavy Jie's cyclone effectively separates bastard coal, the head piece discharge of the spoil stream after the sorting from the bottom, and mixed coal stream is discharged from overfall; The spoil stream and the mixed coal flow point of discharging do not get into separately de-mediated, dehydration procedure, and the heavy suspension medium is carried out recycling.
2. coal classification as claimed in claim 1 goes into to wash technology, it is characterized in that the coal less than 36mm that fragmentation obtains sneaks into the raw coal less than 36mm that screening obtains and get into the cyclone that heavily is situated between together and carry out sorting.
3. coal classification as claimed in claim 1 goes into to wash technology, it is characterized in that de-mediated, the dehydration procedure operating procedure of said spoil stream, mixed coal stream is following:
(1) spoil stream and mixed coal flow point are not carried out a de-mediated through separately de-mediated sieve bend; Sieve medium down is a qualified medium; The bucket circulation that is situated between is closed in entering; The oversize material gets into straight-line oscillation dehydration sculping screen and carries out secondary de-mediated and dehydration, and wherein medium is a qualified medium under the preceding 1/3 section sieve of straight-line oscillation dehydration sculping screen, gets into and closes the bucket circulation that is situated between; The back adds for 2/3 section and sprays water with high pressure, and sieve medium down is rare medium, after magnetic separator reclaims, gets into and closes the bucket that is situated between;
(2) material is the spoil product on the straight-line oscillation dehydration sculping screen of spoil stream, gets into spoil transportation system; Material entering mixed coal centrifugal dehydrator carries out second dehydration on the straight line dehydration de-mediated vibratory sieve of mixed coal stream, and dehydration back material is the mixed coal product, gets into mixed coal transportation system.
4. coal classification as claimed in claim 1 goes into to wash technology, it is characterized in that the heavy suspension medium in said heavy Jie's cyclone is a magnetite powder, and the magnetic thing is Fe
2O
3,Content>=98wt% is less than 325 mesh content>=85%.
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Cited By (10)
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| CN103639032A (en) * | 2013-12-25 | 2014-03-19 | 河南神火煤业公司刘河选煤厂 | Centralized large lump coal crushing process |
| CN104549709A (en) * | 2014-12-26 | 2015-04-29 | 山西晋煤集团技术研究院有限责任公司 | Flip-flow screen dry fine coal removal dense medium separation method of lump coal before feed for washing |
| CN105750206A (en) * | 2016-02-19 | 2016-07-13 | 杨志辉 | Coal dressing method achieving whole-particle-size sorting |
| CN106694207A (en) * | 2016-12-23 | 2017-05-24 | 重庆市合川区九峰煤炭有限公司 | Integrated efficient coal washing process |
| CN109201334A (en) * | 2018-09-11 | 2019-01-15 | 乌拉特中旗毅腾矿业有限责任公司 | A kind of cleaning treatment technique raw coal early period |
| CN109647609A (en) * | 2019-01-14 | 2019-04-19 | 乌拉特中旗毅腾矿业有限责任公司 | A kind of raw coal initial stage cleaning treatment technique |
| CN109731674A (en) * | 2018-12-27 | 2019-05-10 | 山东科技大学 | A kind of steam coal separation method |
| CN109772571A (en) * | 2019-01-24 | 2019-05-21 | 中国矿业大学 | A kind of lump coal enters the coal jigging technique washed |
| CN112570137A (en) * | 2020-05-20 | 2021-03-30 | 汕头市国富锆钛实业有限公司 | Beneficiation method for separating zirconite by using grading jigger |
| CN115121363A (en) * | 2022-06-28 | 2022-09-30 | 安徽理工大学 | Coal washing device and washing method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103639032A (en) * | 2013-12-25 | 2014-03-19 | 河南神火煤业公司刘河选煤厂 | Centralized large lump coal crushing process |
| CN104549709A (en) * | 2014-12-26 | 2015-04-29 | 山西晋煤集团技术研究院有限责任公司 | Flip-flow screen dry fine coal removal dense medium separation method of lump coal before feed for washing |
| CN105750206A (en) * | 2016-02-19 | 2016-07-13 | 杨志辉 | Coal dressing method achieving whole-particle-size sorting |
| CN106694207A (en) * | 2016-12-23 | 2017-05-24 | 重庆市合川区九峰煤炭有限公司 | Integrated efficient coal washing process |
| CN109201334A (en) * | 2018-09-11 | 2019-01-15 | 乌拉特中旗毅腾矿业有限责任公司 | A kind of cleaning treatment technique raw coal early period |
| CN109731674A (en) * | 2018-12-27 | 2019-05-10 | 山东科技大学 | A kind of steam coal separation method |
| CN109731674B (en) * | 2018-12-27 | 2023-03-28 | 山东科技大学 | Power coal separation method |
| CN109647609A (en) * | 2019-01-14 | 2019-04-19 | 乌拉特中旗毅腾矿业有限责任公司 | A kind of raw coal initial stage cleaning treatment technique |
| CN109647609B (en) * | 2019-01-14 | 2020-12-01 | 乌拉特中旗毅腾矿业有限责任公司 | Initial clean treatment process for raw coal |
| CN109772571A (en) * | 2019-01-24 | 2019-05-21 | 中国矿业大学 | A kind of lump coal enters the coal jigging technique washed |
| CN112570137A (en) * | 2020-05-20 | 2021-03-30 | 汕头市国富锆钛实业有限公司 | Beneficiation method for separating zirconite by using grading jigger |
| CN115121363A (en) * | 2022-06-28 | 2022-09-30 | 安徽理工大学 | Coal washing device and washing method thereof |
| CN115121363B (en) * | 2022-06-28 | 2023-06-09 | 安徽理工大学 | Coal washing and selecting device and washing and selecting method thereof |
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