CN102319619B - Graded washing process for raw coal - Google Patents

Graded washing process for raw coal Download PDF

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Publication number
CN102319619B
CN102319619B CN 201110269731 CN201110269731A CN102319619B CN 102319619 B CN102319619 B CN 102319619B CN 201110269731 CN201110269731 CN 201110269731 CN 201110269731 A CN201110269731 A CN 201110269731A CN 102319619 B CN102319619 B CN 102319619B
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Prior art keywords
coal
raw coal
sorting
enters
spoil
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CN 201110269731
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CN102319619A (en
Inventor
何希霖
王玉生
李维华
赵建刚
李云志
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SHANDONG XINKUANG ZHAOGUAN ENERGY CO Ltd
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SHANDONG XINKUANG ZHAOGUAN ENERGY CO Ltd
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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

Graded washing process for raw coal
Technical field
The present invention relates to graded washing process for raw coal, particularly high percentage of shale content, easily pulverizing, high ash content Bed for Fine Coal steam coal separation technique how.
Background technology
Coal classification is selected, exactly feed coal is divided into some grades and carries out respectively sorting.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 not identical 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 Coal Preparation Plant, and smalls even can directly sell as marketable coal.
Extremely difficulty high for percentage of shale content, that ash content is high is divided coal separation at present, generally adopt two section two product cyclone pressurized feeding sorting process that heavily is situated between, but, easily pulverizing high because of the raw coal percentage of shale content, this technique is when having improved sharpness of separation, easily produce a large amount of secondary slimes, cause that slime content is large, 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 large, and technology arrangement is complicated, and the secondary slime amount is large.For raw coal percentage of shale content steam coal separation technique high, that easily pulverize, two kinds of techniques 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 enter jigging machine and wash sorting; The water that gained spoil, middle coal are exported respectively, gained piece cleaned coal enters after cleaned coal Dewatering sieve, the sorting enters dark cone concentration basin; The output of gained bulk cleaned coal, gained fritter cleaned coal enter centrifugal drier, backwater enters dark cone concentration basin; The output of gained fritter cleaned coal, centrifugate enter dark cone concentration basin; Underflow after dark cone concentration basin is concentrated enters cyclone; The underflow of cyclone enters high-frequency screen, overflowing liquid enters pipe chute thickener; The oversize of high-frequency screen enters centrifugal drier, backwater enters dark cone concentration basin; The overflowing liquid of dark cone concentration basin enters pipe chute thickener; The overflowing liquid of pipe chute thickener enters circulating water pool; Underflow after concentrated enters belt filter press; The output of gained coal slime, the gained filtrate water enters circulating water pool.To consume energy this technique process complexity, equipment large more, thereby its commercial Application is restricted.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of graded washing process for raw coal.
The term explanation
Coal classification: according to the raw coal ature of coal, in size fractionated raw coal ature of coal variation situation greatly, raw coal is carried out prescreening, different grades enters 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: refer to the heavy suspension medium.
Medium: refer to the heavy suspension medium.
Close the bucket that is situated between: the bucket that refers to fill qualified medium.
Technical scheme of the present invention is as follows:
A kind of graded washing process for raw coal comprises the steps:
Raw coal enters classifying screen and carries out classification through entering to wash belt; 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 entered the picking operation greater than the raw coal of 80mm, get rid of coal cinder behind the spoil and send into crusher in crushing and send into the cyclone that heavily is situated between to granularity less than 36mm and carry out sorting;
The raw coal of the 36-80mm of gained is entered jigging machine wash sorting; The spoil of gained, lump coal are exported respectively after the jigging machine sorting;
The raw coal less than 36mm of gained is entered the cyclone that heavily is situated between carry out sorting;
Heavy suspension medium in described heavy Jie's cyclone makes the bastard coal effective separation, and the spoil stream after the sorting is discharged from the bottom head piece, and mixed coal stream is discharged from overfall; The spoil stream of discharging and mixed coal flow point do not enter de-mediated, dehydration procedure separately, and the heavy suspension medium is carried out recycling.
Preferred according to the present invention, the heavy suspension medium in described heavy Jie's cyclone is magnetite powder, and Magnetic Materials 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 entered together the cyclone that heavily is situated between and carry out sorting.
De-mediated, the dehydration procedure of spoil stream of the present 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 described spoil stream, mixed coal stream are as follows:
1, spoil stream and mixed coal flow point are not carried out a de-mediated through separately de-mediated sieve bend, the lower medium of sieve is qualified medium, enter and close the bucket circulation that is situated between, on-the-sieve material enters straight-line oscillation dehydration sculping screen and carries out secondary de-mediated and dehydration, wherein medium is qualified medium under the front 1/3 section sieve of straight-line oscillation dehydration sculping screen, enters and closes the bucket circulation that is situated between; Rear 2/3 section adds and sprays water with high pressure, and the lower medium of sieve is rare medium, enters after magnetic separator reclaims and closes the bucket that is situated between.
2, the straight-line oscillation dehydration de-mediated on-the-sieve material of spoil stream is the spoil product, enters spoil transportation system; The straight line dehydration de-mediated vibration on-the-sieve material of mixed coal stream enters the mixed coal centrifugal dehydrator and carries out second dehydration, and material is the mixed coal product after the dehydration, enters mixed coal transportation system.
Main equipment is respectively jigging machine, heavily be situated between cyclone and raw coal sizing screen in the technique of the present invention, wherein, and preferred following equipment:
Described jigging machine is selected DMST-6 one hop count control jigging machine.This jigging machine is the lower 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 numerical control box, and the parameter adjusting is in time easy, and automaticity is higher than hand-operated jig.
Described heavy Jie's cyclone is two product cyclones, selects the FXJ1000 type, and underflow tap diameter is 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 large to have disposal ability, and the efficiency of separation is high, the advantage that sharpness of separation is high.
Described raw coal sizing screen is selected BRU-2-240/610 type classifying screen, and this classifying screen is Double-layer circular vibration screen, 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 separately sorting of+80mm grade bulk raw coal, the 36-80mm raw coal enters the jigging machine sorting, and-36mm raw coal enters dual medium cyclone dressing.
Above equipment is all commercially available.All the other used equipment also are the commercially available prod.
Technique of the present invention is particularly suitable for high percentage of shale content, the easily sorting of pulverizing, high ash content Bed for Fine Coal.Described high percentage of shale content refers to more than the percentage of shale content 50wt%, and high ash content refers to more than the content of ashes 55wt%, Bed for Fine Coal refer to 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 technique, utilizes the feature performance benefit of distinct device, carries out sorting with entering different sorting process behind the coal classification.The advantage that performance jigging machine sorting lump coal precision is high, production cost is low is with lump coal Jigging process sorting; High, the effective prerequisite of performance dual medium cyclone dressing Bed for Fine Coal precision is with the technique graded shot coal that heavily is situated between.Two kinds of technique combinations have effectively reduced spoil and have contained the coal amount, have reduced simultaneously coal slime output, have reduced the wasting of resources and loss.It is high to the lump coal separation precision that the present invention considers jigging machine, good separation effect, technology arrangement is simple, and the advantage that production cost is low is low in conjunction with the dual medium cyclone dressing lower limit, the characteristics that sharpness of separation is high, coal classification is entered 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 invention process, jigging machine sorting lump coal is higher because of calorific value, sells as independent product, the common coal of cost ratio is high 150 yuan/tons, simultaneously, has also reduced the production pressure of the system that heavily is situated between, reduce production cost, and improved quality and the rate of recovery of last marketable coal, had huge economic benefit.
Description of drawings
Fig. 1 is process chart of the present invention.
The specific embodiment
Invention is described further to present technique below in conjunction with example.But be not limited to this.
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 product.
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 only have 6%+the 80mm raw coal tells, and enters picking; The second layer is round-hole punched plate, and sieve seam is 36mm, is that 23.5% 36-80mm raw coal is told with productive rate, enters 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%, thoroughly enters the smalls belt behind the sieve, is transported to the raw coal reserving chamber that heavily is situated between, and enters the system's sorting that heavily is situated between.
Jigging machine has independent air feed system and digital control system for the lower air chamber type of 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 have de-mediated, dehydration procedure separately, and the medium recovery system is arranged.
The course of work is as follows:
Raw coal enters raw coal sizing screen and carries out pre-classification through entering 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, enters picking, get rid of enter behind the spoil crusher in crushing to granularity less than 36mm, sneak into-raw coal of 36mm enters in the lump the cyclone that heavily is situated between and carry out effective sorting; The 36-80mm raw coal enters 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 enters dual medium cyclone dressing, and the heavy suspension that configures is housed in the cyclone that heavily is situated between, and the heavy suspension medium is magnetite powder, and Magnetic Materials is Fe 2O 3,Content 〉=98wt% is less than 325 mesh content 〉=85%.The heavy suspension medium makes coal and spoil effective separation, 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), the lower medium of sieve is qualified medium, enter and close the bucket circulation that is situated between, on-the-sieve material enters respectively separately straight-line oscillation dehydration sculping screen (the prosperous good cleaning unit in Tengzhou City Co., Ltd is on sale) and carries out secondary de-mediated and dehydration, wherein medium is qualified medium under the front 1/3 section sieve of straight-line oscillation dehydration sculping screen, enters and closes the bucket circulation that is situated between; Rear 2/3 section adds and sprays water with high pressure, and the lower medium of sieve is rare medium, enters after magnetic separator reclaims and closes the bucket that is situated between.The straight-line oscillation dehydration de-mediated on-the-sieve material of spoil stream is the spoil product, enters spoil transportation system; Mixed coal stream straight line dehydration de-mediated vibration on-the-sieve material enters the mixed coal centrifugal dehydrator and carries out second dehydration, and material is the mixed coal product after the dehydration, enters mixed coal transportation system.
Effect:
Technique of the present invention is carried out application experiment in Dezhou, Shandong coal preparation plant of official Zhao energy company, and accumulative total is produced more than 9000 tons of medium sized coals, and income from sales increases by 1,350,000 yuan; The spoil calorific value reduces by 200 kilocalories, amounts to and reclaims more than 20,000 tons of marketable coal accumulative totals, and income from sales increases by 1,500,000 yuan; The coal slime productive rate reduces by 2.62%, and namely the marketable coal rate of recovery increases by 2.62%, and income from sales increases by 700,000 yuan.
This technology is after the field experiment, the jigging system and heavily Jie system produce pressure and all alleviate to some extent, main equipment and corollary equipment disposal ability all have more than needed, make mine hoisting production capacity 1.8Mt/a, the disposal ability of Recognition Applied in Coal Preparation System can be mated the above hoisting power of 2.0Mt/a, lays a good foundation for mine improves production capacity.

Claims (2)

1. a graded washing process for raw coal comprises the steps:
Raw coal enters classifying screen and carries out classification through entering to wash belt; 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 entered the picking operation greater than the raw coal of 80mm, get rid of coal cinder behind the spoil send into crusher in crushing to granularity less than 36mm, the coal less than 36mm that fragmentation obtains is sneaked into the raw coal less than 36mm that screening obtains and is entered together the cyclone that heavily is situated between and carry out sorting;
The raw coal of the 36-80mm of gained is entered jigging machine wash sorting; The spoil of gained, lump coal are exported respectively after the jigging machine sorting;
Heavy suspension medium in described heavy Jie's cyclone makes the bastard coal effective separation, and the spoil stream after the sorting is discharged from the bottom head piece, and mixed coal stream is discharged from overfall; The spoil stream of discharging and mixed coal flow point do not enter de-mediated, dehydration procedure separately, and the heavy suspension medium is carried out recycling;
De-mediated, the dehydration procedure operating procedure of described spoil stream, mixed coal stream are as follows:
(1) spoil stream and mixed coal flow point are not carried out a de-mediated through separately de-mediated sieve bend, the lower medium of sieve is qualified medium, enter and close the bucket circulation that is situated between, on-the-sieve material enters straight-line oscillation dehydration sculping screen and carries out secondary de-mediated and dehydration, wherein medium is qualified medium under the front 1/3 section sieve of straight-line oscillation dehydration sculping screen, enters and closes the bucket circulation that is situated between; Rear 2/3 section adds and sprays water with high pressure, and the lower medium of sieve is rare medium, enters after magnetic separator reclaims and closes the bucket that is situated between;
(2) the straight-line oscillation dehydration de-mediated on-the-sieve material of spoil stream is the spoil product, enters spoil transportation system; The straight-line oscillation dehydration de-mediated on-the-sieve material of mixed coal stream enters the mixed coal centrifugal dehydrator and carries out second dehydration, and material is the mixed coal product after the dehydration, enters mixed coal transportation system.
2. graded washing process for raw coal as claimed in claim 1 is characterized in that the heavy suspension medium in described heavy Jie's cyclone is magnetite powder, and Magnetic Materials is Fe 2O 3, content 〉=98wt% is less than 325 mesh content 〉=85%.
CN 201110269731 2011-09-13 2011-09-13 Graded washing process for raw coal Expired - Fee Related CN102319619B (en)

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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
CN109201334B (en) * 2018-09-11 2020-09-08 乌拉特中旗毅腾矿业有限责任公司 Clean treatment process for raw coal at earlier stage
CN109731674A (en) * 2018-12-27 2019-05-10 山东科技大学 A kind of steam coal separation method
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
CN109772571B (en) * 2019-01-24 2020-03-17 中国矿业大学 Jigging coal separation process for washing lump coal

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