CN101530824B - A coal dressing method and system of four-product jigging primary cleaning, secondary head coal small simplified heavy medium reelecting - Google Patents
A coal dressing method and system of four-product jigging primary cleaning, secondary head coal small simplified heavy medium reelecting Download PDFInfo
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Abstract
The invention discloses a coal dressing method and system of four-product jigging primary cleaning and secondary head coal small simplified heavy medium reelecting. The invention is a coal dressing method and system that selects the secondary head coal product through the four-product jigging technique and then reelects the secondary head coal with small simplify heavy medium separation technology. The adoption of the invention to select coal is characterized by less total investment, simpler system and lower operational expense, which can improve the stability of the system, reduce the powerconsumption, simplify the managing and maintaining work. The method can be easily realized with present technical merits, which is beneficial to be popularized in the middle and small coal washeries where the management level is low and if the method is used in oversize coal washeries, the cost for washing is lower.
Description
Affiliated technical field
The present invention relates to a kind of coal preparation method and technique, especially relate to coal preparation method and Recognition Applied in Coal Preparation System that a kind of four-product jigging main separation, inferior cleaned coal small simplified heavy medium are selected again.
Background technology
At present, both at home and abroad the most frequently used coal preparation method of coal preparation plant has two kinds of coal jigging method and heavy media coal separation methods, wherein: the coal jigging method has small investment, running expense is low, treating capacity is large, the advantages such as technique is simple, and equipment control is convenient, and weak point is to select above coal sharpness of separation low to difficulty; And the heavy media coal separation method has the pluses and minuses opposite with the coal jigging method.Facts have proved for many years, but the choosing of jigging commute and medium coal separation are applicable, it is applicable to difficulty choosing and utmost point difficult separation coal heavily to be situated between, and these two kinds of each have their own scope of applications of method do not have a kind of method can substitute another kind under any condition.In order to develop both advantages, overcome both deficiencies, in the past few years many experts and scholar have successively developed some jiggings and the combined coal-dressing method that heavily is situated between, contained two product jigging discharge refuses, (the middle coal+cleaned coal) of " mineral dressing " book 262-269 page or leaf of publishing such as publishing house of China Mining University in October, 2002 second impression heavily is situated between and washes, and three products jigging master washes, middle coal heavily is situated between the method such as washes again.From density and the relation with contents curve map (as shown in Figure 1) of a certain difficult separation coal, if by existing two product jigging discharge refuses, (middle coal+cleaned coal) the again washing method sorting that heavily is situated between, the treating capacity that heavily is situated between reaches 88%.If by existing three products jigging master wash, middle coal heavily is situated between again washing method sorting, the treating capacity that heavily is situated between reaches 48%.There are the following problems for these methods: get involved heavily 1. that to wash the partial feed cleaning amount system that greatly, heavily is situated between huge; 2. the large system of two covers is with depositing, and gross investment is high; 3. the large system of two covers is with operation, complexity; 4. cost of business operation is high.Just because of these problems, so that these good methods can not be applied preferably.This has become expert and scholar for many years always in effort, and never obtains something of fine solution.
Analyze from the principle of coal jigging method, coal jigging is that coal carries out sorting by density variation in the speed change current of vertical lift, this sorting is relevant with granularity and the shape of coal, belong to a kind of coarse fuzzy sorting, the result is that the material within theoretical separa tion density δ ± 0.1 can not strictly separate by proportion.
Density and relation with contents curve map (as shown in Figure 1) from a certain difficult separation coal, content within the theoretical separa tion density 1.41 ± 0.1 reaches 28%, if only this wherein not thin-graded that some of the utmost point take out the choosing that heavily is situated between again, heavily getting involved the amount of washing will be less than 20%, this will become many times reduce heavily to be situated between system scale.
Summary of the invention
The purpose of this invention is to provide and a kind ofly by four-product jigging technology raw coal is divided into spoil, middle coal, inferior cleaned coal, four products of cleaned coal first, and then the coal preparation method that time cleaned coal is selected with small simplified heavy medium sorting technology again.The method has gross investment still less, and system is simpler, and the advantage that cost of business operation is lower can reach the raising system reliability, reduces system power dissipation, the purpose of streamlining management and maintenance work.The method can realize under the prior art level easily, is conducive to promote the use of in the medium and small coal washery of the horizontal backward areas of operational administrative, uses the washing cost lower in super-huge coal washery.
Technical scheme of the present invention is summarized as follows:
The coal preparation method that a kind of four-product jigging main separation, inferior cleaned coal small simplified heavy medium select again, comprise existing three sections coal jigging methods and small simplified heavy medium coal preparation method, in three sections coal jigging methods, the middle product of coal of the 3rd section discharge of jigging machine is carried out online again sorting by small simplified heavy medium Recognition Applied in Coal Preparation System.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select is again wherein controlled the product quality of the 3rd section discharge of jigging machine, allows the product quality of this section discharge be the inferior cleaned coal close to separating density.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, the quantity that wherein controls the product of the 3rd section discharge of jigging machine arrives minimum.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, its middle-size and small-size dense media are simplified Recognition Applied in Coal Preparation System for there being two product heavy-medium cyclones of pressure to simplify separation system.
It is that three products heavy medium cyclone is simplified separation system that the coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, its middle-size and small-size dense media are simplified Recognition Applied in Coal Preparation System.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, its middle-size and small-size dense media are simplified the dense media simplification separation system that Recognition Applied in Coal Preparation System is other form.
Another object of the present invention provides the Recognition Applied in Coal Preparation System that a kind of four-product jigging main separation, inferior cleaned coal small simplified heavy medium are selected again, comprises following process procedure:
A. raw coal is carried out the sorting of four-product jigging;
B. the inferior head coal product of the 3rd section discharge of jigging machine, send into the sorting link that heavily is situated between;
C. after other products obtained therefrom cleaned coal, middle coal and spoil dewater respectively, in coal and spoil product send into respectively middle coal bunker and waste bin, cleaned coal enters next step;
D. the head coal product from step c is carried out primary dewatering and second dehydration, the gained sieve is top grade to be the piece head coal product, and sends into the cleaned coal storehouse; The sieve low-grades enter buffer barrel, send into cleaned coal mud concentrate cyclone with the cleaned coal dredge pump again and concentrate, and concentrated gained overflow enters the flotation link, and concentrated gained underflow enters cleaned coal mud high-frequency screen;
E. cleaned coal mud high-frequency screen gained sieve is top grade is thin head coal product, and sends into the cleaned coal storehouse; Cleaned coal mud high-frequency screen gained sieve is gone to the bottom and is flow to into the flotation link;
F. the inferior cleaned coal from step b is carried out fragmentation and sends into the qualified medium bucket, be pumped into two products with qualified medium and have and press cyclone to carry out sorting afterwards;
G. counterweight Jie sorting products obtained therefrom cleaned coal, middle coal carry out respectively a de-mediated, and the sieve low-grades of described cleaned coal enter shunting, and the sieve low-grades of part shunting and middle coal enter the qualified medium bucket, wherein sieve the top grade next step that enters;
H. two kinds of products from step g are carried out respectively secondary de-mediated, dehydration, wherein the selected sieve of two kinds of products is top grade is respectively cleaned coal piece, middle coal cinder, and sends into respectively cleaned coal storehouse and middle coal bunker;
I. collect cleaned coal among the above-mentioned steps h and rare Jie of sieve low-grades of middle coal secondary de-mediated, and from the part shunting of step g, carry out magnetic separation;
J. magnetic separation gained medium enters the qualified medium bucket, and magnetic separation gained mine tailing is sent into middle coal slime bucket;
K. to the mine tailing in the middle coal slime bucket in step j, with in the coal medium pump send into middle coal slime concentrate cyclone and concentrate, concentrated gained overflow enters the flotation link, concentrated gained underflow enters middle coal slime high-frequency screen;
L. middle coal slime high-frequency screen gained sieve is top grade is middle product of coal, and sends into middle coal bunker; Middle coal slime high-frequency screen gained sieve is gone to the bottom and is flow to into next step;
M. send into flotation device after overflow converges from underflow under the sieve of step l with from step k;
N. carry out flotation to the black water from step k and step m, and from the black water of steps d and step e, the gained flotation concentrate enters the concentrate pond, and the gained flotation tailing enters thickener;
O. to entering the flotation concentrate in the concentrate pond among the above-mentioned steps n, deliver in the clean coal pressur filter with the concentrate feed pump and dewater, the gained filter cake is the fine cleaned coal product, and sends into the cleaned coal storehouse; Gained filtrate enters circulating water pool;
P. to from the black water that enters thickener among the step n, concentrate in thickener, gained overflows to circulating water pool, and the gained underflow is delivered in the tail coal filter press with the mine tailing feed pump and dewatered, and the gained filter cake is product from failing, and sends into tailing bin; Gained filtrate enters circulating water pool;
Q. to from the filtrate of step o and filtrate and the overflow of step p, in circulating water pool, store, with water circulating pump for systemic circulation;
R. circulating water pool is added the water of disappearance;
S. the qualified medium bucket is added the medium of disappearance.
The Recognition Applied in Coal Preparation System that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, wherein control the product quality of the 3rd section discharge of jigging machine among the above-mentioned steps b, allow the product quality of this section discharge be the inferior cleaned coal close to separating density, and the product quantity of the 3rd section discharge of control jigging machine is to minimum.
The Recognition Applied in Coal Preparation System that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, wherein to cleaned coal second dehydration, classification, and products obtained therefrom also comprises the steps: behind the clean coal slime dewatering
Gained smalls is wherein carried out centrifugal dehydration;
Fine cleaned coal sieves top and is divided into the fine cleaned coal product after centrifugal dehydration, send into the cleaned coal storehouse, and the lower part of screen is divided into black water and enters buffer barrel, carries out flotation.
The present invention compares with Recognition Applied in Coal Preparation System with dense media combined coal-dressing method with the jigging of prior art, has fully shown following advantage:
1. heavily Jie's scale reduces 2-4 doubly, has reduced to greatest extent the system that heavily is situated between;
2. brought into play to greatest extent the advantage of jigging;
3. gross investment more economizes, and system is simpler, and cost of business operation is lower;
4. improve system reliability, reduced system power dissipation, streamlining management and maintenance work;
5. the method and technique can realize under the prior art level conditions easily;
6. be more conducive in the medium and small coal washery of the horizontal backward areas of operational administrative, promote the use of;
Cost is lower when 7. using washing in super-huge coal washery.
In sum, advantage of the present invention is: system's investment reduces, and system reliability improves, and system consumption power reduces, it is further simple to administer and maintain work, coal preparation method and Recognition Applied in Coal Preparation System that to be the jigging more simplified in a kind of present coal separation industry unite with dense media.
Description of drawings
Fig. 1 represents a kind of density and relation with contents curve synoptic diagram of difficult separation coal
Fig. 2 represents the Recognition Applied in Coal Preparation System process flow diagram that a kind of four-product jigging main separation, inferior cleaned coal small simplified heavy medium select again
The specific embodiment
Technical method of the present invention is summarized as follows:
The coal preparation method that a kind of four-product jigging main separation, inferior cleaned coal small simplified heavy medium select again, comprise existing three sections coal jigging methods and small simplified heavy medium coal preparation method, in three sections coal jigging methods, the middle product of coal of the 3rd section discharge of jigging machine is carried out online again sorting by small simplified heavy medium Recognition Applied in Coal Preparation System.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select is again wherein controlled the product quality of the 3rd section discharge of jigging machine, allows the product quality of this section discharge for relatively close to the inferior cleaned coal of separating density.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, the quantity that wherein controls the product of the 3rd section discharge of jigging machine arrives minimum.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, its middle-size and small-size dense media are simplified Recognition Applied in Coal Preparation System for there being two product heavy-medium cyclones of pressure to simplify separation system.
It is that three products heavy medium cyclone is simplified separation system that the coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, its middle-size and small-size dense media are simplified Recognition Applied in Coal Preparation System.
The coal preparation method that four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium select again, its middle-size and small-size dense media are simplified the dense media simplification separation system that Recognition Applied in Coal Preparation System is other form.
Below in conjunction with accompanying drawing Recognition Applied in Coal Preparation System technological process of the present invention is done as detailed below:
Fig. 2 is the Recognition Applied in Coal Preparation System process chart that a kind of four-product jigging main separation, inferior cleaned coal small simplified heavy medium select again, in the jigging system, be with first water running, heavily be with first the qualified medium operation in Jie system, behind two system's normal operations, raw coal feeds three sections jigging machines 2 through coal supply link 1, and its technological process comprises the steps:
A. after raw coal enters three sections jigging machines 2, sub-elect cleaned coal, middle coal, inferior cleaned coal, four kinds of products of spoil by this jigging machine;
B. the inferior head coal product of the 3rd section discharge of three sections jigging machines 2, send into the sorting link 35 that heavily is situated between;
C. other products obtained therefrom cleaned coal, middle coal and spoil dewater respectively, and coal and spoil product are sent into respectively middle coal bunker 19 and waste bin 18 in the rear handle, and cleaned coal enters next step;
D. the head coal product from step c is entered camber sieve 3 successively and straight line shaker 4 carries out primary dewatering and second dehydration, the gained sieve is top grade to be the piece head coal product, and sends into cleaned coal storehouse 20; The sieve low-grades enter buffer barrel 5, send into cleaned coal mud concentrate cyclone 7 with cleaned coal dredge pump 6 again and concentrate, and are concentrated that overflow enters flotation link 9, and concentrated gained underflow enters cleaned coal mud high-frequency screen 8;
E. cleaned coal mud high-frequency screen 8 gained sieve is top grade is thin head coal product, and sends into cleaned coal storehouse 20; Cleaned coal mud high-frequency screen 8 gained sieve is gone to the bottom and is flow to into flotation link 9;
F. the inferior cleaned coal from step b is carried out fragmentation 35 and sends into qualified medium bucket 33, sending into two products with qualification medium pump 34 has the cyclone 22 of pressure to carry out sorting.
G. counterweight Jie sorting gained head coal product carries out a de-mediated 23, product of coal carries out a de-mediated 24 in counterweight Jie sorting gained, the sieve low-grades of described cleaned coal enter shunting 26, and the sieve low-grades of part shunting and middle coal enter qualified medium bucket 33, wherein sieve the top grade next step that enters;
H. the head coal product from step g is carried out secondary de-mediated, dehydration 25, wherein selected sieve is top grade is the cleaned coal piece, and sends into cleaned coal storehouse 20; Middle product of coal from step g is carried out secondary de-mediated, dehydration 27, and wherein selected sieve is top grade is middle coal cinder, and sends into middle coal bunker 19;
I. collect cleaned coal among the above-mentioned steps h and rare Jie of sieve low-grades of middle coal secondary de-mediated, and from the part shunting of step g, carry out magnetic separation 28;
J. magnetic separation 28 gained media enter qualified medium bucket 33, and magnetic separation 28 gained mine tailings are sent into middle coal slime bucket 29;
K. to from the mine tailing in the middle coal slime bucket 29 among the step j, with in coal medium pump 30 send into middle coal slime concentrate cyclone 31 and concentrate, concentrated gained overflow enters flotation link 9, concentrated gained underflow enters middle coal slime high-frequency screen 32;
L. middle coal slime high-frequency screen 32 gained sieve is top grade is middle product of coal, and sends into middle coal bunker 19; Middle coal slime high-frequency screen gained sieve is gone to the bottom and is flow to into next step;
M. send into flotation device 9 after overflow converges from underflow under the sieve of step l with from step k;
N. carry out flotation 9 to the black water from step k and step m, and from the black water of steps d and step e, the gained flotation concentrate enters concentrate pond 10, and the gained flotation tailing enters thickener 13;
O. to entering the flotation concentrate in the concentrate pond 10 among the above-mentioned steps n, deliver in the clean coal pressur filter 12 with concentrate feed pump 11 and dewater, the gained filter cake is the fine cleaned coal product, and sends into cleaned coal storehouse 20; Gained filtrate enters circulating water pool 16;
P. to from the black water that enters thickener 13 among the step n, concentrate in thickener, gained overflows to circulating water pool 16, and the gained underflow is delivered in the refuse filter press 15 with mine tailing feed pump 14 and dewatered, the gained filter cake is product from failing, and sends into tailing bin 21; Gained filtrate enters circulating water pool 16;
Q. to from the filtrate of step o and filtrate and the overflow of step p, in circulating water pool 16, store, use water circulating pump 17 for systemic circulation during use;
R. circulating water pool 16 is added the water of disappearance;
S. qualified medium bucket 33 is added the medium of disappearance.
In the above-mentioned processing step, and the conveying that does not indicate on the figure, recirculated water, moisturizing, detection, control, the system such as electric be routine techniques, no longer narration here.
Based on same principle and method, the present invention can be in above-mentioned processing step b, product quality and the quantity of control jigging machine the 3rd section discharge, allow the product quality of this section discharge for relatively close to the inferior cleaned coal of separating density, make the product quantity of the 3rd section discharge of jigging machine minimum.Do like this and can reach goal of the invention equally, and can bring into play to a greater extent the function of jigging machine, reduce to greatest extent scale and the treating capacity of the system that heavily is situated between.
Based on same principle and method, the present invention can in above-mentioned processing step, increase cleaned coal second dehydration, classification, and gained smalls product carry out the centrifugal dehydration step behind the clean coal slime dewatering:
Fine cleaned coal sieves top and is divided into the fine cleaned coal product after centrifugal dehydration, send into the cleaned coal storehouse, and the lower part of screen is divided into black water and enters buffer barrel, carries out flotation; Do like this and can reach goal of the invention equally, and can further reduce head coal product moisture content.
Based on same principle and method, the present invention can in above-mentioned processing step, increase buffering, pumping, preprocessor link before flotation device.Do like this and can reach goal of the invention equally.Described buffering, pumping, preprocessor link are routine techniques, here no longer narration.
In sum, above embodiment is described as the basis take a kind of typical process flow shown in Figure 2, based on same principle and method, the present invention also can be incorporated in the flow process by the principle in the technique shown in Figure 2 and the method small simplified heavy medium sorting process with other pattern, realizes equally the process coal preparation flowsheet that the four-product jigging main separation of corresponding form, inferior cleaned coal small simplified heavy medium select again.
As mentioned above, the coal preparation method and the technique that adopt a kind of four-product jigging main separation of the present invention, inferior cleaned coal small simplified heavy medium to select again, can obtain the investment of minimizing system, improve system reliability, reduce system consumption power, improving the effect of the work that administers and maintains, is jigging and the dense media combined coal-dressing Method and process of more simplifying in a kind of present coal separation industry.
The invention discloses coal preparation method and technique that a kind of four-product jigging main separation, inferior cleaned coal small simplified heavy medium are selected again; although more than enumerated less embodiment; but for those of ordinary skill in the art; some remodeling that the present invention is done, improvement, replacement etc.; perhaps above-mentioned embodiment is done any combination variation, all drops within protection scope of the present invention.
Claims (2)
1. coal preparation method that four-product jigging main separation, inferior cleaned coal small simplified heavy medium select again, comprise existing three sections coal jigging methods and small simplified heavy medium coal preparation method, it is characterized in that: in three sections coal jigging methods the inferior head coal product of the 3rd section discharge of jigging machine is carried out online again sorting by small simplified heavy medium Recognition Applied in Coal Preparation System, it comprises following technological process:
A. raw coal is carried out the sorting of four-product jigging;
B. the inferior head coal product of the 3rd section discharge of jigging machine, send into the sorting link that heavily is situated between;
C. after other products obtained therefrom cleaned coal, middle coal and spoil dewater respectively, in coal and spoil product send into respectively middle coal bunker and waste bin, cleaned coal enters next step;
D. to carrying out primary dewatering and second dehydration from step c head coal product, the gained sieve is top grade to be the piece head coal product, and sends into the cleaned coal storehouse; The sieve low-grades enter buffer barrel, send into cleaned coal mud concentrate cyclone with the cleaned coal dredge pump again and concentrate, and concentrated gained overflow enters the flotation link, and concentrated gained underflow enters cleaned coal mud high-frequency screen;
E. cleaned coal mud high-frequency screen gained sieve is top grade is thin head coal product, and sends into the cleaned coal storehouse; Cleaned coal mud high-frequency screen gained sieve is gone to the bottom and is flow to into the flotation link;
F. the inferior cleaned coal from step b is carried out fragmentation and sends into the qualified medium bucket, rear being pumped into qualified medium presses two product heavy-medium cyclones to carry out sorting;
G. counterweight Jie sorting products obtained therefrom cleaned coal, middle coal carry out respectively a de-mediated, and the sieve low-grades of described cleaned coal enter shunting, and the sieve low-grades of part shunting and middle coal enter the qualified medium bucket, wherein sieve the top grade next step that enters;
H. two kinds of products from step g are carried out respectively secondary de-mediated, dehydration, wherein the selected sieve of two kinds of products is top grade is respectively cleaned coal piece, middle coal cinder, and sends into respectively cleaned coal storehouse and middle coal bunker;
I. collect rare Jie of sieve low-grades of above-mentioned steps h cleaned coal and the de-mediated of middle coal secondary, and shunt from the part of step g, carry out magnetic separation;
J. magnetic separation gained medium enters the qualified medium bucket, and magnetic separation gained mine tailing is sent into middle coal slime bucket;
K. to from the mine tailing in the middle coal slime bucket among the step j, with in the coal medium pump send into middle coal slime concentrate cyclone and concentrate, concentrated gained overflow enters the flotation link, concentrated gained underflow enters middle coal slime high-frequency screen;
L. middle coal slime high-frequency screen gained sieve is top grade is the detail product of coal, and sends into middle coal bunker; Middle coal slime high-frequency screen gained sieve is gone to the bottom and is flow to into next step;
M. send into flotation device after overflow converges from underflow under the sieve of step 1 with from step k;
N. carry out flotation to the black water from step k and step m, and from the black water of steps d and step e, the gained flotation concentrate enters the concentrate pond, and the gained flotation tailing enters thickener;
O. to entering the flotation concentrate in the concentrate pond among the above-mentioned steps n, deliver in the clean coal pressur filter with the concentrate feed pump and dewater, the gained filter cake is the fine cleaned coal product, and sends into the cleaned coal storehouse; Gained filtrate enters circulating water pool;
P. to from the black water that enters thickener among the step n, concentrate in thickener, the gained overflow is discharged to circulating water pool, and the gained underflow is delivered in the refuse filter press with the mine tailing feed pump and dewatered, and the gained filter cake is product from failing, and sends into tailing bin; Gained filtrate enters circulating water pool;
Q. to from the filtrate of step o and filtrate and the overflow of step p, in circulating water pool, store, with water circulating pump for systemic circulation;
R. circulating water pool is added the water of disappearance;
S. the qualified medium bucket is added the medium of disappearance.
2. the coal preparation method that selects again of a kind of four-product jigging main separation as claimed in claim 1, inferior cleaned coal small simplified heavy medium is characterized in that: have two product heavy-medium cyclones of pressure to replace with three products heavy medium cyclone and simplify separation system.
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| CN 200910131301 CN101530824B (en) | 2009-04-14 | 2009-04-14 | A coal dressing method and system of four-product jigging primary cleaning, secondary head coal small simplified heavy medium reelecting |
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| CN108273655A (en) * | 2018-01-12 | 2018-07-13 | 华北科技学院 | A kind of coal jigging system and method |
| CN108296009B (en) * | 2018-01-29 | 2020-11-03 | 内蒙古伊泰煤炭股份有限公司 | Coal deep processing method and coal treatment method |
| CN109201314B (en) * | 2018-09-11 | 2020-12-01 | 乌拉特中旗毅腾矿业有限责任公司 | Clean utilization production process for middlings |
| CN109701729B (en) * | 2019-01-14 | 2020-11-17 | 乌拉特中旗毅腾矿业有限责任公司 | Clean utilization production process for middlings |
| CN109794349B (en) * | 2019-03-08 | 2020-03-17 | 中国矿业大学 | Underground coal dressing process |
| CN109718944B (en) * | 2019-03-08 | 2019-11-29 | 中国矿业大学 | A kind of aqueous medium underground coal preparation technique |
| CN114887758B (en) * | 2022-04-26 | 2023-10-20 | 鞍钢集团矿业有限公司 | Stage grinding and selecting process for magnetite ore with sand setting and tailing discarding functions |
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2009
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