CN103350027A - Classified-desliming pressurized-feeding three-product dense medium cyclone coal preparation process - Google Patents
Classified-desliming pressurized-feeding three-product dense medium cyclone coal preparation process Download PDFInfo
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Abstract
Provided is a classified-desliming pressurized-feeding three-product dense medium cyclone coal preparation process. The process comprises the steps that wet classification and primary desliming are carried out on raw coal after prescreening, gangue predischarging and breaking are carried out on the raw coal, secondary desliming is carried out on the screen underflow of the raw coal after the screen underflow is concentrated, the oversize products of the secondary desliming and the screen underflow of the primary desliming are together fed in a pressurized three-product cyclone, three products are obtained after separation, and clean coal, middle coal and gangue are obtained after medium separation and dehydration are carried out on the three products. Part of qualified suspension liquid and dilute suspension liquid are obtained when the medium separation is carried out on the three products, magnetic concentrate is obtained after the dilute suspension liquid is recovered by a magnetic separator, and the magnetic concentrate and the qualified suspension liquid are directly fed in a medium blending barrel. The magnetic tailings of the dilute suspension liquid and the undersize mixtures of pre-desliming, the overflow of concentration classifying equipment and a secondary desliming screen enter a coal slime recovery processing system together. The process is high in separation efficiency, flexible in product structure, low in producing and operating cost and prone to achieving the large-scale single system, the modularization and the integrating intellectualization of plant layout.
Description
Technical field
The present invention relates to a kind of raw coal sorting process, particularly relate to a kind of graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique.
Background technology
The external coal preparation technique technology that mainly adopts is at present: desliming before the choosing+two product heavy-medium cyclone main separations+two product heavy-medium cyclones select+coal slime choosing recovery technique again.There is system complex in this technique, management inconvenience, the deficiency that construction investment is higher.The coal preparation technique technology of domestic main employing is: desliming before the full level of not desliming selected heavily be situated between technique and the choosing+reclaim technique without ballast Jie technique+coal slime.These two kinds of techniques all exist the factory building volume large, and construction investment is high, the deficiency that the production run cost is high.
According to China's energy resource structure and resources characteristic, in order to adapt to the development of national economy and market economy, and the requirement of suitable environmental protection, state coal industrial development planning proposes, and greatly develop clean coal technology.In recent years, intensification along with the coal in China recovery percent, increasing of spoil content, the increase of smalls amount, former coal washability variation, improve increasingly to the head coal product quality requirement in market, in addition coal resource integration, eliminate the coal preparation plant of a collection of low production capacity, poor efficiency, high energy consumption, build coal preparation plant large-size intelligentized, efficient integrated, become the inexorable trend of current construction of coal preparation plant.Coal preparation technology is as the source technology of clean coal technology, and the research of coal preparation technique is become the most important thing that overcomes the above problems.
Summary of the invention
Construction is large-size intelligentized in order to adapt to, the needs of the coal preparation plant of efficient integrated, the present invention is directed to the prior art systems complexity, management inconvenience, and the factory building volume is large, and construction investment is high, the deficiency that the production run cost is high.Provide that a kind of efficiency of separation is high, product structure is flexible, the production run cost is low, is easy to realize that factory building arranges modularization, reduces the coal classification desliming pressurized feeding three products heavy medium cyclone coal preparation method of capital expenditure.
Realize above-mentioned purpose by the following technical solutions:
A kind of graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique, the method comprise prescreening, the pre-discharge refuse of moving sieve, fragmentation; Graded desliming; The secondary desliming; Sorting; Dehydration, de-mediated; Medium circulation, reclaim, add system; Coarse slime reclaims; Separation of fine slime recycling step, the concrete operation step of described technique is:
A. prescreening, the pre-discharge refuse of moving sieve, fragmentation: with raw coal prescreening vibratory sieve prescreening, oversize is carried out control hand picking, reach especially big after picking foreign material wherein, enter moving sieve waste stone exhaust system and discharge grade greater than the spoil of 50mm, its light product is carried out fragmentation, grade is controlled at below the 50mm, mixes as main shop sorting feed coal with prescreening vibratory sieve screenings;
B. graded desliming: the ready feed coal of a step enters the desliming screen of main shop, carries out the wet classification desliming, and the thin mud that removes less than 0.5～1 mm enters deep cone thickener; Oversize enters coal Jie mixing tank;
C. secondary desliming: the underflow high-frequency screen desliming of b step deep cone thickener, the high-frequency screen oversize enters coal Jie mixing tank; The overflow of high-frequency screen screenings and deep cone thickener enters the floatation feed pond together;
D. sorting: the material of coal Jie mixing tank has entered presses three-product cyclone to carry out sorting, obtains cleaned coal, middle coal, three kinds of products of spoil;
E. dehydration, de-mediated: after the spoil product fed spoil de-mediated equipment, obtain qualified spoil product; Obtain qualified middle coal and head coal product after middle coal and two kinds of products of cleaned coal are fed de-mediated, dehydration equipment successively;
F. medium circulation, reclaim, add system: the cleaned coal of d step, middle coal, three kinds of products of spoil are fed respectively the de-mediated device processes, obtain qualified suspension and dilute suspension, the qualified suspension that obtains directly is recovered in coal Jie mixing tank recycles; The dilute suspension that obtains is fed respectively magnetic separator reclaim, reclaim the magnetic concentrate that obtains and enter into coal Jie mixing tank.After adding medium and adopting qualified magnetite powder thin up to stir, feed coal Jie mixing tank and recycle;
G. coarse slime reclaims: the overflow of the lower black water of b step raw coal desliming screen sieve, deep cone thickener and the lower black water of secondary desliming high-frequency screen sieve enter the floatation feed pond together.The magnetic tailing of e step reclaims respectively the coal slime product by vibration sieve bend, coal slime centrifuge integration of operation dehydration.Low ash coal mud is incorporated into the main separation head coal product; Ash coal mud is incorporated into product of coal in the main separation.Cleaned coal vibration sieve bend backwater and coal slime centrifuge centrifugate enter the floatation feed pond, and middle coal vibration sieve bend backwater and middle coal centrifuge centrifugate enter the tail coal thickener;
H. separation of fine slime reclaims: the black water in floatation feed pond feeds flotation device, carries out the fine slime sorting, and flotation concentrate adopts clean coal pressur filter to reclaim cleaned coal mud; Flotation tailing enters the tail coal thickener, and its underflow reclaims tail coal mud with the tail coal filter press, and clean coal pressur filter filtrate, the overflow of tail coal thickener enter circulating water pool together, as full factory cycling use of water.The filtrate of tail coal filter press is returned again concentration and recovery of tail coal thickener.
Further, the screenings of described prescreening is the raw coal of φ 50 ㎜～80mm.
Further, described vibration desliming screen sieve seam δ=0.5～3mm.
Further, the magnetic tailing of described dilute suspension adopts vibration sieve bend, coal slime centrifuge integration of operation.
Further, in the described graded desliming step, the addition of water and the weight ratio of material are 1:1.5.
Further, described dehydration equipment, de-mediated equipment, concentrator, flotation filtering equipment are common apparatus.
Further, dehydration equipment, de-mediated EM equipment module layout that described this technique is used are divided into: graded desliming sorting process functional module system; The sorting process functional module that heavily is situated between system; Black water treatment process functional module system.
Compared with prior art, remarkable result of the present invention is:
1, the efficiency of separation is high, product structure is flexible, and the production run cost is low.
The desliming of raw coal pre-classification enters to wash, and heavily slime content is few in Jie system, heavy medium cyclone sharpness of separation high (Ep1=0.02, Ep2=0.025), dielectric loss low (≤1.5Kg/t), system is reliable and stable.Employing has the sorting of the three-product cyclone of pressure equipment, and process system is simple, convenient management, and sharpness of separation is high, can adapt to different user to the requirement of ature of coal, and to the ature of coal strong adaptability, lower limit of separation is low, has reduced power consumption and production run cost.
2. be easy to realize factory building layout modularization, provide assurance for reducing capital expenditure.
Can realize modular arrangement according to the sorting process function: graded desliming sorting process functional module system; The sorting process functional module that heavily is situated between system; Black water treatment process functional module.Equipment reasonable Arrangement in the module closely is connected between disparate modules, takes full advantage of the factory building space, has reduced factory building height, has reduced the factory building volume, can make the factory building capital expenditure save 30-40%.
3. be easy to realize that the single system disposal ability maximizes, provide technical support for building Large Coal Washing Plant.
For the coal property of different stage, taken full advantage of and pressed the three-product cyclone lower limit of separation low, to the high characteristics of smalls coal sharpness of separation, save the separation of coarse slime system, not only reduced equipment investment, also simplified process system, increase Systems balanth, realized the coal high-efficiency sorting.Because separation system is simple and reliable, be easy to realize that the single system disposal ability maximizes, provide technical support for building Large Coal Washing Plant.
4. be easy to realize the efficient automatic intelligent control of full factory, technical guarantee is provided for production management is convenient.
Because system is simple and reliable, heavy media coal separation has the advantages that to regulate the separation index simple and flexible, is easy to realize the efficient automatic intelligent control of full factory, and technical guarantee is provided for production management is convenient.Generally speaking density of suspending liquid is finely tuned and to reach the purpose of adjusting product quality.Also can reach the purpose of adjusting the product mix by adjusting suspension character or hydrocyclone structure parameter.
Description of drawings
Fig. 1 is process chart of the present invention.
Sign flag among the figure: G spoil, grey slag line, H qualified medium line, the rare dielectric wire of X, C magnetic tailing line, M coal slime waterline, Y floating agent line, N flocculant line, D drips, water-proof wire.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Present embodiment is a kind of graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique, and the used equipment of this technique has: prescreening classifying screen, disintegrating machine, desliming oscillating screen, secondary desliming high-frequency screen, coal Jie mixing tank, the three-product cyclone of pressure, Coal Stone Separation, middle coal sculping screen, head coal sculpingscreen, magnetic separator are arranged, dark cone is concentrated, coarse slime reclaims and separation of fine slime recovery system equipment (vibration sieve bend, coal slime centrifuge, flotation device, clean coal pressur filter, tail coal filter press, tail coal thickener) etc.According to factory's type scale, adopt this technique, modular arrangement is carried out in the workshop, and capital equipment has: desliming oscillating screen, a secondary desliming oscillating screen, have and press to three-product cyclone, Coal Stone Separation, middle coal sculping screen, head coal sculpingscreen, magnetic separator.The coal slime recovery system is positioned at the tail end of whole separation system.Between each system, be connected with chute and pipeline according to functional sequence between the equipment.
Concrete technology step embodiment of the present invention sees Fig. 1:
1. prescreening, the pre-discharge refuse of moving sieve, fragmentation: raw coal is fed first disintegrating machine carry out fragmentation, grade is controlled at below the 300mm, and the raw coal after fragmentation enters run coal bin.The coal of run coal bin at first carries out prescreening, and the granularity of prescreening control is 50mm.The on inspection property picking of prescreening oversize, select foreign material and especially big after, enter moving sieve waste stone exhaust system, discharge grade greater than the spoil of 50mm, light product is crushed to granularity less than 50mm, and is mixed into the graded desliming sieve less than 50mm level prescreening screenings.
2. graded desliming: 1 step is entered the material of graded desliming sieve, add recirculated water and carry out the wet classification desliming, removing thin mud less than 0.5～1 mm, to enter dark cone concentrated; Oversize enters coal Jie mixing tank.
3. secondary desliming: 2 steps enter the material of deep cone thickener after concentrating, and underflow carries out the secondary desliming with high-frequency screen, and the high-frequency screen oversize enters coal Jie mixing tank; The overflow of high-frequency screen screenings and deep cone thickener enters the floatation feed pond together.
4. sorting: with the mixture of 3 step coal Jie mixing tanks with feeding separation system, by there being the three-product cyclone of pressure to sub-elect cleaned coal, middle coal and three kinds of products of spoil.
5. dehydration, de-mediated: after having one section the overflow of pressing three-product cyclone to enter head coal sculpingscreen dehydration, de-mediated, oversize reenters behind the cleaned coal centrifugal dehydrator second dehydration as head coal product; Have two sections the overflow of pressing three-product cyclone to enter middle coal sculping screen dehydration, de-mediated, oversize again through in product of coal in the conduct behind the coal centrifuge second dehydration; Have and press two sections underflows of three-product cyclone to enter Coal Stone Separation, after dehydration, the de-mediated as the spoil product.
Medium circulation, reclaim, add system: one section screenings of part head coal sculpingscreen, middle coal and one section screenings of Coal Stone Separation return coal Jie mixing tank as qualified medium and recycle; Feed the magnetic separation of cleaned coal magnetic separator after one section screenings of a part of head coal sculpingscreen and two sections screenings are collected by the rare medium bucket of cleaned coal in addition, middle coal, two sections screenings of Coal Stone Separation feed the magnetic separation of middle cash magnetic separator after being collected by the rare medium bucket of middle cash together, and cleaned coal, that middle cash magnetic separator concentrate all enters coal Jie mixing tank is recycling.After adding medium and adopting qualified magnetite powder thin up to stir, feed coal Jie mixing tank and recycle.
7. coarse slime reclaims: the overflow of the lower black water of 2 step raw coal desliming screens sieve, deep cone thickener and the lower black water of secondary desliming high-frequency screen sieve enter the floatation feed pond together.The magnetic tailing of 6 step cleaned coal magnetic separators and the centrifugate of cleaned coal centrifugal dehydrator enter together vibration sieve bend and carry out coarse slime recovery (perhaps the centrifugate of cleaned coal centrifugal dehydrator enters vibration sieve bend again after the magnetic separation of cleaned coal magnetic separator), and the vibration sieve bend oversize enters coal slime centrifuge and further enters head coal product after the dehydration.The centrifugate of vibration sieve bend backwater and coal slime centrifuge enters the floatation feed pond together, perhaps enters clean coal pressur filter pan feeding pond.The magnetic tailing of cash magnetic separator gravity flow enters vibration sieve bend and carries out coarse slime and reclaim in 6 steps, the oversize of vibration sieve bend screenings and middle coal sculping screen enter together middle coal centrifuge further after the dehydration as in product of coal.It is concentrated that the centrifugate of vibration sieve bend oversize and middle coal centrifuge enters the tail coal thickener together, and the underflow of tail coal thickener reclaims coal slime by the tail coal filter press, and the overflow of tail coal thickener enters circulating water pool, uses as recirculated water.It is concentrated that the filtrate of tail coal filter press enters the tail coal thickener again.
8. separation of fine slime reclaims (floatation system): the black water in floatation feed pond is sent into flotation device equipment, carry out the fine slime sorting, flotation concentrate is reclaimed by clean coal pressur filter pan feeding pond, feed clean coal pressur filter again and carry out the press filtration recovery, floatation clean coal mixes the dense media cleaned coal as final head coal product.It is concentrated that flotation tailing enters the tail coal thickener.Clean coal pressur filter filtrate enters circulating water pool, as recirculated water.
The present invention adds magnetite powder according to factory's type scale and production management actual conditions in system, the quality of magnetite powder of adding should meet national coal separation with the quality requirement of magnetite powder standard "
MT/T 1017-2007 "
Circulating water pool is connected with pipeline with circulation, and circulation is in time given spoil de-mediated, middle coal de-mediated, cleaned coal de-mediated equipment and the moisturizing of coal Jie mixing tank.
Dehydration equipment of the present invention, de-mediated equipment, concentrator, flotation filtering equipment are common apparatus.
For the ease of arranging that dehydration equipment, de-mediated EM equipment module layout that the present invention is used are divided into: graded desliming sorting process functional module system; The sorting process functional module that heavily is situated between system; Black water treatment process functional module system.
The present invention has carried out type approval test in Ci County, Hebei province village coal preparation plant of Shen man, test is used and shown: the more similar factory of total investment of engineering type reduces 30-40%, production cost reduces 40-50%, the efficiency of separation＞95%, construction period≤6 month, the operation of going into operation increases 20,000 ten thousand yuan of economic benefits newly for enterprise then.
Above-described embodiment has only been expressed one embodiment of the present invention, but can not therefore be interpreted as limitation of the scope of the invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (7)
1. graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique, the method comprise prescreening, the pre-discharge refuse of moving sieve, fragmentation; Graded desliming; The secondary desliming; Sorting; Dehydration, de-mediated; Medium circulation, reclaim, add system; Coarse slime reclaims; Separation of fine slime reclaims, and it is characterized in that the concrete operation step of described technique is:
A. prescreening, the pre-discharge refuse of moving sieve, fragmentation: with raw coal prescreening vibratory sieve prescreening, oversize is carried out control hand picking, pick wherein foreign material and especially big after, enter moving sieve waste stone exhaust system and discharge grade greater than the spoil of 50mm, its light product is carried out fragmentation, mix as main shop sorting feed coal with prescreening vibratory sieve screenings;
B. graded desliming: the ready feed coal of a step is entered the desliming screen of main shop, carry out the wet classification desliming, the thin mud that removes less than 0.5～1 mm enters deep cone thickener; Oversize enters coal Jie mixing tank;
C. secondary desliming: the underflow high-frequency screen desliming of b step deep cone thickener, the high-frequency screen oversize enters coal Jie mixing tank; The overflow of high-frequency screen screenings and deep cone thickener enters the floatation feed pond together;
D. sorting: the material of coal Jie mixing tank has entered presses three-product cyclone to carry out sorting, obtains cleaned coal, middle coal, three kinds of products of spoil;
E. dehydration, de-mediated: after the spoil product fed spoil de-mediated equipment, obtain qualified spoil product; Obtain qualified middle coal and head coal product after middle coal and two kinds of products of cleaned coal are fed de-mediated, dehydration equipment successively;
F. medium circulation, reclaim, add system: the cleaned coal of d step, middle coal, three kinds of products of spoil are fed respectively the de-mediated device processes, obtain qualified suspension and dilute suspension, the qualified suspension that obtains directly is recovered in coal Jie mixing tank recycles; The dilute suspension that obtains is fed respectively magnetic separator reclaim, reclaim the magnetic concentrate obtain and enter into coal Jie mixing tank, after adding medium and adopting qualified magnetite powder thin up to stir, feed coal Jie mixing tank and recycle;
G. coarse slime reclaims: overflow and the lower black water of secondary desliming high-frequency screen sieve of the lower black water of b step raw coal desliming screen sieve, deep cone thickener are entered the floatation feed pond together; The magnetic tailing of e step reclaims respectively the coal slime product by vibration sieve bend, coal slime centrifuge integration of operation dehydration; Low ash coal mud is incorporated into the main separation head coal product; Ash coal mud is incorporated into product of coal in the main separation; Cleaned coal vibration sieve bend backwater and coal slime centrifuge centrifugate enter the floatation feed pond, and middle coal vibration sieve bend backwater and middle coal centrifuge centrifugate enter the tail coal thickener;
H. separation of fine slime reclaims: the black water in floatation feed pond feeds flotation device, carries out the fine slime sorting, and flotation concentrate adopts clean coal pressur filter to reclaim cleaned coal mud; Flotation tailing enters the tail coal thickener, and its underflow reclaims tail coal mud with the tail coal filter press, and clean coal pressur filter filtrate, the overflow of tail coal thickener enter circulating water pool together, as full factory cycling use of water; The filtrate of tail coal filter press is returned again concentration and recovery of tail coal thickener.
2. graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique according to claim 1 is characterized in that the screenings of described prescreening is the raw coal of φ 50 ㎜～80mm.
3. graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique according to claim 1 is characterized in that, described vibration desliming screen sieve seam δ=0.5～3mm.
4. graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique according to claim 1 is characterized in that, the magnetic tailing of described dilute suspension adopts vibration sieve bend, coal slime centrifuge integration of operation.
5. graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique according to claim 1 is characterized in that, in desliming step of described wet method, the addition of water and the weight ratio of material are 1:1.5.
6. graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique according to claim 1 is characterized in that described dehydration equipment, de-mediated equipment, concentrator, flotation filtering equipment are common apparatus.
7. graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique according to claim 6 is characterized in that, dehydration equipment, de-mediated EM equipment module layout that described this technique is used are divided into: graded desliming sorting process functional module system; The sorting process functional module that heavily is situated between system; Coarse slime reclaims and separation of fine slime reclaims.
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