CN102179290A - Method for recycling clean coal from high-ash coal slurry tailings - Google Patents
Method for recycling clean coal from high-ash coal slurry tailings Download PDFInfo
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- CN102179290A CN102179290A CN2010106206353A CN201010620635A CN102179290A CN 102179290 A CN102179290 A CN 102179290A CN 2010106206353 A CN2010106206353 A CN 2010106206353A CN 201010620635 A CN201010620635 A CN 201010620635A CN 102179290 A CN102179290 A CN 102179290A
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Abstract
The invention relates to a method for recycling clean coal from high-ash coal slurry tailings, which belongs to the method for recycling the clean coal from the coal slurry tailings. The method is mainly used for solving the technical problem that the existing coal cleaning method can not perform separation on high-ash coal slurry by utilizing the differences in density and particle size. The technical scheme of the invention is as follows: the method for recycling the clean coal from the high-ash coal slurry tailings comprises the following steps: firstly regulating water in the coal slurry to the concentration which is below 30%, using a pump to pump the coal slurry into a material mixing barrel, and enabling the coal slurry to automatically flow into a high-frequency linear vibrating screen for screening so as to realize desliming and coarse cutting-off and separation of the coal slurry, wherein the mesh size of the high-frequency linear vibrating screen is 200-260 meshes; enabling material below the screen after screening and separation by the high-frequency linear vibrating screen to pass through multiple stages of flotation machines connected in series for recycling the clean coal; and adopting nine stages of cyclones connected in series to recycle the clean coal from the material above the screen after screening and separation by the high-frequency linear vibrating screen.
Description
Technical field
The present invention relates to a kind of method that reclaims cleaned coal from dirty coal mud mine tailing again, it belongs to a kind of method that reclaims cleaned coal from the coal slime mine tailing again.
Background technology
At present, China's coal washing industry generally adopts the jigging unit or the unit that heavily is situated between carries out coal separation, and its mine tailing (coal slime) generally adopts flotation device or flotation column to reclaim the mine tailing cleaned coal.Owing to reclaim the technical matters of mine tailing, the configuration imperfection of equipment, for the thinner part of contained raw meal particle size in the coal slime, the technology that employing is carried out sorting according to the difference of the physicochemical properties of mineral surfaces produces little effect, caused waste, also brought bigger economic loss simultaneously to coal washing industry to coal resources.
Summary of the invention
The objective of the invention is to solve the difference that can not utilize density, granularity that existing coal washing method exists is carried out sorting to the ash-rich coal slime technical problem; A kind of method that reclaims cleaned coal from dirty coal mud mine tailing again of utilizing density, particle size differences the ash-rich coal slime to be carried out sorting is provided.
The present invention for the technical scheme that solves above-mentioned technical barrier and adopt is:
A kind of method that from dirty coal mud mine tailing, reclaims cleaned coal again, it comprises the steps: at first black water to be adjusted to the concentration below 30%, throw in the mixing tank also from flowing into high frequency straight line reciprocating sieve with pump, sieve, realization desliming and coal slime are cut crude separation, and the order number of high frequency straight line vibrating screen panel is 200～260 orders;
The undersize material that the screening of high frequency straight line reciprocating sieve separates reclaims cleaned coal through multistage flotation device series connection, the steps include: that high frequency straight line reciprocating sieve undersize material water is pumped into preprocessor carries out medicine mixing stirring: medicine foaming agent and collecting agent are by weight 1: 2-1: 8 ratios add, flowing into the 2# flotation device then roughly selects, the material that 2# flotation device scraper plate scrapes enters 2# material pond, and the material water in the 2# material pond is pumped into the 1# flotation device and carries out selected; The material that the 1# scraper plate scrapes enters in the cleaned coal pond and does discharge through the filter press extrusion and obtains cleaned coal, the ash of cleaned coal≤10%, and 1# flotation device overflow mine tailing flows in the 2# flotation device and selects; Overflow mine tailing in the 2# flotation device flows in the 3# flotation device, and the material that 3# flotation device scraper plate scrapes enters to extract to discharge behind the filter press and obtains electric coal, and the ash of electric coal is about 40～50%;
The overflow tailing stream entry square type overflow launder of 3# flotation device, the material that overflow at horizontal square overflow launder top flows into the floating and feeding pond, entering mixing tank then recycles, the tailing water that flow out its bottom enters thickener and concentrates, the underflow water of thickener enters the filter press dehydration and discharges ash＞75% in institute last person ore deposit;
The oversize material that the screening of high frequency straight line reciprocating sieve separates adopts 9 grades of cyclone series connection to reclaim cleaned coal, the steps include:
High frequency straight line reciprocating sieve oversize material is sent in the 1# medium bucket by conveyer belt, and its concentration adjusted to below 150 grams per liters, by the 1# medium pump material in the 1# medium bucket is sent in the 1# three-product cyclone device then, 1# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 1# three-product cyclone device is discharged advances 9# medium bucket to be handled again;
The material that the middle coal export of 1# three-product cyclone device is discharged enters and carries out cleaned coal in the 2# of the subordinate medium bucket and reclaim; The 2# medium pump is sent into material in the 2# medium bucket in the 2# three-product cyclone device, 2# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 2# three-product cyclone device is discharged enters 9# medium bucket and handles;
The material that the middle coal export of 2# three-product cyclone device is discharged enters next stage 3# medium bucket to carry out cleaned coal and reclaims, the 3# medium pump is sent into material in the 3# medium bucket in the 3# three-product cyclone device, 3# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 3# three-product cyclone device is discharged enters 9# medium bucket and handles;
The material that the middle coal export of 3# three-product cyclone device is discharged enters next stage 4# medium bucket to carry out cleaned coal and reclaims, the 4# medium pump is sent into material in the 4# medium bucket in the 4# three-product cyclone device, 4# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 4# three-product cyclone device is discharged advances 5# medium bucket to be handled again;
The material that the middle coal export of 4# three-product cyclone device is discharged enters next stage 5# medium bucket to carry out cleaned coal and reclaims, the 5# medium pump is sent into material in the 5# medium bucket in the 5# three-product cyclone device, 5# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 5# three-product cyclone device is discharged enters 6# medium bucket and handles;
The material that the middle coal export of 5# three-product cyclone device is discharged enters next stage 6# medium bucket to carry out cleaned coal and reclaims, the 6# medium pump is sent into material in the 6# medium bucket in the 6# three-product cyclone device, 6# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 6# three-product cyclone device is discharged advances 7# medium bucket to be handled again;
The material that the middle coal export of 6# three-product cyclone device is discharged enters next stage 7# medium bucket to carry out cleaned coal and reclaims, the 7# medium pump is sent into material in the 7# medium bucket in the 7# three-product cyclone device, 7# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 7# three-product cyclone device is discharged advances 8# medium bucket to be handled again;
The material that the middle coal export of 7# three-product cyclone device is discharged enters next stage 8# medium bucket to carry out cleaned coal and reclaims, the 8# medium pump is sent into material in the 8# medium bucket in the 8# three-product cyclone device, 8# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 8# three-product cyclone device is discharged advances 9# medium bucket to be handled again;
The material that the middle coal export of 8# three-product cyclone device is discharged enters the dehydration of high frequency straight line reciprocating sieve, obtains cleaned coal, gained cleaned coal ash≤10%; The 9# medium pump is sent into material in the 9# medium bucket in the 9# three-product cyclone device, and 9# three-product cyclone device cleaned coal outlet overflow water enters mixing tank, and the middle coal export material of 9# three-product cyclone device enters 1# medium bucket and selects; Cash dewatering screen during the mine tailing material that the spoil outlet of 9# three-product cyclone device is discharged enters, oversize material are middle cash electricity coal, and undersize material enters mixing tank and handles.
The present invention is through the coal washery experiment of number man, shows that the present invention has high-recovery and advantage cheaply.Following table is to have adopted the present invention to increase substantially the ratio that cleaned coal reclaims in the mine tailing coal slime between certain coal washery mine tailing recovery vehicle.Prove that through production practices the present invention can reclaim 38.42 tons of the cleaned coal of ash＜10.2% from ash is 46% 200.7 tons coal slime, reclaim 40.71 tons of the floatation clean coals of ash＜10.6%; Reclaim 6.2 tons of magnetic iron powders; Cash electricity coal is 52 tons in the recovery ash 40～50%; Remaining is 63.37 tons of the mine tailing of ash about 70%.
Certain coal washery mine tailing rate of recovery
Description of drawings
Accompanying drawing is a process chart of the present invention.
The specific embodiment
As shown in drawings, a kind of method that from dirty coal mud mine tailing, reclaims cleaned coal again in the present embodiment, it comprises the steps: at first black water to be adjusted to the concentration below 30%, throw in the mixing tank also from flowing into high frequency straight line reciprocating sieve with pump, sieve, realization desliming and coal slime are cut crude separation, and the order number of high frequency straight line vibrating screen panel is 200 orders;
The undersize material that the screening of high frequency straight line reciprocating sieve separates reclaims cleaned coal through multistage flotation device series connection, the steps include: that high frequency straight line reciprocating sieve undersize material water is pumped into preprocessor carries out medicine mixing stirring: medicine foaming agent and collecting agent add by weight 1: 2 ratio, flowing into the 2# flotation device then roughly selects, the material that 2# flotation device scraper plate scrapes enters 2# material pond, and the material water in the 2# material pond is pumped into the 1# flotation device and carries out selected; The material that the 1# scraper plate scrapes enters in the cleaned coal pond and does discharge through the filter press extrusion and obtains cleaned coal, the ash of cleaned coal≤10%, and 1# flotation device overflow mine tailing flows in the 2# flotation device and selects; Overflow mine tailing in the 2# flotation device flows in the 3# flotation device, and the material that 3# flotation device scraper plate scrapes enters to extract to discharge behind the filter press and obtains electric coal, and the ash of electric coal is about 40～50%;
The overflow tailing stream entry square type overflow launder of 3# flotation device, the material that overflow at horizontal square overflow launder top flows into the floating and feeding pond, entering mixing tank then recycles, the tailing water that flow out its bottom enters thickener and concentrates, the underflow water of thickener enters the filter press dehydration and discharges ash＞75% in institute last person ore deposit;
The oversize material that the screening of high frequency straight line reciprocating sieve separates adopts 9 grades of cyclone series connection to reclaim cleaned coal, the steps include:
High frequency straight line reciprocating sieve oversize material is sent in the 1# medium bucket by conveyer belt, and its concentration adjusted to below 150 grams per liters, by the 1# medium pump material in the 1# medium bucket is sent in the 1# three-product cyclone device then, 1# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 1# three-product cyclone device is discharged advances 9# medium bucket to be handled again;
The material that the middle coal export of 1# three-product cyclone device is discharged enters and carries out cleaned coal in the 2# of the subordinate medium bucket and reclaim; The 2# medium pump is sent into material in the 2# medium bucket in the 2# three-product cyclone device, 2# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 2# three-product cyclone device is discharged enters 9# medium bucket and handles;
The material that the middle coal export of 2# three-product cyclone device is discharged enters next stage 3# medium bucket to carry out cleaned coal and reclaims, the 3# medium pump is sent into material in the 3# medium bucket in the 3# three-product cyclone device, 3# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 3# three-product cyclone device is discharged enters 9# medium bucket and handles;
The material that the middle coal export of 3# three-product cyclone device is discharged enters next stage 4# medium bucket to carry out cleaned coal and reclaims, the 4# medium pump is sent into material in the 4# medium bucket in the 4# three-product cyclone device, 4# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 4# three-product cyclone device is discharged advances 5# medium bucket to be handled again;
The material that the middle coal export of 4# three-product cyclone device is discharged enters next stage 5# medium bucket to carry out cleaned coal and reclaims, the 5# medium pump is sent into material in the 5# medium bucket in the 5# three-product cyclone device, 5# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 5# three-product cyclone device is discharged enters 6# medium bucket and handles;
The material that the middle coal export of 5# three-product cyclone device is discharged enters next stage 6# medium bucket to carry out cleaned coal and reclaims, the 6# medium pump is sent into material in the 6# medium bucket in the 6# three-product cyclone device, 6# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 6# three-product cyclone device is discharged advances 7# medium bucket to be handled again;
The material that the middle coal export of 6# three-product cyclone device is discharged enters next stage 7# medium bucket to carry out cleaned coal and reclaims, the 7# medium pump is sent into material in the 7# medium bucket in the 7# three-product cyclone device, 7# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 7# three-product cyclone device is discharged advances 8# medium bucket to be handled again;
The material that the middle coal export of 7# three-product cyclone device is discharged enters next stage 8# medium bucket to carry out cleaned coal and reclaims, the 8# medium pump is sent into material in the 8# medium bucket in the 8# three-product cyclone device, 8# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 8# three-product cyclone device is discharged advances 9# medium bucket to be handled again;
The material that the middle coal export of 8# three-product cyclone device is discharged enters the dehydration of high frequency straight line reciprocating sieve, obtains cleaned coal, gained cleaned coal ash≤10%; The 9# medium pump is sent into material in the 9# medium bucket in the 9# three-product cyclone device, and 9# three-product cyclone device cleaned coal outlet overflow water enters mixing tank, and the middle coal export material of 9# three-product cyclone device enters 1# medium bucket and selects; Cash dewatering screen during the mine tailing material that the spoil outlet of 9# three-product cyclone device is discharged enters, oversize material are middle cash electricity coal, and undersize material enters mixing tank and handles.
The order number of the high frequency straight line vibrating screen panel in the present embodiment is 260 orders, and medicine foaming agent and collecting agent add by weight 1: 8 ratio, all the other with embodiment 1 in identical.
The order number of the high frequency straight line vibrating screen panel in the present embodiment is 240 orders, and medicine foaming agent and collecting agent add by weight 1: 6 ratio, all the other with embodiment 1 in identical.
The order number of the high frequency straight line vibrating screen panel in the present embodiment is 220 orders, and medicine foaming agent and collecting agent add by weight 1: 4 ratio, all the other with embodiment 1 in identical.
The order number of the high frequency straight line vibrating screen panel in the present embodiment is 220 orders, and medicine foaming agent and collecting agent add by weight 1: 5 ratio, all the other with embodiment 1 in identical.
Claims (1)
1. method that from dirty coal mud mine tailing, reclaims cleaned coal again, it is characterized in that: comprise the steps: at first black water to be adjusted to the concentration below 30%, throw in the mixing tank also from flowing into high frequency straight line reciprocating sieve with pump, sieve, realization desliming and coal slime are cut crude separation, and the order number of high frequency straight line vibrating screen panel is 200～260 orders;
The undersize material that the screening of high frequency straight line reciprocating sieve separates reclaims cleaned coal through multistage flotation device series connection, the steps include: that high frequency straight line reciprocating sieve undersize material water is pumped into preprocessor carries out medicine mixing stirring: medicine foaming agent and collecting agent are by weight 1: 2-1: 8 ratios add, flowing into the 2# flotation device then roughly selects, the material that 2# flotation device scraper plate scrapes enters 2# material pond, and the material water in the 2# material pond is pumped into the 1# flotation device and carries out selected; The material that the 1# scraper plate scrapes enters in the cleaned coal pond and does discharge through the filter press extrusion and obtains cleaned coal, the ash of cleaned coal≤10%, and 1# flotation device overflow mine tailing flows in the 2# flotation device and selects; Overflow mine tailing in the 2# flotation device flows in the 3# flotation device, and the material that 3# flotation device scraper plate scrapes enters to extract to discharge behind the filter press and obtains electric coal, and the ash of electric coal is about 40～50%;
The overflow tailing stream entry square type overflow launder of 3# flotation device, the material that overflow at horizontal square overflow launder top flows into the floating and feeding pond, entering mixing tank then recycles, the tailing water that flow out its bottom enters thickener and concentrates, the underflow water of thickener enters the filter press dehydration and discharges ash＞75% in institute last person ore deposit;
The oversize material that the screening of high frequency straight line reciprocating sieve separates adopts 9 grades of cyclone series connection to reclaim cleaned coal, the steps include:
High frequency straight line reciprocating sieve oversize material is sent in the 1# medium bucket by conveyer belt, and its concentration adjusted to below 150 grams per liters, by the 1# medium pump material in the 1# medium bucket is sent in the 1# three-product cyclone device then, 1# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 1# three-product cyclone device is discharged advances 9# medium bucket to be handled again;
The material that the middle coal export of 1# three-product cyclone device is discharged enters and carries out cleaned coal in the 2# of the subordinate medium bucket and reclaim; The 2# medium pump is sent into material in the 2# medium bucket in the 2# three-product cyclone device, 2# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 2# three-product cyclone device is discharged enters 9# medium bucket and handles;
The material that the middle coal export of 2# three-product cyclone device is discharged enters next stage 3# medium bucket to carry out cleaned coal and reclaims, the 3# medium pump is sent into material in the 3# medium bucket in the 3# three-product cyclone device, 3# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 3# three-product cyclone device is discharged enters 9# medium bucket and handles;
The material that the middle coal export of 3# three-product cyclone device is discharged enters next stage 4# medium bucket to carry out cleaned coal and reclaims, the 4# medium pump is sent into material in the 4# medium bucket in the 4# three-product cyclone device, 4# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 4# three-product cyclone device is discharged advances 5# medium bucket to be handled again;
The material that the middle coal export of 4# three-product cyclone device is discharged enters next stage 5# medium bucket to carry out cleaned coal and reclaims, the 5# medium pump is sent into material in the 5# medium bucket in the 5# three-product cyclone device, 5# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 5# three-product cyclone device is discharged enters 6# medium bucket and handles;
The material that the middle coal export of 5# three-product cyclone device is discharged enters next stage 6# medium bucket to carry out cleaned coal and reclaims, the 6# medium pump is sent into material in the 6# medium bucket in the 6# three-product cyclone device, 6# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 6# three-product cyclone device is discharged advances 7# medium bucket to be handled again;
The material that the middle coal export of 6# three-product cyclone device is discharged enters next stage 7# medium bucket to carry out cleaned coal and reclaims, the 7# medium pump is sent into material in the 7# medium bucket in the 7# three-product cyclone device, 7# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 7# three-product cyclone device is discharged advances 8# medium bucket to be handled again;
The material that the middle coal export of 7# three-product cyclone device is discharged enters next stage 8# medium bucket to carry out cleaned coal and reclaims, the 8# medium pump is sent into material in the 8# medium bucket in the 8# three-product cyclone device, 8# three-product cyclone device cleaned coal outlet overflow water enters the dehydration of high frequency straight line reciprocating sieve, obtain cleaned coal, gained cleaned coal ash≤10%, the mine tailing that the spoil outlet of 8# three-product cyclone device is discharged advances 9# medium bucket to be handled again;
The material that the middle coal export of 8# three-product cyclone device is discharged enters the dehydration of high frequency straight line reciprocating sieve, obtains cleaned coal, gained cleaned coal ash≤10%; The 9# medium pump is sent into material in the 9# medium bucket in the 9# three-product cyclone device, and 9# three-product cyclone device cleaned coal outlet overflow water enters mixing tank, and the middle coal export material of 9# three-product cyclone device enters 1# medium bucket and selects; Cash dewatering screen during the mine tailing material that the spoil outlet of 9# three-product cyclone device is discharged enters, oversize material are middle cash electricity coal, and undersize material enters mixing tank and handles.
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| CN2010106206353A CN102179290A (en) | 2010-12-31 | 2010-12-31 | Method for recycling clean coal from high-ash coal slurry tailings |
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| CN103212479A (en) * | 2013-05-02 | 2013-07-24 | 杨高灵 | Tail coal recycling utilization |
| CN103752414A (en) * | 2014-01-07 | 2014-04-30 | 中国矿业大学(北京) | Pulp mixing reinforced deep flotation technology process |
| CN103831163A (en) * | 2012-11-20 | 2014-06-04 | 辽宁工程技术大学 | Pre-separation process of coal slime flotation |
| CN108855645A (en) * | 2017-05-12 | 2018-11-23 | 杨林 | A kind of smalls coarse slime classification and sorting unit |
| CN108855579A (en) * | 2017-05-12 | 2018-11-23 | 杨林 | A kind of method of hydrocyclone coal separation |
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| CN108855579A (en) * | 2017-05-12 | 2018-11-23 | 杨林 | A kind of method of hydrocyclone coal separation |
| CN108855645B (en) * | 2017-05-12 | 2020-07-28 | 山西世纪新龙腾科技有限公司 | Fine coal coarse slime grading and sorting unit |
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Application publication date: 20110914 |