CN1864802A - Process for dehydrating floatation coal - Google Patents
Process for dehydrating floatation coal Download PDFInfo
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- CN1864802A CN1864802A CN 200610012630 CN200610012630A CN1864802A CN 1864802 A CN1864802 A CN 1864802A CN 200610012630 CN200610012630 CN 200610012630 CN 200610012630 A CN200610012630 A CN 200610012630A CN 1864802 A CN1864802 A CN 1864802A
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- coal
- filter
- pressing filter
- tail
- dehydrating
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Abstract
The invention relates to a process of dewatering flotation tailings, belonging to field of solid-liquid separation. The invention is characterized in that said process comprises: feeding preparation, pressure filter dewatering, recycling filter liquor and recycling filter cake; the ash of flotation tailings is less than 55%, concentration is between 250-400 g/l, granular size is smaller than 200 mu and content is less than 40%, working pressure of pressure filter is 0.4-0.5 Mpa, pressure of counter air blowing is 0.04-0.1 Mpa, air consumption is 0.68-1.02 m3/m2*min, water content of filter cake is 14-20%. The invention is characterized by simple process, low water content in product, and good economic and social benefit.
Description
Technical field
The present invention relates to a kind of method of handling tail coal, particularly adopt pressing filter that floating tail-coal is carried out the process of processed, belong to the solid-liquid separation technique field.
Background technology
Flotation is the effective and the most the most frequently used a kind of method of present fine slime sorting.Coal slime or the byproduct of floating tail-coal after as the flotation sorting, after traditional handicraft processing or dehydration, because of the moisture height, caloric value is lower, uses for industry and brings difficulty, therefore, adopt novel, dehydrating floatation coal technology efficiently, can improve the added value of floating tail-coal, reduce energy waste, improve the coal separation economic benefit of enterprises, can also solve the problem of environmental pollution that brings in the tail coal processing procedure." realize the clear water coal washing, reach in the coal slime factory and reclaim, the wash water closed cycle, the conserve water resource is generated profit maximization " be the target that each coal preparation plant is pursued.Present dehydrating floatation coal treatment process has following several, i.e. filter press processing, sedimentation filtering centrifuge-filter press process integration, coal slime centrifuge-filter press process integration.Filter press is the dewatering process of conventional process floating tail-coal, and adaptability is strong, but the separate unit disposal ability is little, and product moisture is higher, and it is block that filter cake is, and can't be incorporated into to wash in the end in coal or other thermal coal.Sedimentation filtering centrifuge-filter press process integration and coal slime centrifuge-filter press process integration also all exist product moisture height, system complex, floating tail-coal can't be incorporated into the shortcoming of washing coal in the end.Product to this relative granularity of floating tail-coal is thin partially, ash content is high, viscosity is big reduces contained humidity (below 20%), is the key issue of floating tail-coal comprehensive utilization.
Summary of the invention
Problem to be solved by this invention provides a kind of low input, high production, technology is simple, automaticity is high utilizes the process of pressing filter to dehydrating floatation coal, adopts this method to handle floating tail-coal filter cake moisture and is lower than 20%.
The alleged problem of the present invention is solved by following technical scheme:
A kind of process of dehydrating floatation coal, its special feature is: it utilizes pressing filter to handle floating tail-coal, and described method is made up of following operation:
A. pan feeding is prepared: floating tail-coal concentrates through thickener, and underflow is squeezed into pressing filter through coal slurry pump and gone into charging basket, pan feeding concentration: 250-400g/l;
B. pressing filter dehydration: pressing filter is gone into the floating tail-coal through concentrating in the charging basket, pumps into the pressing filter processed by the pan feeding pump, pressing filter operating pressure: 0.4-0.5mpa, counter-blowing wind-pressure power: 0.04-0.10mpa; Blast consumption: 0.68～1.02m
3/ m
2.min.
C. filtrate is reclaimed: pressing filter filtrate is returned the tail coal thickener or is done recirculated water with the overflow of floating tail-coal thickener and use, and the filtrate solids content is less than 20g/l;
D. filter cake reclaims: filter cake moisture 14-20%, the material shape that becomes to loose, mix in the end in coal or other thermal coal and use as thermal coal.
The process of above-mentioned dehydrating floatation coal, described floating tail-coal material size is lower than 40% less than 200 purpose content, and the floating tail-coal ash content is less than 55%.
The process of above-mentioned dehydrating floatation coal, described pressing filter filter cloth aperture is 55-83 μ m.
The inventive method is carried out labor by effect and the operating position of pressing filter being handled floatation clean coal, primary slime, formulated one and overlapped the technological parameter that is applicable to dehydrating floatation coal, show through a large amount of half type approval tests and result of industrial test, the floating tail-coal filter cake moisture that adopts this method processing is at 14-20%, material becomes diffusing shape, can be incorporated in the end in coal or other thermal coal and use as thermal coal, the filtrate solids content can directly be done recirculated water and use below 20g/l.The present invention adopts pressing filter to handle the blank that floating tail-coal technology has been filled up this technical finesse floating tail-coal of domestic and international use, found the new way of dehydrating floatation coal, solve black water and effluxed the environmental problem brought and the problem of coal slime comprehensive utilization, propose a kind of low input high production, technology is simple, automaticity is high floating tail-coal treatment process method, have good economic benefit and social benefit.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Pressing filter is the effective ways that are used for floatation clean coal, primary slime dehydration and solid material is reclaimed, have the automation degree of equipment height, disposal ability is big, system is simple, low (free moisture is below 20% for product moisture, generally 18%), material is characteristics such as the shape that looses, but is not used in the precedent of handling floating tail-coal at present both at home and abroad.The concrete characteristics of floating tail-coal are: the ash content height, more than 40%; In pulp tank, easily precipitate; Viscosity is big, easily stops up filter cloth; Granularity is thin partially, and strainability is poor.These characteristics according to floating tail-coal, analyze pressing filter and handle floatation clean coal, the effect of primary slime and operating position, each technological parameter has been carried out contrast repeatedly, determine pan feeding concentration, operating pressure, use air quantity, parameters such as counter-blowing wind-pressure power and material size, and a large amount of half industrialness have been done, type approval test, result of the test shows, the floating tail-coal that adopts process of the present invention to handle reaches re-set target, and filter cake moisture is at 14-20%, average 15.94%, the material shape that become to loose can be incorporated in the end in coal or other thermal coal, and the filtrate solids content is below 20g/l, can directly do recirculated water and use, favorable economic benefit and social benefit are arranged.For disposal ability is the coal preparation plant of 400mt/a, and year wound benefit is more than 1,000 ten thousand yuan.Provide a specific embodiment below in conjunction with accompanying drawing 1.
Pan feeding is prepared: the floating tail-coal ash content is less than 55%, and granularity is lower than 40% less than 200 order content.Floating tail-coal is after thickener concentrates, and concentration reaches 250-400g/l, and underflow is squeezed into pressing filter through coal slurry pump and gone into charging basket.Can monitor, regularly in time measure tail coal concentration by densimeter is installed, but coal slurry pump distribution transforming frequency speed regulator be adjusted pan feeding concentration, to guarantee the concentration requirement of 250-400g/l with methods such as concentration kettle measurements.Pressing filter is gone into charging basket should be provided with agitating device, stirs as high-pressure blast or high-pressure flush, and to avoid the bulky grain precipitation, the floating tail-coal after concentrating of going in the charging basket is squeezed into pressing filter by pressing filter pan feeding pump again.
The pressing filter dehydration: the pressing filter dehydration is a critical process of the present invention, consider the special nature of floating tail-coal, selected operating pressure far above floatation clean coal, counter-blowing wind-pressure power and the bigger air quantity of using for use, operating pressure is 0.4-0.5mpa, and counter-blowing wind-pressure power is 0.04-0.10mpa; Blast consumption is 0.68-1.02m
3/ m
2.min.The HBF-S120/10 pressing filter that present embodiment selects for use 1 Andritz OY to produce is equipped with 3 SA-250A and contains pressure fan (capacity 42m again
3/ min), open the car stage, because of blast consumption is big, 3 typhoon machines are opened air-supply simultaneously, treat that operation is normal after, can stop a typhoon machine, keep normal operation by two typhoon machines.In the equipment running process, in time adjust the speed of mainshaft according to becoming the cake situation, adjusting range is 0.5-3.0rpm.
Pressing filter filter cloth aperture is 55-83 μ m, and the filter fan adopts stainless steel filter fan.
Filter cake reclaims: after the processed, the filter cake discharge way adopts blowback wind and scraper discharging to combine, and filter cake moisture 14-20%, the material shape that becomes to loose mixes in the end in coal or other thermal coal and recycles.
Filtrate is reclaimed: pressing filter filtrate can be returned the tail coal thickener, also can do recirculated water with the overflow of floating tail-coal thickener and use, and the filtrate solids content is less than 20g/l.
Subordinate list 1 and subordinate list 2 are present embodiment pan feeding and filter cake granularmetric composition.
Subordinate list 1 floating tail-coal granularmetric composition
| Particle size fraction (order) | Productive rate (%) | Ash content (%) |
| +20 | 2.82 | 31.92 |
| 20-40 | 21.77 | 37.17 |
| 40-60 | 16.94 | 39.65 |
| 60-80 | 12.90 | 38.94 |
| 80-100 | 8.06 | 38.32 |
| 100-120 | 6.45 | 37.58 |
| 120-140 | 9.27 | 46.13 |
| 140-180 | 5.65 | 45.89 |
| 180-200 | 6.45 | 45.29 |
| 200-325 | 4.03 | 51.71 |
| -325 | 5.65 | 52.69 |
| Add up to | 100.00 | 41.10 |
Subordinate list 2 filter cake granularmetric compositions
| Particle size fraction (order) | Productive rate (%) | Ash content (%) |
| +20 | 1.21 | 37.08 |
| 20-40 | 11.69 | 37.20 |
| 40-60 | 10.89 | 40.00 |
| 60-80 | 16.94 | 40.41 |
| 80-100 | 7.26 | 39.03 |
| 100-120 | 5.65 | 37.91 |
| 120-140 | 7.26 | 36.88 |
| 140-180 | 5.24 | 36.30 |
| 180-200 | 10.08 | 37.24 |
| 200-325 | 0.28 | 50.41 |
| -325 | 23.51 | 46.10 |
| Add up to | 100.00 | 40.28 |
Claims (4)
1. the process of a dehydrating floatation coal is characterized in that: it utilizes pressing filter to handle floating tail-coal, and described method is made up of following operation:
A. pan feeding is prepared: floating tail-coal concentrates through thickener, and underflow is squeezed into pressing filter through coal slurry pump and gone into charging basket, pan feeding concentration: 250-400g/l;
B. pressing filter dehydration: pressing filter is gone into the floating tail-coal through concentrating in the charging basket, pumps into the pressing filter processed by the pan feeding pump, pressing filter operating pressure: 0.4-0.5mpa, counter-blowing wind-pressure power: 0.04-0.10mpa; Blast consumption: 0.68～1.02m
3/ m
2.min.
C. filtrate is reclaimed: pressing filter filtrate is returned the tail coal thickener, or does recirculated water with the overflow of tail coal thickener and use, and the filtrate solids content is less than 20g/l;
D. filter cake reclaims: filter cake moisture 14-20%, the material shape that becomes to loose, mix in the end in coal or other thermal coal and use.
2. the process of dehydrating floatation coal according to claim 1, it is characterized in that: described floating tail-coal material size is lower than 40% less than 200 purpose content, and the floating tail-coal ash content is less than 55%.
3. the process of dehydrating floatation coal according to claim 2, it is characterized in that: described pressing filter filter cloth aperture is 55-83 μ m.
4. according to the process of claim 1 or 2 or 3 described dehydrating floatation coals, it is characterized in that: described pressing filter is gone into charging basket and is provided with high-pressure blast or high-pressure flush agitating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100126306A CN100391574C (en) | 2006-04-25 | 2006-04-25 | Process for dehydrating floatation coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100126306A CN100391574C (en) | 2006-04-25 | 2006-04-25 | Process for dehydrating floatation coal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1864802A true CN1864802A (en) | 2006-11-22 |
| CN100391574C CN100391574C (en) | 2008-06-04 |
Family
ID=37424041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100126306A Expired - Fee Related CN100391574C (en) | 2006-04-25 | 2006-04-25 | Process for dehydrating floatation coal |
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|---|---|
| CN (1) | CN100391574C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500472A (en) * | 2011-10-19 | 2012-06-20 | 中国矿业大学 | Concentrating, filtering and dehydrating process for flotation clean coal |
| CN102699013A (en) * | 2012-05-09 | 2012-10-03 | 山东莱芜煤矿机械有限公司 | Pulverized fuel ash comprehensive treatment technique |
| CN103993158A (en) * | 2014-06-06 | 2014-08-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process and system for removing alkali metals out of iron and steel making fly ash |
| CN105498981A (en) * | 2016-02-23 | 2016-04-20 | 中国矿业大学 | High-carbon coal ash flotation and carbon removal technology with foam stabilizing characteristic |
| CN106362480A (en) * | 2016-11-24 | 2017-02-01 | 官景梁 | Efficient filtering method of concentrate pulp |
| CN108855586A (en) * | 2017-05-12 | 2018-11-23 | 杨林 | A kind of Unit erriger of coal floatation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63116760A (en) * | 1986-10-31 | 1988-05-21 | Babcock Hitachi Kk | Method for deashing coal |
| JP3580868B2 (en) * | 1994-08-18 | 2004-10-27 | 太平洋セメント株式会社 | Coal ash treatment method |
| CN1245740A (en) * | 1999-06-28 | 2000-03-01 | 李宗华 | Refloatation method of fly-ash and refuse and its technological process |
| CN1297334C (en) * | 2004-05-20 | 2007-01-31 | 周明远 | Thermal pressure filtration process for deep dehydration of fine coal suspension liquid and apparatus therefor |
-
2006
- 2006-04-25 CN CNB2006100126306A patent/CN100391574C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500472A (en) * | 2011-10-19 | 2012-06-20 | 中国矿业大学 | Concentrating, filtering and dehydrating process for flotation clean coal |
| CN102699013A (en) * | 2012-05-09 | 2012-10-03 | 山东莱芜煤矿机械有限公司 | Pulverized fuel ash comprehensive treatment technique |
| CN102699013B (en) * | 2012-05-09 | 2015-01-21 | 山东莱芜煤矿机械有限公司 | Pulverized fuel ash comprehensive treatment technique |
| CN103993158A (en) * | 2014-06-06 | 2014-08-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process and system for removing alkali metals out of iron and steel making fly ash |
| CN105498981A (en) * | 2016-02-23 | 2016-04-20 | 中国矿业大学 | High-carbon coal ash flotation and carbon removal technology with foam stabilizing characteristic |
| CN106362480A (en) * | 2016-11-24 | 2017-02-01 | 官景梁 | Efficient filtering method of concentrate pulp |
| CN108855586A (en) * | 2017-05-12 | 2018-11-23 | 杨林 | A kind of Unit erriger of coal floatation |
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| Publication number | Publication date |
|---|---|
| CN100391574C (en) | 2008-06-04 |
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Granted publication date: 20080604 Termination date: 20100425 |