CN102430481B - Sorting process for high-ash and difficult-separation coal slime - Google Patents
Sorting process for high-ash and difficult-separation coal slime Download PDFInfo
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- CN102430481B CN102430481B CN 201110317595 CN201110317595A CN102430481B CN 102430481 B CN102430481 B CN 102430481B CN 201110317595 CN201110317595 CN 201110317595 CN 201110317595 A CN201110317595 A CN 201110317595A CN 102430481 B CN102430481 B CN 102430481B
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Abstract
Disclosed is sorting process for high-ash and difficult-separation coal slime. Floatation coal slime is fed into a stirring barrel to be prepared into ore pulp with percentage concentration of 80g/L-120g/L, the ore pulp automatically flows to roughing and floatation equipment to be sorted, roughing tail coal enters a cyclone to be concentrated in a classified manner, concentrated bottom flow products enter a high-frequency screen to be dewatered, dewatered substances on the high-frequency screen return to roughing pulp mixing operation to be sorted again after being finely ground via a ball mill, floatation rough and fine ores are fed to a precipitation perforated basket centrifuge to be dewatered, after being dewatered via the precipitation perforated basket centrifuge, fine ore filter liquor is fed into concentration flotation equipment to be concentrated, and concentration tail coal and overflow of the ball mill return to roughing pulp mixing operation together via a pipeline to be sorted again. Accordingly, low-ash and high-recovery-rate flotation clean coal is obtained. The sorting process not only avoids influence of high-ash content and fine particle slime and integrated ore to a floatation process, but also avoids contradiction between the quality and the recovery rate of a high-ash difficult-separation coal slime sorted product.
Description
Technical field
The present invention relates to the sorting process of coal slime, especially a kind ofly be applicable to roughly select the cleaned coal fine grinding again sorting process of the high grey difficult separation coal mud of choosing that dissociates.
Background technology
Along with maximizing, deterioration, the coal preparation plant of the raising of Mechanized Coal Mining Operation in China degree, Resource geology condition build and the extensive use of dense medium separation technology, high grey difficult separation coal mud ratio sharply increases, and its characteristics are mainly manifested in that coal content is large in the coal slime, ash content is high, fine size, the poor several respects of washability.Wherein particularly-200 the fine coal content of purpose increases, often ash content is higher because the thin mud of high ash is carried secretly to cause floatation clean coal, the coarse granule intergrowth also produces interference to floatation process, the ash content of intergrowth mineral is general and coal ash is approaching, ratio accounts for about 20% of raw coal, the intergrowth part is as entering the cleaned coal part, then pollute cleaned coal, if the intergrowth part does not reclaim, enter the tail coal part, then so that the tail coal part is on the low side, so the sorting problem of thin sludge-polluted and intergrowth mineral has become the key factor of the final head coal product quality of serious restriction.Patent announcement number is: a kind of slime separation technique of CN101757982A, consider that the intergrowth mineral are on the impact of flotation recovery rate, taked the dissociate technique of again flotation of intergrowth ore grinding, this technique can improve clean coal recovery, but the thin cement content of the product after levigate increases, and is easy to pollute cleaned coal, and cleans ash is difficult to be guaranteed, so this arts demand is further perfect, particularly to take measures aspect the control of quality of cleaned coal.
Conventional flotation process is that floatation feed is sent into flotation column (or flotation device) after the ore pulp preprocessor is processed, and flotation column (or flotation device) sub-elects concentrate and tailings, and enters subsequent product processing operation separately.This technique mainly is applicable to the conventional easily sorting of coal separation mud, be widely used in China, but for the grey difficult separation coal mud of height, this technique exists product recovery rate and the low defective of production efficiency, be difficult to solve the thin mud of high ash and carry secretly and the impact of intergrowth mineral on floatation process, become a difficult problem needing solution in the coal resources efficient clean utilization process badly therefore develop the key technology of the grey difficult separation coal mud of adaptive height efficient separation.
Summary of the invention
Technical problem: the present invention seeks to overcome the weak point in the prior art, in provide a kind of low cost, technique rationally, the floatation process of the high grey difficult separation coal mud sorting of high, the remarkable in economical benefits of small investment, the efficiency of separation.
Technical scheme: the sorting process of the high grey difficult separation coal mud of the present invention, comprise that the float coal mud that enters that will be furnished with floating agent feeds in the agitator, after the impeller strong stirring is even, make the ore pulp that mass percent concentration is 80 g/L～120g/L; The pulp gravity flow for preparing enters to be roughly selected floatation equipment and carries out sorting, obtains the thick cleaned coal of flotation and roughly selects tail coal; Roughly selecting tail coal enters cyclone to carry out classification concentrated, carry out the concentrated underflow product of classification through cyclone and enter the high-frequency screen dehydration, the oversize of high-frequency screen dehydration enters to return after the ball mill fine grinding roughly selects the again sorting of operation of sizing mixing, the underflow of cyclone and the screenings of high-frequency screen are final tail coal, the thick cleaned coal of described flotation fed in the screen-bowl centrifuge dewater, after the screen-bowl centrifuge dehydration, obtain head coal product and cleaned coal filtrate, cleaned coal filtrate is fed selected floatation equipment carries out selected, obtain head coal product and selected tail coal, selected tail coal and ball mill overflow are returned by the road in the lump and are roughly selected the operation of sizing mixing, and carry out again sorting.
The described floatation equipment of roughly selecting adopts the two-part flotation basin; Described selected floatation equipment adopts flotation column or flotation device.
Beneficial effect: the present invention by ore pulp modulation, coal slime flotation equipment roughly select, thick cleaned coal dehydration rear filtrate is selected, the method for rough coal Dewatering regrinding and reconcentration, obtains low ash content, high-recovery floatation clean coal with this.Use flotation column or flotation device to roughly select-thick cleaned coal dehydration rear filtrate is selected-roughly select the efficient separation that tail coal regrinding and reconcentration sorting process is realized high grey difficult separation coal mud, not only solve the thin mud of high ash and carried secretly and the impact of intergrowth mineral on floatation process, and solved contradiction between high grey difficult separation coal mud sorted product quality and the rate of recovery.Intergrowth mineral and thin mud entrainment problem be can solve simultaneously, quality of cleaned coal and the rate of recovery improved.Its major advantage:
A, by concentrated classification and dewatering operation, the intergrowth of roughly selecting low ash in the tail coal is separated, impact in the ball mill between steel ball and abrasive action make to roughly select and connect the health mineral in the tail coal and fully dissociated, and have discharged the cleaned coal in the intergrowth mineral, have improved the floatation clean coal rate of recovery;
B, the high grey particulate filtrate part that will roughly select cleaned coal by screen-bowl centrifuge separate with the dry thing of thick cleaned coal, and high grey fine fraction continuation is selected, and the selected operation of filtrate has reduced the thin mud of high ash to the pollution of cleaned coal;
C, this technological process are reasonable, small investment, and power consumption is little, and operating cost is low.Compare with traditional sorting process, the efficiency of separation is high, remarkable in economical benefits.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Fig. 2 is process flow system figure of the present invention.
Among the figure: 1-enters float coal mud, the 2-floating agent, the 3-floatation feed, 4-roughly selects cleaned coal, 5-roughly selects tail coal, 6-filtrate, the dry thing of the thick cleaned coal of 7-, the selected cleaned coal of 8-, the selected tail coal of 9-, the overflow of 10-cyclone, 11-cyclone underflow, 12-high-frequency screen oversize, 13-high-frequency screen screenings, the overflow of 14-grinding of ball grinder, pan feeding pump-A, agitator-B, roughly select floatation equipment-C, screen-bowl centrifuge-D, Buffer Pool-E, selected floatation equipment-F, cleaned coal pond-G, cyclone feed pump-H, cyclone-I, high-frequency screen-J, ball mill-K, middle coal Buffer Pool-L, middle coal delivery pump-M, tail coal pond-N.
The specific embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is further described:
As shown in Figure 1, to enter float coal mud and floating agent is pumped in the agitator by pan feeding, after stirring by the impeller in the agitator, make the ore pulp that mass percent concentration is 80 g/L～120g/L, allow the ore pulp for preparing feed through the passage gravity flow and roughly select in the floatation equipment, roughly select floatation equipment and adopt the two-part flotation basin.After the two-part flotation basin is roughly selected, allow and isolatedly roughly select cleaned coal gravity flow and enter and carry out the cleaned coal dewatering operation in the screen-bowl centrifuge, obtain filtrate and the dry thing of thick cleaned coal, filtrate enters selected floatation equipment and carries out selected operation, and selected floatation equipment adopts flotation column or flotation device.The dry thing of thick cleaned coal and the cleaned coal chosen through flotation column or flotation device are as final cleaned coal; The tail coal of roughly selecting after the two-part flotation basin is roughly selected enters and concentrates classification in the cyclone, the underflow of cyclone enters high-frequency screen and dewaters, the oversize of high-frequency screen enters ball mill and carries out grinding operation, the pulp density of ball mill ore grinding is 35%～40%, the isolated selected tail coal of product behind the ball mill ball milling and selected floatation equipment enters in the lump sends agitator back to, carries out again sorting after sizing mixing, stirring; The overflow of cyclone and the screenings of high-frequency screen enter the tail coal pond in the lump as final tail coal.
Shown in Figure 2, comprise employing pan feeding pump A, agitator B, roughly select floatation equipment C, screen-bowl centrifuge D, Buffer Pool E, selected floatation equipment F, cleaned coal pond G, cyclone feed pump H, cyclone I, high-frequency screen J, ball mill K, middle coal Buffer Pool L, middle coal delivery pump M, tail coal pond N.To enter float coal mud 1 and floating agent 2 is sent among the agitator B by pan feeding pump A, after stirring by the impeller among the agitator B, make the ore pulp that mass percent concentration is 80 g/L～120g/L, allowing the floatation feed 3 for preparing feed through pipeline self roughly selects in the floatation equipment C, roughly select floatation equipment C and adopt the two-part flotation basin, the two-part flotation basin is made of the two-stage flotation post that is cascaded, and feeds two sections through the mine tailing of one section flotation again and continues sortings.After the two-part flotation basin is roughly selected, the isolated cleaned coal 4 of roughly selecting carries out the cleaned coal dewatering operation from flowing among the screen-bowl centrifuge D, obtain filtrate 6 and the dry thing 7 of thick cleaned coal, filtrate 6 enters selected floatation equipment F and carries out selected operation, selected floatation equipment F adopts flotation column or flotation device, is flotation column shown in the accompanying drawing 2.The selected cleaned coal 8 that the dry thing 7 of thick cleaned coal and selected floatation equipment F sub-elect enters cleaned coal pond G as final cleaned coal; Roughly selecting tail coal 5 is raised to deliver to by cyclone I feed pump H through Buffer Pool E and concentrates classification in the cyclone, cyclone underflow 11 enters high-frequency screen J and dewaters, the oversize 12 of high-frequency screen J enters ball mill K and carries out grinding operation, the pulp density of ball mill K ore grinding is 35%～40%, the isolated selected tail coal 9 of the overflow 14 of ball mill K and selected floatation equipment enters chats Buffer Pool L in the lump, raised by middle coal delivery pump M and to deliver in the agitator B, again sorting after sizing mixing, the screenings 13 of cyclone overflow 10 and high-frequency screen enters tail coal pond N as final tail coal.
Claims (3)
1. the sorting process of a high grey difficult separation coal mud comprises that the float coal mud that enters that will be furnished with floating agent feeds in the agitator, after the impeller strong stirring is even, makes the ore pulp that mass percent concentration is 80 g/L～120g/L; The pulp gravity flow for preparing enters to be roughly selected floatation equipment and carries out sorting, obtains the thick cleaned coal of flotation and roughly selects tail coal; Roughly selecting tail coal enters cyclone to carry out classification concentrated, carry out the concentrated underflow product of classification through cyclone and enter the high-frequency screen dehydration, the oversize of high-frequency screen dehydration enters to return after the ball mill fine grinding roughly selects the again sorting of operation of sizing mixing, the underflow of cyclone and the screenings of high-frequency screen are final tail coal, it is characterized in that: the thick cleaned coal of described flotation is fed in the screen-bowl centrifuge dewater, after the screen-bowl centrifuge dehydration, obtain head coal product and cleaned coal filtrate, cleaned coal filtrate is fed selected floatation equipment carries out selected, obtain head coal product and selected tail coal, selected tail coal and ball mill overflow are returned by the road in the lump and are roughly selected the operation of sizing mixing, and carry out again sorting.
2. the sorting process of the grey difficult separation coal mud of height according to claim 1 is characterized in that: the described floatation equipment employing two-part flotation basin of roughly selecting.
3. the sorting process of the grey difficult separation coal mud of height according to claim 1 is characterized in that: described selected floatation equipment employing flotation column or flotation device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110317595 CN102430481B (en) | 2011-10-19 | 2011-10-19 | Sorting process for high-ash and difficult-separation coal slime |
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| CN 201110317595 CN102430481B (en) | 2011-10-19 | 2011-10-19 | Sorting process for high-ash and difficult-separation coal slime |
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| CN102430481A CN102430481A (en) | 2012-05-02 |
| CN102430481B true CN102430481B (en) | 2013-03-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107520059A (en) * | 2017-08-22 | 2017-12-29 | 新沂市中诺新材料科技有限公司 | A kind of high grey difficult separation coal mud method for efficiently separating |
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| CN102716814B (en) * | 2012-06-26 | 2014-08-20 | 中国矿业大学 | Novel flotation column serial connection test system for improving flotation granularity upper limit |
| CN102716808A (en) * | 2012-07-09 | 2012-10-10 | 中国矿业大学 | Flotation process for difficultly selected coal slime with high middle density substance content |
| CN103028486B (en) * | 2012-12-21 | 2015-03-04 | 中国矿业大学 | High and medium density coarse slime separation process |
| CN103056020A (en) * | 2013-01-11 | 2013-04-24 | 武汉理工大学 | Maximum optional size grading process for beneficiation and grinding |
| CN103240168B (en) * | 2013-05-08 | 2014-12-10 | 中国矿业大学 | Classifying, separating and dewatering method for high-ash-content difficultly-separated coal slime |
| CN103752414A (en) * | 2014-01-07 | 2014-04-30 | 中国矿业大学(北京) | Pulp mixing reinforced deep flotation technology process |
| CN104399595A (en) * | 2014-11-03 | 2015-03-11 | 太原理工大学 | High-ash difficult-to-float coal slime flotation technology |
| CN104815748B (en) * | 2015-04-26 | 2017-06-20 | 中国矿业大学 | The broken mill floatation process of two sections of coal in a kind of coking |
| CN105170310B (en) * | 2015-10-15 | 2017-05-24 | 黑龙江科技大学 | Method for flotation of crystalline flake graphite through large crystalline flake graphite separation system |
| CN105750099B (en) * | 2016-02-29 | 2018-04-13 | 中国矿业大学 | A kind of method of high shear oil aggregation sorting fine coal slime |
| CN105728180B (en) * | 2016-03-22 | 2018-01-09 | 中国矿业大学 | A kind of processing recovery process of low grey coking floating tail-coal |
| CN110560254B (en) * | 2019-09-30 | 2021-02-26 | 西安科技大学 | Separation process for reducing sulfur and ash in coal |
| CN113182079B (en) * | 2021-04-28 | 2022-11-29 | 郑州大学 | Method for producing mineralized metallurgical medicament by using low-rank coal for quality improvement, mineralized metallurgical medicament and application |
| CN114713363B (en) * | 2021-10-19 | 2023-03-24 | 中国矿业大学 | Separation and recovery system and process for non-slime-formation fine-particle coal |
| CN114405664B (en) * | 2021-12-28 | 2024-03-19 | 中国矿业大学 | Non-quantization process for slime of classified and selected viscous-wet dynamic coal |
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| CN107520059A (en) * | 2017-08-22 | 2017-12-29 | 新沂市中诺新材料科技有限公司 | A kind of high grey difficult separation coal mud method for efficiently separating |
| CN107520059B (en) * | 2017-08-22 | 2019-08-16 | 山西途悦选煤工程技术有限公司 | A kind of high ash difficult separation coal mud method for efficiently separating |
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