CN1500752A - Method and apparatus for reclaiming washed coal from slime water in coal washery - Google Patents
Method and apparatus for reclaiming washed coal from slime water in coal washery Download PDFInfo
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- CN1500752A CN1500752A CNA021359016A CN02135901A CN1500752A CN 1500752 A CN1500752 A CN 1500752A CN A021359016 A CNA021359016 A CN A021359016A CN 02135901 A CN02135901 A CN 02135901A CN 1500752 A CN1500752 A CN 1500752A
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Abstract
The present invention is the method and apparatus for recovering refined coal from coal-washing coal slurry water features that high-frequency vibration sieve is used as coal slurry water dewatering and refined coal classifying apparatus, in which coal slurry water is pre-dewatered in the arced sieve and then dewatered and classified in high-frequency vibration sieve to recover refined coal. The method of the present invention is superior to available floating method and has lower cost, raised coal quality and high yield.
Description
One, technical field
The application belongs to the coal washing manufacture field.
Two, present technology status
The coal washery adopts jig to carry out the qualified cleaned coal of washing more at present, because technical elements, the sieve seam of jig stationary screen and cleaned coal draining screen can only accomplish to be not less than 0.5mm, so jig can only wash out the cleaned coal greater than 0.5mm.Fall into less than the cleaned coal of 0.5mm so and drag for the hole, squeeze into rake thickener from dragging for the hole by pump again, and mix the formation black water mutually with the thin mud of high ash in the rake thickener.And then with the method for flotation, reclaim in the black water cleaned coal less than 0.5mm.
The method of flotation is, black water enters kaskad apparatus for pre-flotation pulp conditioning through the bottom of rake thickener by the pressurization of slag stock pump, add again after flotation reagent (being generally diesel oil) mixes, enter flotation machine again and carry out sorting, the cleaned coal that sub-elects enters clean coal pressur filter, after the pressure filter dehydration, produce the cleaned coal of flotation, enter cleaned coal haulage system.This method for floating has following deficiency: 1, the equipment of usefulness is more, and current consumption is big, and production technique is numerous and diverse; 2, adjustable parameters is more, and as feeding, go into floating concentration, add the clear water amount, add flotation reagent amount etc., human factor is more, and is not easy to operate; 3, product ash content height, quality of cleaned coal can not get guaranteeing; 4, need to add flotation reagent, increase production cost; 5, the coarse slime greater than 0.5mm can not get effective sorting, promptly causes " race coal ", pollutes mutually with black water, and then influences the rate of recovery and the quality of cleaned coal.
Three, application purpose
The application's purpose is the deficiency that overcomes floatation process, proposes producing and manufacturing technique and production unit that a kind of new black water reclaims cleaned coal.
Four, technical scheme
The application's technical scheme is based on following principle of work:
When certain density fine granular materials (black water) flows through the flexible screen of certain density mesh of high-frequency vibration of certain setting angle, present good classification performance, promptly have stronger sorting for fine particle less than flexible sieve aperture.Therefore in the application's the scheme, mainly designed a kind of high-frequency excitation sieve,, reached the purpose of the qualified cleaned coal of sorting by " amplitude knob " on the adjusting controlling box panel according to the aqueous concentration and the classification requirement of material on the compass screen surface.
The complete machine structure of high-frequency excitation sieve is:
A feed box is installed above the sieve-bend screen support, and the feed box end opening has the sluice gate of control flow velocity.At feed box end opening place, a sieve-bend screen is installed.Sieve-bend screen is made up of sieve nest and stainless steel sift sheet.Settle vibratory screening apparatus base (or support) in sieve-bend screen end opening one side, the high-frequency excitation sieve nest is installed on the base.The high-frequency excitation sieve nest has certain gradient, is generally 25～35 °, carries out the gradient adjustment according to practical condition.The structure of high-frequency excitation sieve nest is: below a screen box body discharge port is arranged, flexible screen is arranged in the casing, flexible screen is formed by the Stainless Steel Wire braiding, and it is 0.1～0.5mm that mesh requires according to classification.One end hook of flexible screen is on the hook-type plate of screen box body discharge port, and the other end is with the tensioning of drag hook plate.In the both sides of screen box body some electromagnetic vibrators are installed, two relative vibrators of both sides partner, every pair of union lever by vibrator is connected on the exciting arm below the flexible screen, distributes on the exciting arm plurality of elastic pounder is installed, and the elasticity pounder is close on the flexible web bottom surface; When the adhesive of electro-magnet energising high frequency, make flexible web do high frequency vertical vibration (casing does not vibrate).The multichannel electromagnetic vibrator is controlled by computerized control system.Controlling System adopts micro-chip and multichannel silicon controlled rectifier supporting circuitry to form.By this system can segmentation control multichannel electromagnetic vibrator amplitude and shake frequently, make the different frequency of upper and lower each section generation of flexible screen and the vibration of amplitude.General control amplitude 1～5mm shakes 1000～6000 hertz frequently.The size that the silicon controlled rectifier electric current is regulated by potentiometer in every road, thus the control current of electromagnet is adjusted the amplitude that high-frequency excitation sieves every section.
After adopting above-mentioned high-frequency excitation sieve, its production technique is:
1. in rake thickener, mix the black water that forms, directly squeeze into the feed box that the electromagnetic high-frequency exciting sieves, behind the certain flow of feed box control of export, enter sieve-bend screen and give the coal slime slurry that dehydration forms high density from the thickner bottom with the slag stock pump;
2. the coal slime slurry after the pre-dehydration flows into from the sieve-bend screen end opening has electromagnetic high-frequency exciting sieve constant slope and certain mesh, in the flow process, through the different frequency of each section of screen cloth, the high-frequency vibration of amplitude, the coal slime slurry carries out classification and dehydration again, flow to the cleaned coal of screen overflow for reclaiming at discharge port place, cleaned coal continuously flows into cleaned coal haulage system; Undersized dirty coal muddy water falls into another rake thickener, produces dirty coal mud through the tail coal pressure filter again after concentrating.
Five, technique effect
The positively effect of this technology is: 1, because the coal slime slurry of black water after the pre-dehydration of sieve-bend screen directly enters the adjustable electromagnetic high-frequency exciting sieve of compass screen surface amplitude segmentation, thereby can adjust the dispersity that the compass screen surface coal slime is starched according to the concentration and the state piecewise of the mobile dehydration on screen cloth of coal slime slurry, promptly guaranteed the upward high yield of cleaned coal of sieve, guaranteed the requirement of cleaned coal water ratio again, the two is taken into account, thereby solved dehydration and fractionated contradiction; Also help more coarse grained cleaned coal and break away from, satisfied the big and high requirement of quality of quantity of cleaned coal simultaneously attached to the grey thin mud of the height on its surface.2, behind this novel electromagnetic high-frequency exciting sieve of employing, reduced the equipment of original floatation process, as main equipments such as kaskad apparatus for pre-flotation pulp conditioning, flotation machine, pressure filter, also no longer add flotation agent and carry out technologies such as flotation and press filtration, black water is directly produced cleaned coal through the high-frequency excitation sieve.Behind the reduction of process, not only reduced power consumption, but also increased the treatment capacity of black water, reduced circulating water in coal washing concentration, improved coal washing water running quality, realized coal washing water closed cycle use, black water no longer effluxes, has saved water resources.
Six, description of drawings
Fig. 1 is the side-view synoptic diagram of electromagnetic high-frequency exciting sieve
Fig. 2 is the front view synoptic diagram of electromagnetic high-frequency exciting sieve
Fig. 3 is the A-A sectional drawing
Fig. 4 is the controlling box schematic circuit of electromagnetic vibrator
1-feed box, 2-sieve-bend screen support, 3-sieve-bend screen, 4-flexible screen, 5-electromagnetic vibrator among the figure
Water funnel 20-vibratory screening apparatus discharge port under water tube hose 7-angle adjustment lever 8-set screw nut 9, the rotating shaft of 10-vibratory screening apparatus and axle bed 11-main support 12-rubber pad 13, the rotating shaft of 14-sieve-bend screen and axle bed 15-main screen box body 16,17-union lever and the shaker arm 18-rubber hammer 19-vibratory screening apparatus under water funnel reaches under 6-sieve-bend screen
Seven, embodiment
The application's embodiment is described according to Fig. 1, Fig. 2.
At first illustrate that according to Fig. 1, Fig. 2 electromagnetic high-frequency swashs the structure of sieve.Install feed box (1) in the top of sieve-bend screen support (2), feed box (1) end opening has the sluice gate of controlling flow velocity; The end opening place of going up feed box (1) at sieve-bend screen support (2) is sieve-bend screen (3), and rotating shaft (13) is arranged on the sieve-bend screen (3), is installed on the sieve-bend screen support (2) by the axle bed (14) on the support (2); Sieve-bend screen (3) bottom is equipped with down water funnel and following water tube hose (6), and the undersized black water of sieve-bend screen flows into water funnel (7) under the vibratory screening apparatus through (6).Side at sieve-bend screen (2) end opening is settled main support (11), and main support (11) is placed in above the rubber pad (12), prevents mount vibration.There is angle adjustment lever (7) top, both sides of main support (11), down either side has axle bed (10), main screen box body (15) below is installed on the axle bed (10) by rotating shaft (9), the top flexibly connects with angle adjustment lever (7), thereby main screen box body (15) and main support (11) are installed together, and adjust the arrangement gradient of main screen box body (2) by rising and falling of angle adjustment lever (7); After test is settled the gradient to be advisable with 30 °, adjusted the suitable gradient, fixing with set screw nut (8).There is flexible screen (4) the inside of main screen box body (15), flexible screen (4) is formed by the Stainless Steel Wire braiding, the size of mesh requires to be advisable with 0.1～0.15mm according to the classification of cleaned coal, also can be attached to the bigger holder net of a mesh below the screen cloth (4), thereby can hold in the palm attached heavier screen overflow body; One end hook of screen cloth (4) is on the hook-type plate of vibrating screen box discharge port (20), and the other end is strained with the drag hook plate.Both sides at main screen box body (15), each installs seven electromagnetic vibrators (5), form seven pairs of electromagnetic vibrators, the armature of every pair of vibrator (5) connects shaker arm (17) below the screen cloth by a union lever (16), is with four-six rubber hammers (18) on the shaker arm (17), rubber hammer (18) is close on flexible web (4) bottom surface; When electromagnetic vibrator (5) energising vibration, make picture glue hammer (18) high frequency hit flexible web (4), flexible screen (4) is made high-frequency vibration.In the course of the work, the best amplitude of flexible web (4) is about 3mm, and it is 1500～2000Hz that the best is shaken frequently.The whole compass screen surface of flexible screen (4) can be divided into seven kinds of different amplitudes according to practical condition, thereby reaches different processing requirements, and the amplitude of each section is regulated " amplitude modulation " knob controlling by controlling box.
Fig. 4 has provided the governor circuit figure of controlling box, and it is made up of the micro-chip and the supporting circuitry of two PIC16F74 models.Two micro-chips are controlled 14 electromagnetic vibrators of main box (2) both sides respectively, and 14 electromagnetic vibrator electric currents are supplied with by 14 silicon controlled rectifiers in the circuit respectively.By " amplitude modulation " knob on the controlling box panel is the electric current that the 2.2K potentiometer knob on every road is regulated every pair of electromagnetic vibrator of control, thus the size of regulating the amplitude of every section screen cloth.
After adopting above-mentioned high-frequency excitation sieve, its production technique is:
1. in rake thickener, mix the black water that forms, directly squeeze into the feed box (1) of electromagnetic high-frequency exciting sieve with the slag stock pump from the thickner bottom, behind the certain flow of feed box sluice gate control, enter sieve-bend screen (3) and dewatering in advance in the process of flowing voluntarily, form the coal slime slurry of high density;
2. the coal slime slurry after the pre-dehydration flows into from sieve-bend screen (3) end opening has electromagnetic high-frequency exciting sieve 30 ° of gradients and 0.1～0.15mm mesh, in the flow process, through 1500～2000Hz frequency of each section of screen cloth, the high-frequency vibration of 3mm amplitude, the coal slime slurry carries out classification and dehydration again, flow to the cleaned coal of screen overflow for reclaiming that vibratory screening apparatus discharge port (20) is located, cleaned coal continuously flows into cleaned coal haulage system; Undersized dirty coal muddy water falls into another rake thickener, produces dirty coal mud through the tail coal pressure filter again after concentrating.
Claims (2)
1. the processing method of reclaiming washed coal from slime water in coal washery is characterized in that:
(1) black water that mix to form in rake thickener is directly squeezed into the feed box of high-frequency excitation sieve with the slag stock pump from the thickner bottom, enter sieve-bend screen behind the certain flow of feed box control of export and dewater formation high-concentration coal mud in advance;
(2) the coal slime slurry flows into from the sieve-bend screen end opening and has high-frequency excitation sieve constant slope and certain mesh, in the flow process under high-frequency vibration, the coal slime slurry carries out classification and dehydration again, flow to the cleaned coal of screen overflow for reclaiming at discharge port place, constantly flows into cleaned coal haulage system; Screen underflow falls into another rake thickener, concentrates after the tail coal pressure filter is produced dirty coal mud.
2. the high-frequency excitation of reclaiming washed coal from slime water in coal washery sieves, and it is characterized in that:
(1) feed box and the sieve-bend screen of being made up of sieve nest and stainless steel sift sheet with control flow velocity sluice gate is installed above the sieve-bend screen support;
(2) settle a base or support in a side of sieve-bend screen end opening, the high-frequency excitation sieve nest with constant slope is installed on the base; The structure of high-frequency excitation sieve nest is: below a screen box body discharge port is arranged, there is flexible screen casing the inside, and flexible screen is formed by the Stainless Steel Wire braiding, and an end hook is on the hook-type plate of discharge port, and the other end is with the tensioning of drag hook plate;
(3) some electromagnetic vibrators to 1000～6000Hz are installed in screen box body both sides, every pair of electromagnetic vibrator connects the exciting arm by union lever, the elasticity pounder is housed on the shaker arm and is close on the flexible screen bottom surface;
(4) electromagnetic exciter is controlled by Controlling System, and Controlling System is made up of micro-chip and multichannel circuit of SCR, and by regulating every road potentiometer, the control silicon controlled rectifier outputs to every road current of electromagnet, makes every section of the high-frequency excitation sieve to produce different amplitudes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135901 CN1225418C (en) | 2002-11-13 | 2002-11-13 | Method and apparatus for reclaiming washed coal from slime water in coal washery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135901 CN1225418C (en) | 2002-11-13 | 2002-11-13 | Method and apparatus for reclaiming washed coal from slime water in coal washery |
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| Publication Number | Publication Date |
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| CN1500752A true CN1500752A (en) | 2004-06-02 |
| CN1225418C CN1225418C (en) | 2005-11-02 |
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| CN 02135901 Expired - Fee Related CN1225418C (en) | 2002-11-13 | 2002-11-13 | Method and apparatus for reclaiming washed coal from slime water in coal washery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103785605A (en) * | 2014-03-12 | 2014-05-14 | 于国泉 | High-frequency electromagnetism sieve for ceramic industry and using method thereof |
| WO2015103316A1 (en) * | 2013-12-31 | 2015-07-09 | Omnis Mineral Technologies, Llc | Vibration assisted vacuum dewatering of fine coal particles |
| CN106362857B (en) * | 2016-08-27 | 2019-03-19 | 张延杰 | A kind of technique of artificial coal slurry flotation upgrading desulfurization |
| CN110790469A (en) * | 2019-11-08 | 2020-02-14 | 中国矿业大学 | Process and device for improving pressure filtration performance of tail coal slime by coal gasification fine slag |
| WO2020164241A1 (en) * | 2019-02-12 | 2020-08-20 | 中国矿业大学 | Gravity separation apparatus and method for coarse coal slime |
-
2002
- 2002-11-13 CN CN 02135901 patent/CN1225418C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015103316A1 (en) * | 2013-12-31 | 2015-07-09 | Omnis Mineral Technologies, Llc | Vibration assisted vacuum dewatering of fine coal particles |
| CN106029199A (en) * | 2013-12-31 | 2016-10-12 | 地球科技美国有限责任公司 | Vibration assisted vacuum dewatering of fine coal particles |
| US9587192B2 (en) | 2013-12-31 | 2017-03-07 | Earth Technologies Usa Limited | Vibration assisted vacuum dewatering of fine coal particles |
| CN106029199B (en) * | 2013-12-31 | 2018-01-16 | 地球科技美国有限责任公司 | The vibration auxiliary vacuum dehydration of duff particle |
| CN103785605A (en) * | 2014-03-12 | 2014-05-14 | 于国泉 | High-frequency electromagnetism sieve for ceramic industry and using method thereof |
| CN106362857B (en) * | 2016-08-27 | 2019-03-19 | 张延杰 | A kind of technique of artificial coal slurry flotation upgrading desulfurization |
| WO2020164241A1 (en) * | 2019-02-12 | 2020-08-20 | 中国矿业大学 | Gravity separation apparatus and method for coarse coal slime |
| CN110790469A (en) * | 2019-11-08 | 2020-02-14 | 中国矿业大学 | Process and device for improving pressure filtration performance of tail coal slime by coal gasification fine slag |
| CN110790469B (en) * | 2019-11-08 | 2021-03-02 | 中国矿业大学 | Process and device for improving pressure filtration performance of tail coal slime by coal gasification fine slag |
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| Publication number | Publication date |
|---|---|
| CN1225418C (en) | 2005-11-02 |
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