CN1220908A - Dewatering method-ultrafiltration dewatering - Google Patents
Dewatering method-ultrafiltration dewatering Download PDFInfo
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- CN1220908A CN1220908A CN 98121654 CN98121654A CN1220908A CN 1220908 A CN1220908 A CN 1220908A CN 98121654 CN98121654 CN 98121654 CN 98121654 A CN98121654 A CN 98121654A CN 1220908 A CN1220908 A CN 1220908A
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Abstract
An ultrafiltration method for dewatering solid suspension features that the suspension to be dewatered flows through the filter medium carrrier to continuously spread a very thin layer of slurry on it by flow film method or flow slurry method and the continuous layer of slurry is dewatered by vacuum filter method. Said method is suitable for high-viscosity material or non-viscose material. Its advantages include high dewatering efficiency, continuous operation, simple structure, low energy consumption, less loss and high output.
Description
The present invention is applied to the dewatering equipment that industrial solid-liquid suspension such as mining industry, metallurgy, chemical industry, coal, environmental protection separates.
Tradition and still widely used at present solid-liquid suspension separation equipment type are a lot, for example:
1. centrifugation class: 3-foot sedimentation centrifuge, spiral discharge sedimentation centrifuge, cell-type seperator, disk centrifuge etc. are arranged.This kind equipment all will use the rotary drum that runs up of different structure etc. to provide centrifugal force to realize that (general rotating speed is 1600～6000rpm) to Separation of Solid and Liquid, and can not reclaim the ultramicron of-2 μ m usually, power consumption is big, and equipment precision requirement is very high, the production cost height;
2. screening and dewatering class: promptly refer to be used for all kinds of dewatering screens of dewatering operation, it only is applicable to dehydration, the desliming operation of thick material, right-0.075mm and-particulate of 0.045mm then is difficult to dehydration;
3. filtration class: be to hold back, and then class methods of solid particle are held back in accumulation by filter medium (as filter cloth).The motive force of filtering has normal pressure or negative pressure (vacuum filtration), has the surface filtration class to carry out cake filtration and in-depth filtration (solid particle is deposited on filter medium inside) two classes in the operation.
This kind equipment is in that to filter starting stage efficient still high, but (general thickness reaches 30～50mm) resistances and viscosity increases, and efficient obviously descends, and ceases operation normally, and output and labour intensity are big along with the thickening of filter cake;
4. press filtration class: be to go up a class pressure filtration equipment of realizing operation under the condition of pressurization at filter medium (sheet frame, filter cloth) to filtering suspended material.Compare with filtering class, big separating area and very high motive force can be provided, thereby be widely used, can handle solid concentration 1～10% or slightly high suspension (weight %).Filter cake thickness 30～60mm, still, this type of dehydration equipment still has and much is difficult to the disadvantage that overcomes, for example:
1. because of filter cake is thicker, need very big motive force (to filter operating pressure 1.0～4.0Mpa) (fluid pressure type, van-type, crowded press for extracting juice formula etc.);
2. cease operation between, manual cleaning's labour intensity is big, output is not high;
3. sealing requirements strictness, the equipment precision requirement height;
4. viscous material, filter efficiency are obviously descended, the ultra-fine high-viscosity material of particularly right-2 μ m (clay mineral or colloidality material) still is difficult to realize normal operation.
At present, the solid suspension dehydration equipment all is to do some improvement in the scope of said method both at home and abroad, for example: utility model patent " novel horizontal filter press " (application number 902179241.1), proposed a kind of malleation continuous filter press of belt scraping plate discharge gate, malleation work makes operating pressure obviously improve (bringing up to 2.5Mpa by 0.4～0.6Mpa) thereby the head coal product water content drops to below 18% by 30%.But this equipment will increase the pressure vessel of a cover with whole filter sealing, and positive pressure operation will be realized by the bigger coal slurry pump of power; Utility model patent " the malleation continuous filter of belt scraping plate discharge gate " (application number 92212807.3) provides a kind of novel horizontal filter, it is that above-mentioned filter is being done improvement from frame for movement, after improving, the frame for movement that transmission is compressed mode (machine driving compresses with hydraulic drive and compresses) reduced transmission (promotion) energy consumption, improved sealing, thereby transmission power is descended greatly, but this method still can not overcome the shortcoming of the aforementioned essence of filter, and its work gross pressure still reaches 130 tons.
Ultra-fine for some, clay mineral (bentonite for example particularly, sepiolite clay, kaolin or the like) dehydration, its difficulty is bigger, this mainly is because this class solid suspension material granularity is superfine, (reaching the colloid granularity) be its concentrate-2 μ m＞80% or higher usually, water absorption rate is very high, viscosity is big, therefore, can only add flocculant in the industrial production, refilter or filter-press dehydration after making fine monomer particle coacervation, for example use polyacrylamide or PAA etc., but coacervation can only be played and improve concentration and the effect that concentrates, the moisture content of coacervation material still very high (its solid weight concentration of high viscosity mineral is reached about 10～30%).And it all is organic high molecular polymer because of flocculant of adding, and the viscosity of coacervation thing is higher, and for a lot of dehydrating prods, Chang Yin contains organic matter and has toxicity simultaneously, thereby has placed restrictions on the scope of application of this class dehydrating prods.
Patent of invention " clay mineral wet-milling and the preparation of lift-off level soil " (application number CN90109603) is at high-viscosity material (clay) dehydration problem of difficult, adopted concentrate without filtering (or press filtration) convection drying dehydration method, this invention is not damaged in order to guarantee the colloidality that dehydrates product, changed conventional drying temperature (＞200～300 ℃) and the technology of employing low temperature drying (60～120 ℃), because of the low temperature drying dewatering efficiency low, the method of several different methods integrations of operation such as heat radiation drying (far infrared) electromagnetic field of high frequency drying and heat reflection drying has been adopted in this invention again, though this method can obtain the dehydration concentrate of high-quality, but equipment complexity, investment and cost height, output is on the low side, is difficult to industrializing implementation.
The present invention has changed the thinking of above-mentioned various dewaterings fully, a kind of brand-new all kinds of solid suspensions (new method of solid particle scope-0.5～0mm) dehydration that is suitable for has been proposed, that is: ultrafiltration dehydration, its essence is: adopt stream film or slurry flowing process, (0.1～2.0mm) state is laid on the filter medium (carrier) that moves continuously continuously uniformly, uses vacuum draw to realize the negative pressure dehydration with a super book layer to make solid suspension.Because in whole dehydration, suspension material remains a super book layer state, its filtration resistance is very little, and filter efficiency will be very high, and can realize continuously, dewater uniformly.According to concentration, viscosity and the fineness of solid material in the suspension, dense slurry amount and the thickness of feed layer of giving that change to suspend, for example high viscosity colloid material adopts stream embrane method, thickness of feed layer δ=0.1～4.0mm, in low viscous material slurry flowing process, thickness of feed layer 1.0～4.0mm.Dehydration applicable to all kinds of suspension.And change filter medium (as felt or filter cloth) speed of service and vacuum, then again can regulated at will production capacity and product moisture content quality.
That this method has is applied widely, process equipment is simple in structure, power consumption is low, realize the continuous dehydration operation, production capacity is big, the product moisture content is very low.And can realize full-automatic operation.Particularly this method can thoroughly solve high viscosity clay mineral dehydration problem of difficult.
Below in conjunction with accompanying drawing the present invention is further done an explanation:
As shown in drawings, filter medium carrier (1) (filter cloth or the felt) operation that between slewing rollers (2) and breast roll (9), moves in circles, suspension material (solid weight concentration 1.0～50.0%, best 5～30%) feed for stock tank (3), through evenly being laid on filter medium (carrier) filter cloth or felt (1) of operation for stock tank bottom side outlet, form superthin layer slip (4), be subjected to simultaneously vacuum filtration case (5) suction draining immediately, the vacuum filtration box number is pressed suspension concentration and dewatering and filtering difficulty and is decided, normal condition is 2～6, if the vacuum filtration box number is above 3, the centre can add carrying roller (6), normally moves to keep filter medium carrier horizontal direction.Slip conforms to dehydration substantially and requires (solid weight concentration 74～90%) behind the several vacuum draw, promptly send into breast roll (9) and finished product and take off and get between the tube (7), take off the extruding force of getting between the tube (7) further dewater again (solid weight concentration 76～92%) through breast roll (9) and finished product.Simultaneously, because of being inverted running between (7) and (9), can be according to the matsurface material to the principle of shiny surface transfer, the dehydration product on the coarse relatively filter medium can be taken off from the smooth relatively finished product of trend and get upward transfer of tube, use scraper (8) to scrape again and get, go out the final dewatering product.Final dewatering product moisture content is 8～26% (solid weight %) (deciding on material viscosity and fineness).
The filter medium that is diverted behind the material returns slewing rollers (1) from the bottom, proceed the filtering means dehydration operation of suspension.Elder generation is through tensioning group roller (10) in return course, make filter medium carrier tension, skid preventing, afterwards again through washer (11), washer is to use when blocking when ultrafilter is stopped using or because of the medium hole, to guarantee filter medium air permeability and good is arranged.Filter medium after cleaning is because of moisture higher, need again after vacuum filtration case (5) dehydration that return course is set up, return slewing rollers (2) again, the power of the vacuum draw of entire job is provided by vavuum pump (12), and the operation of filter medium carrier is to be driven by the breast roll with the buncher interlock.Also can not lose solid material under the normal condition in the waste water that is removed, promptly the rate of recovery is near 100%.
Below be the embodiment of the invention:
Example 1: scraper coating level kaolin dehydration
Former slip concentration 3.8% (solid weight concentration) ,-2 μ m 92.3%, 26 meters/minute of the filter medium speeds of service, vacuum 32Kpa, dehydrating prods moisture content 21.5% (solid weight concentration 81.5%), 5.45 tons/Ban Tai of output (doing the ore deposit), the rate of recovery 98.7%.
Example 2: ceramic grade kaolin dehydration
Former slip concentration 5.6% (solid weight concentration) ,-75 μ m84.3%, 38 meters/minute of the filter medium speeds of service, vacuum 25.5Kpa, dehydrating prods moisture content 18.6%, 8.4 tons/Ban Tai of output (doing the ore deposit), the rate of recovery 99.8%.
Example 3: coating level bentonite dehydration
Former slip concentration 4.2% (solid weight concentration) ,-2 μ m98.2%, 31 meters/minute of the filter medium speeds of service, vacuum 35.2Kpa, dehydration output moisture content 22.6%, 4.52 tons/Ban Tai of output (the doing the ore deposit) rate of recovery 98.6%.
Example 4: floatation clean coal dehydration
Former slip concentration 8.3% (solid weight concentration) ,-75 μ m82.6%, 38 meters/minute of the filter medium speeds of service, vacuum 26Kpa, dehydrating prods moisture content 12.8%, 10.6 tons/Ban Tai of output (the doing the ore deposit) rate of recovery 99.5%.
The dehydration of example 5:4A synthetic zeolite
Former slip concentration 6.8% (solid weight concentration) ,-2 μ m93.6%, 34 meters/minute of the filter medium speeds of service, vacuum 26.6Kpa, dehydrating prods moisture content 18.6%, 6.4 tons/Ban Tai of output (the doing the ore deposit) rate of recovery 99.2%.
Claims (7)
1. the new method of solid suspension dehydration is characterized in that:
1. it is applicable to the dehydration method of solid suspension in various natural minerals or artificial mineral or the chemical engineering industry;
2. its essential characteristic is: the dewatering that adopts brand-new type---ultrafiltration, promptly realize the continuous filtration dehydration method to the solid suspension of super book layer.
2. the dehydration of above-mentioned solid suspension, the granularity that is meant solid material wherein less than all kinds solid particle 0.5mm～0mm scope, that be meant especially-0.075～0mm, can in aqueous medium, suspend, comprising: all kinds of clay minerals; All kinds of fibrous minerals and metallic ore, nonmetallic ore and coal (coal slime and floatation clean coal) after broken, ore grinding or ore dressing, mud etc. also comprise the dewatering operation of the solid suspension in various artificial minerals or inorganic chemical industry, the organic chemical industry's production process.
3. the technical characterictic of above-mentioned ultrafiltration dehydration is: make suspension lay the method for the slip of one deck superthin layer uniformly on a carrier filter medium that moves continuously, it is characterized in that:
1. the carrier of Shi Yonging is meant the fabric natural or artificial or natural and artificial compounded with good water imbibition, gas permeability.As felt, filter cloth etc., and the annular of reciprocal operation capable of circulation (electrodeless) fabric; Width of fabric 0.5～3.0m, thickness 1～8mm.
The method of 2. laying a superthin layer slip on carrier is to adopt stream embrane method or slurry flowing process.Stream embrane method laying depth is 0.1～2.0mm, and best 0.8～1.5mm is applicable to the dehydration of high-viscosity material; The slurry flowing process laying depth is that (best 2.0～3.5mm) are applicable to the non-sticky material to 1.5～4.0mm.Two methods all adopt for stock tank and supply slurry, and the regulating gate size is finished;
3. flowing embrane method is 0.3～8% (solid weight concentration) for the slurry concentration range; Slurry flowing process is 2～50% (solid weight concentration) for slurry concentration.(optium concentration is decided on different suspension rerum naturas);
4. the technical characterictic of above-mentioned ultrafiltration is: suspension is once being laid on the carrier, then adopt the negative-pressure operation of vacuum filtration to implement dewatering operation immediately, vacuum filtration is to realize carrier upper strata thin layer suspension slip dewatering operation by the vacuum filtration case to the suction of aqueous carrier; The vacuum filtration box number is 1～6, best 2～4, and vacuum 10～40Kpa.
5. the technical characterictic of above-mentioned ultrafiltration is: the solid material after the vacuum draw dehydration, have taking off and get between the tube the more further feature of extrusion dehydration through breast roll place and finished product, it is 0.1～1.0Mpa that breast roll and finished product are taken off the linear pressure of getting between the tube, best 0.15～0.3Mpa.
6. the technical characterictic of above-mentioned ultrafiltration is: the finished product after dewatering after filtration, take off the pressure of getting between the tube through breast roll and finished product, the counter motion on two surfaces and finished product are taken off and are got tube surface and be higher than the fineness of carrier surface and realize that dehydrating prods takes off the transfer of getting tube to finished product, it is 2～ 6 that finished product is taken off the fineness of getting tube, best 3～ 4;
7. the technical characterictic of above-mentioned ultrafiltration is: the filter medium carrier after solid material is removed in transfer is back to slewing rollers through breast roll, continues to realize that the shop slurry of following one-period filters, thereby realizes the ultrafiltration dewatering operation of continuous operation.The travel line speed of carrier is 20～50 meters/minute, best 25～35 meters/minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98121654 CN1220908A (en) | 1998-11-03 | 1998-11-03 | Dewatering method-ultrafiltration dewatering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98121654 CN1220908A (en) | 1998-11-03 | 1998-11-03 | Dewatering method-ultrafiltration dewatering |
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| CN1220908A true CN1220908A (en) | 1999-06-30 |
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| CN 98121654 Pending CN1220908A (en) | 1998-11-03 | 1998-11-03 | Dewatering method-ultrafiltration dewatering |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954231A (en) * | 2010-04-20 | 2011-01-26 | 南通泰禾化工有限公司 | Solid-liquid separation process for preparing isophthalodinitrile |
| CN102614700A (en) * | 2012-02-28 | 2012-08-01 | 黄文龙 | Sewage diversion trench suction filter system |
| CN102849809A (en) * | 2012-10-12 | 2013-01-02 | 沈光喜 | Box type water treatment equipment |
| CN103830949A (en) * | 2014-03-31 | 2014-06-04 | 江苏兆盛环保集团有限公司 | Slag removing device of superfine grid trash cleaning device |
| CN105668983A (en) * | 2016-03-16 | 2016-06-15 | 柳州市杰特建材有限责任公司 | Slurry collecting method dewatering system and process |
| CN109292914A (en) * | 2018-11-01 | 2019-02-01 | 艾特克控股集团股份有限公司 | A kind of Treatment of Metal Surface waste water purification device |
-
1998
- 1998-11-03 CN CN 98121654 patent/CN1220908A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954231A (en) * | 2010-04-20 | 2011-01-26 | 南通泰禾化工有限公司 | Solid-liquid separation process for preparing isophthalodinitrile |
| CN101954231B (en) * | 2010-04-20 | 2012-07-18 | 南通泰禾化工有限公司 | Solid-liquid separation process for preparing isophthalodinitrile |
| CN102614700A (en) * | 2012-02-28 | 2012-08-01 | 黄文龙 | Sewage diversion trench suction filter system |
| CN102614700B (en) * | 2012-02-28 | 2015-04-29 | 黄文龙 | Sewage diversion trench suction filter system |
| CN102849809A (en) * | 2012-10-12 | 2013-01-02 | 沈光喜 | Box type water treatment equipment |
| CN103830949A (en) * | 2014-03-31 | 2014-06-04 | 江苏兆盛环保集团有限公司 | Slag removing device of superfine grid trash cleaning device |
| CN105668983A (en) * | 2016-03-16 | 2016-06-15 | 柳州市杰特建材有限责任公司 | Slurry collecting method dewatering system and process |
| CN105668983B (en) * | 2016-03-16 | 2019-03-12 | 柳州市杰特建材有限责任公司 | Collect slurry processes dewatering system and technique |
| CN109292914A (en) * | 2018-11-01 | 2019-02-01 | 艾特克控股集团股份有限公司 | A kind of Treatment of Metal Surface waste water purification device |
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