CN103587002B - The fragmentation of waste or used plastics and high-pressure electrostatic separation method - Google Patents
The fragmentation of waste or used plastics and high-pressure electrostatic separation method Download PDFInfo
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- CN103587002B CN103587002B CN201310561060.6A CN201310561060A CN103587002B CN 103587002 B CN103587002 B CN 103587002B CN 201310561060 A CN201310561060 A CN 201310561060A CN 103587002 B CN103587002 B CN 103587002B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The invention provides a kind of fragmentation and high-pressure electrostatic separation method of waste or used plastics, the method adopt four toothed roll crushers-high speed pulverizing-vortex air flow charged-high-pressure electrostatic separation method, comprising: Mechanical Crushing is carried out to waste or used plastics, the particle of fragmentation is pulverized further, hybrid particles is friction charged and carry out high-pressure electrostatic and be separated four operations.In the present invention, four toothed roll crushers, high speed impact pulverizer, the charged cylinder of vortex air flow and high-pressure electrostatic separation equipment composition closed system, adopt conveyer belt to carry out the transmission of material between system, whole system is carried out under air-proof condition, three-waste free discharge, reduces environmental pollution.The present invention is without the need to waste or used plastics identification operation, and treating capacity is high, is easy to commercial Application, has that cost is low, efficient, structure is simple, free of contamination feature.
Description
Technical field
The present invention relates to the trade waste process in environmental protection technical field, resource field, particularly, relate to a kind of fragmentation and high-pressure electrostatic separation method of waste or used plastics, is reclaim waste or used plastics, regenerate and a kind of method of resource.
Background technology
Since nearly half a century, plastics are widely applied because of characteristics such as it are cheap, safe, durable and light in every profession and trade, and the plastics consumption in the world also constantly raises fast.It is reported, in past 20 years, the average plastics annual production increasing degree in the whole world was more than 5%, and the plastics output in the whole world in 2010 is close to 200,000,000 7,000 ten thousand tons, and the demand of plastics is still constantly soaring.Although plastic products have higher durability degree, a large amount of plastics are still had to be discarded every year.Data show, and in Gary solid waste, the ratio shared by waste or used plastics has risen to 12.4% in 2010 from 9.5% in 1994.
The molecular structure of waste or used plastics goods is firm, and under natural conditions, decomposition rate is very slow.As polyethylene (polyethylene, PE) polyvinyl chloride (polyvinylchloride, PVC) in soil, about 300-400 could be degradable, prolonged stay destroys the gas permeability of soil in soil, reduce the water-holding capacity of soil, have impact on the moisture of crops, the absorption of nutrient, hinder the growth of seedlings of cereal crops root system, the significantly underproduction of crops can be caused, make arable land deterioration.In addition the heavy metal ion in plastic additive and noxious material can spread, permeate in soil, directly affect groundwater quality and plant growth.Plastic refuse is 4 times of oil spill and leakage harmfulness to the harm that marine organisms are caused, be often only be discarded in ocean discarded fishing gear just more than 150,000 tons, various plastic waste material is more than millions of tons.According to statistics, in annual Global Oil output, about have 4% can be used to produce plastic raw materials, separately have 4% can be used as producing the fuel of plastic by-product.Petroleum resources are limited, and China is an oil consumption big country.Net importation amount to China's oil in 2011 is 2.51 hundred million tons, becomes the large net import of oil state of the first in the world.Demand is surged and is caused oil price to rise suddenly and sharply, and brings very large disparities between supply and demand and impact to plastics industry.
The recycling processing method of current waste or used plastics mainly contains chemical method and Physical.Mechanical approach easily realizes through engineering approaches, can't produce secondary pollution, and this method enjoys great popularity.
Through retrieval, Chinese invention patent " a kind of waste or used plastics recycling processing method and equipment " (bright fruit English etc., the patent No. 201210228475.7), a kind of waste or used plastics recycling processing method and equipment are provided, equipment comprises cracking and sorting treatment system and cleaning separation process system, cracking and sorting treatment system comprises two-stage feedstock transportation band, two stage crusher, magnetic separator, two-stage broken material conveyer belt, cleaning separation process system comprises Rinsing Area, jetsam conveyer belt, saline slot, spiral discharging machine, and auger conveyor, buoyant elevator, the inventive method is separated two-step process by cracking and sorting with cleaning and forms.Cracking and sorting technique is made up of manual sorting, one-level fragmentation, magnetic separation, two-stage crushing step successively, cleaning separating technology adopt the liquid of clear water and salt solution two kinds of different densities just each component separation of waste or used plastics come.The present invention have good separating effect, resource recovery high, do not produce the features such as secondary pollution.The fragmentation of waste or used plastics manual pick, two-stage, magnetic separation, clear water flotation, the separation process of brine floatage, although the present invention can realize the separation of mixed plastic, whole assorting room is loaded down with trivial details; In method, the material of all fragmentations is adopted tank, saline slot carries out difference in specific gravity sorting, and having overlap or characteristic density between the density range due to many plastics, very close (characteristic density as PVC and PET is respectively 1.39gcm
-3and 1.37gcm
-3), therefore rely on merely the density variation efficiency of separation low, product needed dehydration, drying, and there is the environmental pollution improvement such as mud and wastewater treatment problem.
Chinese invention patent " high-voltage electrostatic separation method of recycled plastics in waste electronic apparatus " (Fan Hongjie etc., patent No. 201110120653.X), the present invention relates to the isolation and purification method of plastics in a kind of waste and old electric electrical equipment, with in the friction cyclone of PET material stir realize phase mutual friction, plastics are made to pass through frictional electrification, different according to plastic friction chargeding performance, the plastics of frictional electrification are contacted with rotary electrode and high-voltage electrostatic field is provided, due to the compound action of centrifugal force and electrostatic force, throw away from rotary electrode the plastic grain fallen present different tracks due to current potential difference and produce certain distance, categorised collection is carried out with the container of the positive plate of band, thus realize sorting and the purifying of variety classes plastics, final recovery obtains with PS, PP, ABS, PVC etc. are that main single component thermoplastic grain products purity can reach 95%.This invention waste and old electric electrical equipment fragmentation, magnetic separation, eddy current electric separation, circulation fragmentation, suspension selection by winnowing, high-voltage electrostatic sorting obtain one-component plastics, and whole assorting room is loaded down with trivial details; The plastics of similar density cannot be separated by the selection by winnowing that suspends in method, and friction cyclone and electrostatic separator structure describe unclear.
Chinese invention patent " a kind of waste or used plastics identification and separator and method " (Hua Lin etc., the patent No. 201210220498.3), a kind of waste or used plastics identification and separator are provided, comprise breaker, rubbing device, accelerator, stationary magnetic field device, comparison means and gathering-device; The pure plastics of various standard or waste or used plastics are charged by rubbing device after breaker fragmentation, enter accelerator after charged to accelerate, then to enter stationary magnetic field with the identical speed that the angle of magnetic direction is greater than zero, form different movement locus, the movement locus of the movement locus of waste or used plastics particle and the pure plastic grain of various standard compares by comparison means, thus determines in waste or used plastics identical with the pure plastics kind of the standard with it with same motion trajectory.Gathering-device is collected in the close waste or used plastics particle of movement locus in magnetic field.The present invention also provides a kind of waste or used plastics identification and separation method.This patent need adopt the pure plastics of standard and band to select materials to carry out track contrast, thus determines in waste or used plastics identical with the pure plastics kind of the standard with it with same motion trajectory, carries out identifying and being separated; Gathering-device is collected in the close waste or used plastics particle of movement locus in magnetic field; Complex process, identify with separating difficulty high, treating capacity is low, is difficult to commercial Application.Four tooth-like roll crushing-high speed pulverizing-vortex air flows that the present invention adopts are charged-high-pressure electrostatic separation method, and simply, without the need to recognizer, treating capacity is high, is easy to commercial Application in technological process.And the feature such as pollution-free, reduce environmental pollution.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of fragmentation and high-pressure electrostatic separation method of waste or used plastics, mixed plastic is carried out effective broken and separation and concentration by the method, realizes the recovery to waste or used plastics, regeneration and recycling treatment.
For realizing above object, the invention provides a kind of fragmentation and high-pressure electrostatic separation method of waste or used plastics, adopt four toothed roll crushers-high speed pulverizing-vortex air flow charged-high-pressure electrostatic separation method, comprising: Mechanical Crushing is carried out to waste or used plastics, the particle of fragmentation is pulverized further, hybrid particles is friction charged and carry out high-pressure electrostatic and be separated four operations; Concrete:
Step one, first with conveyer belt, waste or used plastics product is transported to four toothed roll crushers, waste or used plastics is broken into the fragment that granularity is 5mm-10mm;
Step 2, adopt conveyer belt that the waste and old plastic fragment that granularity is 5mm-10mm is transported to high speed impact pulverizer again, further waste or used plastics is ground into the plastic grain of 0.8mm-2mm;
Step 3, then pulverized plastic grain is transported in the charged cylinder of vortex air flow by the vortex air flow produced by centrifugal pump, plastic grain, with the motion of high speed vortex air flow, collides between plastic grain, plastic grain and vortex air flow charged cylinder wall collides and charged in the charged cylinder of vortex air flow;
Step 4, charged plastic grain enter discharge chute by closing wind discharge valve, and the plastic grain through discharge chute vertically falls into electrostatic separation space; Electrostatic separation space is made up of the positive electrode plate of opposite polarity, negative electrode plate, under the effect of positive and negative electrode plate, the plastic grain of lotus opposite charges in mixed plastic is separated, namely positive electrode plate produces sucking action to the particle of bear electricity, negative electrode plate produces sucking action to the particle of lotus positive electricity, obtain the plastic grain of one-component, thus realize the separation of mixed plastic particles.
Preferably, in step one and step 2, according to the kind of waste or used plastics and broken granularity requirements can be needed, determine the technological parameter of four toothed roll crushers and high speed impact pulverizer.
Preferably, step 3 and step 4 by vortex air flow charged-high-pressure electrostatic separator realizes, this device comprises: hybrid particles charging aperture, the charged cylinder of vortex air flow, centrifugal pump, close wind discharge valve, discharge chute, positive electrode plate, negative electrode plate, wherein: centrifugal pump is arranged at the top of the charged cylinder of vortex air flow, hybrid particles charging aperture is arranged at the top of the charged cylinder side of vortex air flow, the bottom of the charged cylinder of vortex air flow connects discharge chute, the charged cylinder of vortex air flow with relevant wind discharge valve is set between discharge chute in order to material is sent into discharge chute continuously, the electrostatic separation space be made up of positive electrode plate and negative electrode plate below discharge chute, at positive electrode plate, under the effect of negative electrode plate, the plastic grain of lotus opposite charges in mixed plastic is separated.
More preferably, described positive electrode plate, negative electrode plate are provided with pole plate and regulate rotating shaft, in order to regulate the angle of positive and negative electrode plate; The angle 0-90 degree of positive and negative electrode plate is adjustable.
More preferably, it is 5kV – 60kV that described positive electrode plate, negative electrode plate apply voltage, and electric current is 2mA – 5mA.
Operation principle of the present invention: mixed plastic particles moves in the charged cylinder of vortex air flow together with high speed vortex air flow (air velocity 15m/s ~ 20m/s), collide between particle and particle in the charged cylinder of vortex air flow, particle and the charged cylinder wall of vortex air flow collide, collision makes variety classes plastic grain lotus opposite charges; The particle of oppositely charged enters free-falling between electric field region, be subject to the compound action of electric field force and gravity, electric field force and Action of Gravity Field shape on particle is at a certain angle, and in dropping process, the particle of positively charged attracts by negative pole, deflection negative pole, fall into positive electricity collecting region, electronegative particle attracts by positive pole, deflection positive pole, fall into negative electricity collecting region, thus realize the separation of mixed plastic particles.
Compared with prior art, the present invention has following beneficial effect:
Four toothed roller types that the present invention adopts are broken-at a high speed pulverizings-vortex air flows charged-high-pressure electrostatic separation method and the complicated fragmentation of multistep after density contrast wet concentration, wind-force flotation ratio, there is the features such as cost is low, efficient, structure is simple, pollution-free, minimizing environmental pollution; The present invention is without the need to waste or used plastics identification operation, and treating capacity is high, is easy to commercial Application; In the present invention, four toothed roll crushers, high speed impact pulverizer, the charged cylinder of vortex air flow and high-pressure electrostatic separation equipment composition closed system, adopt conveyer belt to carry out the transmission of material between system, whole system is carried out under air-proof condition, three-waste free discharge, reduces environmental pollution.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the flow chart of the inventive method;
Fig. 2 is the charged schematic diagram with high-pressure electrostatic separation method of vortex air flow in the present invention;
In Fig. 2,1 is hybrid particles charging aperture, and 2 is the charged cylinder of vortex air flow, and 3 is centrifugal pump, and 4 for closing wind discharge valve, and 5 be discharge chute, and 6 is positive electrode plate, and 7 is negative electrode plate, and 8 is the plastic grain of bear electricity, and 9 is the plastic grain of lotus positive electricity, and 10 is pole plate adjustment rotating shaft.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
As shown in Figure 1, the present embodiment provides a kind of fragmentation and high-pressure electrostatic separation method of waste or used plastics, comprise Mechanical Crushing is carried out to waste or used plastics, the particle of fragmentation is pulverized further, hybrid particles is friction charged and carry out high-pressure electrostatic and be separated four operations, concrete:
Step one, first with conveyer belt, waste or used plastics product A, B are transported to four toothed roll crushers, waste or used plastics are broken into the fragment that granularity is 5mm-10mm;
Step 2, adopt conveyer belt that the waste and old plastic fragment that granularity is 5mm-10mm is transported to high speed impact pulverizer again, further waste or used plastics is ground into the particle of 0.8mm-2mm;
Step 3, then pulverized particle is sent into the charged cylinder of vortex air flow, be transported in the charged cylinder of vortex air flow by the vortex air flow produced by centrifugal pump, particle, with the motion of high speed vortex air flow, collides between particle and particle, particle and vortex air flow charged cylinder wall collides and charged in the charged cylinder of vortex air flow;
The charged cylinder of vortex air flow described in the present embodiment, by air inlet, exhaust outlet, top cylinder and bottom are bored cylinder and are formed, air flow power is produced by centrifugal pump, air-flow, under the effect of centrifugal pump, is entered by exhaust outlet, in top cylinder, form contour stealth, inward eddy is formed at bottom cone cylinder and top cylinder near axis, plastic grain enters in charged cylinder with air-flow, and contour stealth makes particle and tube wall occur to rub fast, and inward eddy makes to form collision and friction between particle and particle.
Step 4, charged particle enter discharge chute by closing wind discharge valve, and the particle through discharge chute vertically falls into the electrostatic separation space of high-pressure electrostatic separation equipment; Electrostatic separation space is made up of the positive and negative electrode plate of opposite polarity, and it is 5kV – 60kV that positive and negative electrode plate applies voltage, and electric current is 2mA – 5mA, and the angle of positive and negative electrostatic pole plate regulates rotating shaft 0-90 degree adjustable by pole plate; Positive electrode plate produces sucking action to the plastic grain A of bear electricity, plastic grain A is made to fall into negative electricity collecting region, negative electrode plate produces sucking action to the plastic grain B of lotus positive electricity, makes plastic grain B fall into positive electricity collecting region, thus realizes the separation of mixed plastic particles.
The vortex air flow that the present embodiment adopts is charged with high-pressure electrostatic separation method as shown in Figure 2, and the waste or used plastics particle being first 0.8mm-2mm granularity is positioned over hybrid particles charging aperture 1; Start centrifugal pump 3, the vortex air flow produced is transported to plastic grain in the charged cylinder 2 of vortex air flow, plastic grain moves with high speed vortex air flow, collide between plastic grain in the charged cylinder 2 of vortex air flow, plastic grain and vortex air flow charged cylinder 2 wall collide and charged, form the plastic grain 8 of bear electricity and the plastic grain 9 of lotus positive electricity; The plastic grain 8 of bear electricity and the plastic grain 9 of lotus positive electricity enter discharge chute 5 by closing wind discharge valve 4, vertically fall into electrostatic separation space through the plastic grain 8 of the bear electricity of discharge chute 5 and the plastic grain 9 of lotus positive electricity; Electrostatic separation space is made up of the positive electrode plate 6 of opposite polarity and negative electrode plate 7; The plastic grain 8 of positive electrode plate 6 pairs of bear electricity produces sucking action, the plastic grain 8 of bear electricity is made to fall into negative electricity collecting region, the plastic grain 9 of negative electrode plate 7 pairs of lotus positive electricity produces sucking action, makes the plastic grain 9 of lotus positive electricity fall into positive electricity collecting region, thus realizes the separation of mixed plastic particles.
In the present embodiment, positive electrode plate 6 and negative electrode plate 7 apply that voltage is 5kV – 60kV, electric current is 2mA – 5mA,
In the present embodiment, positive electrode plate 6 and negative electrode plate 7 angle regulate rotating shaft 10 to regulate (angle 0-90 degree is adjustable) by pole plate;
In the present embodiment, according to the kind of waste or used plastics and broken granularity requirements can be needed, determine the technological parameter of four toothed roll crushers and high speed impact pulverizer, the rotating speed of high speed impact pulverizer be 2900 revs/min and more than.
Four toothed roller types that the present embodiment adopts are broken-at a high speed pulverizing-vortex air flows charged-high-pressure electrostatic separation method, there is the features such as cost is low, efficient, structure is simple, pollution-free; The present embodiment is without the need to waste or used plastics identification operation, and treating capacity is high, is easy to commercial Application; The present embodiment forms closed system by four toothed roll crushers, high speed impact pulverizer, the charged cylinder of vortex air flow and high-pressure electrostatic separation equipment, conveyer belt is adopted to carry out the transmission of material between system, whole system is carried out under air-proof condition, three-waste free discharge, reduces environmental pollution.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (6)
1. the fragmentation of a waste or used plastics and high-pressure electrostatic separation method, it is characterized in that, the method comprises: carry out Mechanical Crushing to waste or used plastics, pulverize further the particle of fragmentation, hybrid particles is friction charged and carry out high-pressure electrostatic and be separated four steps, concrete:
Step one, first with conveyer belt, waste or used plastics product is transported to four toothed roll crushers, waste or used plastics is broken into the fragment that granularity is 5mm-10mm;
Step 2, adopt conveyer belt that the waste and old plastic fragment that granularity is 5mm-10mm is transported to high speed impact pulverizer again, further waste or used plastics is ground into the plastic grain of 0.8mm-2mm;
Step 3, then pulverized plastic grain is transported in the charged cylinder of vortex air flow by the vortex air flow produced by centrifugal pump, plastic grain, with the motion of high speed vortex air flow, collides between plastic grain, plastic grain and vortex air flow charged cylinder wall collides and charged in the charged cylinder of vortex air flow;
Step 4, charged plastic grain enter discharge chute by closing wind discharge valve, and the plastic grain through discharge chute vertically falls into electrostatic separation space; Electrostatic separation space is made up of the positive electrode plate of opposite polarity, negative electrode plate, under the effect of positive and negative electrode plate, the plastic grain of lotus opposite charges in mixed plastic is separated, namely positive electrode plate produces sucking action to the particle of bear electricity, negative electrode plate produces sucking action to the particle of lotus positive electricity, obtain the plastic grain of one-component, thus realize the separation of mixed plastic particles;
The charged cylinder of described vortex air flow is by air inlet, exhaust outlet, top cylinder and bottom are bored cylinder and are formed, and air flow power is produced by centrifugal pump, and air-flow is under the effect of centrifugal pump, entered by exhaust outlet, in top cylinder, form contour stealth, form inward eddy at bottom cone cylinder and top cylinder near axis, plastic grain enters in charged cylinder with air-flow, contour stealth makes particle and tube wall occur to rub fast, and inward eddy makes to form collision and friction between particle and particle.
2. the fragmentation of a kind of waste or used plastics according to claim 1 and high-pressure electrostatic separation method, it is characterized in that, in step one and step 2, according to the kind of waste or used plastics and the granularity requirements of needs fragmentation, determine the technological parameter of four toothed roll crushers and high speed impact pulverizer, the rotating speed of described high speed impact pulverizer be 2900 revs/min and more than.
3. the fragmentation of a kind of waste or used plastics according to claim 1 and high-pressure electrostatic separation method, it is characterized in that, step 3 and step 4 pass through vortex air flow, and charged-high-pressure electrostatic separator realizes, this device comprises: hybrid particles charging aperture, the charged cylinder of vortex air flow, centrifugal pump, close wind discharge valve, discharge chute, positive electrode plate, negative electrode plate, wherein: centrifugal pump is arranged at the top of the charged cylinder of vortex air flow, hybrid particles charging aperture is arranged at the top of the charged cylinder side of vortex air flow, the bottom of the charged cylinder of vortex air flow connects discharge chute, the charged cylinder of vortex air flow with relevant wind discharge valve is set between discharge chute in order to material is sent into discharge chute continuously, the electrostatic separation space be made up of positive electrode plate and negative electrode plate below discharge chute, at positive electrode plate, under the effect of negative electrode plate, the plastic grain of lotus opposite charges in mixed plastic is separated.
4. the fragmentation of a kind of waste or used plastics according to any one of claim 1-3 and high-pressure electrostatic separation method, is characterized in that, described positive electrode plate, negative electrode plate is provided with pole plate and regulates rotating shaft, in order to regulate the angle of positive and negative electrode plate.
5. the fragmentation of a kind of waste or used plastics according to any one of claim 1-3 and high-pressure electrostatic separation method, is characterized in that, the angle 0-90 degree of described positive electrode plate, negative electrode plate is adjustable.
6. the fragmentation of a kind of waste or used plastics according to any one of claim 1-3 and high-pressure electrostatic separation method, is characterized in that, it is 5kV – 60kV that described positive electrode plate, negative electrode plate apply voltage, and electric current is 2mA – 5mA.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104708731B (en) * | 2015-03-25 | 2017-03-01 | 上海交通大学 | The separation and recovery method of PVC in waste and old mixed plastic |
| CN106514903A (en) * | 2016-12-04 | 2017-03-22 | 重庆精榜高分子材料有限公司 | Plastic granular material recycling device |
| CN109603971A (en) * | 2018-12-04 | 2019-04-12 | 青海泰宁水泥有限公司 | It is used to prepare the device and method laid bricks with cement grinding aid |
| CN109806935B (en) * | 2019-01-30 | 2021-06-15 | 上海卫星工程研究所 | Space debris processing method based on in-situ utilization |
| CN111300687A (en) * | 2019-10-22 | 2020-06-19 | 湖南绿营环保科技有限公司 | Environment-friendly plastic bottle recycling method |
| CN110756335A (en) * | 2019-11-07 | 2020-02-07 | 中国矿业大学 | Device and method for recovering metal from waste circuit board fine-grained crushed product |
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| CN88100769A (en) * | 1987-02-17 | 1988-09-07 | 奥尔根菲瑟尔技术公司 | From rubbish, separate insulating properties material fragment, particularly separating plastic and/or a kind of method of paper and the equipment of realizing this method |
| CN101011681A (en) * | 2006-02-05 | 2007-08-08 | 中国矿业大学 | Fine granule material friction electrical selection method and device |
| CN102574304A (en) * | 2009-10-02 | 2012-07-11 | 日立造船株式会社 | Method and facility for sorting and separating waste plastic |
| CN103182345A (en) * | 2011-12-29 | 2013-07-03 | 上海盛致塑胶科技有限公司 | Waste plastic separation system |
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| JP2008096322A (en) * | 2006-10-13 | 2008-04-24 | Shimadzu Corp | Particle classifier |
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| CN88100769A (en) * | 1987-02-17 | 1988-09-07 | 奥尔根菲瑟尔技术公司 | From rubbish, separate insulating properties material fragment, particularly separating plastic and/or a kind of method of paper and the equipment of realizing this method |
| CN101011681A (en) * | 2006-02-05 | 2007-08-08 | 中国矿业大学 | Fine granule material friction electrical selection method and device |
| CN102574304A (en) * | 2009-10-02 | 2012-07-11 | 日立造船株式会社 | Method and facility for sorting and separating waste plastic |
| CN103182345A (en) * | 2011-12-29 | 2013-07-03 | 上海盛致塑胶科技有限公司 | Waste plastic separation system |
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