299 results about "Electrostatic separation" patented technology

An electrostatic separation system for separating fine metal and plastics is disclosed. An electrostatic separation system according to the present invention comprises a negative electrostatic induction plate and positive metal net made of special materials, which have appropriate dimensions and an appropriate space between them to improve separation efficiency, and a separating plate which is appropriately positioned to improve separation efficiency. The electrostatic separation system has processing capacity more than 5 times in comparison to conventional electrostatic selection systems and is able to separate fine particles of 0.1 mm in size. In addition, the electrostatic separation system has wide application in recycling other useful recourses as well as separating the mixture of fine particle metal and non-metal materials.

The invention discloses a process for preparing ultrahigh pure quartz sand through a silica raw material. The silica raw material is treated in such procedures to produce ultrahigh pure quartz sand with SiO2 content larger than 99.995% as manual sorting, calcining, water quenching, crushing, magnetic separation, electrostatic separation, ultrasonic pickling, flotation, ultrasonic alkali washing, drying, secondary magnetic separation, high temperature chlorination, dehydroxylation treatment and the like, and organic alkali washing, electrostatic separation, secondary magnetic separation, dehydroxylation treatment and high temperature chlorination are particularly added. The process for purifying quartz sand provided by the invention is obvious in effect, high in product purity, low in production cost increase and capable of meeting the requirements of such industrial production on raw materials as quartz glass, etc.

The invention provides a treatment method for a waste printed circuit board, which comprises the following steps of: wet sealing-off treatment, separation of lead and tin, rough crushing, magnetic separation of iron, vortex separation, fine crushing and separation of fine nonmetal powder, electrostatic separation of metal and nonmetal in coarse mixture, recovery of heat energy through fire burning and harmless treatment of harmful tail gas. The invention combines wet sealing-off, decomposing classification and fire burning to reasonably recover usable resources, and is environment-friendly.

The invention provides a preparation method of wheat bran aleurone which is prepared by taking wheat bran as raw material. The preparation method comprises the following steps of: removing impurities, precrushing, predrying/prefreezing, crushing at low temperature, enriching, carrying out air classification and grading or high-voltage electrostatic separation, sterilizing and packaging to obtain an aleurone finished product, wherein the operations of removing impurities and enriching are carried out in a spin-vibration screen, the operation of crushing at low temperature is carried out through a turbo type crusher at the crushing temperature ranging from 15 DEG C below zero to 10 DEG C, and the operation of high-voltage electrostatic separation is carried out in a high-voltage direct-current electrostatic field. As a dry method for machining and treating, the method provided by the invention can be used for remaining the nutritional ingredients of the aleurone to the maximum extent and is good in separation effect for an aleurone layer, high in purity of the prepared aleurone finished product, simple in process flow and low in production cost.

Disclosed is a method for flax seeds decortication and separation, comprising dehydrading flax seeds to a moisture percentage of 2-4%; feeding same into a rotary centrifugal decortication machine continuously, decorticating the flax seeds to form a mixture of shells and kernels; and separating the shells and kernels mixture through an electrostatic field. An apparatus realizing said method comprises a centrifugal decortication machine, screen means mounted on the discharge side of the centrifugal decortication machine, a convey belt mounted on the discharge side of the screen, and electrostatic absorption means mounted over the discharge terminal of the convey belt front part. The method is provided with continuously industrialization production for large amounts of product, complete seperation of shells and kernels, and high production efficiency to shorten the art time from the flax seeds feeding, decorticating to discharging by 80%, decrease full cost by 50%, and produce no environmental waste materials.

The invention discloses a waste PCB (printed circuit board) crushing and sorting system. The waste PCB crushing and sorting system comprises a disassembling unit, a crushing unit, a primary air classification unit, a deferrization unit, a grinding unit, a fine deferrization unit, an air classification separating unit, a high-voltage electrostatic separation unit, a dust and waste gas disposition unit and a central control unit, wherein a circuit board is disassembled and crushed, and then is subjected to procedures such as primary air classification, primary deferrization, grinding, secondary deferrization, air classification separating and high-voltage electrostatic separation, and a copper-containing metal concentration with the purity of 99.5% is obtained. The waste PCB crushing and sorting system provided by the invention is used for recovering available resources in a waste PCB plate treating process, treating the waste PCBs in scales, efficiently recovers resources, and avoids the environment pollution.

A method and apparatus for recovering mercury control reagents from particulate materials is disclosed. The particulate materials include fly ash mixed with mercury control reagents collected from boiler flue gases. The particulate materials are provided to an electrostatic separation system, which is operated under predetermined conditions so as to produce a concentrated stream of the mercury control reagent and a diluted stream containing minimal mercury control reagent.

The invention discloses a resourceful comprehensive utilization method of waste printed circuit boards. The method comprises the following steps: crushing waste printed circuit boards and carrying out magnetic separation to obtain ferrous raw materials and non-ferrous raw materials; carrying out high-voltage electrostatic separation on the non-ferrous raw materials to obtain metallic materials and non-metallic materials; and separating such metals as copper, gold and silver from the metallic materials. By adopting the method disclosed by the invention, such valuable metals as copper, tin, aluminum, iron, lead, gold and silver and metal slag containing nickel and zinc in the waste printed circuit boards can be recovered and the materials such as non-metallic resin can also be recovered. By adopting the resourceful comprehensive utilization method, the problems of environmental pollution caused by the waste printed circuit boards and the like are solved and the resourceful comprehensive utilization of the waste printed circuit boards is achieved. The method is simple in process and is economical and practical and industrialization is easy to implement.

The invention relates to a worn-out electronic circuit plate mechanical disintegration and electrostatic separation recovery processing technique and its using equipment. The processing steps include the following steps: crushing worn-out electronic circuit plate; intermediate crushing after removing iron; fine crushing; dividing part nonmetal matter by ultra-micro classifier; sending to high voltage electrostatic separator to from finished product. The equipment includes brute force crusher, magnetic separator, intermediate crusher, fine crusher, ultra-micro classifier, and high voltage electrostatic separator. Its advantages are good crushing dissociation, good reclaiming effect, low energy consumption, long using life and no secondary pollution.

A preparation method of Waspalloy spherical powder for additive manufacturing includes the steps of conducting alloy component compounding according to AMS 5706 standards and subjecting master ingots to vacuum melting twice; producing the master ingots into alloy electrode bars by means of forging and machining; subjecting an atomizing unit to pre-vacuum-pumping treatment, and feeding the atomizing unit with mixed inert protective gas; feeding the electrode bars into an atomizing chamber by a feeding system, heating electrode bar end faces by a plasma torch, preparing metal liquid droplets under the centrifugal action of a rotating electrode, and making the metal liquid droplets form spherical metal powder by flash setting; using a powder collecting device comprising an electrostatic separation component for removing inclusions of the spherical metal powder and collecting purified powder. The preparation method has the advantages of high production efficiency, high batch stability and high -270-mesh powder yield and can be used for easily preparing the Waspalloy spherical powder high in purity, sphericity and fluidity.

The invention discloses processes for preparing and purifying quartz sand and quartz powder and products thereof. The process for preparing and purifying quartz sand comprises the following steps: carrying out rough concentration on vein quartz green ores, crushing, roasting, quenching with water, grinding and grading, carrying out high-gradient magnetic separation, carrying out a complex reaction by using drugs, carrying out floatation, carrying out electrostatic separation, washing with deionized water, and drying to obtain the product. The process for preparing and purifying quartz powder comprises the following steps: carrying out rough concentration on vein quartz green ores, crushing, roasting, quenching with water, grinding and grading, carrying out high-gradient magnetic separation, carrying out a complex reaction by using drugs, treating with microwaves, carrying out electrostatic separation, washing with deionized water, and drying to obtain the product. The quartz sand and the quartz powder produced by using the processes provided by the invention do not bubble in the production process of glass and chips, optical fibers and cables can not break, and the glass does not have water grains. The quartz sand and the quartz powder have widened the application fields, and are applicable to the fields of monocrystalline silicon, polycrystalline silicon, optical fibers and cables, war industry, fine chemical industry and micro-electronics.

A method for recycling noble metals from electronic waste materials and apparatus thereof. The method comprises the following steps: mechanically breaking up the electronic waste materials; removing rubber and plastic materials by electrostatic separation; removing ferromagnetic metals by magnetic separation; removing residual rubber and plastic materials by microwave pyrolysis; removing low-melting-point metals by indirectly heating using microwave; separating the noble metals from one another in turn from low-melting-point metal to high-melting-point metal for recycle. The apparatus includes a microwave housing. A filtering screen is positioned on the inside wall of the housing horizontally, and vertically-arranged and open-ended heating pipes are positioned over the filtering screen. The method and apparatus can adequately recycle resources in the electronic waste materials.

The invention discloses a method for collaborative resource between a waste circuit board and an automobile tail gas waste catalyst. The method comprises the following steps: firstly, obtaining a copper-rich collective through performing crushing, magnetic separation and high voltage electrostatic separation on the waste circuit board; crushing the automobile tail gas waste catalyst to obtain waste catalyst powder; mixing the copper-rich collective and the waste catalyst powder to obtain mixed powder; adding a reagent in a certain amount of mixed powder in proportion, placing in a high-temperature muffle furnace for reaction and cooling to a room temperature after the completion of the reaction to obtain a product of which an upper layer is a glass layer, and a lower layer is a copper layer; separating the copper layer from the glass layer, taking out, crushing, then placing the glass layer in the muffle furnace for heat treatment; after the completion of the treatment, pouring microcrystalline glass liquid into a mold while the microcrystalline glass liquid is still hot, reducing the temperature and forming; after a room temperature is lowered, preparing out fluorescent microcrystalline glass. In the process, the recovery rate of precious metals exceeds 98 percent, the precious metals are enriched for 20 times or more, and the obtained fluorescent microcrystalline glass can betaken as an LED fluorescent lamp and other materials. To sum up, the method has the characteristics of being efficient, environmentally friendly and high in resource degree and is suitable for large-scale industrial application.

The invention relates to a preparation method of superfine high-grade spherical EP741NP alloy powder. The method comprises the following steps: 1) proportionally preparing materials according to the EP741NP alloy composition, and smelting to obtain an EP741NP alloy bar; 2) processing the smelted EP741NP alloy bar into an electrode bar; 3) installing the electrode bar into a reaction chamber, vacuumizing the reaction chamber, and proportionally charging inert gas into the reaction chamber; 4) heating the end of an electrode bar to uniformly melt the end, throwing atomized liquid drops from the end of the electrode bar so that the liquid drops are quickly cooled into spherical particles in an inert gas atmosphere and fall into a collector, wherein a plasma torch comprises a tungsten cathode and a copper anode, and the electrode bar is not used as an electrode; and 5) carrying out electrostatic separation on the prepared EP741NP alloy powder in an inert gas protective atmosphere, screening, sampling and packaging. The EP741NP alloy powder prepared by the method is superfine, and has the characteristics of high purity, high-grade sphericity and no hollow powder or satellite powder.

The invention relates to a method and a device for injection electrostatic separation, which are used for separating superfine materials which consist of conductor particles and nonconductor particles. The device mainly comprises a high-pressure electrostatic generator, a high-pressure draught fan, a suspension mixing cavity, a corona cavity, a gas-liquid nozzle, a discharge polar plate, a separation cavity, a separation electrode, a material receiver, a frame, an insulating plate, a metal protective net and the like. The principle of the method and the device is to suspend powder into gas phase flow and solid phase flow, to make solid particles have saturated charge through a corona electric field, to inject the solid particles to the discharge polar plate through the gas-solid nozzle, to achieve the effect that the conductor particles completely discharge but the nonconductor particles almost do not discharge, and to finally complete separation according to the difference of the charge of the particles. The device has definite principle, a simple structure, convenient use and good separation effect, completely solves the worldwide problem of separation of the superfine particles (such as rutile), has the advantages of small fixed investment, low operation cost, small resource consumption and no generation of environmental pollution, and can be widely used in the fields of ore dressing, milling, coal preparation, resource recovery and utilization and the like.

In one embodiment, apparatuses and methods for collecting particulates use an aperture air flow control system and an inline series of alternating discharge and grid type electrodes each with a separate electrical circuit centrally located between either parallel grid electrodes or plate electrodes. In another embodiment, an external enclosed pre-discharger design and physical arrangement improves agglomeration of sub-micron particles. In yet another embodiment, an external opposing dual channel discharger design also improves agglomeration of particles. In another embodiment, two or more separate electrode arrangements are used within a collecting chamber to improve the operation and collection efficiency of the apparatus. The present invention also preferably increases the frequency of recharging the particles, to increase collection efficiency. In one embodiment, the collection chamber includes both a recharging zone and a high voltage zone followed by a series of fields separated by agglomerating recharging units.

The invention relates to a method for recovering a copper alloy from a waste circuit board to reproduce a sintered metal product circularly and a device system thereof. In the method, the waste circuit board on electronic equipment is subject to breaking, magnetic separation, crushing, mechanical separation and electrostatic separation to separate the waste circuit board into copper alloy powder and plastic glass powder. The method further comprises the following steps: X1) further purifying and refining the obtained copper alloy powder to prepare more purified and finer superfine copper alloy powder; X2) filling the superfine copper alloy powder into a product die for die pressing; and X3) stepwise sintering a pressed compact obtained by die pressing to obtain a powder metallurgy finished product. The method and the device system can perform pre-treatment on the waste circuit board to obtain the copper alloy powder by separation, and can perform effective subsequent treatment on the copper alloy powder obtained by separation to make a marketable product, and the treatment process is environment-friendly, economical and efficient.

The invention provides a plastic sorting method and apparatus, which, when plastic pieces comprising a plurality of types of resin plastics are agitated and frictionally charged, are able to impart the plastic pieces a necessary amount of charge or polarity for the thorough separation even if the difference in the amount of the different types of plastic pieces is large and to increase the recovery rate. If the amount of a specified type plastic pieces(1)to be recovered is small, the agitation and the electrostatic separation is carried out after adding the specified type plastic pieces(1)as auxiliary frictional charging material(21)into the frictional charging device(3), and the auxiliary frictional charging material(21)remains in the frictional charging device(3)and is used repeatedly.

An electrostatic separation apparatus for conductive particles and insulating particles with reduced separation time and improved separating capability, comprises a substantially flat-plate shaped bottom electrode (26) provided on lower side, a substantially flat-plate shaped mesh electrode (22) provided above the bottom electrode (26) as spaced a predetermined distance apart from the bottom electrode (26) and having a number of openings (24) to allow particles to pass therethrough, a direct current power supply connected to at least one of the mesh electrode (22) and the bottom electrode (24), and a voltage is applied across the bottom electrode (22) and the mesh electrode (24), thereby forming a separation zone (10) between the electrodes.

The invention discloses a crushing machine for separating crushed materials. The crushing machine comprises a machine body, wherein the machine body is internally provided with a crushing chamber and a separation chamber; a feeding hole is connected with the crushing chamber through a feeding channel; a heating device is arranged inside the feeding channel; the crushing chamber is internally provided with a stirring and crushing device; the stirring and crushing device comprises a fixed screw rod and a crushing screw rod; a motor is connected to one end of the crushing screw rod; spiral cutters A are arranged on the fixed screw rod; spiral cutters B are arranged on the crushing screw rod; a filtering net is arranged at the opening of the lower end of the crushing chamber; the separation chamber comprises a centrifugal pump, a separation cylinder and a separation device; the separation cylinder is electrified; the separation device comprises a material discharge groove, a positive electrode plate, a negative electrode plate and a microcomputer controller; an electrostatic separation space consisting of the positive electrode plate and the negative electrode plate is arranged below the material discharge groove. According to the crushing machine for separating crushed materials, plastic can be molten by using hot air, so that abrasion to the crushing cutters can be reduced, and the processing efficiency and the processing quality can be improved; as different crushed materials are separated by using high-pressure static electricity, the crushing machine has the characteristics of low cost, high efficiency, no pollution, and the like.

The invention provides a comprehensive treatment method for a waste liquid crystal display, and the method comprises the steps of: (1) simply dismantling; (2) removing polarizers; (3) separating liquid crystal: using an organic solvent to dissolve the liquid crystal to separate the liquid crystal away from a glass substrate, and collecting the liquid crystal after distillation; (4) separating a glass sheet from a coating, wherein the glass sheet is made to be glass-ceramics after being washed; (5) recovering indium from the coating: mixing the scraped oxide coating with ferric sulfate, calcining in an oxidation atmosphere at a temperature of 500-600 DEG C, and then soaking in water to obtain a solution containing indium sulfate; after replacement, filtering to obtain indium with a purity of more than 95.6%, and returning filtrate B to water soaking; and dissolving residue A in sulfuric acid, filtering to obtain tin oxide in residue C, and filtrate C can be concentrated for crystallization to obtain ferric sulfate for calcination; (6) sorting plastic; and (7) sorting metal and nonmetal components by using electrostatic separation. According to the present invention, indium in liquid crystal displays can be completely recycled, and therefore integrated treatment and recycling of a waste liquid crystal display are obtained.