Research Projects

 

Project 1: Design of Waste Electric and Electronic Recycling Project

Introduction:The project is to provide development situation of electronic waste dismantling and recycling industry at home and abroad for strategic planning and decision-making guidance, to provide project feasibility study report, project proposal, application materials, and bidding materials and etc. It also provides process design for normalized treatment, equipment selection and plant design to guarantee safety, environmental protection and economy. The project may jointly tackle the problems like the recycling technology of new electronic waste and the components which are not easy to dispose.

Fields of Application:Design and construction of electronic waste dismantling, physical separation, treatment and disposal, and other technical processes, scheme design for metal and non-metal recycling technology, technical design for office equipment and consumables remanufacturing and etc.

 

Project 2: The Green Method of Recycling Heavy Metals from the Sludge by the Microbiology

Introduction:The microbiology is used to recover valuable metals including Cu, Zn, Ni, and etc. from heavy-metal sludge and contaminated sites with high concentration of heavy-metals to achieve detoxification of heavy-metal sludge and repair of contaminated soil.




Fields of application: Industrialized repair for soil contaminated by Cu, Zn, Ni and other high-concentration heavy-metals as well as detoxification of industrial sludge.

 

Project 3: Metal Extraction Processes from Etching solution and Electronic Waste

Introduction:High-efficient extraction of nonferrous metals and noble metals from Etchants and electronic waste leachates can guarantee the recycling of the etchants and the leachates. One patent has been granted: A method and special devices for the recycle acid etchants and copper recovery. Patent No.: ZL200910214606.4

Fields of application:Recovery of acid and alkaline etching solutions as well as electronic waste leachates. 






Project 4: The Detoxification and Recycling of Hazardous Wastes such as Waste Leaded Glass and Zinc-Containing Residue

 

Introduction:Disposing waste CRT glass and zinc-containing residue with mechanochemical process andalkalinewet process can directly produce high-purity lead powder or zinc powder. The whole process is featured by high adaptability of raw materials, simple process, high metal recovery rate, and less pollution. There are five applied or granted patents: a method to extract lead from alkaline leachate of waste leaded glass (Patent Application No.:CN104593602A); a mechanochemical sulfidization hydrometallurgical treatment on waste CRT funnel glass(Patent Application No.:CN104607284A); a process to recover lead from waste leaded glass with mechanochemical reduction (Patent Application No.:CN104120444A); a leaded glass recycling production line (Patent Application No.: CN10464913B); and the leaching of zinc from wastes or lean ores bearing ferric zinc by alkaline solution (Patent Application No.: CN102534208).





Fields of application: Recycling of waste CRT including leaded glass, lean miscellaneous zinc ore, zinc and lead ash, and soot containing zinc and lead, etc.

 

Project 5: The Recycling Technology of Polyurethane Waste

Introduction:Polyurethane waste is decomposed into LMW products via chemical method to extract polyols which can be used to prepare regenerated polyurethane materials. During the reaction, with water as the solvent and a low reaction temperature, this technology is environment-friendly and energy-saving. One applied invention patent is a method to recover polyols from waste polyurethane materials (Patent Application No.:CN103275349A).





Fields of application: Recycling of various waste polyurethane foams and elastic bodies.

 

Project 6: Materials Separation and Recycling Technology for Waste LCD Panel 

Introduction:The technology can effectively separate polarizer and glass substrate from LCD panel combined with mechanical and manual operation. The rare and noble metal indium contained in the separated glass substrate can be recovered by acid leaching assisted with ultrasound technology. This technology is featured by low energy consumption and no secondary pollution. One applied invention patent is a device used for separating and recycling the glass and polarizer from the waste LCD panel (Patent Application No.:CN104793369A).

Schematic diagram of the separation device for polarizer and glass from cushed waste Liquid Crystal Displays

*(1) Blender (2) Water injection pipe (3) Motor (4) Removable table

 (5) Water storage (10, 11) Separation tank (12, 13) Collection tank



Fields of application:Electronic waste dismantling enterprises or regions with a higher scrappage of LCDs.

 

Project 7: Selective Recovery of Various Metals from Waste PCB with Chemical Method 

Diagram: 



Surface Appearance Comparison of Mobile Circuit Board before and after Metal Separation



Introduction:Thenoble metal components on waste PCB are recovered with chemical method. And under different technical formula conditions, metals like copper, zinc, tin, nickel, silver and gold are extracted selectively or sequentially. Such simple technology with low cost avoids large usage of strong acid, which improves the operating environment. Six related invention patents have been applied or granted: a leaching solution for gold in electronic waste (Patent No.:ZL 201410166230.5); a method for recovering metals from waste PCB by sequential leaching with ionic liquid (Patent Application No.: CN104775034A); a method to recover tin and lead from wasted PCB (Patent Application No.: CN105525099A); a method to selectively strip the metal gold from waste PCB surface (Patent Application No.: CN105154680A); a method to selectively leach and recover the gold from PCB surface coating (Patent Application No.: CN105200240A); and a method to extract silver from waste circuit boards (Patent Application No.: CN104988317A).

Fields of applicationMetal and noble metal extraction from various waste PCB

 

Project 8:Green Dismantling Technology of Electronic Components from Waste Printed Circuit Boards

Diagram:


Sketch of Welding Components Removal from Circuit Board



Introduction:The welding components can be removed after the lead-tin solder is dissolved from the waste PCB by applying the acid solution of a green chemical oxidant to separate and recover the electronic components from PCB substrate. This technology is featured by short dismantling time, quick welding dissolution, environment friendliness, high security, and less pollution. The recovered acid solution can be used as plating solution, and its by-products after dismantling will be recycled. Two invention patents have been applied and published: a wet dismantling process of waste PCB (Patent Application No.: CN104625286A), and a method to dismantle the welding components of waste PCB (Patent Application No.: CN103934536A).

Fields of application:Removal of components from various waste PCB (circuit boards).

 

Project 9: APneumatic Dismantling Method and Device for Waste Mobile Phones

Diagram:



Pneumatic Dismantling Device for Waste Mobile Phones


Introduction:This technology is used to dismantle mobile phones by creating a pressure difference inside and outside the mobile phone shell in order to crush its shell from the inside. The whole process is environment friendly with no toxic and harmful substances produced, realizing the efficient and environment friendly dismantling of waste mobile phones in bulk. This greatly increases the efficiency of mobile phone dismantling and reduces the labor cost in electronic waste dismantling enterprises. One applied invention patent is a pneumatic dismantling device for waste mobile phones (Patent Application No.:CN105196035A).

Fields of application:Dismantling of various waste mobile phones.

 

Project 10: The Toxicity Effects of Polybrominated Diphenyl Ethers (PBDEs) Exposure

Introduction:The main pollution source of brominated flame retardant, polybrominated diphenyl ethers (PBDEs) is electronic waste and the production of PBDEs, especially in southeast China. The neurotoxicity of PBDEs has attracted researchers' attention in recent years. This project carries out a study on the effects on vision and visually guided behaviors in larval zebrafish by its exposure to the PBDEs so as to explore the ecological consequences caused by the exposure to the survival and reproduction of aquatic organisms. The research achievements can provide not only useful information for neurobehavioral toxicity effect of PBDEs and mechanism research, but also important basic data and theoretical basis for PBDEs risk assessment and management.

Fields of application:Ecological risk of environmental pollutants and assessment of human health.

 

Project 11: Combined treatment of thallium contained in wastewater by microbiological chemical method

Introduction:The method is to remove the toxic heavy metal thallium contained in the wastewater by combining biological agents with chemical mixed precipitant. The removal rate is over 99.9%.Based on the emission limit of 0.005 ppm and the requirements of economy and environmental protection, this method can be used to treat the wastewater with the initial maximum thallium concentration of 4 ppm.This method avoids the use of a large number of reagents and can quickly realize the up-to-standard release of the wastewater containing thallium. One applied patent is an advanced treatment method of wastewater containing thallium in the manufacturing and metallurgical process of electronic products whosePatent Application No.is 201610294976.3.

Fields of application:Electronic products manufacturing, advanced treatment of waste electrical and electronic equipment, electroplating, metallurgy, mining and others related to the up-to-standard release of the wastewater containing thallium.

 

Project 12: Investigation and Restoration of Soil Pollution in Electronic Waste Dismantling Site

Introduction:Because of poor management or inadequate pollution control measures, many industrial sites are polluted by heavy metals or organic matters. With the promulgation and implementation of our site standards, it is necessary to conduct pollution investigation, health risk assessment and restoration of the existing industrial sites. At present, laboratory analysis, remediation technique test as well as field bioremediation of soil pollution investigation and remediation of electronic waste disposal sites and some mining areas and etc. are carried out. There is a biological leaching technology for the soil polluted by heavy metals with ultra-high concentration.

Field of application:investigation and restoration of soil pollution in some mining areas or electronic waste dismantling sites.

 

Project13: Benefit Evaluation and Modeling of Carbon Emission Reduction of Electronic Waste Recycling

Introduction:This is to analyze typical e-waste recycling process and the key sources of carbon emissions and carbon emission reduction based on life cycle theory, and then to put forward benefit evaluation and modeling of carbon waste reduction in e-waste recycling.

Fields of application:Carbon footprint analysis in e-waste recycling process, contribution accounting of carbon emission reduction of electronic waste recycling enterprises, and environmental performance evaluation of electronic waste management policy.



Benefit Assessment Framework of Carbon Emission Reduction

(Waste Air Conditioner)


Project 14: The Life Cycle Information Database and Decision Support System of Electronic Waste

Introduction:This is to build a life cycle information database covering the whole process of electronic waste collection, transportation, dismantling, recycling and terminal disposal based on the industry-university collaboration mode, which includes two kinds of core data, key components of typical electronic waste and life cycle inventory.On this basis, the data collection system and decision support tools are developed to realize the contribution, sharing and depth exploration of effective information of relevant parties.One applied software copyright is the electronic waste life cycle information database system whosePatent Application No.is 2016SR188431.

Fields of application:To Support environmental authorities to carry out comprehensive management of the whole process of electronic waste; to provide a self-help solution for the analysis of the value of electronic waste recycling and environmental benefits; applied to ecological design and process optimization for electrical and electronic equipment enterprises, and to provide a method and data support for the comparison and optimization of the technical scheme for the recycling of electronic waste enterprises.



Information Database of E-waste Lifecycle



2)Equipment Development

Equipment I: A Production Line for Recycling Waste Toner Cartridge





Introduction:The production line is to recycle the toner cartridge that is a key component of printers or copiers, which mainly combines technologies such as selective mechanical crushing, magnetic separation, high pressure air-cleaning, eddy current separation and oscillating screening, so as to recycle the valuable materials containing plastic, aluminum, iron and magnet.

The process system has apparent advantages, for instance, low energy consumption, low noise, cleaned product and no secondary pollution. Its processing capacity reaches 4 tons per day and the total power of the system is up to 45Kw.

Patent:

A toothed roller crusher used to treat the waste toner cartridges.Patent Application No.: CN203620683 U.

Field of application:Recycling of toner cartridges and materials of waste printers or duplicators.

 

Equipment IIEquipment for treatment of scrap Hg-containing lamps

Diagram:





Introduction:This system adopts the way of mechanical crushing and separation method with full sealed type. Its high compatible processing performance allows it to handle the efficient separation and recovery of glass, metal, plastic, fluorescent powder and mercury from a variety of compact fluorescent lamp, high-pressure Hg-containing lamps and other waste Hg-containing lamps simultaneously, realizing recycling and harmless treatment. Its processing capacity is up to 500kg/h, the power of its crushing and separation system reaches 60KW, and the power and time of its distillation system are 70KW and 6 hours respectively.

Patents:

l A recycling and processing system and technology for waste Hg-containing lamps.Patent Application No.: CN105070621A;

l A distillation recovery device for waste Hg-containing materials.Patent Application No.: CN204563643U

l A method to strengthen the leaching of rare earth metals from waste phosphors by mechanical activation.Patent Application No.: CN104593608A

Fields of application:Recycling of valuable materials from waste fluorescent lamps, high-pressure Hg-containing lamps and other waste Hg-containing lamps, and environment-friendly treatment of metal mercury.

 

Equipment III:Automatic Equipment for Dismantling Waste LCD Displays


 




Introduction:The equipment can automatically dismantle waste LCD displays, and recover its components including plastic rear cover, border frame, shielding cover, circuit board and liquid crystal screen. Compared with artificial disassembly, the automatic disassembly line ensures high efficiency and quality, and significantly reduces the harm to the environment and the human body during the operation.

Patents:

l An automatic cutting device for circuit board connected to a waste LCD.Patent Application No.: CN204867214U

l An automatic disassembly method of screws and its device based on visual positioning and torque control.Patent Application No.: CN104924064A

l A trepanning device for display cover.Patent Application No.: CN204832917U

l A dismantling and classification system for waste LCD.Patent Application No.: CN204817438U

l A dismantling process for waste LCD displays.Patent Application No.: CN104923551A

Fields of Application:Dismantling and material recovery of all kinds of LCD displays of waste microcomputers.

 

Equipment IV: Recycling Metals from Waste Printed Circuit Boards through Microbial Method

Diagram:


Introduction:Microbial leaching and extraction - electrolysis metal recovery technology is used in this process. The recycling of metals from waste printed circuit boards is fully realized and the traditional method of high energy consumption and secondary pollution is avoided. The leaching rate of metal like copper from electronic waste is over 95% and the metal purity is over 99%. This is identified as a domestic leading technology by Department of Science and Technology of Guangdong Province and the experts from China Environmental Protection Industry Association.

Patents:

l A device for recovering the elemental copper on the surface of gantry and its recovery method.Patent No.: ZL 201410467450.1.

l A method and equipment for the recovery of metal components on a discarded flexible PCB (FPC).Patent No.: ZL 201410542352.X.

l A method of using carbon cloth electrode modified by nitrogen doped carbon nanotubes to improve the efficiency of microbial leaching of copper from printed circuit boards.Patent Application No.: 201510912102.5

l A method of using carbon pod electrode modified to improve the efficiency of microbial leaching of copper from printed circuit boards.Patent Application No.: 201510912037.6

l A method of using a carbon cloth electrode system modified by graphene to improve the method of microbial leaching of copper from waste printed circuit boards.Patent Application No.: 201610229331.1

l A method of using a carbon pod electrode system modified by graphene to improve the microbial leaching of copper from waste circuit boards.Patent Application No.: 201610222686.8

l A process to improve the efficiency of microbial leaching of copper from waste printed circuit boards by Nitrogen doped carbon nanotubes.Patent Application No.: CN104630488A

Fields of Application:Metal recovery from all kinds of waste circuit boards.

 

Equipment V: Equipment for Recycling the Nonmetallic Materials in Waste Printed Circuit Board by Green Chemical Methods

Diagram


Introduction: This technology is to separate and recover the epoxy resin and glass fiber from the nonmetallic materials in waste printed circuit boards through green chemical methods. The separation effect is promising. The recovery conditions are mild and the process is easy to operate. And the chemical reagents are recyclable and without secondary pollution.

 

Patents:

l The method of recovering epoxy resin and glass fiber from nonmetallic powder in printed circuit boards.Patent Application No.: CN101407596A

l A chemical treatment of the nonmetallic powder or the toughened polypropylene composite in waste printed circuit boards and its preparation method.Patent Application No.: CN105504516A

l An organic acid treatment of the nonmetallic powder or the polyethylene terephthalate(PET) composite; material in waste printed circuit board and its preparation method.Patent Application No.: CN105524434A.

l A chemical treatment of the nonmetallic powder or the polypropylene composite in waste printed circuit boards and its preparation method.Patent Application No.: CN104610651A.

 

Fields of application:All waste epoxy resin, including recycling nonmetal materials from waste and scrap printed circuit board, all kinds of thermosetting epoxy resin products such as epoxy resin, tubular waste electronic packaging waste.