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E-Waste Management
E-waste management in India is increasingly crucial due to the rapid growth of electronics and the hazardous nature of e-waste, which contains toxic elements and valuable metals. E-Parisaara Pvt. Ltd. is the first government-authorized eco-friendly recycling unit in India, using innovative technologies to recover materials and reduce pollution. The recycling process includes manual dismantling, chemical recovery methods, and significant opportunities for future innovations in precious metal recovery.
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E-Waste Management
- 1. E-Waste Management inIndia (E-Parisaara Pvt. Ltd)
- 2. Why worry aboutE-waste ?? E waste is a rapidly growing problem Phenomenal growth in field of electronics leading to more e-waste E-waste do not decompose Lack of technological advancement Highly toxic elements are present
- 3. Content ofWEEE It contains more than 1000 components Toxic substances : lead,mercury,arsenic,cadmium,selenium etc. Precious metals such as gold, silver Ordinary metal such as copper, zinc, aluminium
- 4. Fig: WEEE materialcomposition(ETCRWM)
- 5. E-Parisaara Firstgovt. authorized eco-friendly recycling unit First scientific e-waste recycling technologies used Aim to reduce pollution, landfills and to recover valuable metals, plastic and glass from E-waste Simple and low cost machines being used ex: shredder, crusher etc.
- 6. Process ofconverting waste to Raw material Manual Dismantling Hands on segregation Shredding Density separation
- 7. Other processesin E-Parisaara Toner cartridge dismantling Gold recovery from Printed Circuit board strips and components Silver recovery from silver coated components Shredding of printed circuit board Note: First three are pending for patent so no exact information of process used
- 9. Recycling ofE-Waste can be broadly divided into • Disassembly: selectively disassembly, targeting on singling out hazardous or valuable components for special treatment • Upgrading: using mechanical processing and/or metallurgical processing to up-grade desirable materials • Refining: recovered materials are retreated or purified by using chemical (metallurgical) processing so as to be acceptable for their original using.
- 10. Fig: Block diagramfor first step disassembly
- 11. Chemical processesin EEE recycling Pyro metallurgical recovery Hydro metallurgical recovery Bio metallurgical recovery
- 12. Pyro metallurgicalrecovery Includes smelting in blast furnace Drossing Sintering Melting Reaction in gas phase at high temperature
- 13. Existing technologies Norlandoprocess Boliden Ronnsker smelter Umicore’s precious metal recovery Dunn’s patent for Gold refining
- 14. Fig: Offgas emissioncontrol instalments in smelters
- 15. Limitation ofPyro Metallurgical process Cannot recover aluminium and iron HFR might lead to dioxins formation Large amount of ceramic and glass makes PM extraction difficult Only partial separation possible
- 16. Hydrometallurgical process Consists of series of acid or caustic leaches of solid material The leached solution is subjected to following methods 1. Precipitation of impurities 2. Solvent extraction 3. Adsorption 4. Ion exchange
- 17. Gold Adsorption onActivated carbon Ag complexes adsorption also done Leached Ag/Au gets adsorbed on activated carbon surface Mechanism and kinetics of adsorption La Brooy Model
- 18. Advantages ofHydro Metallurgical process More exact More predictable Easily controllable PM recovery efficiency is higher Disadvantages of Hydro Metallurgical process Choice of solution is difficult Solution required in large amount leading to extra expense
- 19. Future scopes Lack of technologies available in India for E-waste management Very promising field for innovations Lack of efficiency of formal sector role gives way to new start up's PM recovery is a open field for exploration in India as of now
- 20.
- 21. References • www.ewasteindia.com •Metallurgical recovery of metals from e-waste : Journal of hazardous material 158(2008)228-256 • E-waste management: A case study of Bangalore(Research journal of environmental and earth science) • Global perspective on e-waste( EIA review 25(2005)436-458) • E-waste management: An emerging environmental and health issue in India • Development of an integrated model to recover precious metal from electronic scrap(science direct)
Editor's Notes
- #2 E waste management 1) Introduction 2) data 3) types of E waste ,components 4) stats of sepcific component , amount 5) currently companies involved 6) E parisaraa 7) steps in E waste recycling 8) Technological aspects 9) process involved and pfd 10) specific chemical processes involved 11) some models used and calculation of chemical processes involved 12) limitation 13)future scope 14) conclusions Smelting is a form of extractive metallurgy; its main use is to produce a metal from its ore. This includes production of silver, iron, copper and other base metals from their ores. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gasses or slag and leaving just the metal behind Pyrolysis is a thermochemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). It involves the simultaneous change of chemical composition and physical phase, and is irreversible cracking is the process whereby complex organic molecules such as kerogens or heavy hydrocarbons are broken down into simpler molecules such as light hydrocarbons, by the breaking of carbon-carbon bonds in the precursors. The rate of cracking and the end products are strongly dependent on the temperature and presence of catalysts
- #7 Waste segregation means dividing waste into dry and wet. Dry waste includes wood and related products, metals and glass. Wet waste, typically refers to organic waste usually generated by eating establishments and are heavy in weight due to dampness. Waste can also be segregated on basis of biodegradable or non-biodegradable waste.
- #13 Dross is a mass of solid impurities floating on a molten metal or dispersed in the metal, such as in wrought iron
- #16 Halogenated flame retardent
- #17 Solvent extraction, also known as Liquid–liquid extraction or partitioning, is a method to separate a compoundbased on the solubility of its parts Ion exchange is an exchange of ions between two electrolytes or between an electrolyte solution and a complex. In most cases the term is used to denote the processes of purification, separation, and decontamination of aqueous and other ion-containing solutions with solidpolymeric or mineralic 'ion exchangers'.