METALLURGY, · Electrolytic refining means refining by electrolysis. Many metals like Cu, Zn, Ni, Ag and Au are refined by this process. For refining an impure metal by electrolysis : A thick block of impure metal is made anode. A thin strip of the pure metal is made cathode.A to Z Index of Hazardous Waste Topics | US EPA, · Secondary lead processing Scrap metal Sham recycling Small quantity generator (SQG) Small quantity handler of universal waste Sole active ingredient Solid waste Solvents Solvent-contaminated wipes Special wastes Spent Lead-Acid Batteries (SLABs)Hazardous Waste Recycling | Hazardous Waste | US EPA, · EPA developed the hazardous waste recycling regulations to promote the reuse and reclamation of useful materials in a manner that is safe and protective of human health and the environment. A hazardous waste is recycled if it is used, reused, or reclaimed. OnLead smelting, · Lead scrap includes lead-acid batteries, cable coverings, pipes, sheets and lead coated, or terne bearing, metals. Solder, product waste and dross may also be recovered for its small lead content. Most secondary lead is used in batteries. To recover lead from aRefining of edible oils, · Others refining techniques such as enzymatic refining, membrane refining, and nanorefining are being developed keenly, but costs are a limitation in those techniques. Unsaturated fatty acids, tocopherols, phytosterols, and other antioxidant components in the oil are the major concerns in the oil refining process to preserve the nutritional quality of the oil..