Recovery of Precious Metals in Gold Jewelry Manufacturing
With the current in prices of precious metals it is wise to review your recovery procedures to optimize the recovery of precious metals in your manufacturing operations. The following are the usual sources of wastes in jewelry manufacturing.
Melting & Casting
Sources – Crucibles, casting dies, molds, slag, flux residues, casting machinery clean up, sweeps from floors.
Fabrication, Rolling, Wire Drawing, Stamping
Sources – Chips around rolling mills and Wire drawing equipment, Particles around stamping and chain making equipment, Lubricating oils, Rags and wipes, sweeps from floors.
Assembly, Finishing & Cleaning
Sources – Filing, Grinding, Sawing, Soldering, Polishing, Cleaning, Rags and Wipes, Wheels & brushes, Sweeps from floors.
Sources – Smocks and Aprons, Hand washing, Benches, Floors, Walls, Dust on machinery, fans and lights, Sink traps and Rugs.
|Approximate gold contents of scrap and wastes in gold jewelry manufacturing|
|Type of Material||Approximate Gold Content|
|Scrap Jewelry||39 to 75%|
|Bench Scrap||19 to 52%|
|Sink Trap Sludge||5 to 8%|
|Carpets & Wood Floors||0.1 to 9%|
|Polishing Dust & Sweeps||0.5 to 5%|
|Crucibles||0.6 to 5%|
|Floor Sweeps, Emery Paper and Brushes||0.1 to 4%|
United PMR will provide free plastic buckets, fiber or steel drums for shipping your waste materials and offers a pick up service in many areas. Please check with your United representative for more information.