Precious metal recovery

Nathaniel Arbiter and Kenneth N. Han, eds., Gold- Advances in Precious Metals Recovery, Mineral Processing and Extractive Metallurgy Review, vol. 6,1990. 

Certain units engaged in precious metals recovery. 

In addition to these exemptions, there are three types of units that are conditionally exempt from the regulations. These are metal recovery furnaces, precious metal recovery units, and certain other special industrial units. In order to claim these exemptions, owners/operators must provide a onetime written notice claiming the exemption, conduct sampling, and analysis, and maintain records to demonstrate compliance with all applicable requirements. Any waste management prior to burning in this type of unit, and any resulting residues, are subject to applicable hazardous waste regulation. 

Precious Metals Recovery Metal recovery units engaged in precious metals recovery are also conditionally exempt from Part 266, Subpart H. Precious metal recovery is defined as the reclamation of economically significant amounts of gold, silver, platinum, palladium, iridium, osmium, rhodium, ruthenium, or any combination of these metals. Provided the owner/operator complies with the alternative requirements, the unit would be exempt from all BIF requirements except for the regulations concerning the management of residues. 

Fleming, C. A. (1992). Hydrometallurgy of precious metals recovery. Hydrometallurgy, Theory and Practice Proceedings of the Ernest Peters International Symposium. PartB, 30(1-3), 127-162. doi 10.1016/0304-386X(92)90081-A... 

Rosso. J.R "Maximize Precious-Metal Recovery from Spent Catalysis." Cheat. Eng. Progress. 66 (December 1992),... 

Miscellaneous bromine uses are in catalysts, fluxes, precious metal recovery, hair care products, food additives, flotation agents in ore treatment, solvents, refrigerants, quartz-halide light bulbs, some lasers, some photovoltaic batteries, and some electrically conductive polymers. 

C. Wright and R. L. Bruening, in Precious Metals Recovery and Refining (ed L. Manziek) Historical Publications, Austin, 1990, pp. 95-106. 

The price of adsorbents and catalysts varies very widely depending on the nature of the material. The cheapest catalysts and adsorbents cost less than l/lb, while more expensive catalysts containing noble metals such as platinum and palladium have costs that are mainly determined by the amount of precious metal on the catalyst. In some cases, the value of the noble metal on a load of catalyst is so high that the chemical plant rents the catalyst rather than buying it, and when the catalyst is spent, it is returned to the manufacturer for precious metal recovery. 

P. Grumett, Precious Metal Recovery from Spent Catalysts, Platinum Metals Rev., 47(4), 163-166 (2003). 

Potentially treatable effluent streams are in either gaseous or liquid form. Application to date has been almost exclusively to liquid streams, mainly because of the history of precious metal recovery for profit. 

Metal manufacturing, refining and finishing works precious metal recovery works (ISBN 1 85112279 6). 

Hagelugken C (2001b) Securing the supply for tomorrow precious metals recovery from automotive catalysts. METALL 55 104—111. 

Degussa AG, Precious Metal Cycle and Precious Metal Recovery. 

K.R. Barrett and R.P. Knight, Lead Bullion Refining and Precious Metal Recovery , Extraction Metallurgy 85. IMM, London, England, 1985, 683-708. 

R.P. Knight and R.J. Reader, The Refining of Lead Bullion and Precious Metals Recovery at Britannia Refined Metals Ltd. , Lead into the Future. IMM, London, England, 1996,53-73. 

Hydroxyapatite (CajQ(P04)g(0H)2) has also attracted considerable interest as a catalyst support. In these materials, wherein Ca sites are surrounded by P04 tetrahedra, the introduction of transition metal cations such as Pd into the apatite framework can generate stable monomeric phosphate complexes that are efficient for aerobic selox catalysis [99]. Carbon-derived supports have also been utihzed for this chemistry, and are particularly interesting because of the ease of precious metal recovery from spent catalysts simply by combustion of the support. Carbon nanotubes (CNTs) have received considerable attention in this latter regard because of their superior gas adsorption capacity. Palladium nanoparticles anchored on multiwalled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) show better selectivity and activity for aerobic selox of benzyl and cinnamyl alcohols [100, 101] compared to activated carbon. Interestingly, Pd supported on MWCNTs showed higher selectivity toward benzaldehyde, whereas activated carbon was found to be a better support in cinnamyl alcohol oxidation. Functionalized polyethylene glycol (PEG) has also been employed successfully as a water-soluble, low-cost, recoverable, non-toxic, and non-volatile support with which to anchor nanoparticulate Pd for selox catalysis of benzyl/cinnamyl alcohols and 2-octanol [102-104]. 

The conception of the three-dimensicMial electrode occurred almost simultaneously in France and England around 1966 as a necessity for precious metal recovery from dilute solutions occurring in industrial processes and for the removal of heavy metals from wastewaters. In this class of electrodes, the reaction stiU occurs at the liquid-solid interface, but the surface area is provided by the electrode volume. Porous or three-dimensional electrodes have been... 

US Bureau of Mines (1986) Precious Metals Recovery from Low-Grade Resources, National Western Mining Conference, Denver, c oiorado, Information Circular No, 9059, US Bureau of Mines, Pittsburgh,... 

Precious metal recovery - oxide, nitrate soils... 

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