Gold cobalt containing

Solsona, B., Garcia, T., Hutchings, G., et al (2009). TAP Reactor Study of the Deep Oxidation of Propane Using Cobalt Oxide and Gold-containing Cobalt Oxide Catalysts, Appl Catal. A Gen., 365, pp. 222-230. 

Arsenic is widely distributed about the earth and has a terrestrial abundance of approximately 5 g/t (4). Over 150 arsenic-bearing minerals are known (1). Table 2 fists the most common minerals. The most important commercial source of arsenic, however, is as a by-product from the treatment of copper, lead, cobalt, and gold ores. The quantity of arsenic usually associated with lead and copper ores may range from a trace to 2 —3%, whereas the gold ores found in Sweden contain 7—11% arsenic. Small quantities of elemental arsenic have been found in a number of localities. 

Gold, platinum, palladium, and silver are the principal components of most of the solders used for joining both noble and base metal alloys. Some solders for base metal alloys also contain nickel, chromium, and/or cobalt as primary ingredients. 

Silver-containing catalysts are used exclusively in all commercial ethylene oxide units, although the catalyst composition may vary considerably (129). Nonsdver-based catalysts such as platinum, palladium, chromium, nickel, cobalt, copper ketenide, gold, thorium, and antimony have been investigated, but are only of academic interest (98,130—135). Catalysts using any of the above metals either have very poor selectivities for ethylene oxide production at the conversion levels required for commercial operation, or combust ethylene completely at useful operating temperatures. 

Fig. 13.2 Linear plats of the effect of current density an the porasity, expressed as p.p.m. Cu, for three different gald-plating baths. The numbers next ta each point show the actual average thickness Orm) for each test. Bath A was a proprietary alkaline cyanide bath using silver as a brightener. Bath D was an acid gold bath containing cobalt and an ethylenediamine tetraacetic...

Manufacture of cell phones and personal computers consumes 3% of gold and silver mined worldwide each year, and 13% of palladium and 15% of cobalt as well. Electronics contain approximately 60 elements, some valuable and hazardous, or both [13], Recycling the valuable elements is the driving force behind the intensive activities engaged in disposal of e-waste. 

In (1) the electrolytic process, a nickel of 99.9% purity is produced, along with slimes which may contain gold, silver, platinum, palladium, rhodium, iridium, ruthenium, and cobalt, which are subject to further refining and recovery. In (2) the Mond process, the nickel oxide is combined with carbon monoxide to form nickel carbonyl gas, Ni(CO)4. The impurities, including cobalt, are left as a solid residue. Upon fuitlier heating of the gas to about 180°C, the nickel carbonyl is decomposed, the freed nickel condensing on nickel shot and the carbon monoxide recycled. The Mond process also makes a nickel of 99.9% purity. 

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