Handbook of extractive metallurgy: Precious Metals, by Fathi Habashi

By Fathi Habashi

Extract all of the metals details you would like! A wealth of knowledge on metals and their extraction is published during this accomplished guide. the purpose of this publication is to supply a transparent description of the way a specific steel is extracted industrially from diversified uncooked fabrics, and on what its vital compounds are. the current paintings is a set of fifty eight articles written through over 280 experts. It provides hundreds of thousands of most desirable illustrations, diagrams and charts, and offers hand-picked references making sure the main updated assurance. a special characteristic of this reference paintings is its constitution. The approach used here's in response to an fiscal type, which displays mostly the makes use of, incidence and monetary price of metals. First, the ferrous metals, i.e., these utilized in the creation of iron and metal, are defined. Then, nonferrous metals are subdivided into basic, secondary, gentle, important, refractory, scattered, radioactive, infrequent earth, ferroalloy metals, and, eventually, the alkali and the alkaline earth metals are defined. The guide is a necessary reduction for the training metallurgist. Mining engineers, mineralogists, chemical engineers, chemists and geologists will locate it a accomplished table reference. it truly is of curiosity to engineers and scientists in looking an exhaustive sourcebook, and it's going to be found in each library.

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Extra resources for Handbook of extractive metallurgy: Precious Metals, Refractory Metals, Scattered Metals, Radioactive Metals, Rare Earth Metals, Volume 3

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99% is increasingly being specified for industrial applications. The first and most important task is the recovery of gold and platinum metals from crude silver. The value of the gold in dore silver and auriferous silver often exceeds that of the silver itself. The refining of silver therefore generally includes a gold-silver separation process. Before refining, the noble metals are in very concentrated form, so the process must involve the shortest possible tying-up of the noble metal. 1 Fine Smelting If the crude silver contains hardly any gold or platinum-group metals, silver of fineness 999/1 000 can be obtained by an oxidation process, generally carried out in a separate refilling furnace.

The anodes and cathodes are arranged horizontally. Each cell is provided with only one Handbook ofExtractiveMetallllrgy Silver anode and one cathode. The cathode is a stainless steel plate covering the entire floor area. Above this, at a distance of 10 cm, is a slightly smaller framework of nonconducting material, covered with fabric and containing the anodes. The anode and cathode are supplied with electric current via silver contacts. The crude silver anodes are completely covered by electrolyte, and therefore- completely dissolved, unlike the anodes of the Mobius process, which leave behind some unconsumed metal.

Ag-a-Al 2 0 3 , Ag-W, Ag-Ta), silver can be dissolved by nitric acid without attacking the accompanying material. More reactive metals such as aluminum, nickel, tin, cadmium, or indium can generally be dissolved even if they are alloyed with silver by using acid, acid mix1Ures, or alkali, or by anodic dissolution, leaving silver as the residue. Before dental amalgam wastes are treated chemically to recover silver, they are usually heated to > 500 DC in closed equipment with strict control of the surrounding atmosphere to distill the mercury.

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