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the Wohlwill process

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  • Wohlwill process — The Wohlwill process is an industrial scale chemical procedure used to refine gold to a high degree of purity (99.999%). The process was invented in 1874 by Emil Wohlwill. This electrochemical process involves casting a dore ingot of 95%+ gold to …   Wikipedia

  • Miller process — The Miller process is an industrial scale chemical procedure used to refine gold to a high degree of purity (99.95%). It was invented by Francis Bowyer Miller. This chemical process involves blowing a stream of pure chlorine gas over and through… …   Wikipedia

  • Emil Wohlwill — Hans Emil Wohlwill (November 24, 1835, Seesen February 2, 1912, Hamburg) was a German engineer of electrical chemistry. He invented the Wohlwill process in 1874. Literary works * Galilei und sein Kampf für die copernikanische Lehre , the 1st… …   Wikipedia

  • gold processing — Introduction  preparation of the ore for use in various products.       For thousands of years the word gold has connoted something of beauty or value. These images are derived from two properties of gold, its colour and its chemical stability.… …   Universalium

  • Gold — This article is about the metal. For the color, see Gold (color). For other uses, see Gold (disambiguation). platinum ← gold → mercury …   Wikipedia

  • silver processing — Introduction       preparation of the ore for use in various products.       Silver has long been valued for its white metallic lustre, its ability to be readily worked, and its resistance to the corrosive effects of moisture and oxygen. The… …   Universalium

  • Aqua regia — Freshly prepared aqua regia is colorless, but it turns orange within seconds. Here, fresh aqua regia has been added to these NMR tubes to remove all traces of organic material …   Wikipedia

  • Chloroauric acid — Other names …   Wikipedia

  • History of Physics —     History of Physics     † Catholic Encyclopedia ► History of Physics     The subject will be treated under the following heads: I. A Glance at Ancient Physics; II. Science and Early Christian Scholars; III. A Glance at Arabian Physics; IV.… …   Catholic encyclopedia

  • Тетрахлороаурат(III) водорода — Общие Т …   Википедия

  • Leanne Rivlin — was an originator of the Environmental Psychology Doctoral Program at the CUNY Graduate Center in the late 1960s.BiographyEducation*Ph.D., M.A. Teachers College, Columbia University (1953,1957) *B.A. Brooklyn College, Psychology English… …   Wikipedia

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