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  2. Wohlwill process - Wikipedia

    en.wikipedia.org/wiki/Wohlwill_process

    The resulting gold is 99.999% pure, and of higher purity than gold produced by the other common refining method, the Miller process, which produces gold of 99.5% purity. [1] [2] [3] For industrial gold production the Wohlwill process is necessary for highest purity gold applications. When lower purity gold is required, refiners often utilize ...

  3. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    Alternative methods exist for parting gold. Silver can be dissolved selectively by boiling the mixture with 30% nitric acid, a process sometimes called inquartation. Affination is a largely obsolete process of removing silver from gold using concentrated sulfuric acid. [8] Electrolysis using the Wohlwill process is yet another approach.

  4. Miller process - Wikipedia

    en.wikipedia.org/wiki/Miller_process

    The resulting gold is 99.5% pure, but of lower purity than gold produced by the other common refining method, the Wohlwill process, which produces gold of up to 99.999% purity. [1] [2] The Wohlwill process is commonly used for producing high-purity gold, such as in electronics work, where exacting standards of purity are required.

  5. Gold parting - Wikipedia

    en.wikipedia.org/wiki/Gold_parting

    The Miller process affords gold up to 99.5% purity. The process involves blowing a stream of chlorine through molten gold. Impurities in the gold form chlorides, which form a slag that floats on the molten gold. [2] [3] Invented by Emil Wohlwill in 1874, the Wohlwill process produces the highest purity gold (99.999%). It is an electrolytic ...

  6. Petroleum refining processes - Wikipedia

    en.wikipedia.org/wiki/Petroleum_refining_processes

    Petroleum refining processes are the chemical engineering processes and other facilities used in petroleum refineries (also referred to as oil refineries) to transform crude oil into useful products such as liquefied petroleum gas (LPG), gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils. [1] [2] [3]

  7. Bitter cold in forecast: December set for 'coldest start' in ...

    www.aol.com/bitter-cold-forecast-december-set...

    Hurricane season: Deadly season ends with at least 335 US deaths Wind chill advisories in Northern US. Thanks to that Arctic outbreak of cold air blasting from the northern Plains into the Midwest ...

  8. Emil Wohlwill - Wikipedia

    en.wikipedia.org/wiki/Emil_Wohlwill

    Wolf Emil Wohlwill (24 November 1835 in Seesen – 2 February 1912 in Hamburg) was a German-Jewish engineer of electrochemistry. He invented the Wohlwill process in 1874. Literary works

  9. HuffPost Data

    projects.huffingtonpost.com

    Poison Profits. A HuffPost / WNYC investigation into lead contamination in New York City

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