• Autoclave and Pressure Oxidation . Mining and Minerals . Industries .

    Pressure oxidation was developed for processing refractory ores where gold is . all while insuring optimum process results such as achieving maximum oxygen.

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  • Patent EP1708875A1 Improved process for production of gypsum .

    Oct 11, 2006 . An improved process calcining a gypsum/cellulosic fiber slurry to produce a . The temperature in the autoclave is raised to about 140° C. to convert the . The acicular calcium sulfate alpha hemihydrate crystals formed by heating a . The source of the gypsum may be from raw ore or from the by product of.

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  • New Technologies for HCl Regeneration in Chloride .

    Chloride based aqueous leaching processes find increas ingly new applications in the area of metal recovery from primary (ores or concentrates) or secondary.

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  • Download as a PDF CiteSeerX

    May 17, 2006 . recovery of nickel, cobalt (and manganese) from nickel laterite ores was proposed by Chesbar ... process, at 150 220°C in an autoclave. .. S. Girgin and G.P. Demopoulos, Production of the High Value Material, Alpha CaSO4. Hemihydrate out of Spent CaCl2 Solutions by Reaction with H2SO4, In EPD.

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  • Leaching (metallurgy) Wikipedia

    Leaching is a process where ore is soluble and impurities are insoluble,widely used extractive . A good example of the autoclave leach process can also be found in the metallurgy of zinc. It is best described by the following chemical reaction:.

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  • C04B United States Patent and Trademark Office

    Iron ore cements; {Iron rich cements, e.g. Ferrari cements, Kühl cements} [2013 01] . {by extracting part of the material from the process flow and returning it into the ... {Autoclaves, e.g. using chariots} [2013 01] . conditions, {i.e. to obtain alpha hemihydrate (C04B 11/0281 C04B 11/0288 take precedence)} [2016 05].

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  • Method of producing calcium sulfate alpha hemihydrate National .

    Nov 25, 2003 . 5562892, Process for the production of alpha hemihydrate calcium sulfate . Zurz et al., Autoclave Free Formation of a Hemihydrate Gypsum,.

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  • Process for the conversion of calcium sulfate dihydrate into alpha .

    Jan 3, 1992 . alpha hemihydrate. a salt solution is used as a medium. The salt solution .. suited for use in underground mining, since the ef?ores cence caused by the . Compared with autoclave processes, the process ac cording to the.

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  • Gold extraction Wikipedia

    Gold extraction or recovery from its ores may require a combination of comminution, mineral .. The refractory ore treatment processes may be preceded by concentration (usually sulfide flotation). . Pressure oxidation is an aqueous process for sulfur removal carried out in a continuous autoclave, operating at high pressures.

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  • Production of calcium sulphate alpha hemihydrate from citrogypsum

    an autoclave to temperature over 100 °C (autoclave method). . production of alphahemihydrate by this method were . many processes giving waste gypsum.

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