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The leaching behavior of nickel and iron in limonite-type laterite nickel ore was studied through ammonium hydrogen sulfate atmospheric leaching. The leaching temperature, ammonium bisulfate concentration, reaction time, and acid excess rate during the nickel dissolution process were optimized using the response surface methodology …
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The industry structure, operations, and business transactions involved in the refining of gold- and silver-bearing doré are described. The pyro- and hydrometallurgical processing approaches to refining doré materials are illustrated and compared with those for non-doré materials.
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It was found that impurity metals iron and copper originating from the gold ore (Fe 1.6% and Cu 0.05%), were advantageous self-initiating oxidants and 87% of gold could be dissolved in pure calcium chloride (2.8 M) solution. ... Solution analysis indicates that the dissolution kinetics were fastest at a temperature of 98 °C (dissolution ...
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When solid materials are exposed to a liquid, some constituents will dissolve to a greater or lesser extent. The degree of dissolution of individual constituents by the contacting liquid leads to a leachate/percolate or extract composition that can be of interest for different purposes [], such as the extraction of metals from solid waste through a …
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This flowsheet would also be suitable for a larger tonnage by proper sizing of the various units of equipment. The flowsheet contemplates a six to seven day leach-wash cycle with one tank being discharged and charged each day. ... Dissolution of the ore may be either on a batch basis (a given charge of ore is agitated with required amount of ...
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Methods and systems for dissolving an iron-containing ore are disclosed. For example, a method of processing and dissolving an iron-containing ore comprises: thermally reducing one or more non-magnetite iron oxide materials in the iron-containing ore to form magnetite in the presence of a reductant, thereby forming thermally-reduced ore; and dissolving at …
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The recovery of gold by ore leaching is influenced by the size of the particles and the chemical environment. The effect of particle size on the dissolution of gold is usually studied using mono-size particles as the gold in solution comes from the ore of a unique leached particle size. This paper proposes a method to estimate the gold …
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Dissolution and characterization studies on the purification of muscovite ore in hydrochloric acid for use in paint production was investigated. Specific dissolution parameters including the effects of acid concentration as well as temperature on the
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It is obvious that both hydrochloric acid and sodium chloride have affected the gold dissolution in hypochlorite solution. Leaching pure gold with an acidic sodium hypochlorite solution has been demonstrated to be effective. The initial rate of gold dissolution was extremely rapid.
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Since the dissolution rate of precious metals mainly depends on the concentration of dissolved oxygen in the pulp the kinetics of the gold extraction become slow in such cases, which in turn often leads to a significant decrease in the overall gold output within the conventional leaching time of up to 48 hours.
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The first commercial production of phosphate rock began in England in 1847. A wide variety of techniques and equipment is used to mine and process phosphate rocks in order to beneficiate low-grade ores and remove impurities. The eighth chapter of this book deals with mining and beneficiation of phosphate ore. The principle and …
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Case studies highlight the importance of bufer preparation, potential impact of contamination of the dissolution medium, additive-induced degradation, risks in the use of automation, diferences between dissolution systems, and the efect of filter selection.
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