Hydrometallurgy

INTRODUCTION Chromium is used in many industrial processes. For example, chromium is used in some(a) coats to make them harder and to a greater extent disgustful to corrosion and oxidation. Chromium is whizz of 4 elements found in Chromite. Chromite is one of the major ores that make up the publics mantle. Chromite is iron magnesium chromium oxide. In some out of date cases, magnesium is embossmentd for iron. Also aluminum and ferric ions can substitute chromium in a reaction. Hydrometallurgy is a form of extractive metallurgy that utilizes sedimentary resultant chemistry for the recovery of metals from salts, minerals, or ores. Extraction is a process in which metal is aloof from an ore by profligacy the metal in a solvent, so recovering the metal from the solution (This is done by dissipation the metal into an acerb or water). To isolate certain metals you bespeak to take into note that some be amphoteric. Amphoterism is the reactiv ity of a substance with two acids and strands, acting as an acid in the figurehead of a base and as a base in the presence of an acid. A few amphoteric metals be beryllium, tin, lead, aluminum, and surface. When aqueous zinc nitrate is reacted with a limited hail of potassium hydroxide, insoluble zinc hydroxide forms. 2 [pic] + [pic] [pic] Zn[pic] [Eq.

1] surface hydroxide behaves as a base when it reacts with acids to form salts and water. In a solution containing excess [pic] ions, Zn[pic] acts like an acid and dissolves forming the interlacing ion[pic]. ! 2 [pic] + Zn[pic] [Zn[pic]][pic] [Eq. 2] Reduction-oxidation, more commonly known as redox, reactions occur when one or more electrons are transferred betwixt reactant species. In these reactions the reactants that are oxidized lose electrons and the other reactants that make water electrons are reduced. In these reactions one of the reactants is oxidized thus the...If you essential to get a full essay, order it on our website: BestEssayCheap.com

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