2 - mineral processing, comminution_bj - introduction

2 - mineral processing, comminution_bj - introduction -...

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GEOL3600: Earth & Mineral Resources Mineral Processing Mineral Processing Introduction
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GEOL3600: Earth & Mineral Resources Overview 2 Feb 15, 2017 Ore Ore directly out of the ground = run of mine - ROM ore; refers to ore in its natural, unprocessed state after blasting Metals hosted in ore minerals bound to a variety of other elements; must be physically and chemically separated (processed) from the other material in the ore to produce the valuable product
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GEOL3600: Earth & Mineral Resources Overview 3 Feb 15, 2017 Facilities flotation plant (Bagdad Copper Mine, Arizona)
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GEOL3600: Earth & Mineral Resources Overview 4 Feb 15, 2017 Ore Processing Purpose of ore processing to separate the valuable material in ore from the non-economic. Generally, a two stage process – 1) separate ore minerals from the gangue - a two-stage physical process 2) breakdown ore minerals to release the metals (e.g. Au, Ag, Pt,) from the other constituent elements - chemical process
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GEOL3600: Earth & Mineral Resources Overview 5 Feb 15, 2017 Physical Processes - Comminution comminution - process of reducing particle size in the ROM ore , accomplished by breaking, crushing and grinding two-fold purpose: 1) produce fragments composed of a single mineral (i.e. monomineralic) 2) increase surface area of ore minerals - promote chemical processes in extractive metallurgy
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GEOL3600: Earth & Mineral Resources Overview 6 Feb 15, 2017 Physical Processes - Beneficiation beneficiation (or benefication) – process that improves/benefits economic values of an ore separation of ore from gangue minerals using differences in the physical properties; done after original ore is milled to a size where individual particles are monomineralogic; produces higher grade product (concentrate) and waste stream (tailings) to lower transportation costs
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GEOL3600: Earth & Mineral Resources Overview 7 Feb 15, 2017 Chemical Processes – Extractive Mineralogy extractive metallurgy - liberation of metal atoms (economic) from other elements (non- economic) pyrometallurgy : breakdown of ore minerals using heat to release metals and/or convert ore minerals to another form hydrometallurgy : use of aqueous solutions to liberate metal atoms from ore mineral
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GEOL3600: Earth & Mineral Resources Overview 8 Feb 15, 2017 Extractive Mineralogy - Pyrometallurgy pyrometallurgy uses heat to either completely breakdown ore minerals, or convert them to other, more easily processed minerals. Historically, it is the primary mechanism for treating metallic ores three primary pyrometallurgical mechanisms: roasting : converts the ore minerals to other compounds by heating temperature reached below the melting temperatures used primarily with sulfide ores smelting : heats ore minerals to high enough T for melting, to produce metallic liquids metals separated using chemical processes or density differences.
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