Extractive metallurgy is the practice of extracting metal from ore, purifying it, and recycling it. Metallurgy is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements and their mixtures, which are called alloys. ... Metal - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... An ore is a mineral deposit containing a metal or other valuable resource in economically viable concentrations. ...

Most metals found in the Earth's crust exist as oxide and sulfide minerals. These compounds must be reduced to liberate the desired metal. There are two methods of reduction: electrolytic and chemical. Metal - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... Earth, also known as the Earth, Terra, and (mostly in the 19th century) Tellus, is the third planet outward from the Sun. ... Crust (geology) - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... An oxide is a chemical compound of oxygen with other chemical elements. ... In chemistry, a sulfide (sulphide in British and Canadian English) is a chemical compound or combination of sulfur with an oxidation number of -2, with another chemical element or a radical thereof. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... Reduction or reducing has several meanings: In mathematics, reduction is the process of manipulating a series of equations or matrices into a desired simpler format. ... An electrolyte is a substance which dissociates free ions when dissolved (or molten), to produce an electrically conductive medium. ... A chemical substance is any material substance used in or obtained by a process in chemistry: A chemical compound is a substance consisting of two or more chemical elements that are chemically combined in fixed proportions. ...

Chemical reduction can be carried out in a variety of processes, including reductive smelting - the process of heating an ore with reducing agent (often, coke or charcoal) and purifying agents to separate the pure molten metal from the waste products. Some other processes for chemical reduction include autoclave hydrogen reduction and converting. The latter though does not produce the pure metal, therefore requiring further treatment of its product. Chemical reduction or smelting is a form of extractive metallurgy. ... A reducing agent is a substance used in electrochemistry that reduces another substance. ... Coke is a solid carbonaceous residue derived from low-ash, low-sulfur bituminous coal from which the volatile constituents (including water, coal-gas and coal-tar) are driven off by baking in an airless oven at temperatures as high as 1,000 degrees Celsius so that the fixed carbon and... Charcoal is the blackish residue consisting of impure carbon obtained by removing water and other volatile constituents of animal and vegetable substances. ... Categories: Move to Wiktionary | Stub | Chemistry ... Front loading autoclaves are common Cassette style autoclaves cycle very quickly Stovetop autoclaves need to be monitored carefully, but have a very large capacity Sterilization bags often have a “sterilization indicator mark” that typically darkens when sterilization temperatures have been reached. ... Metallurgical converter is a vessel used in the operation of converting. ...

Electrolytic reduction involves passing a large current through a molten metal oxide or an aqueous solution of the metal's salt. For example, aluminium is electrolysed from bauxite dissolved in molten cryolite. An electrolyte is a substance which dissociates free ions when dissolved (or molten), to produce an electrically conductive medium. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Atomic mass 26. ... Bauxite Bauxite is a naturally occurring, heterogeneous material composed primarily of one or more aluminium hydroxide minerals, plus various mixtures of silica, iron oxide, titania, aluminosilicate, and other impurities in minor or trace amounts. ... The cryolite mine at Ivgtut, Greenland, summer 1940 Cryolite (Na3AlF6, sodium hexafluoroaluminate. ...

Prior to reduction, it is often necassary to separate metal compounds to exclude co-reduction of different metals and contamination of the product. There is a great variety of separation processes: roasting, oxidative smelting, converting, leaching and many others. Leaching is the process of extracting a substance from a solid by dissolving it in a liquid. ...

Extractive metallurgical technologies are divided into mineral processing, hydrometallurgy and pyrometallurgy areas. Extractive metallurgical and mineral dressing operations are divided into:

• Ferrous metallurgy, which includes reduction of iron ore into iron, and further refinement and alloying with other metals to make steel.
• Non Ferrous metallurgy, which includes all other metals. This can be further broken down into:
  • Precious metals. The recovery of gold and silver and the platinum group metals.
  • Base metals. The recovery of lead, zinc, copper, and nickel.
  • Light metals. The recovery of magnesium, aluminium, tin, and titanium.
  • Minor elements. The recovery of arsenic, selenium, bismuth, tellurium, and antimony.
  • Industrial minerals. Major examples include clays, sands, silicates, and heavy mineral sands
  • Coal. The benficiation and treatment of coal.
  • Gems and precious minerals. The recovery of emeralds, diamonds, sapphires, rubies, and others.

General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... // Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. ... General Name, Symbol, Number gold, Au, 79 Chemical series transition metals Group, Period, Block 11, 6, d Appearance metallic yellow Atomic mass 196. ... General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ... The platinum group or platinum family is a group of six metal elements with similar physical and chemical properties. ... General Name, Symbol, Number lead, Pb, 82 Chemical series poor metals Group, Period, Block 14, 6, p Appearance bluish white Atomic mass 207. ... General Name, Symbol, Number zinc, Zn, 30 Chemical series transition metals Group, Period, Block 12, 4, d Appearance bluish pale gray Atomic mass 65. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance copper, metallic Atomic mass 63. ... General Name, Symbol, Number nickel, Ni, 28 Chemical series transition metals Group, Period, Block 10, 4, d Appearance lustrous, metallic Atomic mass 58. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Atomic mass 26. ... General Name, Symbol, Number tin, Sn, 50 Chemical series poor metals Group, Period, Block 14, 5, p Appearance silvery lustrous gray Atomic mass 118. ... General Name, Symbol, Number titanium, Ti, 22 Chemical series transition metals Group, Period, Block 4, 4, d Appearance silvery metallic Atomic mass 47. ... General Name, Symbol, Number arsenic, As, 33 Chemical series metalloids Group, Period, Block 15, 4, p Appearance metallic gray Atomic mass 74. ... General Name, Symbol, Number selenium, Se, 34 Chemical series nonmetals Group, Period, Block 16, 4, p Appearance gray, metallic luster Atomic mass 78. ... General Name, Symbol, Number Bismuth, Bi, 83 Chemical series Poor metals Group, Period, Block 15 (VA), 6, p Density, Hardness 9. ... General Name, Symbol, Number tellurium, Te, 52 Chemical series metalloids Group, Period, Block 16, 5, p Appearance silvery lustrous gray Atomic mass 127. ... General Name, Symbol, Number antimony, Sb, 51 Chemical series metalloids Group, Period, Block 15, 5, p Appearance silvery lustrous gray Atomic mass 121. ... Clay is a generic term for an aggregate of hydrous silicate particles less than 4 μm (micrometres) in diameter. ... Coal is a fossil fuel extracted from the ground either by underground mining, open-pit mining or strip mining. ... A gemstone is a mineral, rock (as in lapis lazuli) or petrified material that when cut or faceted and polished is collectible or can be used in jewellery. ... For other things of this name, see Emerald (disambiguation). ... A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... Asterism on the surface of a sapphire Sapphire is the single-crystal form of aluminium oxide (Al2O3), a mineral known as corundum. ... Ruby is a red gemstone, a variety of the mineral corundum in which the color is caused mainly by chromium. ...

Mineral processing

Mineral processing involves the use of physical processes to manipulate ore particle size, and concentrate valuable minerals using the processes of separation, based on such properties of the ore, as density, chemical composition, electrostatic, magnetic or fluorescence properties. A good example of a separation process is froth flotation. Mineral processing, otherwise known as mineral dressing, is the practice of beneficiating valuable minerals from their ores. ... Froth Flotation is a selective process for separating minerals from gangue by using surfactants and wetting agents. ...

Also of interest to the mineral processor is the separation of mineral solids from water and aqueous solutions by thickening, filtering and drying. In cooking, thickening is the process of increasing the viscosity of a liquid either by reduction, or by the addition of a thickening agent, typically containing starch. ... The term filter may refer to: Filter (chemistry) — a device to separate mixtures, e. ...

Pyrometallurgy

Pyrometallurgy involves the treatment of ores at high temperature to convert ore minerals to raw metals, or intermediate compounds for further refining. Roasting, smelting and converting are the most common pyrometallurgical processes. Pyrometallurgy uses high temperatures to transform metals and their ores. ...

A roasting process is used to extract metals from sulfide ores: in this process the ore is heated in the presence of oxygen and the sulfur is oxidised and driven off as sulfur dioxide. Some metals in this process remain in the sulfide form, while other metals are turned into an oxide form. The desired metal may be in either product. This article is about the chemical element oxygen. ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ... Sulfur dioxide (or Sulphur dioxide) has the chemical formula SO2. ...

Oxidative smelting and converting are similar to the roasting process, but differ slightly in the way that the processes' temperatures are high enough to promote melting of materials. Some mineral are more reluctant to oxidation, so they remain in the sulfide form, while other minerals are completely oxidized and form compounds with additives, often called flux. Molten sulfides and oxide compounds split in two layers because of the different specific weights. The flux visualized. ...

The created in these operations sulfur dioxide and carbon dioxide are major pollutants. Sulfur dioxide (or Sulphur dioxide) has the chemical formula SO2. ... Carbon dioxide is an atmospheric gas composed of one carbon and two oxygen atoms. ... Pollutants are substances which directly or indirectly damage us or the environment. ...

Hydrometallurgy

Hydrometallurgy involves the use of aqueous solutions to extract metals or compounds from their ores. Some of the hydrometallurgical processes include leaching, precipitaion of insoluble compounds, pressure reduction. Hydrometallurgy involves the use of aqueous chemistry to purify metals or mineral concentrates. ... Drinking water This article focuses on water as we experience it every day. ...

Leaching is a process for chemical dissolution of the desired minerals in aqueous solutions. Due to the difference in the dissolution rates, it is possible to separate the compounds of different metals. Often, some oxidative reagents need to be added to promote leaching. Leaching is the process of extracting a substance from a solid by dissolving it in a liquid. ...