C22B3/06 — Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, with acids generated in situ; in .
Mar 03, 2009· Extraction of metals Only some unreactive metals such as silver, gold and platinum can occur freely in nature. Most metals react with other elements to form o. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Extraction and Reduction of Metals Essay Sample. Metals are usually obtained from their minerals, by a process called reduction. There are several most common occurring metals found in the earths crust. Most of these are found in the form of minerals or ores.
Sep 02, 2012· It is a naturally source of a metal, and the metal can be extracted from it. Ore is commonly the oxides of metals ( bauxite is hematite is Al 2 O 3, hematite is Fe 2 O 3 and rutile is TiO 2) or the sulfides ( pyrite is FeS 2 and chalcopyrite is .
In the extraction of metals, some factors are taking into consideration such as the chemical composition of the compound containing the metal, level of impurities and the extent of chemical reactivity of the ores or mineral constituents of these metals.
The extraction of metal usually requires the appliction of heat to separate the metal from it's matrix, the stuff mixed with the metal. This is called "Smelting". Each metal melts at a different ...
Jun 06, 2017· Application of the reactivity series of metals towards oxygen in the extraction of metals: Only a few metals such as platinum, gold and silver are found free in nature. Other metals have to be extracted from their ores. Ores are naturally occurring rocks that contain high concentration of one or more mineral of metals.
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describe and explain the main reactions involved in the extraction of iron from iron ore (haematite), using coke, limestone and air in a blast furnace Coke is a .
Extraction Process of Aluminium from Bauxite Ore. Aluminum is the most abundant metal in the earth's crust and is a constituent of many minerals. However, the material which is highest in aluminum and most free from objectionable impurities is bauxite which, therefore, is practically the only source of the metal under present processes.
The extraction of aluminium involves two steps that is, purification of bauxite by Baeyer's process and electrolysis of alumina. 1. Purification of bauxite by Baeyer's process In the Baeyer's process, the bauxite ore is heated with concentrated NaOH solution under pressure (Aluminum is purified by leaching method).The alumina dissolves as sodium meta aluminate.
Extraction of Metals. The least reactive metals are found native as elements silver, gold, but most are found in compounds, usually oxides or sulphides. The occurrence in nature of metals will affect the cost of extracting and engineering them. Most metals are found as ores usually either as an oxide or a sulphide.
Extraction by electrolysis (including aluminium) Metals that are more reactive than carbon aluminium are extracted by electrolysis of molten compounds.
Oct 09, 2017· Metals above carbon in the reactivity series cannot be extracted from their oxides by heating them with carbon. This is because the metal bonds to Oxygen so strongly and the carbon is not reactive enough to remove it. So,we have to use electrolysis to extract metals such as aluminium,magnesium and calcium.
Unreactive metals such as gold are found in the Earth itself. Some metals are found as compounds and require chemical reactions to extract the metal. The process of extraction. Metals that are less reactive than carbon can be extracted from their oxides by reduction (removal of oxygen) with carbon.