Extraction of metals from sulphide ores is done by
1. Electrolysis
2. Smelting
3. Hydrometallurgy
4. Roasting
Answers
Answer:
ANSWER
1)Smelting is a process of applying heat to ore in order to extract a base metal. It is a form of extractive metallurgy. It is used to extract many metals from their ores, including silver, iron, copper, and other base metals. Hematite is one of the most abundant minerals on Earth's surface and in the shallow crust. It is an iron oxide with a chemical composition of Fe
2
O
3
.
Fe
2
O
3
(s)+3C(s)
→
Heat
2Fe(s)+3CO(g)
2)Self-reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu, etc., are heated in the air so as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.
Copper glance (Cu
2
S) is roasted in the presence of air. Roasting turns copper glance (ore of copper) into copper (I) oxide. Copper oxide is then heated in the absence of air. This reduces copper (I) oxide into copper metal.
3) Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.
Bauxite ore is the world's primary source of aluminium. The ore must first be chemically processed to produce alumina (aluminium oxide). Alumina is then smelted using an electrolysis process to produce pure aluminium metal. Bauxite is typically found in topsoil located in various tropical and subtropical regions.
4)Hydrometallurgy is a technique within the field of extractive metallurgy, the obtaining of metals from their ores. Hydrometallurgy involves the use of aqueous solutions for the recovery of metals from ores, concentrates, and recycled or residual materials. This process is used in the extraction of less electropositive or less reactive metals like gold and silver.
Malachite, which is an oxidized copper ore, can be used to produce copper. Because malachite ores are generally low-grade, hydrometallurgical methods are often applied to obtain copper from them.