Question

what is the methods of extraction of crude metal from the ore
Tell ot briefly​

Answer 1

Answer:

Roasting- During this process, extraction is done by heating the ore in a regular supply of air. Sulphide ores of elements such as Zinc, Lead and Copper are treated and concentrated using this methodology. The sulphur in the ore, at high temperature reacts with the oxygen to form Sulphur Dioxide and escapes out.

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Answer 2

Answer:

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Explanation:

What is Crude Metal?

The ore is considered as crude metal. It is a solid mass from which pure metal can be obtained.

 

Steps for Extraction of Metal

Extraction of metals involves three major steps:

Concentration of Ore

Isolation of metal from the concentrated Ore

Purification of the metal

Isolation of metal from the concentrated Ore involves the refining of metals from the compounds. The first step is to convert an ore into an oxide. Then the oxide is reduced using a reducing agent. 

Conversion to Oxide- Metal refining is done by heating the ore in a limited supply or absence of oxygen.  For example, hydrated ferric oxide is heated to form dry ferric oxide.

Fe2O3.xH2O(s)  → Fe2O3 (s) + xH2O(g)

Fig. 1. Equation of conversion ore to oxide

Roasting- During this process, extraction is done by heating the ore in a regular supply of air.  Sulphide ores of elements such as Zinc, Lead and Copper are treated and concentrated using this methodology. The sulphur in the ore, at high temperature reacts with the oxygen to form Sulphur Dioxide and escapes out.

2ZnS      +    3O2         →     2ZnO + 2SO2

Fig. 2. Roasting

Reduction of Oxide to Metal – It is a process of removal of oxygen. Generally, reducing agents such as carbon or carbon monoxide is used in this step. Carbon is added to the metal oxide obtained from the ore and then heated.

MxOy + yC → xM + y CO