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Occurrence of Metals

 

Table of Content


Occurrence of Metals and Non-Metals


Native Metals

A metal that exists in metallic form, either as pure metal or as an alloy. For example, cadmium, cobalt, bismuth, indium etc.

Two group of metals are found in nature. They are classified on the basis of their nature of existence, that is, whether they exists single or in alloys-

  • The gold group consists of gold, copper, lead, aluminum, mercury, and silver.

  • The platinum group consists of platinum, iridium, osmium, palladium, rhodium, and ruthenium.

Aluminum is the most abundant element in nature. It is a major constituent of silica and clay. Iron is the second largest metal that exists in nature after aluminum. The process of extracting metals from ores is known as Smelting which was discovered around 6500 BC.


Alloys

It is a mixture of two or more elements in which the major component is metal. Alloys are made to obtain desirable characteristics. The basic idea to make alloy is to make metal less brittle, hard and more resistant to corrosion. Alloys of iron is important in both quantity and commercial value. For example, stainless steel, cast iron, alloy steel etc. Iron alloyed with carbon gives low, mid and high carbon steels. Increase in carbon content reduces ductility and toughness. The addition of silicon to iron produces cast irons, whereas the addition of chromium, nickel and molybdenum to carbon steels results in stainless steels.

Name of Alloy

Metals Present

Uses

Brass

Copper and Zinc

Door handles and fittings

Bronze

Copper and Tin

Statues

Solder

Tin and Lead

Soldering metals together

Stainless Steel

Iron, Chromium and nickel

Cutlery, kitchen sinks

The alloys of aluminum, titanium, and magnesium are valued for their high strength-to-weight ratios, and magnesium can also provide electromagnetic shielding. These alloys are used in jet engines.
 

Ores

Ore is a naturally occurring material from which a metal can be extracted. They are extracted from the earth by the process of mining. 

Some common ores

Fig. 1. Some Common Ores

The basic extraction of ore deposits follows these steps:

1.   Prospecting or exploration- This is the first step in which the extent and value of ore where it is located is defined

2.   Conduct resource estimation-This is  to estimate the size and grade of the deposit.

3.   Conduct a pre-feasibility study -This is done to know about the practicality of the proposed idea.

4.   Conduct a feasibility study – This is to evaluate the financial viability, technical and financial risks associated with the project.

5.   Development- This step is used for building mine plant and equipment needed.

6.   The operation of the mine in an active sense

7.   Reclamation is the last step in which land is made suitable for future use.

Metals and their Method of Extraction

Fig. 2. Metals and their Method of Extraction
 

Some Metals and their Corresponding Ores

Name of the element

ores

Aluminum

Bauxite: Al2O32H2O

Corundum: Al2O3

Iron

 

Hematite: Fe2O3

Magnetite: Fe3O4

Copper

Copper Pyrite: CuFeS2

Copper Glance: Cu2S

Zinc

Zinc Blende: ZnS

Calamine: ZnCo3

Sodium

Rock Salt: NaCl

Sodium Carbonate: Na2CO3

Potassium

Karnalite: KClMgCl6H2O

Salt Petre: KNO3

Tin (Sn)

Tin Pyrites: Cu2FeSnS4

Classiterite: SnO2

 

Frequently Asked Questions (FAQs)


Q1. Which metal is found in free state in nature?

Sol. Only gold, silver, copper, and the platinum metals occur in nature in larger amounts. They are less reactive in nature, so occur free. Amongst the alloys found in native state are brass, bronze, pewter, German silver, etc.


Q2. Is metal natural?

Sol. Metal exists naturally but not in pure form.


Watch this Video for more reference
 


More Readings

Occurrence of Metals

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