Tag: extraction of metals from ore

When a solid melts the temperature remains same until the whole solid melts.

The heat is used up in changing the state overcoming the forces of attraction.

The compounds of reactive metals from which metals extracted and purified are called ores of metals. Metals can be extracted from ore by reduction and electrolysis.

It is easier to obtain a metal from its oxide, as compared to its sulphides and carbonates. Therefore, prior to reduction, the metal sulphides and carbonates must be converted to metal oxides.

Ores contain large amount of impurities, which is called as gangue. The process of removing of impurities by physical means of methods like hand picking, crushing or pulverizing and grinding) is called dressing of ore.

Reduction is the process of removal of oxygen for extraction of metals from their oxide ores.

Electrolysis is the process of decomposition of a substance by passing electricity through it in a molten or dissolved state. 

Different processes applied in order to increase the percentage of metal in the ore is called concentration of ore.

Ores found in the form of sulphide and carbonates are first converted to their oxides by the process of roasting and calcination. Heating of sulphide ores in the presence of excess air to convert them into oxides is known as roasting.

It is easy to obtain metals from their oxides. So, ores found in the form of sulphide and carbonates are first converted to their oxides by the process of roasting and calcination.