By Chander, Jagdish; Kumar, Anil
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5. 6. 7. 8. 9. Explain briefly the following i) Roasting ii) Calcination Explain froth floatation method for the concentration of sulphide ores. Differentiate between the followingi) Ore and mineral ii) Gangue and flux What is meant by leaching? Explain with an example. Comment on the statement 'every ore is a mineral but every mineral is not a ore'. Explain the difference between leaching and levigation. What is electrolytic reduction? Explain with an example. Describe one method used for the refining of metals.
In the fresh sample the moisture content is upto 60% however on suitably drying the moisture content reduces upto 10-15%. 5% Hydrogen = 5% Ash = about 4% Properties - It burns with long smoking flame and its calorific value is about 5500-7000 Kcal/kg. Uses - 1) Lignite is used as household fuel and for steam raising as boiler fuel. 2) It is also used in the manufacture of producer gas. iii) Bituminous Coal - It is the third stage of transfor-mation of wood into coal. This variety of coal is dark and opaque.
3. Low moisture contents - The moisture content of the fuel reduces the heating value and involves in a loss of money, because it is paid for at the same rate as the fuel. Therefor,e, an ideal fuel should have low moisture contents. Low non-combustible material - A good fuel must have low contents of non4. combustible material as the non-combustible matter is left as ash which decreases the calorific value of the fuel. Moreover, the disposal of ash is itself a great problem and it increases the cost of operation.
A comprehensive text book of applied chemistry by Chander, Jagdish; Kumar, Anil