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P-1 Metallurgy — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Metallurgy3 Marks
Question
Complete the following flow chart and answer the questions below
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(i) In which method pine oil is used?
(ii) Explain that method of concentration in brief. (Practice Activity Sheet – 2)

✓

Answer


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(i) Pine oil is used in froth floatation method.

(ii) The finely powdered ore and vegetable oil such as pine oil, eucalyptus oil are mixed with water for formation of froth. The pressurised air is blown through the mixture. The agitator is used as per the requirement. Bubbles are formed due to the blown air. A foam is formed from oil, water and air bubbles together, due to the agitating. This foam rises to the surface of the water and floats. Hence this method is called froth floatation. Sulphide minerals float with the foam on water as they get and can be removed. The gangue particles are wetted by water, settles down at the bottom. This method is used forconcentration of zinc blend $( ZnS )$ and copper pyrite (CuFeS ${ }_2$ ).

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