Question

Look at the picture and answer the following questions

(a) Which separation technique is shown in the sketch?

(b) Label the parts marked

(c) What type of ores are separated by this method?

(d) What is the principle involved in this method?

(e) Mention the names of two ores purified by this method

Answer 1

(a) The given sketch depicts froth flotation method

This method is generally used to purify the sulphide ores.

(b) 1. The air supply

2. Water with pine oil

3. Gangue

4. Froth

5. Concentrated sulphide ore

(c) To purify the sulphide ores we can use froth flotation method

(d) The principle behind this process is sulphide ores can be wetted by the oil (insoluble in water) and impurities are wetted by the water (soluble in water), so that separation of impurities becomes easier

(e) Sulphide Ores can be purified by this technique

These are type of ores containing sulphide $\left({\mathrm{S}}^{2-}\right)$ part in it

Example: galena $\left(\mathrm{PbS}\right)$, cinnabar $\left(\mathrm{HgS}\right)$