Question

Name an ore, which is concentrated by:

1. Froth floatation process
2. Magnetic separation

Answer 1

a. Only sulphide ores can be concentrated by the froth floatation process because minerals oils used in the froth floatation process selectively wets the sulphide ore and brings it to the froth.

$\mathrm{PbS}$ (galena), $\mathrm{ZnS}$(zinc blend) ore concentrated by froth floatation process.

b. Ores in which one component is magnetic can be concentrated by magnetic separation.

${\mathrm{Fe}}_2{\mathrm{O}}_3$(Hematite) is concentrated by magnetic separation.