Choose the correct statement(s) for froth flotation process, which is used for the concentration of sulphide ore.a) It is based on the difference in the ability of different minerals to become wet.b) It uses sodium ethyl xanthate, C2H5OCS2Na as collector.c) It uses NaCN as a depressant in the mixture of ZnS and PbS, where ZnS forms soluble complex and PbS forms froth.
The correct option is D All statements are correct
In some sulphide ores of copper, zinc and lead, the concentration is brought by the froth flotation process. In this method, the advantage is taken of the preferential wetting of the ore by an oil. The finely ground ore is taken in a tank containing water and 1% of pine oil or turpentine oil.
Collectors (e.g., pine oils, fatty acids, xanthates, etc.) enhance the non-wettability of the mineral particles and froth stabilisers (e. g., cresols, aniline) stabilise the froth.
Sometimes, it is possible to separate two sulphide ores by adjusting the proportion of oil to water or by using ‘depressants’. For example, in the case of an ore containing ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.
Option D is correct.
In some sulphide ores of copper, zinc and lead, the concentration is brought by the froth flotation process. In this method, the advantage is taken of the preferential wetting of the ore by an oil. The finely ground ore is taken in a tank containing water and 1% of pine oil or turpentine oil.
Collectors (e.g., pine oils, fatty acids, xanthates, etc.) enhance the non-wettability of the mineral particles and froth stabilisers (e. g., cresols, aniline) stabilise the froth.
Sometimes, it is possible to separate two sulphide ores by adjusting the proportion of oil to water or by using ‘depressants’. For example, in the case of an ore containing ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.
Option D is correct.
