Chemistry - Metallurgy Question with Solution | TestHub

Question Explanation: Identify the false statement(s) about the molten matte obtained during copper extraction.

Concept: Copper Extraction (Matte Treatment).

Solution: The molten matte $\left({\mathrm{Cu}}_2\mathrm{S}+\mathrm{FeS}\right)$ is produced in the smelting step.

(1) Correct: Matte is treated in a Bessemer converter (Bessemerisation).

(2) Incorrect: Molten matte is an intermediate product. The resulting crude metal (Blister Cu) is electrolyzed for final refining, not the molten matte itself.

(3) Correct: In the Bessemer converter, a blast of air and sand ( ${\mathrm{SiO}}_2$ flux) is blown through it to form slag and then metal (self-reduction).

(4) Incorrect: ${\mathrm{CuSiF}}_6$ crystallization is not involved.

Final Answer: molten matte is electrolysed and It is dissolved in CuSiF₆ and crystallised.