Question

(iii) Zinc has a melting point of 420°C and a boiling point of 907 °C. The temperature inside the a furnace is 1200°C. Explain how this information shows that the zinc produced inside the furnace is a gas.​

Answer 1

Answer:

Zinc concentrate, which contains approximately 55% zinc, is roasted at a temperature approximately 800°C (1472°F). The methods used to roast the concentrate have an intention to reduce the sulfur content by oxidation to below 1%, so that the zinc oxide product can be reduced by carbon in a retort furnace or blast furnace to zinc metal. The more completely the oxidizing roast is carried out, the better, as any zinc sulfide remaining in the calcines cannot be reduced by carbon during the retort furnace process and will be lost as unreacted in slag and discarded.