2 ZnS + 3 O₂ → 2 ZnO + 2 SO₂Example of oxidizing roasting d’a zinc sulphide.
Use when: Idealized overall assessment; the presence of other phases changes the total balance.
Sulfide concentrate roasting
Distinguish between oxidation of a sulfide and fusion of a charge.
What is happening?
Roasting transforms a sulfide by reaction with a gaseous, often oxidizing, atmosphere. Solid cullet and gases are produced; depending on the conditions, several intermediate phases can form.
The control concerns the oxygen supply, the temperature and the capture of dust and gases. The simplified equations explain the balance without representing all the intermediates of a real ore.
The formulas, with their conditions.
Rdéssulfuration = 1 − mS,résidu / mS,entréemS: masses of sulfur on the same perimeter.
Use when: Include gas and dust outlets to close the balance sheet.
Where is this principle used?
sulfide metallurgical plant
Prepare a cullet before a subsequent step.
Gas treatment plant
Recover or treat dust and SO₂ according to the industrial plan.
What to observe in the experiment
Monitor sulfur separately in the solid and in the gases. Observe the effect of insufficient or excessive air supply in the scenario.
References and readings
This sheet explains the principles and their assumptions. Educational simulation can simplify the process; an industrial model requires suitable data and validation.
Have you understood the essentials?
Only one correct answer per question. Answer all three questions, then view the answer key.
Intu Lab · Understanding sheet · Kimba Christian