Sulphuric Acid Production Plant

Process units

The roasting and sulphuric acid plant consists of several basic process flow lines, distributed in four units:

• Roasting
• Sulphuric Acid
• Neutralization and Cooling Cycles
• Steam Production and Water Demineralization

The Roasting Unit operates with a fluid bed roaster and the Sulphuric Acid Unit uses double catalysis – double absorption system (DCDA system).

Lurgi’s modern system for zinc concentrates roasting and sulphuric acid production from process gases is characterized by its high specific efficiency, compactness, effective utilization of the heat from the hot roaster gases and flexibility as concerns stopping and start up of the different installations and decreasing the hazardous emissions within the standard limits. For the purpose of the utilization of the heat from the gases there is a boiler installed directly after the fluid bed roaster.

The DCDA system in the Sulphuric Acid Plant ensures a decreased SO₂ content in the waste gases to a level below 500 mg/nm³ which guarantees keeping of the most rigorous standard limits of concentration in the waste gases emitted to the atmosphere.

The equipment and process flow diagram of the installations for zinc concentrates roasting, gas cleaning and sulphuric acid system are designed by Lurgi.

The processes in the Roasting and Sulphuric Acid Plant are controlled by DCS (Distributive Control System) in the Control Room. The four operation stations ensure a complete supervision of the equipment.