NOUFERROUS METALLURGICAL EQUIPMENT

This paper introduces the process flow and equipment used in the off-gas cleaning procedure of the acid-making system. To address the problems such as the increase of system resistance, the accumulation of acid sludge in the equipment and pipelines, and the discharge of waste acid in excess of the standard limits during the off-gas cleaning operation, this paper envisages that a pressure controller be added at the feed port of acid sludge treatment system. At the same time, it upgrades the two settling tank underflow pumps into pumps completed with VSDs, enabling variable frequency and constant pressure liquid supply via PID control. After the transformation, it effectively reduces the problem of excessive pressure in the feed pipe of the filter press the operation stability and reliability of the off-gas cleaning system is improved, and the waste acid discharge meets the designed process indexes of the waste acid treatment system.