|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||Outotec Gypsum Removal Circuit and Outotec Cooling Tower Performance in Neutral Solution Cooling
||Tuomas Hirsi, Bj÷rn Saxen
|On-Site Speaker (Planned)
In a gypsum removal process a solution which is saturated with calcium is cooled to lower temperature with solution cooling towers to remove gypsum (CaSO₄Ě2H₂O) before next process step. In zinc refineries gypsum removal is part of the solution purification step before electrowinning. Gypsum removal after leaching is important to control the maintenance load of the downstream equipment.
Outotec gypsum removal plant has been started in 2018 as a part of the zinc direct leaching plant in Torreon, Mexico. The plant utilizes Outotec cooling towers for solution cooling and Outotec high rate thickener for solid particle separation from the solution flow. First operation results are showing efficient gypsum removal from the solution flow.
In this paper we present the Outotec gypsum removal process, show results from operation and discuss the importance of efficient operation and low emissions from the solution cooling.