Double-effect Central Circulation Evaporator for Metallurgy Effluent Treatment

Double-effect Central Circulation Evaporator for Metallurgy Effluent Treatment 

Project Description

      In this project, the high salinity wastewater was from gold metallurgy effluent, and it contains high salt content of sodium chloride and sodium sulfate, with solid content 25%wt. And the main problem in this problem was the small space for equipment layout as site. A double-effect central circulation evaporator was adopted because of the smaller occupied area required, and the overall height of the equipment was reduced to make the layout of the complete unit more compact.  

    There was circulating pumps installed under the evaporator, pushing the material circulating at the lower part of the evaporator, preventing the crystal solids from settling and caking which would lead to tube blockage. 

Process Technology   

      A double-effect central circulation evaporator was adopted for the metallurgy effluent treatment, and the overall process flow was: the high salinity metallurgy effluent was concentrated by a double-effect central circulation evaporator till oversaturated, and then the oversaturated liquor was transferred into a centrifuge for liquor-solid separation, and the solids separated were treated in further, and the mother liquor were returned to the evaporator to be concentrated again.

Equipment Description