The effect of primary copper slag cooling rate on the copper valorization in the flotation process

  • Aleksandar Mihajlović
  • Željko Kamberović
  • Marija Korać
  • Milorad Gavrilovski
  • Nikola Jovanović
Keywords: slag, copper, slow cooling, nonstationary cooling

Abstract

Technological procedure of slow cooling slag from primary copper production is applied in the purpose of copper recovery in the level of 98.5% to blister. This technological procedure is divided into two phases, first slow cooling of slag on the air for 24 hours, and then accelerated cooling with water for 48 hours. Within the research following methods were used: calculation of nonstationary slag cooling, verification of the calculation using computer simulation of slag cooling in the software package COMSOL Multiphysics and experimental verification of simulation results. After testing of the experimentally gained samples of slowly cooled slag it was found that this technological procedure gives the best results in promoting growth or coagulation of dispersed particles of copper sulfide and copper in the slag, thereby increasing the utilization of the flotation process with a decrease of copper losses through very fine particles.

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