ENVIRONMENTAL PROBLEMS OF METALLURGICAL PLANTS IN POLAR REGIONS AND WAYS FOR THEIR SOLUTION (NORILSK REGION AS AN EXAMPLE)

摘要

Emission of sulfur-containing gases causes most adverse impact on the natural environment in the process of nonferrous metals production. Under the conditions of Arctic regions, in particular in the region of the Norilsk Mining and Metallurgical Complex (Russia), this problem requires a special approach taking into account potential economic and socioeconomic consequences.rnBy reducing the iron sulfide content of flotation concentrates by using new flotation reagents inhibiting pyrrhotite flotation and by applying advanced process flowsheets for flotation it is possible to increase the nonferrous metals content of flotation concentrates by 5% or more along with a corresponding reduction in SO_2 formation during their subsequent pyrometallurgical processing.rnThe ways used to resolve the environmental problems in the Norilsk region in the process of nickel and copper production, are based on the improvement of methods for elemental sulfur recovery from metallurgical off-gas by non-conventional techniques, the sulfur recovery from metallurgical gases by production of liquid sulfur dioxide and the technology for pyrometallurgical treatment of sulfide concentrates without SO_2 formation.rnAnother opportunity is the development and commercial introduction of hydrometallurgical technologies for treating copper-nickel sulfide ores.