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Abstract
Many nonferrous metals are produced from sulfur-bearing minerals. When pyrometallurgical processes are used, sulfur dioxide gas is formed as a byproduct. In many cases, a small but significant portion of the SO2 is oxidized further to SO3 within the pyrometallurgical reactor system. Upon cooling of the gases, as would occur when such gases contact the atmosphere, SO3 will absorb moisture and condense as a sulfuric acid aerosol, typically referred to as acid mist.