Industrial wastes such as slags, dust, or precipitation residues contain significant amounts of valuable metals like zinc, lead, and copper as well as precious metals like silver and indium. Nevertheless, a lot of these waste materials are not recycled, and therefore, many valuable metals end up being sent to landfills. Because of harmful components in the waste, it is often necessary to send it to specialized landfills for hazardous wastes, which leads to environmental problems as well as additional costs. Consequently, the recovery of the valuable metals from the residues represents a sensible task to decrease the negative impact on the environment and to reduce costs for maintaining a landfill. In addition, recycling helps to decrease the dependency from primary resources. The present study deals with the behavior of different metals in a pyro-metallurgical treatment for a mixture of jarosite and electric arc furnace dust with a special focus on indium and silver.

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Residues from stainless steel production contain notable amounts of hazardous compounds such as chromium and other heavy metal compounds. These potential toxicity results in restrictions regarding the reusability of chromium containing slags, leading to landfilling instead of using them for other applications such as a substitution for natural aggregates in the construction industry. The paper shortly describes the physical recovery of the metals contained in the slag and its problems as well as the possibilities of a pyro-metallurgical reduction treatment. Different authors investigated possibilities to recover chromium from slags and treat the resulting slag with additives in order to improve their properties. Literature shows that it is important to optimize the process parameters to maximize the metal recovery rates and to influence the slags' leaching behaviour as well as its properties to get a marketable product.