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Author: Admin | 2025-04-28
1989.29 The main conclusions of the Piret review are:Metallurgical slags offer a limited capacity to capture arsenic, mainly due to the reducing conditions in which they are treated.Gas phase elimination and subsequent processing of condensed dust are more suitable for arsenic capture.Arsenic capture as speiss form is advantageous.Recycling of intermediate products should be directed to processes in which arsenic can be effectively separated from the metal phase.Hydrometallurgical processing is the most suitable process route for separate processing of intermediate arsenic-containing materials.Effluent processing techniques allow the separation and recovery of arsenic in intermediate product. However, safe disposal of these arsenic intermediate streams will require developing environmentally stable compounds.Wet gas cleaning is an unavoidable step if lower gas emission standards are applied.Most of the above criteria have been gradually applied to modern smelting operations, with new technologies being used for arsenic recovery, and safe disposal from copper smelting dust, refinery effluents, gas cleaning, and wastewater processing being gradually achieved.In the last 30 years, a great deal of effort has also been made to develop alternative technologies to process high-arsenic-containing materials. Focus has been on:Developing niche technologies for processing specific ore bodies from mine to cathode using a combination of hydrometallurgical techniques and solvent extraction and electrowinning.Selective flotation to depress and concentrate high-arsenic streams.Renewed interest in roasting of high-arsenic-containing materials.Leaching of high-arsenic copper concentrates (alkaline and acid environments).Stabilization of arsenic residues in crystalline stable structures such as scorodite.Vitrification of high-arsenic-containing materials in smelting slags.Table IV shows the level of development of some technology responses for processing complex arsenic-containing materials.30, 31 Most of these technologies have been developed to process high-arsenic-containing streams. However, with blending continuing to be the most popular approach, a gradual increase in arsenic content in copper concentrates—and a faster increase in the tonnes of arsenic processed—should be expected. This will
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