Incineration facilitates recover precious metal from a myriad of precious metal bearing materials. Incineration combined with milling, screening and blending is used to convert combustible heterogeneous material into homogeneous material that can be sampled and assayed for precious metal content. Incineration also readies precious metal bearing material for further refining. Precious metal bearing polishing dust, filters, emulsions, waste treatment sludges, photo-paper, photographic film and silver bearing steel wool cartridges are some of the materials that are incinerated for precious metal recovery. Parameters such as material type, quantity, precious metal content and required stack emission levels are important in determining which types of incinerators are best suited for recovery of precious metals from a given material. This paper discusses modular starved air, rotary excess air, and mass burn waterwall combustors and which incinerator types are most suitable for specific precious metal bearing feed stocks.
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