Metallurgical processing; Chemical processing of liquids; Processing of chemicals; Processing of materials; Processing of metallic materials; Processing of waste materials; Waste processing; Purification of liquids; Purification of materials; Recovery of precious metals; Recycling of batteries; Recycling of chemicals; Recycling of materials; Recycling of metals; Refining; Reprocessing of waste and scrap materials; Industrial treatment of effluents; Treatment of metals; Treatment of materials