Solid waste identification of lead-containing material with high content of arsenic and iron
Solid wastes identification were conducted on a batch of samples declared as"lead ore"with high content of arsenic and iron.Through the feature detection and analysis including elemental content,phase composition,microtopography,particle size distribution and pH of leaching solution,it was found that the main phases of this sample were jarosite and scorodite.The main elements included S,Fe,Si,As,Al and Ca,while the content of Pb was low,which was not consistent with the characteristic of common lead ores.Several solid wastes with similar composition were compared to infer the sample source.Several pos-sibilities of sample source were excluded:jarosite slag in traditional zinc hydrometallurgy,oxygen pressure leaching slag of zinc concentrate,arsenic slag of flue gas cleaning in lead-zinc smelting,or arsenic deposi-tion slag of mineralized arsenic fixation of metallurgical waste water.Finally,it was inferred that the sam-ple was possible the lead-zinc ore tailings which was exposed to the earth's surface.The refused ore mainly containing scorodite and jarosite was formed after long-term oxidization.According to GB 34330-2017,the sample was identified as solid waste.
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