A Study On Ammonium Thiosulfate Recovered From Coke Oven Gas Desulfurization And Decyanization For Leaching And Phytoremediation Of Mercury-contaminated Soil

In recent years,the usage development of ATS has a great significance on treatment and resourcization of coke oven gas desulfurization and decyanization.This paper studied application of by-product ATS used as leaching pharmacy leaching Au and Ag,chelating agent for phytoremediation of mercury-contaminated soil.Using ATS as leaching pharmacy,we obtained the leaching conditions of silver flotation concentrates from Nanjing lead-zinc-silver ore:ATS countercurrent leaching process.The ATS was controlled of 0.10M mol/L,the CuSO4 concentration is 0.01 mol/L,liquid to solid ratio of the ore pulp is 4:1,leaching should be split into three sections at normal temperature,each ore pulp leaching time is 10 hours.The average leaching rate of Ag and Au achieve 92%and 55%;Second leaching residue leaches in high temperature,process conditions:ATS concentration is 0.20mol/L,the copper ion concentration 0.03 mol/L,leaching temperature is 60 Celsius,liquid-solid ratio of ore pulp 4:1.The average leaching rate of silver achieve an average 90%,gold achieve an average 76.2%.Using ATS as an inducer for phytoremediation of mercury soil:1,Calendula officinalis could endure 5mg/kg mercury pollution soil;ATS enhance Calendula officinalis remediates of mercury contaminated soil;ATS impact on soil mercury forms;determined the optimal dosage of ATS induced phytoremediation to mercury contaminated soil is 2g/kg soil.2,Found that ATS joint plant euphorbia esula remediating mercury contaminated soil have a better effect through the transplanting experiments.