Study On Melting Disposal Technology Of Non-ferrous Metals Hazardous Waste Residues After Valorization

The valorization of non-ferrous metals hazardous wastes has gained increased attention.However,in the process of valorization,there would still be residues without extraction value,whic has become new problems.In this study,the mixed resource residue(CHS)produced by a hazardous waste treatment enterprise in Zhejiang Province was studied.The feasibility of low-energy melting treatment was studied.Moreover,the harmless degree and the long-term behavior were characterized.It aims to provide theoretical basis for the harmless recycling of non-ferrous metal solid waste.Firstly,it was found that the content of CaO and Na2O in CHS accounted for 19.0%and 44.9%,respectively,and the content of SiO2 in ganister slag(GS)and silicon tetrachloride cracking slag(STCS)were 81.6%and 58.1%,respectively.The melting co-disposal of GS,STCS and CHS is expected to form an amorphous network structure to fix heavy metals.Secondly,the experiment on melting co-disposal of CHS,GS and STCS showed that the higher the SiO2 content in the CHS,GS and STCS melting co-disposal process,the better the heavy metal fixing effect.The critical temperature corresponding to the six conventional heavy metal leaching concentrations is 1000 0C and the holding time is 1.5 h.Finally,the long-term intensified erosion of simulated environmental factors showed that the melting co-disposed products can resistant the erosions from acid rain,salt,freeze-thaw,and weathering for 1054 years,2.7×1047 years,2.7×10492 years,and 2.7×10493,respectively.It is a complete safe material without danger threaten.