Abstract
The management of residues from the metallurgical industry is an integral part of waste management. Mercury sludge is a by-product of the acid-making step and has a high content of Hg in the form of HgS and HgO. With the development of zinc industry, proper utilization of the high-risk mercury sludge has drawn great attention. In this paper, a new technology for recovery of Hg from mercury sludge enhanced by NaClO addition and microwave heating is proposed. By adopting various analysis techniques, effect of NaClO addition and microwave-assisted drying in the pre-treatment process are demonstrated. Results showed that microwave-assisted drying can increase the oxidation of mercury sludge, and NaClO can react with HgS to produce HgO and Hg, two volatile materials. The pre-treatment effect is optimum when mixing ratio of NaClO to mercury sludge is 1:2. Moreover, upon roasting this sample in microwave equipment at 450 °C for 20 min, Hg recovery can reach 92.31%.
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