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L. Xu and S. Ma
Conclusion
SSC + FF has been running for more than two months at Yunnan Chihong Zn & Ge
Huize smelter. The standard coal consumption per ton of zinc residues is ~310 kg,
which is 30–50% less than that of other existing residues treatment technologies.
The recoveries of Zn, Pb, Ag, and Ge all exceed 92%. Its energy consumption
index and recovery rate of valuable metals have reached the leading level in China.
SSC + FF has less tail gas emissions and high SO 2 content in the offgas of SSC,
which can be mixed with other high concentration offgas to produce acid with low
cost of offgas treatment.
At present, zinc residues treatment projects in Northwest Lead-Zinc Smelter and
Sihuan Zn & Ge Smelter in China all adopt this technology, and are expected to be
put into operation in 2020–2021.
Practice shows that SSC + FF technology reduces the cost of zinc residues treatment, improves the recovery of metals, and raises the zinc slag treatment technology
to a new stage. The technology can be applied to new construction and renovation
projects.