Zinc wastes may be in the form of lump wastes and the source of secondary zinc also include waste zinc coated iron and steel.
Removal of Iron from Hard Zinc for Production of Refined Zinc
Article Removal of Iron from Hard Zinc for Production of Refined Zinc
Hopefully, microbial electro-metallurgy, in which the electron transfer chain associated with microbial respiration plays a key role, can contribute to the process for dezincing galvanized steel and the recovery of Zn.
I worked on refining zinc with various contaminants, including iron, several years ago with zinc recovered from EAF dust. The initial step involved distillation of the zinc and was very promising.
bioextraction of zinc from multimetal ore using chemolithotrophic bacteria is already known technique
Removal of iron from zinc resources depends on the oxidation state of both Fe and Zn. If both are in reduced state, it will be bit easy through bio-leaching, otherwise acid leaching is preferable. After leaching precipitation of iron can be done.
Two important processes to developed to recover zinc from zinc waste are:
(1) Ion exchange process: A properly selected ion exchange resin can enable efficient operation, minimize running cost and provide maximum life time (more than 60 cycles). Hence proper selection of resin plays an important role in the success of an ion exchange process.
(2) Adsorption Process using organic-inorganic nanostructure materials.
Please see the references below:
1- Jha, M.K., V. Kumar and R.J. Singh, 2000. Review of hydrometallurgical recovery of zinc from industrial wastes. Resour. Conserv. Recycling, 33: 1-22.
2- S. Madhan Babu, C. Ahmed Basha and S. Murthy Shekhar, 2006. Recovery of Zinc from Zinc Waste By-adsorption Process. Journal of Applied Sciences. Volume 6:955-957, 2006.
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