Neutralisation of acid effluent from steel manufacturing industry and removal of metals using an integrated electric arc furnace dust slag/lime process.
Forsido, Tedlaye McCrindle, Rob Maree, Jannie Mpenyana‑Monyatsi, Lizzy
Forsido, Tedlaye
McCrindle, Rob
Maree, Jannie
Mpenyana‑Monyatsi, Lizzy
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Abstract
In this study, an integrated electric arc furnace (EAF) dust slag/lime (Ca (OH)2) treatment method was used to treat acid effluent generated by the same stainless-steel producer. EAF slag alone was able to raise the pH to 8.7; thereafter, lime was added to increase the pH to the target pH of 12. The test proved that EAF dust slag, in conjunction with lime, can be used for neutralisation of acid effluent from a steel industry and for the removal of metals Co, Cr, Fe, Ni and Zn. The target metals were removed from the effluent, achieving greater than 99.6% removal. The process was simple and involves only mechanical mixing of the two constituents. Hence, it can be regarded as economically advantageous and environmental
friendly since it only utilises a material considered as waste and a small quantity of lime. In addition to being a cost-effective replacement for expensive chemicals used in wastewater treatments, this method can alleviate the problem associated with the disposal of slag, a solid waste generated by a steel manufacturing industry.
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Date
2019-11-07
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Publisher
Springer
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Keywords
Acidity, EAF slag, Effluent, Metal removal, Neutralisation, Treatment