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ORE CONCENTRATION TECHNOLOGY
ArticleName Intensification of selective flotation of copper-zinc ores by thermomechanical modification of zinc minerals' surface
ArticleAuthor Zimin A. V., Nemchinova L. A.
ArticleAuthorData

Author 1:
Name & Surname: Zimin A. V.
Company: RIVS Science and Production Association (Saint-Petersburg, Russia)
Work Position: General Director
Scientific Degree: Candidate of Engineering Sciences
Contacts: e-mail: rivs@rivs.ru


Author 2:
Name & Surname: Nemchinova L. A.
Company: RIVS Science and Production Association (Saint-Petersburg, Russia)
Work Position: Head of Research Laboratory
Scientific Degree: Candidate of Engineering Sciences
Contacts: e-mail: L.Nemchinova@mail.ru

Abstract

Based on the research background, the authors handle the problem on the enhancement of selective flotation of copper–zinc ore by thermomechanical modification of surface properties of sphalerite and pyrite, which will improves the zinc concentrate quality. Infrared spectrometry showed the change in the composition of surface compounds on sphalerite and pyrite after thermomechanical treatment by steaming, regrinding and mechanical attrition. Based on the research, it is supposed that reduction of sulfates and carbonates on sphalerite surface contributes to stronger attachment of a collector owing to formation of partially soluble zinc sulphide xanthate tightly bound with mineral lattice by its sulphide group (S2–), which ensures hydrophobization and flotation of sphalerite grains. Intensive development of hydroxide compounds of iron on pyrite surface in the mean time results in hydrophilization and depression of floatability of pyrite. Using the revealed mechanisms, the higher quality zinc concentrate process has been developed and has increased zinc content of the zinc concentrate by 2.2 % (up to 51.6 %). The developed process conditions for higher quality zinc concentrates have been included in the production procedures for reconstruction of operating processing plants at the copper–zinc ore deposits of Gaisky, Yubileiny (Ural Mining-and-Metallurgical Company), Priorsky (RMK Ltd), and in the project of a processing plant at Novo-Shemur copper–zinc ore deposit (Ural Mining-and-Metallurgical Company).

keywords Copper–zinc ore, flotation, thermomechanical treatment, extraction, sphalerite, pyrite, steaming, mechanical attrition, regrinding, reconstruction
References

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