Affiliation:
1. Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade
2. Technical Faculty at Bor, Bor
Abstract
Interest for application of hydrometallurgical processes in a processing of
complex sulphide ores and concentrates has increased in recent years. Their
application provides better metal recoveries and reduced emission of gaseous
and toxic ageneses in the environment. The kinetics and mechanism of
sphalerite leaching from complex sulphide concentrate with sulphuric acid and
sodium nitrate solution at standard conditions was presented in this paper.
The influences of temperature and time on the leaching degree of zinc were
investigated and kinetic analysis of the process was accomplished. With
temperature increasing from 60 to 90?C, the zinc leaching increased from
25.23% to 71.66% after 2 hours, i.e. from 59.40% to 99.83% after 4 hours. The
selected kinetic model indicated that the diffusion through the product layer
was the rate-controlling step during the sphalerite leaching. The activation
energy was determined to be 55 kJ/mol in the temperature range 60-90?C. XRD,
light microscopy and SEM/EDX analyses of the complex concentrate and leach
residue confirmed formation of elemental sulphur and diffusion-controlled
leaching mechanism.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Mechanics of Materials,Geotechnical Engineering and Engineering Geology
Cited by
28 articles.
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