Removal And Recovery Of Ni, Cu And Fe
From Heavy Metal Effluent By
Reduction Crystallization
Author(s)
T. P. Phetla, F. Ntuli & E. Muzenda
Abstract
Due to the fast depletion of water reserves globally, the toxicity of heavy metals
and the negative impact posed to the environment; the current focus in
wastewater treatment is now on the removal and re-use of these heavy metals
rather than removal and disposal in landfills. This study investigated the use of
hydrazine as a reducing agent to remove and recover Ni, Cu and Fe from
wastewater by reduction crystallization. Feasibility studies were carried out to
test the efficiency and find the optimum operating conditions for this method and
generate an understanding of the chemical and particulate process occurring. The
experiments were conducted on a 20L batch reactor using synthetic solutions
containing a mixture of nickel, copper and iron. The results show that hydrazine
can recover and crystallize Ni, Cu and Fe into their elemental form: 99.30% Ni
was removed from the Ni-solution, 99.26% Ni and 98.81% Cu were removed
from the Ni-Cu solution, over 99.90% Ni and 97.70% Fe were removed from the
Ni-Fe solution. Evolution of the PSD revealed that breakage and molecular
growth were the predominant particulate processes occurring, a finding which
was validated by the scanning electron micrographs of the powder obtained.
Keywords: metal powder, electroless plating, reduction crystallization, chemical
reduction, reducing agent.
1 Introduction
Heavy metal contaminated wastewater produced by acid mine drainage and
mineral processing occurs at estimated 70% of world’s mine sites, which makes
it one of the mining industry’s most significant environmental and financial
Keywords
metal powder, electroless plating, reduction crystallization, chemical
reduction, reducing agent
Related Book
Other papers in this volume
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