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Journal of Industrial and Environmental Chemistry
|
Volume 2
GREEN CHEMISTRY &
TECHNOLOGY
7
th
International Conference on
J u n e 1 8 - 2 0 , 2 0 1 8 | D u b l i n , I r e l a n d
Wan-Bae Kim et al., J Ind Environ Chem 2018, Volume 2 | DOI: 10.4066/2591-7331-C1-003
RECOVERY EFFICIENCY OF ZR
ACCORDING TO PARTICLE SIZE OF
BAF2 FROM WASTE PICKLING ACID
SOLUTION OF ZR CLAD TUBE
Wan-Bae Kim, Seong-Hun Lee, Young-Jun Lee
and
Jong-Hyeon Lee
Chungnam National University, Republic of Korea
I
n order to manufacture Zr cladding, several pilgering and intermediate
heat treatment processes are required. During these processes, tube
surface contaminated by lubricant as well as oxide layers is cleaned by
a mixed hydrofluoric and nitric acids. As the number of pickling process
increases, the pickling efficiency decreases since Zr solubility in the
pickling acid decreases. As a result, the pickling solution requires frequent
replacement. The spent pickling acid is conventionally neutralized by
using caustic soda (NaOH), followed by an evaporation concentration
and finally disposed. Hence, the conventional waste treatment process
has inherent problem that the rare metal Zr dissolved in the spent pickling
solution can’t be recycled. This study investigates an environmentally
benign recycling method for Zr as well as the spent pickling acid that
involves adding BaF2 to spent pickling acids to produce Ba2ZrF8 through
chemical precipitation without neutralization. In particular, a particle size
analyzer, FE-SEM, EDX, ICP, and XRD analysis was utilized to evaluate the
Zr recovery efficiency according to the particle size of BaF2 which is used
as a precipitant and the characteristics of the precipitates. As a result
of experimentation, the Zr concentration in the recovered pickling acid
was found to be 127 ppm when the particle size of the BaF2 used as a
precipitant is 500 nm or lower, and the concentration of residual Ba in the
pickling solution was less than 100 ppm.
Wan-Bae Kim has studied at Chungnam Univer-
sity, Republic of Korea. His major is Electrore-
duction and Electrorefining. He has studied at
the Department of Materials Science and Engi-
neering and Nanomaterial process laboratory of
prof. Jong-Hyeon Lee.
dhksqo07@cnu.ac.krBIOGRAPHY