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Journal of Industrial and Environmental Chemistry

Volume 2

GREEN CHEMISTRY &

TECHNOLOGY

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

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.

BIOGRAPHY