Preparation of High-purity Zinc Oxalate Powder by the Precipitation Stripping Method

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J. Korean Ceram. Soc. > Volume 29(12); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(12): 963.

Precipitation Stripping법에 의한 고순도 Oxalate 분말의 제조

이재천, 이강인, 유효신

한국자원연구소 희유금속연구그룹

Preparation of High-purity Zinc Oxalate Powder by the Precipitation Stripping Method

ABSTRACT

This paper describes the feasibility for a direct production of zinc oxalate powders from zinc-loaded D2EHPA solutions combining the purification and the precipitation in one operation unit. This process has the potential as an alternative to conventional method for the synthesis of zinc oxide precursor particles from the hydrometal-lurgical processes. Zinc was extracted into D2EHPA in kerosene and then zinc-loaded D2EHPA solution was emulsified with oxalic acid-HCl solution to precipitate zinc oxalate powder, which was readily calcined to zinc oxide. The precipitation kinetics and yield were sensitive to experimental conditions. The morphology, size and size distribution of the zinc oxalate powders varied with zinc/oxalate ion riatio, temperature, and the presence of SPAN 60, which affected nucleation, growth, and the emulsion characteristics.