Electrolytic Zinc Production at Annaka Refinery

Abstract

Annaka Refinery of Toho Zinc Company Limited, located seventy miles to the northwest of Tokyo, has the annual production capacity of about 140, 000 tons of electrolytic zinc.
The plant, erected in 1937 for the production of 5, 300 tons of zinc annually, had been enlarged up to the current production capacity until 1967.
For the 1970's decade, confronted with tightening requirements for environmental control, rapidly escalating energy prices and increasing labor costs, extensive improvements were carried out.
This paper presents these significant improvements and achieved results.