PURPOSE: To reduce the amount of mercury to be added to zinc by using zinc- thallium-mercury alloy and alkaline electrolyte prepared by dissolving a specified amount of zinc oxide.
CONSTITUTION: A zinc-thallium-mercury alloy anode and alkaline electrolyte containing 1∼7% zinc oxide are used. For example, monothallium nitrate is dissolved in water, then zinc powder is added in the solution and stirred. The solution is filtered out and zinc-thallium alloy obtained are dried at 70°C. The zinc- thallium alloy is added into potassium hydroxide solution, then mercury is added to it, and they are stirred and filtered and washed until the pH of the filtrate becomes about 7. The alloy powder is dried under reduced pressure at 40°C. Zinc-thallium-mercury alloy powder having a amalgamation ratio of 0.5% is obtained.
UBUKAWA SATOSHI
YANO MUTSUMI
