立型亜鉛レトルト用団鉱の新しい製造法

抄録

A new method of producing hard briquettes for the vertical retort has been developed. This method requires only zinc oxide calcine and coking coal, and can eliminate the use of spent liquor which has been becoming more expensive and less available. It can also considerably shorten the time to produce briquettes. The method includes mixing calcine and coal, preheating the mixture, briquetting the mixture into a cylindrical briquette of 1 cm in diameter, and coking the briquette. Effects of preheating time, briquetting force, coking temperature and time, particle sizes of calcine and coke, etc. have been examined to determine an appropriate condition under which briquettes of satisfactory strength have been obtained. More than 99% of zinc oxide in those briquettes is easily reduced in 60 min at 1050°C.