反応熱をケミカルプローブとする金回収システムにおける還元終点のモニタリングシステム

概要

論文の詳細を見る
Monitoring system for detecting the reducing end point in gold recovering system is presented by using the reaction heat measurement as chemical probe. Sodium hydrogen sulfite was selected as reducing agent for gold(III) among the various agents examined, which yielded gold precipitation quantitatively. The reducing solution was pumped at a flow rate of 36 ml/min to the reaction vessel containing gold(III) solution and the increase in temperature was measured using thermistor detector. A linear relationship was observed between the gold(III) concentration up to 135 gAu/l and the increase in temperature. The relative standard deviation of recovered gold was 0.13% (n=4) for 60 g gold. The results of recovered gold mass from industrial waste in accessary factories agreed well with the one calculated from the increase of temperature.
社団法人日本分析化学会の論文
1993-04-05