Abstract
The chlorination of reagent PbS and natural ore galena with $NH_4Cl$ was investigated to find a new extraction metallurgical process of lead. The proper conditions for the chlorination of galena were that reaction temperature ; $425^{\circ}C$, $NH_4Cl$ weight ratio to galena ; 4.0 and reaction time ; 2hrs. Under these conditions, PbS was successfully chlorinated to $PbCl_2$ and the conversion was 90%. And also $NH_4Cl$ was effectively decomposed and was separated $NH_3$ and HCl. HCl was a chlorinating agent and 90% of $NH_3$ was recovered through this chlorination reaction.
$NH_4Cl$을 염소화제로 사용하여 시약 PbS와 Pb함유 자연광물인 방연광의 염소화 반응에 대해 조사하였다. 방연광의 적정 염소화 반응조건은 반응온도 $425^{\circ}C$, 방연광에 대한 $NH_4Cl$의 무게비 4.0, 반응시간 2시간이었다. 이 조건하에서 방연광중의 PbS는 $NH_4Cl$에 의해 효과적으로 $PbCl_2$로 염소화되었으며 그 전화율은 90%였다. 방연광의 염소화 반응에서 염소화제로 사용한 $NH_4Cl$은 $NH_3$와 HCl로 효과적으로 분리되었으며 양론적으로 90%의 $NH_3$를 회수할 수 있었다.
