fire refining [冶] 火法精炼 ; 火精炼

fire refining of copper 铜火法精炼

fire refining of antimony 锑火法精炼

fire refining of crude lead 粗铅火法精炼

preliminary fire refining 预先火法精炼

the fire-refining 火法精炼

fire-refining copper 火法精炼铜

fire refining of tin 锡火法精炼

copper by fire-refining 铜火法精炼