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铅的冶炼过程大致如下:①富集:将方铅矿(PbS)进行浮选;②焙烧:2PbS+3O2
2PbO+2SO2;③制粗铅:PbO+C
Pb+CO↑、PbO+CO
Pb +CO2。下列说法正确的是 [ ] A.浮选法富集方铅矿的过程属于化学变化 B.方铅矿焙烧反应中,PbS是还原剂,还源产物只有PbOC.整个冶炼过程中,制取1 mol Pb共转移2 mol电子D.将1 mol PbS冶炼成Pb,理论上至少需要消耗6g碳
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