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一、碱性精炼的机理碱性精炼作业,系将計算好的純碱量加入熔融的銻液表面,随即插入鑄铁管鼓入压縮空气。当空气沿銻液上升时,部分銻和砷即按下式氧化。 2Sb+(2/3)O_2→Sb_2O_3…………………(1) 2As+(3/2)O_2→As_2O_3…………………(2) 根据Sb_2O_3的-ΔH_(298)=167.0(大卡/克分子),As_2O_3的-ΔH_(298)=156.8(大卡/克分子)可知道,这里并不存在着砷的优先氧化的問題,这一点根据有关純烟化(仅鼓入空气而不加純碱)的实践資料亦可
First, the mechanism of alkaline refining Alkaline refining operation, the Department of the calculated amount of soda ash molten antimony added to the surface, then inserted into the cast iron pipe drums into the compressed air. As the air rises along the antimony solution, some of the antimony and arsenic are oxidized as follows. 2Sb + (2/3) O 2 → Sb 2 O 3 (2) 2As + (3/2) O 2 → As 2 O 3 (2) According to the value of -ΔH 298 of the Sb 2 O 3 = 167.0 (298) = 156.8 (kcal / mol) of As 2 O 3, it is clear that there is no problem with the preferential oxidation of arsenic here, as is the case with respect to pure smoking Without soda) practical information can be