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本文在有还原剂木炭存在条件下研究了锡石的溶解度。通过SnO_2-C-HCl-H_2O和SnO_2-C-NaCl-H_2O两体系的实验研究,确定锡石易于在还原的条件下溶解,其它实验条件不改变,加木炭可使锡石的溶解度提高三个数量级左右。同时实验还发现,锡石的溶解度与温度呈正相关关系,并随介质酸度的增大而显著提高。经用HgCl_2试剂定性检查,得出与锡石平衡的溶液中有Sn(Ⅱ)离子存在。据实验结果,笔者认为锡易于在还原的、温度较高的和酸性的条件下迁移。
This paper studied the solubility of cassiterite in the presence of reducing agent charcoal. Through the experimental study of SnO_2-C-HCl-H_2O and SnO_2-C-NaCl-H_2O, it was confirmed that cassiterite was easily dissolved under reducing conditions and the other experimental conditions did not change. The addition of charcoal could increase the solubility of cassiterite by three About the order of magnitude. At the same time, the experiment also found that the solubility of cassiterite has a positive correlation with temperature, and increases with the increase of medium acidity. Qualitative examination with HgCl 2 reagent showed that there is Sn (Ⅱ) ion in the solution equilibrated with cassiterite. According to the experimental results, I believe that tin is easy to migrate under reduced, high temperature and acidic conditions.