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首页> 外文会议>International Biohydrometallurgy Symposium, IBS-2001 Sep 16-19, 2001, Ouro Preto, Minas Gerais, Brazil >Effect of pH on the biological leaching of a black schist ore containing multiple sulfide minerals
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Effect of pH on the biological leaching of a black schist ore containing multiple sulfide minerals

机译：pH值对含有多种硫化物矿物的黑色片岩矿石生物浸出的影响

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摘要

The objective of the present work was to examine the effect of pH on the biological leaching of a black schist ore. This sulfide ore has a high silica content (about 42% SiO_2) and it also contains graphite. The main sulfide minerals are pyrite, pyrrhotite, pentlandite, violarite, chalcopyrite, and sphalerite. The leaching experiments were performed in stirred tank reactors at pH 1.5, 2.0, and 3.0 with a mixed culture inoculum. The respective chemical control experiments were also included in this study. The results showed that nickel was released into solution from the black schist ore even at pH 3.0. The maximum dissolution rates of nickel were similar at all pH values tested. Pentlandite and violarite accounted for about 80% of the Ni content; the rest of nickel was distributed in pyrite and pyrrhotite. The maximum leaching rate of copper was obtained at pH 3.0. The rates of zinc and silica dissolution increased at the lower pH values. At pH 1.5, Fe~(3+) precipitation was not apparent whereas at pH 2.0 jarosites were present, and at pH 3.0 Fe(III) solubility was negligible. Previous chemical leaching experiments had indicated substantial dissolution of silicate minerals below pH 2.5, accompanied with the formation of gelatinous precipitates that hindered the dissolution of metals at low pH range. The results in the present study showed successful solubilization of nickel from sulfide minerals over the pH range of 1.5 to 3. Leaching at pH 3 may be used for nickel solubilization because it suppresses silicate dissolution. Additionally, dissolved silicic acid flocculates and forms large agglomerates, which settle easily and do not interfere with the recovery of metals.
机译：本工作的目的是研究pH对黑色片岩矿石生物浸出的影响。这种硫化矿石的二氧化硅含量高（SiO_2约为42％），并且还含有石墨。主要的硫化物矿物为黄铁矿，黄铁矿，膨润土，堇青石，黄铜矿和闪锌矿。在具有混合培养接种物的pH 1.5、2.0和3.0的搅拌釜反应器中进行浸出实验。各个化学控制实验也包括在这项研究中。结果表明，即使在pH 3.0时，镍也从黑色片岩矿石中释放到溶液中。在所有测试的pH值下，镍的最大溶解速率均相似。膨润土和堇青石占镍含量的80％左右。其余的镍分布在黄铁矿和黄铁矿中。在pH 3.0时获得了最大的铜浸出率。在较低的pH值下，锌和二氧化硅的溶解速率增加。在pH 1.5时，Fe〜（3+）沉淀不明显，而在pH 2.0时存在钾铝石，在pH 3.0时，Fe（III）的溶解度可忽略不计。先前的化学浸出实验表明，pH值低于2.5的硅酸盐矿物会大量溶解，并伴随着凝胶状沉淀的形成，阻碍了低pH范围内金属的溶解。本研究的结果表明，在1.5至3的pH范围内，成功地从硫化物矿物中溶解了镍。pH3的浸出可用于镍的溶解，因为它可以抑制硅酸盐的溶解。另外，溶解的硅酸絮凝并形成大的附聚物，其容易沉降并且不干扰金属的回收。

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