Formation of hydrogen peroxide by sulphide minerals
Formation of hydrogen peroxide by sulphide minerals
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DOI：
10.1016/j.hydromet.2013.10.011
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发表时间：
2014-01-01
期刊：
影响因子：
4.7
通讯作者：
Rao, Kota Hanumantha
中科院分区：
文献类型：
--
作者：
Nooshabadi, Alireza Javadi;Rao, Kota Hanumantha
研究了硫化矿物在磨矿过程中过氧化氢（H2 O2）的生成规律。发现黄铁矿（FeS 2）、黄铜矿（CuFeS 2）、闪锌矿（（Zn，Fe）S）和方铅矿（PbS）（它们是地球上最丰富的硫化物矿物）在水中存在溶解氧的情况下在湿磨期间以及在干磨之后立即将固体置于水中时在纸浆液体中产生H2 O2。黄铁矿产生H_2O_2的量最大，其顺序为黄铁矿>黄铜矿>闪锌矿>方铅矿。水的pH影响过氧化氢形成的程度，其中在高酸性pH下产生更高量的H2 O2。此外，混合硫化物矿物，即，黄铁矿-黄铜矿、黄铁矿-方铅矿、黄铜矿-方铅矿和闪锌矿-黄铁矿、闪锌矿-黄铜矿和闪锌矿-方铅矿对H_2O_2生成的影响表明，在黄铜矿-黄铁矿、方铅矿-黄铁矿和闪锌矿-黄铁矿组成中，随着黄铁矿含量的增加，H_2O_2生成量增加。结果还证实了H2 O2的生产量与硫化物矿物的静止电位;较高的硫化物矿物的静止电位导致更多的H2 O2的形成。在硫化亚铁存在的情况下，H2 O2很可能是硫化物矿物氧化和有色金属硫化物溶解的原因，此外还有电流相互作用。这项研究强调了重新审视黄铁矿和其他硫化物矿物之间的电化学和/或电流相互作用的必要性，在不可避免的H2 O2存在的背景下，他们的浮选和浸出行为。(C)2013爱思唯尔有限公司版权所有。
Formation of hydrogen peroxide (H2O2), an oxidizing agent stronger than oxygen, by sulphide minerals during grinding was investigated. It was found that pyrite (FeS2), chalcopyrite (CuFeS2), sphalerite ((Zn,Fe)S), and galena (PbS), which are the most abundant sulphide minerals on Earth, generated H2O2 in pulp liquid during wet grinding in the presence of dissolved oxygen in water and also when the solids are placed in water immediately after dry grinding. Pyrite generated more H2O2 than other minerals and the order of H2O2 production by the minerals found to be pyrite > chalcopyrite > sphalerite > galena. The pH of water influenced the extent of hydrogen peroxide formation where higher amounts of H2O2 are produced at highly acidic pH. Furthermore, the effect of mixed sulphide minerals, i.e., pyrite-chalcopyrite, pyrite-galena, chalcopyrite-galena and sphalerite-pyrite, sphalerite-chalcopyrite and sphalerite-galena on the formation of H2O2 showed increasing H2O2 formation with increasing pyrite fraction in chalcopyrite-pyrite, galena-pyrite and sphalerite-pyrite compositions. The results also corroborate the amount of H2O2 production with the rest potential of the sulphide minerals; higher rest potential of a sulphide mineral results in more formation of H2O2. Most likely H2O2 is responsible for the oxidation of sulphide minerals and dissolution of non-ferrous metal sulphides in the presence of ferrous sulphide in addition to galvanic interactions. This study highlights the necessity of revisiting the electrochemical and/or galvanic interactions between pyrite and other sulphide minerals in terms of their flotation and leaching behavior in the context of inevitable H2O2 existence in the pulp liquid. (C) 2013 Elsevier B.V. All rights reserved.