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首页> 外文会议>XXI International Mineral Processing Congress >COMPARATIVE STUDIES OF THE SURFACE ACID-BASE PROPERTIES OF PYRITES FROM COAL AND ORE SOURCES
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COMPARATIVE STUDIES OF THE SURFACE ACID-BASE PROPERTIES OF PYRITES FROM COAL AND ORE SOURCES

机译：煤和矿石中硫铁矿的表面酸碱性质的比较研究

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摘要

Solution pH plays an important role in controlling the surface properties of coal and pyrite in processes like flotation. In the present investigation, the effect of pH on the surface free energy of pyrites, from both coal and ore sources have been studied. The surface free energy of solids is made up of two components, the dispersive surface free energy and the acid-base interaction energy. Various methods have been used by other researchers to evaluate these two components for coal and other solids. But a new approach was used in the present study to evaluate both the components of surface free energy for different pyrites. Results indicate that the dispersion free energy of different pyrites is independent of the solution pH while the acid-base interaction energy is strongly dependent on the solution pH. The change in acid-base interaction energy with pH is more significant for ore pyrite than coal pyrites. Also the dispersion energies of different pyrites are almost the same. But the acid-base interaction energy of the various pyrites is quite different. This probably might be attributed to the different origins of the pyrites. Comparison of the acid-base interaction energy with zeta-potential measurements shows a good correlation between the minimum in the acid-base interaction energy and the pH_(pzc).
机译：在浮选过程中，溶液的pH值在控制煤和黄铁矿的表面性质中起着重要作用。在目前的研究中，已经研究了pH对来自煤和矿石来源的黄铁矿表面自由能的影响。固体的表面自由能由两部分组成，即分散表面自由能和酸碱相互作用能。其他研究人员已使用各种方法来评估煤和其他固体的这两种成分。但是在本研究中使用了一种新方法来评估不同黄铁矿的表面自由能的两个分量。结果表明，不同黄铁矿的分散自由能与溶液pH无关，而酸碱相互作用能与溶液pH强烈相关。黄铁矿的酸碱相互作用能随pH的变化比黄铁矿更显着。同样，不同黄铁矿的分散能几乎相同。但是各种黄铁矿的酸碱相互作用能却大不相同。这可能归因于黄铁矿的不同起源。酸碱相互作用能与zeta电位测量结果的比较表明，酸碱相互作用能的最小值与pH_（pzc）之间具有良好的相关性。

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