黄铁矿的半导体性质与可浮性的关系

来源期刊：中南大学学报(自然科学版)1988年第1期

论文作者：凌竞宏 胡熙庚

文章页码：10 - 17

关键词：黄铁矿； 浮游性； 半导体化学； 半导体物理； 电化学动力学； 温差； 电动势； 表面态； 数学模型； 影响因素； 调整剂

Key words：Pyrite； floatability； semiconductor chemistry； semiconductor physics； electrochemical kinetics； thermoelectricity； electromotive forces； surface states； mathematical models； influencing factors； modifier

摘    要：作者对产自三个不同类型矿床的黄铁矿在某些调整剂作用条件下的浮选行为作试验;并对黄铁矿的半导体性质与可浮性的关系进行了探讨。充氮气的单泡浮选试验结果表明,在适当的丁黄药浓度下及在NaOH,CaO,FeSO₄,Na₂SO₃和CuSO₄等为调整剂的条件下,黄铁矿的可浮性与半导体性质有密切关系。在抑制条件下,温差电动势率绝对值较大的p型黄铁矿比n型黄铁矿较难抑制。在活化条件下,温差电动势率绝对值较小的n型黄铁矿可浮性最好。上述试验及其结果已在中南矿冶学院学报1982年第4期发表。在本文中,作者提出了一个半导性影响矿物表面形成双黄药的电化学过程动力学的模型,利用这一模型,各种黄铁矿可浮性的差异可得到较好的解释。

Abstract: This paper deals with the flotation behavior of pyrites from three different types of mineral deposits in the presence of different modifiers and an investigation of the effect of the semi-conductivity on the flotability of pyrite. From the results of flotation experiments with the Hallimond tube and nitrogen- ated techniques, it is shown that under the conditions of suitable concentration of butyl xanthate and with NaOH, CaO, FeSO₄, FeCl₃, Na₂SO₃, and CuSO₄ as modi- fiers, the flotabilities of pyrites are closely related to their semi-conductivities, i. e. under the depression conditions, the mineral particles with p-type semi-conductivity and greater absolute value of thermoelectric power are more difficult to depress than those with n-type conductivity but under the activation conditions, the mineral par- ticles with n-type semi-conductivity and less absolute value of thermoelectric power have the best flotabilities. The above-mentioned experiments and the experimental results were issued in J. of CSIMM, №.4, 1982. In this work, a simple working model is established, in terms of which differences in the flotation properties may be well illustrated by the influence of their semi-conductivities on the kinetics of the electrochemical processes of the formation of dixanthogen on the pyite surface or on the anionic xanthate adsorption.