西藏特大型铜矿浮选体系对铜硫分离的影响研究

Study on the Influence of Flotation System on Copper-sulfur Separation of Super-large Copper Mine in Tibet

为了开发利用西藏巨龙特大型低品位铜钼矿,针对高硫型铜矿存在的铜硫分离难的问题,进行了浮选体系计算,获得了黄铜矿、黄铁矿在矿浆中的表面变化热力学形态,以及磨矿和矿物间的相互反应对矿物表面的影响,即浮选体系对铜硫分离的影响。研究得出:黄铜矿在中性或碱性条件下,表面氧化反应能有效提升其浮选行为;黄铁矿在碱性条件下难以有效地进行浮选;磨矿过程和硫化矿间的电化学接触均加速了黄铜矿表面的氧化过程,促进Cu^(2+)溶出,造成黄铜矿的抑制和黄铁矿的活化;石灰分段加入,能有效抑制矿浆中的电化学反应,减轻矿浆中Cu^(2+)、Fe^(2+)、Fe^(3+)对铜硫分离的影响。

In order to develop and utilize Julong super-large low-grade copper-molybdenum ore in Ti⁃bet,the flotation system calculation was carried out to solve the problem of difficult separation of copper and sulfur in high-sulfur copper ore.The thermodynamic morphology of surface changes of chalcopyrite and py⁃rite in pulp,as well as the influence of grinding and mineral interaction on mineral surface,namely the influ⁃ence of flotation system on copper-sulfur separation,was obtained.The results show that the surface oxida⁃tion reaction can effectively improve the flotation behavior of chalcopyrite under neutral or alkaline condi⁃tions.It is difficult to effectively float pyrite under alkaline conditions;both the grinding process and the elec⁃trochemical contact between sulfide minerals accelerated the oxidation process on the surface of chalcopyrite and promoted the dissolution of Cu^(2+),resulting in the inhibition of chalcopyrite and the activation of pyrite.The addition of lime can effectively inhibit the electrochemical reaction in the pulp and reduce the influence of Cu^(2+),Fe^(2+)and Fe^(3+)on the separation of copper and sulfur.