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从南澳大利亚Olympic Dam铜-铀-金矿床矿石中选出的铜浮选精矿含有与铜硫化物、脉石矿物共生的铀。对矿化为辉铜矿、斑铜矿类型的铜精矿的研究结果表明,在30—60℃、24h、不加氧化剂的情况下,用硫酸(>40g/1)能溶解出94—97％的铀。精矿中铜随铀一起被浸出。当反应是在氮气或氩气条件下(即在缺氧的情况下)进行时,在前15min内有5—7％的铜被溶解,而此后实际上不再有更多的铜溶解。在空气和氧气条件下,反应超过24h,铜还继续溶解。铜起初的快速溶解与低辉铜矿氧化成roxbyite和表面氧化物的溶解有关。在空气和氧气条件下,roxby-ite和斑铜矿氧化成靛青兰色烟灰状铜兰与铀的进一步氧化有关。矿浆的氧化还原电位通过铜硫化物反应来控制。对于在氮气条件下的反应来说,系统的氧化还原电位是225—250mV(用饱和甘汞电极作参比),而在空气或氧气条件下,随着铜硫化物的逐步氧化,氧化还原电位逐渐上升到350mV(用饱和甘汞电极作参比)。这些结果以及Olympic Dam冶金中间工厂的研究结果表明,从Olmpic Dam矿床矿石中得到的铜浮选精矿中的铀能够选择性的被去除.
Copper flotation concentrates from the Olympic Dam copper-uranium-gold ore in South Australia contain uranium symbiotic with copper sulphides and gangue minerals. The results of the mineralization of chalcopyrite and cupro-copper concentrate show that when sulfuric acid (> 40g / l) can dissolve 94-97 at 30-60 ℃ for 24h without oxidizing agent, % Of uranium. Copper concentrate leached with uranium. When the reaction is carried out under nitrogen or argon conditions (ie in the absence of oxygen), 5-7% of the copper is dissolved in the first 15 min, after which virtually no more copper is dissolved. In air and oxygen conditions, the reaction over 24h, copper also continue to dissolve. The initial rapid dissolution of copper is associated with the dissolution of low chalcocides into roxbyite and the dissolution of surface oxides. Under air and oxygen conditions, roxby-ite and behenite oxidation to indigo-blue sooty copper flakes are associated with further oxidation of uranium. The redox potential of the slurry is controlled by the copper sulphide reaction. For the reaction under nitrogen conditions, the system redox potential is 225-250mV (with saturated calomel electrode as a reference), and in the air or oxygen conditions, with the gradual oxidation of copper sulphide, redox potential Gradually increased to 350mV (with saturated calomel electrode for reference). These results, as well as the findings of the Olympic Dam Metallurgical Intermediate Plant, show that uranium from copper flotation concentrate obtained from the Olmpic Dam ore can be selectively removed.