摘要
硫酸铵不仅对氧化铜矿的硫化－黄药浮选具有硫化促进作用，而且在氧化铜矿的直接浮选中具有活化作用。这种活化作用经历了从固相到液相再到固相的相转移活化过程。在“相转移活化”中，硫磺铵的主要作用表现为下列三个方面：（1）增溶作用，即硫酸铵能选择性地溶解孔雀石表面反应活性大的离子，溶解后的矿物表面易于吸附黄药；（2）传递作用，即所溶解的铜离子与硫酸铵结合成铜氨络离子，加入黄药后．铜氨络离子离解，将铜离子传递给黄原酸阴离子；（3）对黄药具有增强吸附作用，即硫酸铵的存在能增加黄药在矿物表面的吸附量，加快吸附过程，同时还阻止了黄原酸铜向溶液解吸．这三种作用构成了硫酸铵对孔雀石“相转移活化”的实质。
Ammonium sulfate can not only intensify sulfidization in sulfidized xanthate flotation of oxidized copper ores, but also activate oxidized copper ores in the direct flotation. In the activation, copper ions activating mineral go through the process from solid phase to liquid phse and then to solid phase, which called 'phase transferring and activating process'There are three main effects of ammonium sulfate in 'phase transferring and activating': (1) Dissolution of copper : ammonium sulfate can selectively dissolve the copper ions on the surface of malachite which activity is large, the mineral surface washed can easily adsorb xanthate after dissolution. (2)Tansmission: the copper ions dissolved with ammonium sulfate form copper ammonium complex ion and after xanthate is added, copperal ammonium complex ions ionize and the copper ions are transmitted to xanthate(X-). (3)Adsorption of xanthate: the existence of ammonium sulfate can intensify the adsorption of xanthate on the mineral surface, and qinken the adsorption process. At the same time, it can prevent copper-xanthate adsorbed on mineral surface go into the solution. These are the nature of the notation of malachite with 'phase transferring and activating process'.
出处
《有色金属》
CSCD
1999年第1期22-24,共3页
Nonferrous Metals
关键词
硫酸铵
相转移
活化
浮选
氧化铜矿
选矿
ammonium sulfate
phase transferring, activation
flotation
