论文部分内容阅读
在镍黄铁矿浮选中,二亚乙基三胺(DETA)是含镍磁黄铁矿的一种选择性抑制剂。对矿石及生产样品进行的试验室浮选试验表明,添加少量的DETA,磁黄铁矿的丢弃量大大提高。然而,当矿样受到氧化时,该抑制剂的效果最为显著。对浮选产品和磁黄铁矿样品进行激光电离质谱仪(LIMS)和X射线光电子光谱仪(XPS)分析表明,由于生产用水中含有如Ni~(2+)、Cu~(2+)和Ag~+等重金属离子使矿物无意中受到活化,而导致磁黄铁矿丢弃作业的困难。然而,在DETA存在时,矿物在氧化条件下受到了钝化。钝化机理可能与活化产品的氧化继之以DETA的增溶溶解有关,这些活化产品很可能以重金属硫化物形式存在。与DETA接触过的磁黄铁矿电极的傅利叶变换红外(FTIR)光谱没有显示出矿物表面有药剂的丝毫痕迹,证明了DETA的作用是作为一种铬合剂的观点,在氧化条件下,铬合剂增强了活化产品的溶解。接触过戊基黄药溶液的磁黄铁矿FTIR光谱表明,双黄药和黄原酸铁二者都在矿物表面形成,在高电位下,后者更占优势。然而,在有DETA情况下,当电位(E_h)接近200mV比无DETA情况高时,仅仅有少量的黄药吸附在矿物表面上。
Diethylenetriamine (DETA) is a selective inhibitor of nickel pyrrhotite in nickel pyrite flotation. Laboratory flotation tests on ores and production samples showed that the addition of a small amount of DETA resulted in a significant increase in discarding of pyrrhotite. However, the effect of this inhibitor is most pronounced when the mineral sample is oxidized. The results of LIMS and XPS analysis of flotation products and pyrrhotite samples show that due to the presence of impurities such as Ni2 +, Cu2 + and Ag2 + in the production water, ~ + And other heavy metal ions make the mineral unintentionally activated, resulting in the difficulty of discarded pyrrhotic operations. However, minerals are passivated under oxidizing conditions in the presence of DETA. The mechanism of passivation may be related to the oxidation of activated products followed by the solubilization of DETA, most likely in the form of heavy metal sulphides. Fourier Transform Infrared (FTIR) spectroscopy of the pyrrhotic electrode contacted with DETA did not show the slightest trace of the drug on the surface of the mineral, proving the role of DETA as a chromium agent under oxidative conditions, Enhanced dissolution of activated product. FTIR spectroscopy of pyrrhotite exposed to pentyl xanthate solution showed that both xanthate and xanthate were formed on the mineral surface, with the latter at a higher potential being more dominant. However, with DETA, only a small amount of xanthate adsorbed onto the mineral surface when the potential (E_h) was near 200 mV higher than in the absence of DETA.