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研究了芬兰Kemi选矿厂重选回路的“矿泥”中的铬铁矿的浮选。主要脉石矿物有绿泥石、透闪石和滑石。这类矿石的捕收剂一般为胺和脂肪酸。从理论上讲,由于铬铁矿的表面电荷与脉石矿物相反,可以期待得到良好的选择性。主要成分的电动电位是pH的函数。结果表明选择性浮选发生在pH小于3。此时钛铁矿带正电,其他矿物带负电,因而适于使用阴离子捕收剂。表面带负电的铬铁矿无选择性,使用胺捕收剂除外。浮选试验采用二种工业用脂肪酸捕收剂,即F2874和AC825。二者都适用于低pH。开路试验中,使用F2874得到铬铁矿含量约为95%的精矿,回收率70%。发现浮选适宜于回收高格铁比的铬铁矿颗粒。试验揭示了可逆的吸附一解吸现象以及铬铁矿表面电荷和选择性之间的特定关系。证实了低pH时脂肪酸在铬铁矿上的吸附为物理吸附的假设。
Studied the flotation of chromite in “Mud” of the re-selection circuit in Kemi, Finland. The main gangue minerals are chlorites, tremolite and talc. Collectors of this type of ore are generally amines and fatty acids. In theory, good selectivity can be expected due to the fact that chromite has the opposite surface charges from gangue minerals. The main component of the electromotive potential is a function of pH. The results show that selective flotation occurs at pH less than 3. In this case, the ilmenite belt is positively charged and other minerals are negatively charged, making it suitable for the use of anion collectors. Negatively charged chromite on the surface is non-selective, with the exception of amine collectors. Flotation test using two kinds of industrial fatty acid collector, namely F2874 and AC825. Both are suitable for low pH. In the open circuit test, F2874 was used to obtain concentrates with a chromite content of about 95% with a recovery of 70%. Flotation was found to be suitable for the recovery of chromite particles of high lattice iron ratio. Experiments revealed reversible adsorption-desorption phenomena as well as the specific relationship between chromic surface charges and selectivities. The hypothesis that the adsorption of fatty acids on the chromite at low pH is physical adsorption is confirmed.