关键词: 黄铁矿, 浮选, 成因类型, 晶面择优取向, 铁硫比, 可浮性差异

Abstract: Aiming at high sulfur epithermal pyrite (HSEP) and porphyry pyrite (PP) in the middle and upper ore zone of a deposit in Serbia,the surface characteristics and floatability were studied by X-ray diffraction,pure mineral flotation test, contact angle measurement,Zeta potential test and infrared spectrum test. The results showed that the Fe / S ratio of HSEP and PP are 0. 49 and 0. 47,respectively. HSEP grows with the preferred orientation of (210) and (211) crystal faces,while PP grows with the preferred orientation of (220) and (311) crystal faces. The natural floatability of HSEP is better than that of PP. With the increase of pulp pH value,the floatability of HSEP and PP gradually decreases,and the difference between them gradually decreases. The sensitivity of PP was higher when the dosage of butyl xanthoxanthate was low,and there was no significant difference in floatability between the two pyrites with the increase of dosage. The floatability of HSEP was better than that of PP when ammonium butylated black was used as collector,and the floatability difference of the two pyrites was increased under different pH conditions. PP is more easily inhibited by starch,while when lime is used to inhibit pyrite,the difference of flotability between the two pyrite gradually decreases with the increase of pH value. When pH is of 12,there is no significant difference in flotability between the two pyrites and they are completely inhibited. Under different copper sulfate dosage and pulp pH value,the floatability of the two kinds of pyrite is obviously different. Increasing the amount of collector and sulfuric acid has better effect on HSEP activation.

Key words: pyrite,flotation,genetic type,crystal orientation,iron sulfur ratio,floatability difference