摘要
采用活化浮选、热力学计算、交流阻抗等技术考察硫酸和草酸对被石灰抑制后的黄铁矿的活化效果和活化机理。单矿物浮选试验证实硫酸与草酸均能活化黄铁矿,草酸的活化效果优于硫酸的活化效果。热力学计算以及交流阻抗表明硫酸与草酸对黄铁矿的活化机理有2方面:一是提高其表面自身氧化电位,阻碍亲水物质进一步产生;二是去除吸附在黄铁矿表面的亲水物质,使之露出新鲜表面,表现为黄铁矿表面电阻Rs随着硫酸和草酸浓度增加而降低,表面法拉第反应电阻RP随着硫酸和草酸浓度增加而增大。
Activated flotation,thermodynamic calculation and alternating current impedance were adopted to explore the activative flotation effects and mechanisms of sulphuric acid and oxalic acid for pyrite depressed by lime. The results of experiments show that both sulphuric acid and oxalic acid can activate pyrite and the activated effect of oxalic acid is better than that of sulphuric acid. The studies using thermodynamic calculation and alternating current impedance indicate that the activative mechanisms of sulphuric acid and oxalic acid have two facts. One is to elevate the own surface potential which results in preventing to produce hydrophile further,the other is to wipe off hydropile from the surface of pyrite in order to reveal the fresh surface of pyrite. Surface resistance Rs of pyrite surface decreases with the increase of the dosage of sulphuric acid and oxalic acid. Faraday resistance Rp increases with the increase of the dosage of sulphuric acid and oxalic acid. The results are consistent with those of flotation experiments.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第3期813-818,共6页
Journal of Central South University:Science and Technology
基金
国家"十一五"科技攻关项目(2006BA02A06)
关键词
黄铁矿
碱
钙
活化浮选
pyrite
alkali
calcium
activated flotation
