Study On Mechanism Of The Action Of Inhibitor On Flotation Separation Of Chalcopyrite And Galena With ITC As A Collector

Flotation separation of sulfide copper-lead is an important research direction in the field of mineral processing. In recent years the study on chalcopyrite and galena flotation separation focused primarily on the development and use of high-efficient and low-toxic inhibitors to alleviate environmental pollution and improve separation efficiency. In this thesis, flotation separation behavior and mechanism of chalcopyrite and galena with inhibitor depressant in ITC system have been studied based on puer mineral flotation tests, adsorption measurements, solution chemistry of flotation, surface thermodynamic calculation and molecular dynamics simulation.Pure mineral flotation tests showed that in ITC system7×10-4mol/L ITC is thought to be the most reasonable dosage, optimum pH value is about9.5. Sodium pyrosulfite, sodium silicate, CMC and sodium sulfite have no effect on chalcopyrite flotation but on galena inhibitory action weakened in order. Inhibitory effect of two inhibitors used in combination is stronger than a single inhibitor, three inhibitors of sodium pyrosulfite, sodium silicate and CMC used in combination achieve the best inhibitory effect, this pharmaceutical combination named SSC.The adsorption test showed that the adsorption of ITC on chalcopyrite and galena increased firstly and reduced afterward with the increasing of pH value, the effect of Sodium pyrosulfite, sodium silicate, CMC on ITC adsorbed amount on the surface of chalcopyrite and galena weakened in order.Infrared absorption spectrometry of ITC interact on chalcopyrite and galena surface is undetectable, indicating that ITC may be a small amount of mineral surface adsorption or physical adsorption.Solution chemistry of flotation circumstantiate calculation showed that on mineral surface ITC molecular adsorption is major, namely, physical adsorption. In the alkaline environment of pH=9.5, as ITC collecting capacity to chalcopyrite is stronger than galena, hydroxyl and SiO(OH)3-in sodium silicate competitive adsorption with anionic collector ITC, led to galena flotation was inhibited. After CMC adsorb on galena surface moisture film formed, make galena more strongly inhibited. Surface thermodynamic calculation showed that the sulfite of galena produced hydrophilic salt, led to galena flotation was inhibited.Molecular dynamics simulation showed that in vacuo ITC had great catching ability for both chalcopyrite and galena. To galena sodium pyrosulfite, sodium silicate and CMC inhibiting ability decreases in turn.Fujian Jianyang low-grade copper-lead-zinc multi-metal sulfide ore, copper concentrate grade and recovery is16.61%and64.14%, lead concentrate grade and recovery is43.57%and79.54%, the use of combinatorial depressant, the separatoin of copper and lead was realized successfully.