Design, Synthesis And Flotation Mechanism Study On Flotation Reagents For Silver Containining Lead-zinc Ore

To realize comprehensive utilization of silver containing lead-zinc ore, deposit and occurrence statewas determined by the study of process mineralogy. The relationship between electronic structre and theflotability was explained by using DFT theory, some new mercaptobenzo flotation reagents were designed,and three of them (EMBI, PMBI and BMBI) which have higher theory collectivity were synthesized on thebasis of quantum calculation. The flotation behavior of new collectors on the single mineral (galena,sphalerite and pyrite) and artificial mixed mineral was tested by flotation and separation performance. Theselectivity of new collectors on metal ions as well as well as stoichiometric and binding constant with Ag+was determined by UV-Vis analysis. The adsorption mechanism of collectors on the mineral was explainedby adsorption capacity, FT-IR analysis and molecular dynamics simulation modeling.The results show that galena and sphalerite are the main carrier minerals of silver, the distribution ofsilver particles is finer, and increasing the grinding fineness is helpful to improve the recovery of silver.Oxidized order as follows: galena>argentite>proustite>stephanite>freibergite>sphalerite; andinteraction ability with xanthate from easy to hard follows the order ofstephanite>argentite>freibergite> proustite>sphalerite and galena. By adjusting the pH value,galena or sphlerite can be separated from pyrite effectively by using the synthetic collectors, the collectingability follows the order BMBI>PMBI>EMBI. All of them have good selectivity on Ag+and the bindingconstant following the same order as collecting ability. Adsorption test, FT-IR analysis and moleculardynamics simulation show that these collectors adsorbed on the minerals through–SH,-NH and with metalions forming chelate four member ring, and the interaction energy follows the order ofBMBI>PMBI>EMBI, the calculation results are identical with the experimental. All the results provide usgood guidance for designing collectors reasonablely.