Flotation Separation And Mechanism Of Rhodochroite From Calcium-magnesium Carbonate Minerals Under Gemini System

Under the leadership of the teacher,the flotation separation of rhodochrosite,calcite and magnesite has always been one of the difficulties encountered in the flotation and separation of manganese ore.In the previous research,there were many reports on the inhibitor in the sodium oleate system,but the flotation separation of the three could not be achieved.Therefore,the search for collectors with strong selectivity is the main idea to realize the flotation separation of the three minerals.In this paper,the flotation separation of rhodochrosite and calcium-magnesium carbonate minerals under the new Gemini surfactant system was explored through flotation separation experiments of single mineral and mixed ore.By means of analysis and XPS analysis,the adsorption forms of different flotation agents on the surface of rhodochrosite,calcite and magnesite were explored,which laid a theoretical foundation for the flotation separation of rhodochrosite and calcium-magnesium carbonate minerals.In pure mineral flotation experiments,BDDA was found to have excellent selectivity for rhodochrosite by comparing Gemini surfactant（BDDA）with conventional collectors（sodium oleate and dodecylamine）.In the BDDA system,the inhibitor water glass,sodium hexametaphosphate,sodium lignosulfonate and chitosan all have weak inhibitory effects on the target minerals,and sodium hexametaphosphate and water glass have a slight activation of rhodochrosite However,the inhibitory effect on calcium and magnesium carbonate minerals is stronger.At the same time,the influence of several metal ions on mineral flotation behavior under BDDA system was investigated.In the artificial mixed ore flotation experiment,in the mixed separation of rhodochrosite and calcite,adding 2×10^-4mol/L BDDA can obtain rhodochrosite with Mn grade of 24.08%and recovery rate of 75%.In the mixed separation of rhodochrosite and magnesite,the addition of sodium lignosulfonate can not only obtain rhodochrosite concentrate with Mn grade of 26.79%and recovery rate of 93%.In the flotation separation of rhodochrosite,calcite and magnesite,when the dosage of BDDA is 2×10^-4mol/L,the Mn grade can be increased from 15.90%to17.88%,and the recovery rate of rhodochrosite is 85.09%..It can be seen that BDDA is a promising collector in rhodochrosite flotation.The flotation solution chemistry,Zeta potential,infrared spectroscopy and XPS analysis showed that BDDA and the three minerals belonged to the physical electrostatic interaction.The selectivity of BDDA to the three minerals is due to the presence of components such as Mn（OH）₃^-and Mn（OH）₄^2-in the solution of rhodochrosite under alkaline conditions,which increases the electrostatic adsorption of BDDA on the surface of rhodochrosite.The active site of rhodochrosite is better than that of calcite and magnesite.Sodium lignosulfonate is adsorbed on the surface of rhodochrosite and magnesite through chemical bonding,and has a strong inhibitory effect on magnesite.The addition of water glass and sodium hexametaphosphate has little effect on the adsorption of BDDA on the surface of rhodochrosite,and has a slight activation effect.