Study On Flotation Behavior And Mechanism Of Carbonate Mineral

The main gangue minerals in Qianbei manganese ore are quartz,clay minerals and carbonate minerals,among which rhodochrosite and gangue carbonate minerals（dolomite,calcite and magnesite）exist in a co-associated form,and metal ions and Mn²⁺in gangue carbonate minerals produce competitive deposition in the electrolysis process,resulting in a decrease in the electrolysis rate in the tank.Therefore,the effect of polymer inhibitors on the flotation behavior of rhodochrosite and gangue carbonate minerals was investigated,and the mechanism of action at the interface between polymer inhibitors and minerals was characterized.When the slurry pH=10 and the amount of collector is 60mg/L,the combination of fine tall oil:sodium oleate=4:1 can enhance the flotability of rhodochrosite with a recovery rate greater than 90%,and the floatability of gangue carbonate minerals is also greatly improved,and the recovery rate is higher than that of rhodochrosite manganese,and the floatability of the four minerals is consistent,the separation of rhodochrosite and ganganite carbonate minerals cannot be realized.In order to increase the difference in the floatability of rhodochrosite and gangue carbonate minerals,the polymer inhibitor GMY-01 was added to the above capture system,and the recovery rate of rhodochrosite and calcite was as high as74.46%,while magnesite and dolomite were completely suppressed,which provided support for the effective separation of rhodochrosite and gangue carbonate minerals.In the optimized flotation system,the inevitable ions Mn²⁺,Ca²⁺,Mg²⁺were added to a certain extent,and the four minerals were inhibited to a certain extent,among which the influence of Mg²⁺was particularly significant,followed by Ca²⁺,and the influence of Mn²⁺was minimal,and the presence of inevitable ions reduced the difference in the floatability of rhodochrosite and gangue carbonate minerals.The results of FTIR analysis showed that GMY-01 interacted with Ca²⁺and Mg²⁺at the mineral interface,which reduced the surface active site of gangue carbonate minerals,thereby inhibiting the floatability of gangue carbonate minerals.The results of XPS analysis showed that-COO^-Ca²⁺in calcite,Mg²⁺in magnesite and Ca²⁺and Mg²⁺in dolomite all had strong chemical effects,and the adsorption of-COO^-and Mg²⁺was stronger than that of Ca²⁺and-COO^-.The results of molecular simulation also proved that the functional group of GMY-01 adsorption energy on the surface of carbonate minerals:magnesite>dolomite>calcite>rhodochrosite.Under the action of GMY-01,the analysis of Zeta potential and contact angle showed that the mineral surface adsorbed the collector strongly:rhodochrosite>calcite>magnesite>dolomite,and also proved that the addition of inevitable ions weakened the adsorption capacity of the collector on the surface of four minerals.The above characterization results are consistent with the flotation behavior of four carbonate minerals in the optimized flotation system.