Study On The Influence Of New Organic Depressants On The Flotation Behavior Of Rhodochrosite And Silicon-containing Mineral

This paper takes manganese carbonate ore in northern Guizhou as the research object.The gangue minerals of this ore are mainly calcium carbonate minerals and siliceous minerals,of which the main siliceous minerals are clay minerals and quartz.The existence of clay minerals is the bottleneck of efficient utilization of mineral resources.Therefore,the impact of illite and quartz on the flotation behavior of rhodochrosite is emphatically studied.In the flotation separation process of manganese carbonate ore,illite is easy to adhere to cover the surface of other minerals,and at the same time,the inevitable ions in the pulp are adsorbed to make the mineral surface properties converge,leading to the difficulty of efficient separation of rhodochrosite.The selection of new inhibitors with strong dispersion and high selectivity is the main means to realize the effective separation of rhodochrosite from gangue minerals.Taking rhodochrosite,illite and quartz as the research objects,the influence of a new organic inhibitor GMY-02 and organic phosphonic acid on the flotation behavior of three minerals was investigated.In the optimized flotation reagent system,the influence of the interaction between ions and minerals on the activation or inhibition rules of minerals is explored,and the relevant mechanism of action is revealed.In the sodium oleate capture system,after adding GMY-02,the recovery rate of rhodochrosite is kept above 93%in the p H range of 8～10,and the flotation difference of the three minerals is significant;After GMY-02 and organic phosphonic acid were used together,rhodochrosite was weakly activated,and the recovery rate increased to about 95%in the p H range of 8～9,while the recovery rates of illite and quartz decreased to 1.21%and 1.58%,respectively.The flotation difference of the three minerals was further enhanced.The difference of recovery rate between rhodochrosite and silicon bearing minerals is about 93%.After adding Ca²⁺,Mg²⁺,Fe²⁺,the difference of floatability between rhodochrosite and silicon bearing minerals decreases;The addition of Mn²⁺increased the recovery rate of rhodochrosite by 1.61%,but the recovery rate of quartz increased to about 33%,and the recovery difference decreased to about 63%;After adding Fe³⁺and Al³⁺,the recovery of rhodochrosite decreased by 23.81%and 3.80%,respectively,and the floatability difference of the three minerals decreased.Therefore,it is inevitable that ions have a significant effect on the floatability of rhodochrosite,illite and quartz in the following order:Ca²⁺>Al³⁺>Fe²⁺>Mn²⁺>Fe³⁺>Mg²⁺.The results of mineral surface analysis show that GMY-02 has no obvious adsorption on the surface of rhodochrosite;The-OH in GMY-02 complexed with Al³⁺on the surface of illite,and the binding energy shifted significantly,reducing the active point on the illite interface;At the same time,the silanol group on the surface of quartz also has hydrogen bonding with-OH in GMY-02,and its binding energy also shifts.GMY-02 can selectively inhibit illite and quartz,and chemical adsorption occurs on the surface of illite,while physical adsorption mainly occurs with quartz.In alkaline solution,the interaction energy between rhodochrosite particles is mainly hydrophobic attraction,and illite and quartz are mainly electrostatic repulsion,which proves the experimental phenomenon that rhodochrosite agglomerates during flotation,while illite and quartz can disperse well.