| This project comes from the sub-project of the open subject fund project of the key laboratory of "Evaluation and comprehensive utilization of polymetallic ores" of the Ministry of Land and Resources,"Research on flotation separation mechanism and molecular design of agents for the associated minerals of polymetallic ores".The main task of this sub-project is the research and development of a new flotation reagent and its mechanism in the flotation separation process of fluorite and barite.In the fluorite ore associated with barite,it is difficult to separate the fluorite and barite effectively because they have similar surface chemical characteristics and similar floating characteristics,resulting in low utilization efficiency of this kind of fluorite mineral resources.In order to meet the requirements of efficient recovery of barite associated fluorite mineral resources,this paper focuses on the application and mechanism of new reagents in flotation separation of fluorite and barite,in order to achieve efficient separation of fluorite and barite and gangue minerals.In this paper,three new collectors,DSY-A,DSY-B and DSY-C,were developed by selecting the main minerals fluorite,barite and calcite contained in the ore as the research object,in order to understand the flotation characteristics of the three minerals under the three new reagent systems.The effects of metal ions Fe3+,Al3+,Mg2+,Ca2+,Pb2+and inorganic compounds Na2SO4,NaF,Na2CO3 on the flotation behavior of the three minerals were studied under the optimal collector DSY-A system.The experimental results show that the amphoteric chelating collectors DSY-A,DSY-B and DSY-C have good collecting effect on fluorite,barite and calcite,and can obtain high flotation recovery when the flotation temperature is above 18℃.The order of the mineral collecting ability from strong to weak is DSY-A>DSY-B>DSY-C.In the DSY-A system,when the pH value is 8～11,DSY-A has similar harvesting ability for the three minerals,and it is difficult to separate them without inhibitor.In the DSY-B system,the floating difference between fluorite and barite is 51.2%when pH is 4.When pH value is 6,the difference between calcite and fluorite is 24.3%.In the DSY-C system,the floating difference between fluorite and barite and calcite is very small in the pH range of 8.5～9.When the pH is 11.5,the floating difference between fluorite and barite is 32.6%.Under the DSY-A system,seven kinds of adjustment agents have little effect on the flotation recovery of the three minerals.It is indicated that DSY-A collector is an insensitive low temperature collector with strong adaptability to environment.The flotation test results of fluorite-calcite binary artificial mixed ore show that when DY-1 is added,the fluorite grade in the flotation foam products increases to 92.29%.and the fluorite recovery is 80.3%.The flotation test results of fluorite-barite-calcite ternary artificial mixed ore show that the grade of fluorite increases to 62.75%and the recovery rate decreases to 85.33%after the addition of DY-1.After the addition of DY-2,the grade of fluorite is 68.02%,the recovery is 78.0%,and the separation effect is good.The adsorption mechanism of three minerals with DSY series collector was studied by means of Zeta potential,infrared spectrum,contact Angle and MS simulation.The results show that the adsorption mechanism of DSY-A,DSY-B and DSY-C with the three minerals is mainly due to ionic bonding,hydrogen bonding coupling and electrostatic adsorption.In addition to C=O,C-O and NH2 polar groups,DSY-C also contains C-O-C ether bond on the carbon chain,which is far away from the polar group is not the adsorption active site,but plays a role in increasing hydrophilic dispersion.Both sodium silicate and sodium hetaphosphate have a large number of minerophilic groups Si=O,Si-O-,P=O,P-O-,they are also hydrophilic groups,Si and P is structural atoms,do not participate in adsorption,the real effect is=O,and-O-.The larger the molecular association scale of the inhibitor,the more hydrophilic groups=O,and-O-,the better the inhibition effect.The contact Angle test results show that the compound inhibitor DY-2 has stronger hydrophilicity with minerals than the modified sodium silicate inhibitor DY-1,which corresponds to the flotation test results to a certain extent. |
