Study On Column-machine Combined Flotation Of Baiyun Ebo Rare Earth Ore

Rare earth element is known as "industrial vitamin".Baiyun Ebo rare earth mine is the world's largest mineral-type rare earth polymetallic symbiotic deposit.It has great strategic value.For many years,due to its extremely complex ore properties,and the close symbiosis between various minerals,embedding The granularity of the cloth is fine and the sorting is difficult.The average content of rare earth oxides in Baiyun Ebo iron ore of Baosteel is more than 5%,and the current recovery rate of rare earth resources in the concentrator is less than 10%.A large number of rare earth minerals are stored in the tailings pond along with the tailings pile of the concentrator.More than 70% of the total resources of tailings resources.From the perspective of improving the efficiency and utilization of rare earth resources,it is promising to strengthen flotation reagents and develop new flotation processes.In view of the poor selectivity of inhibitors present in rare earth beneficiation,old flotation equipment and processes,and low grade of rare earth concentrates,the process of chemical intensification and machine-column combined flotation has made up for the conventional fine flotation machine in fine-grained rare earth The lack of difficult recovery of ores(especially below 10 ?m)has strengthened the efficient recovery of fine-grained rare earth ores.In this paper,the Baiyun Ebo rare earth mine is taken as the research object.The experimental study found that the inhibitor water glass can not effectively inhibit the calcareous gangue minerals and analyzed the mechanism,and explored the combination of various inhibitors and water glass to strengthen the rare earth flotation The experimental research results show that the combined suppression of sodium polyacrylate and water glass has obvious advantages over the single water glass suppression in the rare earth floatation of Baiyun Ebo tailings.The single water glass suppression open circuit flotation test requires four selections to obtain a grade of 57.17%,The rare earth concentrate with a recovery rate of 55.74%,the open circuit test of combination medicine only needs three times to obtain the rare earth concentrate with a rare earth grade of 60.34%,and the recovery rate is 58.57%.On the premise of shortening the test process,the rare earth concentrate is achieved The grade is increased by 3.17%,and the recovery rate is increased by 2.83% of the flotation index.By analyzing the flow field characteristics of the flotation machine and the flotation column,it is found that the separation environment provided by the flotation machine is more suitable for coarse-grained mineral flotation,and the separation environment provided by the KYZ-E type flotation column is more suitable for fine-grained minerals.Flotation,particle size effect is the key to restrict the flotation machine for efficient recovery of fine-grained rare earth ore.Two different flotation methods,KYZ-E flotation column and conventional flotation machine,were tested for the conditions of concentration,particle size,inhibitor dosage,collector dosage,and aeration.On this basis,a single flotation was conducted.Experimental research on the open circuit process of flotation machine and combined machine-column flotation.The research results show that the combined flotation process of machine-column has obvious advantages over the flotation of a single flotation machine.The rare earth concentrate with a recovery rate of 63.84% and a recovery rate of 62.42% not only shortened the process,but also increased the grade of the rare earth concentrate by 3.49% and the recovery rate by 12.36%,which provided an efficient use of rare earth resources in Baiyun Ebo tailings Technical basis.