Study on the Process of Rolling and Pre-Selection Discarding before Grinding of a Specularite Ore in Anhui
The main useful component of a low-sulfur phosphate specularite ore in Anhui is Fe,and the main gangue component is SiO2.The iron in the form of specularite accounts for 96.11%of the total iron.The iron minerals are densely,moderately dense,sparse-scattered different intensive degrees disseminated banded distribution,and partial dissociation is easier.In order to solve the problem of excessive consumption of tailings storage capacity caused by excessive production of fine tailings and reduce the production cost of mineral processing,the feasibility study of high pressure roller mill closed circuit rolling-high intensity mag-netic separation discarding of the original ore before grinding was carried out.The results show that the waste rock with yield of 22.33%can be discarded by the vertical ring pulsating high gradient magnetic separator two roughing discarding,and the pre-selection rough concentrate with iron grade of 42.99%and iron recov-ery of 96.03%can be obtained.The coarse particles(+0.3 mm)separated from the pre-selected tailings can be sold as construction sand.Before the original grinding,the high pressure roller mill closed circuit rolling-vertical ring pulsating high gradient magnetic separator wet coarse grained pre-selection and discarding-waste rock selection sand process is added,which can not only significantly reduce the amount of grinding,reduce the particle size of grinding,improve the grade of grinding,and reduce the production of fine-grained tailings,but also obtain a large amount of construction sand and increase the economic benefits of en-terprises.
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