Test on Wet Pre-Selection Discarding Tailings Process of a Magnetite Ore before Grinding
In order to reduce the amount of ore into grinding and improve the grade of iron into grind-ing,a concentrator in Hubei Province adopts the pre-screening-highpressure roller mill-check screening-wet coarsegrained magnetic separation pre-concentration process to discard the tailings,and the pre-con-centration concentrate is separated by stage grinding-stage magnetic separation-elutriation process.The test results show that when the sample is finely crushed to-3 mm,the tailings discardingyield is 31.41%,the to-tal iron grade of the pre-concentration tailings is 7.31%,the magnetic iron grade is 0.67%,the total iron grade of the pre-concentration concentrate is 52.46%,the magnetic iron grade is 49.28%,and the magnetic iron recovery rate is 99.38%.When the final grinding fineness is-0.074 mm 90%,the iron concentrate with total iron grade of 68.12%,sulfur grade of 0.265% and total iron recovery of 85.76% can be obtained.The process reduces the circulating load of the high-pressure roller mill,and the tailings discarding effect is ob-vious,and a better iron concentrate index is obtained.
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