关键词: 大颗粒立环脉动高梯度磁选机, 铁矿, 预先抛尾, 选矿效率

Abstract: Traditional vertical ring high gradient magnetic separator（VPHGMS） is used only for processing of fine grained minerals. In order to adapt to the actual production needs， coarse particle VPHGMS was developed for direct separation of coarse particle and the equipment was applied for pre-discarding of the tailings， which greatly reduces the production loading for the following operation. Aiming at the ore properties of Zhouyoufang Iron Mine in Anhui Province， two SLon-3500 coarse particle VPHGMS have been successfully applied in the technological transformation. Under the conditions of the feeding particle size of -4 mm， the magnetic induction intensity of twice roughing separation of 0.7 and 1.0 T respectively and the diameter of rod medium of 5 mm， a good discarding indexes has been obtained. At the same time， a large amount of waste rock generated by pre-discarding is sold to the construction sand industry， which created considerable economic， social and environmental benefits. A coarse concentrate with a TFe grade of 62.11% and a TFe recovery rate of 96.37% was obtained by applying a coarse particle VPHGMS to a high quality hematite concentrator in India under the conditions of feeding particle size of -5 mm， the magnetic induction intensity of twice roughing separation of 0.8 and 1.1 T respectively and rod medium diameter of 6 mm， indicating the better indexes.

Key words: coarse particle VPHGMS, iron ore, pre-discarding tailings, beneficiation efficiency