论文部分内容阅读
法布里卡（Fabrica）矿选矿厂于1977年投产，当时采用9台DP317标准型琼斯（Jones）湿式强磁场磁选机，其间隙宽度为1．5mm，生产球团精矿。这9台磁选机平行作业，给矿速率为110t／h，给矿铁品位约为47％，磁铁矿含量最高只有0．8％。磁场强度约为1．2T。矿山从1986年起开始改革它的生产条件，以便开采和选别大量低品位铁英岩，最有效地利用可采铁矿资源．磁选机给矿中磁铁矿含量增加到3％，其分选能力下降，这是由于在高场强下，分选箱发生部分堵塞，而高场强又是回收极细粒赤铁矿所必需的，即使降低给矿速率和场强也无济于事。利用DP90型琼斯磁选机在半工业厂经过深入试验后，工业生产的湿式强磁场磁选改造为二段分选，但仍采用原有的9台磁选机。第一段分选用4台磁选机，其间隙宽度增大到3．smm，相当于最大磁场强度0．7T．第一段是中等强度粗分选阶段，其后是第二段，即真正的强磁场湿式磁选，采用5台磁选机，按原来配置，间隙宽度为互．smm，最大磁场强度为1．OT。第一段的给矿速率可达320t几，第二段可达240t巾．本文叙述了法布里卡矿选矿厂新、老流程的设计原理，详细介绍了半工业试验和新厂的实际生产数据。
The Fabrica ore processing plant was put into operation in 1977 when nine DP317 Jones wet magnetic field separators were used with a gap width of 1.5 mm to produce pellet concentrate. The nine magnetic separator parallel operations, to the ore rate of 110t / h, to the grade of about 47% of iron ore, magnetite content of only 0.8%. Magnetic field strength is about 1.2T. Since 1986, the mine began to reform its production conditions in order to mine and select a large number of low grade ferrihydrite and make the most efficient use of recoverable iron resources. Magnetic separator to the mine to increase the content of magnetite to 3%, its sorting ability decreased, which is due to the high field strength, the partial selection box to block, and high field strength is the recovery of very fine hematite Necessary, even if to reduce the rate of ore and field strength will not help. With the DP90 Jones magnetic separator in the semi-industrial plant after in-depth testing, the industrial production of wet magnetic field magnetic separation transformation for the two-stage sorting, but still use the original nine magnetic separator. The first paragraph sorting with 4 magnetic separator, the gap width increased to 3. smm, equivalent to a maximum magnetic field strength of 0.7T. The first section is the middle strength coarse sorting stage, followed by the second paragraph, that is, the real magnetic field wet magnetic separation, using 5 sets of magnetic separator, according to the original configuration, the gap width of each other. smm, the maximum magnetic field strength of 1. OT. The first paragraph of mine rate up to 320t, the second paragraph up to 240t towel. This article describes the design principles for the new and old processes in the Fabrika ore dressing plant, details the semi-industrial tests and the actual production data for the new plant.