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于1977年投产的法布里卡矿选矿厂,使用九台磁极间隙为1.5mm 的标准DP317型琼斯湿式强磁磁选机,生产球团料精矿。这些装置以110t/h 的给矿速度并排作业。给矿中约含有47%的铁,磁铁矿的含量最大仅为0.8%。磁选机的场强约为1.2T。从1986年起,这个矿开始对其生产设施进行改造,使其适用于开采和处理更多低品位的铁英岩,以使现有的铁矿储存量获得最大限度的利用。磁选机给矿中磁铁矿的含量已增大到3%,结果导致了生产率的降低,这是由于在为回收极细粒赤铁矿所需的高磁场强度条件下,磁选机产生部分堵塞所引起的。即使降低给矿速率和磁选机的磁场强度,也无法解决这个问题。采用 DP90琼斯磁选机进行了大量的半工业试验后,湿式强磁选工业生产车间的生产流程被改造,即利用现有九台琼斯磁选机的两段分选流程。第一段的四台磁选机的磁极间隙增加到35mm,相当于0.7T 的最大场强。第一段“中磁场粗选”后是真正的强磁磁选段,第二段磁选采用的五台磁选机保持了原有的1.5mm 的磁极间隙,最大磁场强度为1.0T。第一段给矿最大可达到320t/h。第二段可达到240t/h。法布里卡矿选厂的设计原理将利用新老流程图来描述,本文还将介绍半工业试验的详细情况和生产厂新流程实际生产的性能数据。
The Fabrizi Ore Concentrator, put into operation in 1977, uses a standard DP317 Jones wet ferromagnetic separator with a pole gap of 1.5 mm to produce pellet concentrate. These units work side by side at a feed rate of 110 t / h. The mine contains about 47% of iron, the maximum content of magnetite is only 0.8%. Field strength magnetic separator is about 1.2T. Beginning in 1986, the mine began to revamp its production facilities to make it suitable for mining and processing more low-grade ferrihydrite in order to maximize the use of existing iron ore reserves. Magnetizers have increased the content of magnetite in the ore to 3%, resulting in a decrease in productivity due to the magnetic separator being produced at high magnetic field strength required to recover very fine hematite Caused by partial blockage. Even reducing the feed rate and magnetic field strength of the magnetic separator can not solve this problem. After extensive semi-industrial tests with the DP90 Jones Magnetic Separator, the production process for the wet-intensive magnetic separation plant was modified to utilize the two-stage separation process of the existing nine-stage Jones magnetic separator. The first paragraph of the four magnetic separator pole gap increased to 35mm, equivalent to 0.7T maximum field strength. The first paragraph of “magnetic field roughing” after the real strong magnetic Segment, the second paragraph of magnetic Separation using five magnetic separator to maintain the original 1.5mm pole gap, the maximum magnetic field strength of 1.0T. The first paragraph to the mine up to 320t / h. The second paragraph can reach 240t / h. The design principles of Fabry’s ore beneficiation plant will be described using new and old flowcharts. This article will also detail the details of the semi-industrial tests and the actual production performance data of new plant processes.