Magnetic iron ore, iron ore and a plurality of weakly magnetic metal Ore sorting techniques:
(1) Magnetite ore dressing Mainly used to select low-grade “Anshan-style†magnetite. Due to the strong magnetic properties of the ore and good grinding, the domestic magnetic separation plant adopts stage grinding and multi-stage grinding process. For the coarse-grained magnetite, the former (a section of grinding), fine-grained and fine-grained inlays are used. The magnetite uses the latter (two or three stages of grinding). The series of permanent magnetization developed by China has made the magnetic separator realize permanent magnetization. After the 1970s, due to the promotion of fine screening and re-grinding technology in the national magnetite ore dressing plant, the concentrate grade was increased from 62% to 66%, achieving the requirement of the Metallurgical Industry Department to reach 65% of the concentrate grade.
(2) Weak magnetic iron ore beneficiation is mainly used to select hematite, limonite, mirror iron ore, siderite, imaginary hematite or mixed ore, also known as "red mine". This type of ore has a low grade, a fine grain size, a complex mineral composition, and difficulty in sorting. After the 1980s, the beneficiation technology has continuously improved the research on the process, equipment and new varieties of roasting magnetic separation, wet magnetic separation, weak magnetic flotation and re-election, so that the concentrate grade and metal recovery rate are continuously improved. For example, the Qishanshan Concentrator of Anshan Iron and Steel Co., Ltd. has adopted a new process of weak magnetic-strong magnetic-flotation, which has achieved encouraging results.
(3) Multi-metal co-ordination ore dressing This type of ore is complex and diverse in type, so the methods, equipment and processes used are also different. For example, the Bayan Obo iron ore uses reverse flotation - multi-gradient magnetic separation, flocculation Flotation, weak magnetic-reverse flotation-strong magnetic separation, weak magnetic-positive flotation, roasting magnetic separation and other different processes to improve the recovery of iron and comprehensive recovery of rare earth oxides. The Panzhihua Iron Mine obtained about 53% of the ferro- vanadium concentrate of TFe by magnetic separation. The tailings after magnetic separation were obtained by weak magnetic sweep-strong magnetic separation-re-election-flotation-drying to obtain titanium concentrate and sulphur- cobalt concentrate. Mine, recycling titanium and cobalt. Daye Iron Mine uses weak magnetic-strong magnetic and flotation to comprehensively recover iron, copper , cobalt and sulfur.
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