Iron ore beneficiation technology

    1. magnetic iron ore beneficiation
It is 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) (Figure 1). The series of permanent magnetization developed by China has made the magnetic separator realize permanent magnetization. 70 years later, due to the magnetite concentrator in the country to promote a fine sieve and then grinding the new technology, the concentrate grade increased from 62% to about 66%, to achieve the requirements of the Ministry of metallurgical industry proposed concentrate grade of 65%.

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    2. Weak magnetic iron ore dressing
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 Anshan Steel Qidashan Concentrator uses a new process of weak magnetic-strong magnetic-flotation (Fig. 2), which has achieved encouraging results.

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3. Polymetallic (concomitant) ore dressing ore This type of ore is complex and diverse, so the methods, equipment and processes used are different. For example, the Bayan Obo iron ore uses reverse flotation - multi-gradient magnetic separation and flocculation Different processes such as selection, weak magnetic-reverse flotation-strong magnetic separation, weak magnetic-positive flotation, roasting magnetic separation, etc., in order to improve the recovery rate of iron and comprehensively recover 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.
The following table lists the technical and economic indicators for mineral processing of different ore types in China's key iron ore dressing plants in 1996.

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