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What are the Common Iron Processing Methods?

xinhai 2020-03-02(03:03:28) 1150 0

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As one of the earliest, most widely used and most widely used metals in the world, iron ore is an important raw material for iron and steel production. At present, iron ore resources are decreasing day by day, which is characterized by more lean ore than rich ore, more associated ore and complex ore composition. There are many kinds of iron ore processing technologies, so what are the common iron processing methods?

iron processing

1. Magnetic Iron Ore Processing

Because of the strong magnetism of magnetite, the main magnetic iron ore processing technology is weak magnetic processing technology. The iron ore processing flow of magnetic includes:

1) Single Weak Magnetic Separation Process

It is suitable for simple single magnetite. It can be divided into successive-grinding, weak magnetic separation process and stage-grinding, weak magnetic separation process. Successive-grinding weak magnetic separation process is suitable for magnetite with coarse grain or high-grade iron. Stage-grinding weak magnetic separation process is suitable for low grade magnetite with fine grain.

2) Weak Magnetic - Flotation Separation Process

It mainly points at iron ores which are difficult to increase its fineness or with many SiO2 impurities. It includes weak magnetic-cation anti-flotation separation process and magnetic-positive anion flotation separation process.

3) Weak Magnetic - Strong Magnetic - Flotation Separation Process

It is mainly dealing with iron ores with multiple metals and complex iron ore. 

iron ore processing plant

2. Hematite Iron Ore Processing

Hematite is weak magnetic ore, which can be easier separation by flotation than magnetite. In the old days, hematite was separated by gravity separation, however it was weed out for unreachable capacity. Now hematite iron ore processing technologies include as follows:

1) Weak Magnetic - Strong Magnetic Separation

Commonly, weak magnetic separation can be added before strong magnetic separation to remove the strong magnetic ore or impurity in raw ore. Then strong magnetic separation is used to separating hematite, which is also the work flow of the mixture of magnetite and hematite.

2) Flotation

Hematite is easier to floated than magnetic, which could be separated by positive flotation. As the density of iron ore is much higher than that of gangue mineral, gangue mineral is more likely to attach to the foam than iron ore. Therefore, for iron ore, reverse flotation is more advantageous than positive flotation. When the magnetite content mixed in hematite is higher, reverse flotation is a more convenient method for separation.

3) Strong Magnetic - Flotation Combined Separation

In the process of high intensity magnetic-flotation, a part of gangue mineral in the ore is firstly removed by high intensity magnetic separation, and then the coarse concentration of high intensity magnetic separation is sent to the flotation to obtain the final qualified concentrate.


3. Limonite Iron Ore Processing

Limonite is one of the main iron ores, but its iron content is lower than magnetite and hematite, and it is a secondary iron ore. At present, the industrial application of limonite iron ore processing process includes:

1) Single Concentration Process

The single separation process of lignite is mainly used for the lignite with high iron content and good selectivity, which can be divided into a single magnetic separation process and a single gravity separation process. The single gravity separation process is used to deal with the ore with coarser grain size, and the equipment is selected according to the grain size of the ore. Single magnetic separation process generally refers to a single strong magnetic separation process, this process has a strong adaptability to the ore, the concentrate is easy to concentrate and filter, but it is not suitable for fine grade slime.

2) Combined Dressing Process

The combined separation process only used for limonite includes magnetization - magnetic separation process, flotation - strong magnetic separation process, heavy separation - strong magnetic separation process, etc., which are used for the treatment of limonite with relatively complex composition. The specific technological process shall be determined after the ore separation test has proved the ore properties.


3. Siderite Iron Ore Processing

Like limonite, siderite is a low-grade iron ore that is unstable. The iron ore processing technologies used in siderite concentrator are gravity separation and strong magnetic separation. Different siderite has different separation methods. Single siderite with coarse grain size is suitable to be treated with single gravity separation, single strong magnetic separation and combined process including the two. For siderite with fine grain size, effective technological processes include roasting magnetic separation, strong magnetic separation, flotation or magnetic flotation combined process.

Siderite containing magnetite can be separated by a combined process of weak magnetic separation and gravity separation, strong magnetic separation, or flotation in series, or a more complex process.


The above are commonly used iron processing methods. In actual production, the appropriate processing methods should be selected according to the nature of the ore.You can also consult with a professional manufacturer.

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