The characteristics of China’s iron ore

Rich in lean ore, Iron content below 45% occupy the 86% of total reserves. Rich in red ore, different kind of weak magnetic ore occupy the 65% of total reserves. And most of the useful minerals in the ore were fine as well as micro- fine Disseminated, need to be grinded into 200 meshes, and occupy about 80%, only that can Reach individual dissociation. The features of our iron ore rose extremely difficult Task for beneficiation.

Magnetic beneficiation process

According to the mineral composition of iron ore and nature, we use a variety of treatment methods currently. The ore mainly with magnetite adopt the Simple and effective method of weak magnetic beneficiation, If one still containing weakly magnetic hematite and other iron minerals, then using the gravity dressing method for Additional recycling. The ore which contained hematite mainly (belong to red ore), can choose the method of gravity dressing or floatation method.

Roasting and magnetic separation has been ten years history in the production, Process maturity, high technical target, however, this method request of large infrastructure investments and maintenance of beneficiation equipment, and often limited by the conditions of gas supply. But the flotation machine has the advantage of larger handing capacity, stable production targets, it is the effective way to hand Fine-grained disseminated hematite. The weak point is easy to cost precious Flotation drugs, and hard to get the Quality concentrate ore, it is also difficult dehydration for ore concentrate. The common weak point of two kinds of method is Poor production conditions, Heat release of emissions, waste water, Pollution to the environment.

Processing magnetic – magnetic red mixed ore can be used – floating or magnetic – re co processes. For other types of iron ore, like limonite, siderite (both of which also belong to the red ore), vanadium-titanium magnetite and other minerals are used by different mineral composition of the re-election washing, roasting and magnetic separation or magnetic – gravity dressing – electrical method law.

Gravity dressing is the main method for handing the Coarse-grained hematite, the other beneficiation can compare with it in the Technical and economic indicators. It’s also has the new development in Micro- fine and fine iron ore processing recently years.

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