By: FTM MachineryJuly 23rd,2020
At present, there are about 300 kinds of iron ore in nature. According to their chemical composition, iron ore can be divided into magnetite, hematite, limonite and siderite. But according to the different magnetization coefficient of iron ore, iron ore is divided into strong magnetic and weak magnetic minerals, which provides the basis for the selection of beneficiation technology. Different properties of iron ore, the processing technology is completely different.
The composition of single magnetic iron ore is simple, magnetic strong, easy to wear and separation, so weak magnetic separation method is often used.
Polymetallic magnetite often contain silicate and carbonate minerals, cobalt pyrite, chalcopyrite or apatite, etc. It is suggested to adopt the combined process of weak magnetic separation and flotation, that is, the weak magnetic separation process is used to recover iron first, and then the flotation process is used to recover sulfide or apatite, which is conducive to obtaining a higher concentration index.
1、Single weakly magnetite
Single weak magnetite mainly includes hematite, siderite, limonite and siderite. Because this kind of mineral involves many kinds and has a wide range of particle size, the ore dressing method is also more complicated, which usually adopts the process of gravity separation, flotation, strong magnetic separation or their combination.
2、Polymetallic weakly magnetite
Polymetallic weakly magnetic iron ore refers to phosphorus-containing hematite and siderite ore. Most ore beneficiation plant will first use gravity separation, flotation, strong magnetic separation or combined process to recover iron minerals, then use the flotation process to recover phosphorus or sulfide.
Obviously, due to the large variety and complex nature, most iron ore will use multiple beneficiation combined processes to obtain ideal beneficiation indicators. It is recommended that mine owners must do a good job of beneficiation tests, and rationally choose the appropriate iron ore beneficiation process based on the final report results.
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