1. Introduction firing low magnetization magnetic hematite, limonite, siderite, pyrite and other minerals, with a weak magnetic separation can not be recovered, but a magnetizing method of firing them into the ferromagnetic iron minerals (magnetite or hematite) and then recovered by weak magnetic separation. The limonite first discharges the combined water during the heating process, becomes hematite which does not contain water, and is reduced to magnetite according to the above reaction. 3 oxidative roasting - suitable for pyrite. Pyrite is oxidized to pyrrhotite in an oxidizing atmosphere (or a large amount of air) for a short time. The chemical reaction is as follows: 7FeS 2 +6O 2 —→ Fe 7 S 8 +6SO 2 If the oxidation time is long, the pyrrhotite becomes magnetite: [next] 3Fe 7 S 8 +38O 2 —→7Fe 3 O 4 +24SO 2 In addition to the above three calcination methods, there are also redox calcination and reduction oxidative calcination, but the most important one is reduction calcination.
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Magnetization roasting is the process of physicochemical melons in the corresponding atmosphere after the ore is added to a certain temperature. According to the different ores, the chemical melons are different. Magnetized calcination can be divided into reduction calcination, neutral calcination and oxidative roasting according to its large batch.
1 reduction roasting - suitable for hematite and limonite. Commonly used reducing agents are C, C0 and H 2 and the like. The chemical reaction of hematite is as follows: 
2 Neutral roasting - suitable for siderite. The siderite is decomposed into magnetite when heated to 300-400 ° C without air or a small amount of air. The chemical reaction is as follows:
The reducing agent for heating the raw material and the reducing process in the calcination can be classified into gas, liquid and solid. The industry's most commonly used is coal gas, heavy oil and coal.
2. Magnetic separation of calcined products
Anshan-type hematite plays an important role in China's iron ore resources. The mineral composition in the ore is relatively simple. The main iron minerals are pseudo-hematite, hematite, magnetite, followed by specular iron ore, pyrite, and a small amount of limonite, goethite, siderite and Iron dolomite and so on. Gangue minerals quartz, followed by tremolite, amphiboles, actinolite, sericite, chlorite, calcite, and the like.
Jing Tieshan type iron ore also plays a certain role in iron ore resources. Jiuquan Iron and Steel Company beneficiation plant for disposal of this type of iron ore that is. The main iron minerals in the ore are specular iron, limonite and siderite. The main gangue minerals are barite , quartz, jasper and iron dolomite. The ore has two structures, strip and block, and is mainly strip-shaped. The size of the inlaid cloth between the iron minerals is small, granular or scaly, and there are rare minerals such as barite and siderite, so it is not difficult to break or dissociate. [next]
The lump ore part of the above two types of ores generally enters the magnetization in the magnetization roaster, and the magnetized products are sorted by weak magnetic separation, and the fine ore is sorted by strong magnetic separation or flotation.
The production process of Jiugang Concentrator is shown in Figure 1. The roasting ore weak magnetic separation process is basically the same as the general magnetic separation process. The principle flow is shown in Figure 2. In the process, there are occasional re-selection devices such as spiral chutes and cyclones.
Jiugang concentrator production process
Weak magnetic separation principle process of Jiugang concentrator