Mainly at home and abroad a- chemical production of iron oxide, and products for the ferrite permanent magnet material. In chemical production, due to the different sources of iron-containing raw materials, the types and contents of impurities are different. Under the same production process conditions, the difference in the quality of iron oxides is inevitable, thus affecting the production of ferrite devices. The crystal structure of the natural mineral hematite is stable. The chemical composition and impurity content of the ore in the same deposit are basically the same. Therefore, 6t iron oxide is extracted from the hematite ore, which has good stability and consistency.

1 preparation process of iron oxide

1.1 Extraction of a-Fe203 coarse concentrate

After investigation, hematite was selected as a source of ore in a mine in Anhui, and its main minerals were hematite and quartz . The difference in specific gravity between them is large, and re-separation can be used. In addition, the ore contains less ferromagnetic minerals (magnesia accounts for about 1-2). The use of magnetic separation to discard part of the tailings and re-election can reduce the loss of iron minerals in re-election. According to the original ore fineness test and different magnetic field strength tests, it is better to use a product with a grinding degree of ~200 mesh and a magnetic field strength of 6.366×106 A/m for shaker re-election to obtain a better coarse concentrate.

1.2 Deep processing of a-Fe203 coarse concentrate

The iron oxide extracted by the process does not meet the requirements in terms of purity and impurity content. In order to further reduce harmful impurities such as Si and Mg, it is difficult to achieve by physical sorting only. Deep processing considers the use of selective dissolution to obtain impurity elements. Effectively eliminated. After testing, it was found that when a fluorine-containing solvent was used, SiO 2 was significantly reduced without damaging the a-Fe 2 o 3 . At the same time, in the multi-wash decantation, the diluted aqueous solution also carries away some of the impurities adsorbed by the gel, as well as fine floating matter, so that other impurities such as calcium, magnesium and the like are reduced. Therefore, relevant expansion experiments were carried out on selective dissolution to determine the process conditions:

1.3 Preparation of finished ferric chloride

After deep processing of the mouth-Fe203 concentrate, its purity and impurity content are basically up to standard, but the particle size must be further finely ground. After comparison of multiple schemes, the Co6-1 sand mill is selected for wet grinding for 5 hours, and then dehydrated and dried by a centrifuge. , drying, pulverizing, packaging, that is, the finished iron oxide.

2 product quality

2.1 Product impurity element content

Through the separation process of hematite and the deep processing of the final coarse concentrate, a product with a mouth-Fez content of 99.68% was obtained, and its impurity element content was detected. The purity and impurity content are substantially in accordance with the requirements for the production of iron oxide required for ferrite devices.

3 Conclusion

Since the natural mineral hematite is widely distributed in nature and has large reserves. Under the same geological conditions, the physical properties of the ore are relatively uniform, and the same process can be used to mass produce high-quality iron oxide with good stability and consistency. The device provides ideal raw materials.

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