Separation and recovery method for ferrum and manganese in electrolytic manganese residues

Abstract

The invention discloses a method for efficiently decomposing complex ferrum and manganese phases in high-ferrum electrolytic manganese residues and synchronously recycling ferrum and manganese. The electrolytic manganese smelting waste residues containing the complex ferrum and manganese phases are subjected to neutral roasting under the protective atmosphere (N2), and by controlling the roasting conditions, the complex ferrum and manganese phases in the manganese residues are decomposed into ferric oxide and trimanganese dioxide. Meanwhile, volatile matters, crystal water and the like in the electrolytic manganese residues are removed in the neutral roasting process, and ferrum and manganese in the manganese residues achieve upgrade. The products of the neutral roasting can be directly subjected to dissociation through ball milling, efficient separation and recovery of ferrum and manganese are achieved through stepped magnetic separation, or by means of reduction roasting treatment, the ferric oxide is further reduced into ferroferric oxide, the reduction roasting products are subjected to the ball-milling-magnetic separation process, and then ferrum and manganese separation and recovery are achieved. The method is suitable for various kinds of Fe-Mn ore or manganese residues which are difficult to treat, and has the beneficial effects that the application range is wide, the process equipment is simple, and operation is easy. Efficient decomposition of the complex ferrum and manganese phases and separation and recovery of the ferrum and manganese phases in the high-ferrum electrolytic manganese residues can be achieved, and reduction and recycling of ferrum-manganese-contained solid waste can be achieved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of combining mineral processing and environmental engineering, and specifically relates to an electrolytic manganese slag that uses neutral-reduction roasting to change the iron and manganese phases of samples, and then recovers iron and manganese through ball milling and cascade high-efficiency magnetic separation. [0003] Background technique: [0004] Electrolytic manganese waste slag is the filtered acid slag produced in the production process of electrolytic manganese metal. The heavy metal content in the slag is high and the environmental risk is great. The main iron and manganese-containing substances in the slag are red limonite, pyrolusite, bixbyite, etc., which are recycled and reused. The value is high, and its harmless and resourceful treatment has become a research hotspot in the field of electrolytic manganese industry. At present, the main treatment methods of this kind of solid waste ...

AI Technical Summary

Problems solved by technology

Although the reduction roasting method is widely used in the reduction of iron oxides or manganese oxides, when dealing with the iron-manganese composite phases in the above-mentioned waste residues, due to changes in the valence state of iron and manganese, the proportion of iron and manganese ions in the crystal lattice will be affected. On the contrary, it leads to the formation of more complex composite phases, which makes it more difficult for the subsequent iron and manganese separation of roasted products.

If the iron and manganese resources in electrolytic manganese slag are not properly treated, it will not only cause a lot of waste of iron and manganese resources, but also cause certain pollution to the environment

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