Method and device for preparing powdered iron through magnetizing low-iron red mud

Abstract

The invention discloses a method and a device for preparing powdered iron through magnetizing low-iron red mud, and belongs to the field of red mud processing process and equipment. The device is characterized by comprising a grate type roasting machine consisting of a roasting section, a preheating section and a drying section, and retaining walls are arranged among the three sections; the roasting section and the preheating section are connected with an air collecting pipe through an air passage; the air collecting pipe is communicated with a drying section through a fan and a blower pipeline; and a convey grate of the grate type roasting machine penetrates the roasting section, the preheating section and the drying section. According to the invention, a grate type low-temperature weak-reduction magnetizing roasting-wet-type weak-magnetic separation method is adopted for purifying low-iron red mud, and compared with the prior art, the method and the device have the advantages of being more energy-saving and economical, stable and high in production.

Description

technical field [0001] The invention belongs to the field of red mud treatment technology and equipment, and in particular relates to a method and device for magnetizing low-iron red mud to prepare iron concentrate. Background technique [0002] As the tailings of the alumina industry, red mud has the characteristics of low grade, high water content, and difficult to handle. At present, there are hundreds of millions of tons of low-grade red mud accumulated in the country. The storage of red mud not only takes up a lot of land, but also red mud tailings dams are also a serious source of danger, and a little carelessness will lead to tragedy. At the same time, the amount of iron loss taken away by red mud tailings is tens of millions of tons per year. How to develop and utilize low-grade red mud is still a problem that plagues experts and scholars at home and abroad so far. [0003] Since red mud with a total iron grade greater than 35% can be used in small batches in other...

AI Technical Summary

Problems solved by technology

The problem is that some of the current magnetization roasting beneficiation processes have high cost and low production capacity;

Especially for red mud treatment, the current process and equipment configuration is still extremely unsuitable. This is due to the physical properties of red mud itself (large water content and high viscosity) on the one hand. The temperature is lower, and it is easier to form low-melting point substances, resulting in continuous and stable production.

Images