Device and method for preparing fine iron powder through suspension roasting of red mud

Abstract

The invention relates to a device and a method for preparing fine iron powder through suspension roasting of red mud, and belongs to the technical field of mineral processing. The device comprises a feeding bin (1), a cyclone separator (11), a suspension roasting heat accumulator (3), a combustor (4), a suspension roasting oxidizer (5), a reducer (6), a cooler (7) and a magnetic separator (8). The method comprises the steps of (1) preparing the red mud into red mud mineral powder, and placing the red mud mineral powder into the feeding bin; (2) conveying the powder to the cyclone separator through a screw feeder, and enabling the powder to enter the suspension roasting heat accumulator; (3) enabling materials in the suspension roasting heat accumulator to be kept in oxygen excess combustion through the combustor; (4) starting a roots blower, wherein preheated solid materials in the suspension roasting heat accumulator enter the suspension roasting oxidizer; (5) oxidizing the materials, enabling the materials to enter the reducer, and carrying out the reduction reaction; (6) enabling the materials to enter the cooler, and then enabling the materials to enter the magnetic separator to be subject to magnetic separation. The device and method provided by the invention have the advantages of high heat and mass transfer efficiency, recoverability of waste heat, large processing capacity, suitability for large-scale industrial production, and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a device and method for preparing iron fine powder by suspending and roasting red mud. Background technique [0002] Red mud is the main waste residue produced in the alumina production process. Its existence not only occupies a large amount of land and increases maintenance costs, but also the alkaline substances in red mud pollute the environment, destroy the soil structure, pollute the groundwater, and seriously endanger the People's health; if the recycling of red mud can be realized, it can not only save resources and reduce environmental pollution, but also has certain social significance. In addition, with the development of my country's iron and steel smelting industry, the raw material iron ore is increasingly depleted. If the iron in the red mud can be effectively used, the pressure of the shortage of iron ore resources in the iron and steel indus...

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Problems solved by technology

[0003] Patent CN 201310247327.4 relates to a method and device for magnetizing low-iron red mud to prepare iron concentrate powder. The method and device for preparing iron concentrate powder by magnetizing low-iron red mud using a grate roaster have achieved certain results, but there are still products Low grade and recovery rate, low heat and mass transfer efficiency; patent CN 201610956537.4 relates to a method of microwave roasting by mixing red mud and alkali lignin reducing agent. This method successfully recovers certain iron minerals in red mud and has The characteristics of safety and environmental protection, but the quality of the reduction product of this process depends on the characteristics of the reducing agent alkali lignin, and the heat consumption is high, and the processing capacity is low; , large processing capacity, and easy-to-industrialize technology and equipment are of great significance

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