A method for efficient separation and comprehensive utilization of iron, aluminum and sodium in high-iron red mud

Abstract

The present invention proposes a method for efficient separation of iron, aluminum and sodium from high-speed iron red mud. The method uses high-speed iron red mud as raw material, appropriately adds iron concentrate and coke powder, and then presses it into red mud pellets; after drying and preheating, it uses a rotary bottom The furnace directly reduces iron, sodium and other metal oxides; the reduced metallized pellets are sent to the iron bath type oxygen coal smelting reduction furnace for high-temperature melting and separation; the separated iron is used for steelmaking, and the high-aluminum slag is recycled after modification Aluminum oxide; sodium metal oxide is recovered from the smoke carried by the exhaust gas; the mixed gas produced by the oxygen coal smelting reduction furnace is modified and returned to the rotary hearth furnace for use. The invention can effectively realize efficient recovery and large-scale industrial comprehensive utilization of red mud resources.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for efficient separation and comprehensive utilization of valuable metal elements such as iron, aluminum and sodium in high-iron red mud. Background technique [0002] Red mud is a solid waste produced during the alumina production process. For every 1 ton of alumina produced by China's alumina enterprises, 1.0~1.8 tons of red mud will be produced by-product. At present, China's red mud stockpile has reached more than 200 million tons, and it is expected to reach 300 million tons in 2015. The stockpiling of red mud not only requires maintenance, but also occupies land, pollutes the environment, and has potential safety hazards. [0003] The red mud discharged after the commonly used Bayer method to produce alumina, its main chemical composition is: Fe 2 o 3 10~70wt%, Al 2 o 3 8~50wt%, SiO 2 7~15wt%, Na 2 O is 3~10wt%, and CaO is 10~25wt%. It can be seen that the ...

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Problems solved by technology

[0005] The above recovery methods for aluminum, iron, sodium, etc. all have problems such as high energy consumption, low recovery rate, economic infeasibility, and difficulty in large-scale industrial application, which seriously restrict the recovery and comprehensive utilization of valuable metals in red mud.