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

A high-iron red mud and high-efficiency technology, applied in the field of metallurgy, can solve the problems of high energy consumption, economic unfeasibility, and restrictions on red mud recovery and comprehensive utilization, and achieve good economic benefits and large-scale industrial applications.

Active Publication Date: 2014-10-08
NORTHEASTERN UNIV LIAONING
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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.

Method used

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Embodiment 2

[0031] This embodiment is basically the same as Embodiment 1, the difference is that the chemical composition of the red mud is mainly: Fe 2 o 3 37.03wt%, Al 2 o 3 19.87wt%, SiO 2 8.26wt%, Na 2 O4.68wt%, and the rest is water and impurities. At the same time, add iron concentrate powder to the red mud so that the total iron content of the pellets is TFe=50%, and the molar ratio of coal powder and C / O=1.15, mix Finally, carbon-containing pellets with a diameter of 8 to 16 mm were produced by using a briquetting machine. The pellets were spread into three layers at the bottom of the furnace, the oxygen enrichment rate of the combustion air was 10%, the furnace temperature was controlled at 1280°C, and the reduction time was 30 minutes. The metallization rate is 90% metallized pellets, the reduced sodium metal forms sodium vapor under the high-temperature reducing potential on the surface of the pellets, and the sodium vapor enters the upper high-oxidizing atmosphere and is o...

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Abstract

The invention provides a method for high-efficiency separation and comprehensive utilization of iron, aluminum and sodium in high-iron red mud. The method comprises the following steps of adding iron ore concentrate and coke powder into high-iron red mud as a raw material, pressing the mixture into red mud pellets, drying, pre-heating, directly reducing metallic oxides of iron and sodium by a rotary hearth furnace, feeding the reduced metalized pellets into an iron bath-type oxy-coal smelting reduction furnace, carrying out high-temperature melting separation, using separated iron for steel-making, recovering alumina from the modified high-aluminum slag, recovering the metallic oxide of sodium from smoke dust carried by exhaust gas, improving quality of mixed gas produced by the iron bath-type oxy-coal smelting reduction furnace, and feeding back the treated mixed gas to the rotary hearth furnace for use. The method provided by the invention can effectively realize high efficiency recovery and large-scale industrial comprehensive utilization of a red mud resource.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C22B1/24C10K3/00
CPCY02P10/20
Inventor 李强张伟邹宗树
Owner NORTHEASTERN UNIV LIAONING
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