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Ironmaking and aluminum extraction comprehensive utilization method of high-iron red mud

A high-iron red mud and red mud technology, applied in the field of metallurgy, can solve the problems of unfeasible economy, low recovery rate, and inability to realize large-scale industrial application, so as to reduce the emission of NOx and greenhouse gas CO2, and solve the problem of blast furnace slag Adhesive, beneficial effect of separation and trapping

Active Publication Date: 2012-12-12
NORTHEASTERN UNIV
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Problems solved by technology

[0006] To sum up, the currently implemented methods for recovering valuable elements such as aluminum, iron, and sodium from red mud all have problems such as high energy consumption, low recovery rate, economically unfeasible, and large-scale industrial application. Seriously restrict the recovery and comprehensive utilization of valuable metals in red mud

Method used

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Examples

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Effect test

Embodiment 2

[0039] This example is basically the same as Example 1, except that the processing method of high-iron red mud minerals in Step 1 is as follows: the mixed red mud and other iron-containing materials are pelletized with an improved cylinder pelletizer or disc pelletizer. The ball machine produces small balls with a diameter of 3-8 mm, then rolls fuel and CaO powder on the surface of the small balls, distributes them on the sintering trolley, ignites and sinters, and sinters into molten and bonded grape-shaped qualified sintered ore; the charge in step 2 The temperature range is 1000°C, the total iron content of iron-containing materials is 45wt%, the lower tuyeres of the blast furnace are blasted with an oxygen enrichment rate of 60%, the hot air temperature is 1000°C, and the furnace body is injected with 900°C coke oven gas of 100Nm 3 / t; In step 3, in the aluminum recovery process, the amount of lime added must ensure that the alkalinity of the slag is CaO / SiO 2 =2.04, CaO / A...

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Abstract

The invention provides an ironmaking and aluminum extraction comprehensive utilization method of high-iron red mud. The method is characterized in that a blast furnace is used as main equipment; red mud is utilized to prepare micropellet composite sinter or pellet; micropellet composite sinter or pellet and coke are then treated with hot charging into the furnace layer by layer at no less than 400 DEG C; rich oxygen to full oxygen blast is employed; and tuyeres on the furnace body are increased, and reducing gas rich in hydrogen is blown into the furnace, so as to realize red mud ironmaking. At the same, calcium oxide is added during a deslagging process; the slag is treated with temperature control cooling to obtain self-pulverization calcium aluminate slag, which is leached and extracted with alumina; and sodium element is synchronously recovered from high temperature exhaust of the furnace top, so as to complete efficient separation and recycling of aluminum, iron and sodium in the red mud.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a comprehensive utilization method for ironmaking and aluminum extraction from high-iron red mud, in particular to a method for recovering iron, aluminum, sodium and other valuable metal elements from high-iron red mud. Background technique [0002] High-iron red mud is a kind of Fe produced in the process of extracting alumina from bauxite 2 o 3 Solid waste with a content exceeding 30% by weight. Enterprises in China's alumina industry will produce 1.0-1.8 tons of red mud for every 1 ton of alumina produced on average. Today, China's red mud stockpile has reached more than 200 million tons, and it is expected to reach 300 million tons by 2015. The storage of red mud not only needs to maintain its slope stability, but also occupies land, pollutes the environment, and poses serious safety hazards. [0003] Theoretically speaking, high-iron red mud is a very valuable resource f...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B5/06C22B1/14C22B7/04C22B21/00
CPCY02P10/143Y02P10/20Y02P10/25
Inventor 李强张伟邹宗树
Owner NORTHEASTERN UNIV
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