Comprehensive utilization method for bottom-top composite blowing smelting reduction of high-iron red mud

Abstract

The invention discloses a comprehensive utilization method for bottom-top composite blowing smelting reduction of high-iron red mud. The comprehensive utilization method mainly comprises the following steps: the high-iron red mud is mixed with a reducing agent, a slag former and fluorite; the mixed raw materials are added into a reduction furnace molten pool for a reduction reaction, oxygen-enriched air and fuel gas are blown to the top in the reduction process, and mixed gas of reducing gas and oxygen is blown to the bottom in the reduction process; and low-sulfur and low-phosphorus pig iron and reducing slag are obtained through bottom-top composite blowing smelting reduction, and rock wool products are prepared through tempering, centrifuging and wire drawing and fiber forming of the thermal-state reducing slag. By means of bottom-top composite blowing smelting reduction, continuous reduction of the high-iron red mud can be achieved, a low-residue high-quality pig iron product is directly obtained, the reduction rate of iron reaches 95% or above, and meanwhile the recovery rate of sodium oxide reaches 70% or above.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of red mud by Bayer method, and in particular relates to a comprehensive utilization method of high-iron red mud by combined bottom-top blowing and smelting reduction. Background technique [0002] China is a big country of alumina, with an annual output of more than 70 million tons of alumina and a discharge of more than 100 million tons of red mud. With the depletion of China's aluminum resources, my country needs to import a large amount of high-iron gibbsite ore to produce alumina every year. At present, 50% of my country's alumina production uses high-iron gibbsite ore as raw material for production, and the annual high-iron red mud The emission is more than 60 million tons, which contains 30% to 50% iron oxide. [0003] For the comprehensive utilization of high-speed iron red mud by the Bayer process, relevant domestic researchers have carried out a lot of research work, such as the ...

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Problems solved by technology

[0006] Although the above method can realize the utilization of multiple components such as iron / aluminum in red mud, there are many problems such as the inability to directly obtain pig iron products, or the need for auxiliary means such as iron baths in the process of reducing pig iron, and the inability to realize large-scale consumption of red mud.

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