Bottom-top composite injection smelting reduction furnace for treating high-iron red mud

Abstract

The invention relates to the field of comprehensive utilization of red mud, in particular to a bottom-top composite injection smelting reduction furnace for treating high-iron red mud. The furnace comprises a horizontal furnace body, a vortex feed inlet, a bottom-top injection system, an overflow slag outlet, a siphon tap hole and a flue gas outlet, wherein the vortex charging port corresponds to the molten pool vortex area; the bottom-top composite injection system comprises a bottom spray gun and a top spray gun, wherein the bottom spray gun injects a gas reducing agent such as natural gas or coal gas to strengthen a multi-phase reaction process; the top spray gun sprays oxygen-enriched air and fuel combustion heat compensation, and simultaneously combusts CO released in the reduction process to keep the heat balance of the system; a siphon tap hole and the overflow slag hole are formed in the other end of the furnace body, so that continuous tapping and continuous deslagging are realized; and the flue gas outlet is formed in the upper part of the same end of the iron outlet and the slag outlet, and is connected with a flue gas boiler for recovering flue gas. According to the smelting reduction furnace, the smelting reduction efficiency can be improved, system energy is fully utilized, and continuous production of extracting iron from red mud is achieved.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of red mud, in particular to a bottom-top compound injection smelting reduction furnace for processing high-iron red mud. [0002] technical background [0003] 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, and its use ratio is higher than 50%. The discharge of high-iron red mud is more than 60 million tons, of which iron oxide content is more than 30%. ~50%. [0004] For the comprehensive utilization device of high-speed iron Bayer red mud, relevant domestic researchers have carried out a lot of research work, such as Li Shiqi et al. published "a kind of ultra-fine grinding high-speed iron red mud fine reduction device, application numb...

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Problems solved by technology

[0006] Although the above patents can reduce the red mud, the equipment is complex and the reduction time is long, and the heat utilization rate is low

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