Method for Simultaneously Improving the Activity of Inorganic Components by Iron Oxide in Red Mud Reduction by Biomass

Abstract

The invention discloses a method for biomass reduction of iron oxide in red mud and synchronous improvement of inorganic component activity, and belongs to the technical field of iron ore concentrate production by high-iron Bayer process red mud. The usage of biomass accounts for 5%-50% that of the high-iron Bayer process red mud, raw materials are weighed and uniformly mixed, and obtained mixture is sintered at the temperature ranging from 400 DEG C to 750 DEG C. Iron ore concentrate meeting blast furnace iron making requirements and inorganic materials with high cementitious activity are obtained after magnetic separation. Biomass raw materials replace pulverized coal to reduce hematite in the high-iron Bayer process red mud, reduction temperature can be reduced by about 200 DEG C, and optimal inorganic component cementitious activity can be synchronously obtained. The steps of hematite reduction and inorganic cementitious activity improvement are combined, the high-iron red mud serving as solid waste discharged in the aluminum oxide production process is used by 'stepped all components', energy consumption is reduced as compared with carbon-based reduction, carbon emission is decreased, investment and production cost is reduced, and environmental benefits, social benefits and economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of producing iron concentrate from high-iron Bayer process red mud, and particularly relates to a method for synchronously improving the gelling activity of inorganic components by reducing iron oxide in red mud by low-temperature magnetization of biomass. Magnetization roasting technology is mainly applied to iron ores with weak magnetism such as hematite and limonite. Using reducing agents such as coal and natural gas, these ores are reduced to magnetite under certain temperature and atmosphere conditions. After magnetization, the phase of the ore changes, and the hematite and limonite become magnetite, and the magnetism can be increased by several orders of magnitude. Using the huge magnetic difference between the iron ore and the gangue after roasting, the iron ore can be separated by weak magnetic separation. [0002] To improve the gelling activity of tailings, it is generally necessary to activate iron ...

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Problems solved by technology

The application of iron tailings in building materials is an important way to realize its large-scale and efficient utilization. However, due to the low gelling activity of iron tailings, it cannot be used in large amounts in building materials. Therefore, it is necessary to increase its gelling activity and increase its usage. An important means to expand the consumption of iron tailings

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