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Method for recycling high-iron red mud as steelmaking slag former/dephosphorizing agent

A technology of steelmaking slagging agent and high-iron red mud, which is applied in the field of iron and steel smelting, can solve the problems of limited consumption and single use method, and achieve the effects of good fluidity, pollution reduction and production cost reduction

Active Publication Date: 2014-07-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-iron red mud is the main solid waste of alumina produced by the Bayer process. High-iron red mud contains very rich iron resources and should be an ideal raw material for iron and steel production enterprises. However, due to Na 2 The content of O is relatively high, and the way of use is single. It is only used for sintering or pelletizing process, and the actual consumption is very limited (<5% (sintering / pelletizing) total material). At present, the main treatment method of high-iron red mud is still the storage yard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The high-iron red mud produced by a domestic aluminum factory using the Bayer method is selected. The mass percentage of each substance in the red mud includes (wt%): Fe 2 o 3 59.1%, SiO 2 10.6%, Al 2 o 3 16.2%, Na 2 O 7.6wt%, TiO 2 4.1wt%, the remaining ingredients <2%. The specific test method is as follows:

[0020] Dry the red mud in a muffle furnace at 400°C for 1 hour. After cooling, use a ball mill to grind the red mud and lime into powder, pass through a 200-mesh sieve, and make red mud and quicklime at a mass ratio of 1:0.6. With slag. Add pig iron ([%C]=4.5%, [%P]=0.108%, [%Si]=0.23%) into a magnesium oxide crucible, heat it to 1400°C in a silicon-molybdenum furnace, and pass argon protective gas , until the pig iron is melted, add the slag to the molten iron at a mass ratio of 1:10, first add 70-80% of the total amount of slag, and then add the rest according to the reaction situation, keep it warm for 1 hour, then take out the crucible and pl...

Embodiment 2

[0023] The high-iron red mud produced by a domestic aluminum factory using the Bayer method is selected. The mass percentage of each substance in the red mud includes (wt%): Fe 2 o 3 59.1%, SiO 2 10.6%, Al 2 o 3 16.2%, Na 2 O 7.6wt%, TiO 2 4.1wt%, the remaining ingredients <2%. The specific test method is as follows:

[0024] Dry the red mud in a muffle furnace at 400°C for 1 hour. After cooling, use a ball mill to grind the red mud and lime into powder, pass through a 200-mesh sieve, and prepare high-iron red mud and quicklime at a mass ratio of 3:2. into slag. Add pig iron ([%C]=4.35%, [%P]=0.308%, [%Si]=0.24%) into the corundum crucible, heat it to 1350°C in a silicon-molybdenum furnace, and pass argon protective gas, When the pig iron is melted, add the slagging agent to the medium phosphorus iron water at a mass ratio of 1.8:10, first add 70-80% of the total amount of slag, and then add the rest according to the reaction situation, keep it warm for 1 hour, and...

Embodiment 3

[0027] The high-iron red mud produced by a domestic aluminum factory using the Bayer method is selected. The mass percentage of each substance in the red mud includes (wt%): Fe 2 o 3 59.1%, SiO 2 10.6%, Al 2 o 3 16.2%, Na 2 O 7.6wt%, TiO 2 4.1wt%, the remaining ingredients <2%. The specific test method is as follows:

[0028] Dry the red mud in a muffle furnace at 400°C for 1 hour. After cooling, use a ball mill to grind the red mud and lime into powder, pass through a 200-mesh sieve, and prepare high-iron red mud and quicklime at a mass ratio of 1:0.7. into slag. The mixed slag is made into blocks or pellets by sintering and then used together with dolomite or magnesium balls in an appropriate proportion to refine slag that is beneficial to furnace conditions. Add pig iron ([%C]=4.5%, [%P]=0.108%, [%Si]=0.5%) into the corundum crucible, heat it to 1400°C in a silicon-molybdenum furnace, and pass argon protective gas, When the pig iron is melted, add the slagging ...

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Abstract

The invention discloses a method for recycling high-iron red mud as a steelmaking slag former / dephosphorizing agent. The red mud is solid waste generated when alumina is produced by adopting a Bayer process, and the existing treatment method of the solid waste is to be stored in a yard. The method comprises the following step: mixing the air-dried and levigated mud red with lime at the mass ratio of 1:(0.6-0.8), as a slag former / dephosphorizing agent during a steelmaking process. The invention provides a conception of recycling the iron element in waste red mud in an aluminum plant and removing elements of Si, P and the like in molten iron, desiliconization and dephosphorization can be carried out by fully utilizing the high oxidization and high alkalinity of the high-iron red mud, and the iron element in the red mud can be recycled. Silicon element in the iron can be removed to be below 0.1% and the phosphorous removal rate can achieve more than 76% under the condition of no oxygen blowing, the majority of Fe element in the high-iron red mud enters a molten iron melting pool, so that the recycling of red mud can be realized, the production cost can be lowered, and further multiple purposes of changing wastes into valuables, protecting the environment and the like can be achieved.

Description

technical field [0001] The invention relates to the fields of iron and steel smelting and non-ferrous metal smelting, in particular to a method for recycling high-iron red mud produced by Bayer process in alumina production. Background technique [0002] High-iron red mud is the main solid waste of alumina produced by the Bayer process. High-iron red mud contains very rich iron resources and should be an ideal raw material for iron and steel production enterprises. However, due to Na 2 The content of O is relatively high, and the way of use is single. It is only used for sintering or pelletizing process, and the actual consumption is very limited (<5% (sintering / pelletizing) total material). At present, the main treatment method of high-iron red mud is still the storage yard . If the high-potential iron-containing resource of high-speed iron red mud is utilized, it can not only solve the environmental pollution problem caused by red mud storage yards, but also save the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/00
CPCY02P10/20
Inventor 张延玲田冬东闻昕舒王瑞敏张照懂杨森
Owner UNIV OF SCI & TECH BEIJING
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