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Method for red mud reduction by adopting gas-based shaft furnace

A red mud and air-based technology, applied in the field of metallurgy, can solve problems such as red mud research is only in the laboratory stage, adverse effects on the ecological environment, limited red mud chemical composition, etc., achieve good results, reduce energy consumption, save Effect of the coking step

Pending Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the stacking volume of red mud in my country exceeds 200 million tons. The stacking and disposal of a large amount of red mud not only does not make full use of resources, but also has an adverse impact on the ecological environment.
[0003] Limited by the chemical composition of red mud, there is no precedent for industrial application so far, and the research on red mud is only in the laboratory stage

Method used

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  • Method for red mud reduction by adopting gas-based shaft furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment adopts figure 1 The process flow shown for Bayer process red mud is as follows:

[0065] Prepare red mud raw materials;

[0066] The red mud raw material is dried to a moisture content below 5%, and finely ground. Select 1000g of red mud powder with particle size ≤0.15mm.

[0067] Put the above-mentioned red mud powder, 50g CaO and 80g water into a mixer, and mix together for 20 minutes; then put the mixture into a disc pelletizer to form the first pellet with a diameter of 8mm.

[0068] The first pellets were dried in a drying oven at 105°C for 24 hours, then sent to a roasting furnace, and fired for 15 minutes in an oxidizing atmosphere at 1200°C to obtain oxidized pellets.

[0069] Send the metallized pellets into the air-based shaft furnace, pass in reducing gas with a temperature of about 950°C, and reduce for 4 hours to obtain the metallized pellets.

[0070] The metallized pellets are cooled and crushed, then rubbed to ≤75 μm (passing through ...

Embodiment 2

[0079] This embodiment adopts figure 1 The process flow shown to treat red mud is as follows:

[0080] Prepare red mud raw materials;

[0081] The red mud raw material is dried to a moisture content below 5%, and finely ground. Select 1000g of red mud powder with particle size ≤ 1mm.

[0082] Put the above-mentioned red mud powder, 20g CaO and 50g water into a mixer, and mix together for 15 minutes; then put the mixture into a disc pelletizer to form the first pellet with a diameter of 16mm.

[0083] Put the first pellet into a drying oven at 105°C for 24 hours, then put it into a roasting furnace, and bake it in an oxidizing atmosphere at 1050°C for 5 minutes to obtain oxidized pellets.

[0084] Send the metallized pellets into the air-based shaft furnace, pass in reducing gas with a temperature of about 800°C, and reduce for 7 hours to obtain the metallized pellets.

[0085] The metallized pellets are cooled and crushed, then rubbed to ≤75 μm (passing through a 200-mesh ...

Embodiment 3

[0094] This embodiment adopts figure 1 The process flow shown for Bayer process red mud is as follows:

[0095] Prepare red mud raw materials;

[0096] The red mud raw material is dried to a moisture content below 5%, and finely ground. Select 1000g of red mud powder with particle size ≤ 1mm.

[0097] Put the above-mentioned red mud powder, 35g CaO and 60g water into the mixer, and mix together for 20 minutes; then put the mixture into the disc pelletizer to form the first pellet with a diameter of 12mm.

[0098] The first pellets were dried in a drying oven at 105°C for 24 hours, then sent to a roasting furnace, and fired for 15 minutes in an oxidizing atmosphere at 900°C to obtain oxidized pellets.

[0099] Send the metallized pellets into the air-based shaft furnace, pass in reducing gas with a temperature of about 1000°C, and reduce for 6 hours to obtain the metallized pellets.

[0100] The metallized pellets are cooled and crushed, then rubbed to ≤75 μm (passing throu...

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Abstract

The invention discloses a method for red mud reduction by adopting a gas-based shaft furnace. The method comprises the following steps: preparing red mud powder; mixing the red mud powder, CaO and water to prepare a first pellet; drying the first pellet, and roasting the dried first pellet into an oxidization pellet; feeding the oxidization pellet in the gas-based shaft furnace for reduction to obtain a metallized pellet; cooling, crushing and wet-grinding the metallized pellet, and then magnetic separation is carried out to obtain a magnetic substance and magnetic separation slag; and adopting the magnetic substance for steelmaking. According to the invention, the gas-based shaft furnace is adopted for red mud reduction without metallurgical coke, coking coal is not consumed, the technological processes are few, the coking step is eliminated, energy consumption of a system is reduced, and emission of pollutant is also reduced. The technology is simple and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for gas-based reduction treatment of red mud. Background technique [0002] Red mud is a by-product produced during the production of alumina. At present, there is no effective way to deal with red mud, and it is mainly stored by stacking. At present, the stacking volume of red mud in our country exceeds 200 million tons. The stacking and disposal of a large amount of red mud not only does not make full use of resources, but also has an adverse impact on the ecological environment. [0003] Limited by the chemical composition of red mud, there is no precedent for industrial application so far, and the research on red mud is only in the laboratory stage. [0004] Gas-based shaft furnace ironmaking technology is a new type of ironmaking technology, which has the advantages of strong raw material adaptability and environmental friendliness. Gas-based shaft ...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/248C22B21/00
CPCC22B1/02C22B1/248C22B21/02Y02P10/20
Inventor 陈士朝边妙莲马冬阳孙辉曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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