Method for directly reducing and recycling iron powder by red mud

A technology for reducing iron powder and recovering iron, applied in chemical instruments and methods, solid waste removal, magnetic separation, etc., can solve the problems of high grade, no process and formula report, etc., achieve less impurities, good economy, and reduce the environment pollution effect

Inactive Publication Date: 2020-07-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] From the result analysis of technical retrieval: the key of the present invention is to directly reduce the fine iron powder after the red mud magnetic separation, through three times of magnetic separation twice reduction in the process, finally obtain the high-purity reduced iron powder with high grade and few impurities, and Compared with the existing public documents, there is no process and formula report exactly the same as the content of "A Method for Direct Reduction of Red Mud and Recovery of Iron Powder" in the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for direct reduction of red mud to recover iron powder, the steps of which are:

[0042] (1) Grinding the solid residue after drying the red mud at 105°C for 48 hours in a ball mill, the grinding fineness is greater than 200 mesh;

[0043] (2) Pass the ground red mud through a weak magnetic separator to obtain red mud iron fine powder. The magnetic field strength of the magnetic separator is 1200Gs, and the magnetic separation time is 5min. At this time, the grade of iron fine powder is greater than 50% ;

[0044] (3) Accurately weigh the red mud, carbon-based compound, and catalyst according to the mass percentage content of red mud iron powder: carbon-based compound: catalyst = 80:80:15, and add various raw materials that have been weighed into the mixer , stirring at a speed of 250r / min for 10min;

[0045] (4) Add water of 5% of the total mass of raw materials into the mixer, and stir for 5 minutes at a speed of 200r / min; the uniformly stirred semi-finishe...

Embodiment 2

[0053] A method for direct reduction of red mud to recover iron powder, the steps of which are:

[0054] (1) Grinding the solid residue after drying the red mud at 95°C for 60 hours in a ball mill, the grinding fineness is greater than 200 mesh;

[0055] (2) Pre-select the ground red mud through a weak magnetic separator to obtain red mud iron powder. The magnetic field strength of the magnetic separator is 1200Gs, and the magnetic separation time is 5min. At this time, the grade of the iron powder is greater than 50 %;

[0056] (3) Accurately weigh the red mud, carbon-based compound, and catalyst according to the mass percentage content of red mud iron powder: carbon-based compound: catalyst = 50:50:10, and add various raw materials that have been weighed into the mixer , stirring at a speed of 250r / min for 10min;

[0057] (4) Add water of 5% of the total mass of raw materials into the mixer, and stir for 5 minutes at a speed of 200r / min; the uniformly stirred semi-finished...

Embodiment 3

[0065] A method for direct reduction of red mud to recover iron powder, the steps of which are:

[0066] (1) Grinding the solid residue after drying the red mud at 135°C for 36 hours in a ball mill, the grinding fineness is greater than 200 mesh;

[0067](2) Pass the ground red mud through a weak magnetic separator to obtain the red mud iron concentrate powder. The magnetic field strength of the magnetic separator is 1250Gs, and the magnetic separation time is 5min. At this time, the grade of the iron concentrate powder is greater than 50% ;

[0068] (3) Accurately weigh the red mud, carbon-based compound, and catalyst according to the mass percentage content of red mud iron powder: carbon-based compound: catalyst = 60:60:20, and add various raw materials that have been weighed into the mixer , stirring at a speed of 250r / min for 10min;

[0069] (4) Add water of 8% of the total mass of raw materials in the mixer, and stir for 8 minutes at a speed of 200r / min; the uniformly s...

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Abstract

The invention provides a method for directly reducing and recycling iron powder by red mud, and relates to the technical field of metallurgy and environmental protection. The method comprises the steps that the red mud is used as a main raw material, a carbon-based compound is used as a reducing agent, by matching with a catalyst, the red mud, the reducing agent and the catalyst are blended and pelletized according to a certain proportion, and reduction is carried out under a low-temperature condition. The prepared reduced iron powder is high in metallization ratio, the technology is simple, and the investment is less; and the problem of the utilization of bulk metallurgical solid waste such as the red mud is solved, so that high added-valve utilization is obtained, the environmental pollution is reduced, and good economic benefits, ecological and environmental benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical fields of metallurgy and environmental protection, in particular to a method for directly reducing red mud to recover iron powder. Background technique [0002] Red mud is the polluting alkaline solid waste discharged from the aluminum industry when extracting alumina. The particle diameter is generally 0.088-0.25mm and the density is 2700-2900kg / m 3 , bulk density is 800~1000kg / m 3 , with a melting point of 1200-1500°C. Its pH range is 10.29-11.83, which belongs to strong alkaline soil. The main minerals in red mud are calcite and aragonite, and opal (SiO 2 ·nH 2 O), gibbsite (Al(OH) 3 ), goethite (α-FeO(OH)) and other minerals, whose mineral composition is relatively complex. Due to its low metal content, it is not cost-effective to directly use red mud to recover valuable metals such as iron and aluminum. Therefore, when the output of red mud is small, the main treatment method is to use the red mud dam ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B02C17/10B03C1/02B22F9/24
CPCB02C17/10B03C1/02B09B3/00B22F9/24
Inventor 李灿华徐文珍黄贞益吴朝阳王雪松李明晖王昭然陈昆先李春松
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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