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An integrated preparation method for iron separation from red mud and its tailings-based foamed lightweight wall material

A technology of red mud and tailings, applied in chemical instruments and methods, ceramic products, and other household appliances, can solve the problems of high cost of valuable metals, efflorescence of fired bricks, secondary pollution, etc., and achieve great practical value , simple preparation process and wide application prospects

Active Publication Date: 2018-01-05
朱锦平 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research on the comprehensive utilization of red mud mainly focuses on the extraction of valuable metals, the use of environmental restoration materials, engineering plastic fillers, and the production of sintered bricks. Restoration will cause secondary pollution, pan-alkali phenomenon in the production of fired bricks, etc.
The content of iron-containing mineral phases such as hematite and limonite in Bayer process red mud generally exceeds 30%. Preparation of building materials after drying treatment, resulting in the loss of activity of mineral components with gelling activity formed in the roasting and magnetization stage of red mud

Method used

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  • An integrated preparation method for iron separation from red mud and its tailings-based foamed lightweight wall material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] An integrated method for preparing iron from red mud and its tailings-based foamed lightweight wall material, the specific implementation steps are as follows:

[0017] (1) Iron selection from red mud

[0018] Weigh 50 parts of red mud, 30 parts of coal gangue, 10 parts of limestone, and 10 parts of coke powder by weight on a dry basis, and fully and uniformly mix them in a mixer; add water, granulate, and dry; Roast at 1050°C for 2 hours, cool naturally to room temperature, and grind to 200 mesh; add water and stir to prepare a 20 wt% slurry; send the prepared slurry to a magnetic separator to select iron, and the magnetic induction is 1600Gs.

[0019] (2) Red mud slag liquid separation

[0020] The red mud tailings slurry after roasting and magnetic separation is filtered, the filtered red mud tailings are sent to the mixer, the filtrate is introduced into the filtrate pool for reuse, part of it is sent to the foaming machine for foaming, and part of it is used to pr...

Embodiment 2

[0025] An integrated method for preparing iron from red mud and its tailings-based foamed lightweight wall material, the specific implementation steps are as follows:

[0026] (1) Iron selection from red mud

[0027] Weigh 70 parts of red mud, 10 parts of coal gangue, 5 parts of limestone, and 15 parts of coke powder by weight on a dry basis, and fully and uniformly mix them in a mixer; add water, granulate, and dry; Roast at 1200°C for 4 hours, cool naturally, and grind to 200 mesh; add water to prepare a 40 wt% slurry; send the prepared slurry to a magnetic separator for iron selection, and the magnetic induction is 2800Gs.

[0028] (2) Red mud slag liquid separation

[0029] The red mud tailings slurry after roasting and magnetic separation is filtered, the filtered red mud tailings are transported to the mixer, the filtrate is introduced into the filtrate pool for reuse, part of it is sent to the foaming machine for foaming, and part of it is used to prepare new iron sele...

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Abstract

The invention discloses an integrated preparation method for iron separation from red mud and its tailing slag-based foamed light wall material, which belongs to the field of comprehensive utilization of industrial solid waste and new ecological building materials. It specifically includes (1) red mud iron selection, (2) red mud slag liquid separation, (3) preparation and molding of light wall material slurry. In the present invention, by adding coal gangue, limestone and coke powder into the red mud and then carrying out magnetization roasting, the non-magnetic hematite and limonite in the red mud are transformed into magnetic metal iron and Fe3O4, and at the same time, the coal The introduction of gangue and limestone forms C3S, C2S and other phases with gelling activity during the roasting process, which has the coagulation characteristics of cement. The invention is ecological and environmentally friendly, and the preparation process is simple. Existing equipment can be used for production, and it is effective The cost is reduced, and the full quantification and zero-emission comprehensive utilization of red mud is realized, which has great practical value and broad application prospects.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial solid waste and new ecological building materials, and in particular relates to an integrated preparation method for iron separation from red mud and its tailings-based foamed light wall material. Background technique [0002] In 2005, the production of red mud in my country was 10 million tons, and in 2010, it was 30 million tons. It is estimated that the production will reach 35 million tons in 2015, and the cumulative stockpiles will reach more than 300 million tons. The rapid development of electrolytic aluminum, alumina and other related industries has led to a continuous increase in the accumulation of red mud, causing serious ecological problems such as groundwater, soil pollution, smog, and radioactivity exceeding the standard. Regrettably, the comprehensive utilization rate of red mud in 2010 was only 4% of the output in that year, and the utilization rate target at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00C04B28/00C04B20/02
CPCC04B20/023C04B28/00B09B5/00B09B3/25C04B18/08C04B18/141C04B38/08
Inventor 徐开东王继娜牛季收马先伟刘富玲朱凯杨欢李金刚
Owner 朱锦平
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