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Innocent treatment and resource utilization method for red mud

A technology for harmless treatment of red mud, applied in the direction of sustainable waste treatment, iron oxide, magnesium hydroxide, etc., can solve red mud pollution and other problems

Inactive Publication Date: 2013-05-01
吕富华 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0028] To sum up: so far, the patents obtained at home and abroad are still in a partial and scattered state, and a method to completely solve red mud pollution has not been found

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0035] specific implementation plan

[0036]Red mud obtained from different processes in alumina production has differences in chemical composition and phase composition. Using polarizing microscope, scanning electron microscope and other means to determine the mineral composition of red mud, it is believed that there are mainly aragonite and calcite, followed by opal, gibbsite, goethite, a small amount of titanium minerals, siderite, sodium aluminate and caustic alkali . Roasting and acid leaching are used to dissolve metal oxides in the red mud and reduce the alkalinity of the red mud. Step by step recovery of metal oxides and salt products from the solution, a treatment method for making sintered bricks from the residue, a method for harmless red mud treatment and resource utilization, characterized in that the brick adobe manufacturing process is red mud residue After the magnetic separation process, the iron concentrate powder containing total iron ≥ 55% can be obtained...

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Abstract

An innocent treatment and resource utilization method for red mud. Red mud is a waste slag discharged from a production process of alumina treatment; and a large amount of strong alkali substances contained in the slag is a major cause of environmental pollution. A red mud treatment project belongs to the field of environmental technology, and studies on the subjects of environmental science and technology, environmental engineering and solid pollution control engineering. The red mud is roasted by high temperature and subjected to acid leaching treatment to separate metals with recycling value in the red mud, such as aluminum and iron; the remaining neutral red mud slag is added with coal gangue, and sintered at 950-1100 DEG C (or added with an adhesive); and an obtained brick has compressive strength reaching 1-15 MPa, and quality completely meeting requirements of ''sintering common brick'' in GB-5101-2003. The method is suitable for treatment of red mud discharged from different production processes.

Description

technical field [0001] The invention relates to a method for harmless red mud treatment and resource utilization. In particular, the treatment of red mud belongs to the field of environmental technology, and the research subjects are environmental science and technology, environmental engineering and solid pollutant control engineering. [0002] Red mud is the waste residue formed in the production of alumina from bauxite. The huge volume of red mud slurry and the strong alkali corrosiveness of attached liquid are the root causes of continuous pollution caused by red mud stacking to the surrounding environment. The environmental impact caused by red mud stacking not only occupies a large amount of land, but also the infiltration of strong alkali and sulfate in the leaching solution (attached solution) will pollute the groundwater, change the nature and structure of the soil, and cause a large area of ​​soil to be alkalized and hardened. use. [0003] A method for harmless r...

Claims

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Application Information

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IPC IPC(8): C01G49/06C01F7/02C01F5/14C01F11/24C01D3/04C04B30/00C04B28/00C04B26/00C04B18/30C22B3/06C22B3/44C22B1/02
CPCY02W30/91Y02P10/20
Inventor 吕富华钟大林傅显诚
Owner 吕富华
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