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A method for synergistic recovery of red mud and desulfurization ash, filler, gelling material and preparation method

A technology of cementitious material and desulfurization ash, which is applied in the field of industrial waste slag resource utilization, and can solve problems such as threats to the stability of building materials, unstable physical and chemical properties, and oxidation.

Active Publication Date: 2021-04-20
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CaSO in wet state 3 The physical and chemical properties are very unstable, and it is extremely easy to oxidize in the air, forming a stable, dense structure, calcium sulfate (CaSO 4 ) as the main component of the oxidation product layer
Therefore, when the sintered flue gas desulfurization ash is used as the raw material for the preparation of building materials such as cement concrete, it will be 3 The hydration reaction produces crystal water, which leads to slight expansion of building materials and poses a threat to the stability of building materials

Method used

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  • A method for synergistic recovery of red mud and desulfurization ash, filler, gelling material and preparation method

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Embodiment 1

[0040] This embodiment provides a method for synergistic recovery of red mud and desulfurization ash. Process flow chart reference figure 1 shown. The red mud in this embodiment is Bayer process red mud. After testing, the iron grade TFe in the Bayer process red mud is 50%, and it also contains the following components in weight percentage: Al 2 o 3 20%, SiO 2 15%, Na 2 O 5%, TiO 2 10%.

[0041] CaO and Ca(OH) in desulfurization ash2 The sum of the mass percentages is 40%, CaSO 3 The mass percentage is 50%, and the rest are impurities, the particle size is less than 45 μm, and the moisture is less than 1%.

[0042] The method for synergistic recovery of red mud and desulfurization ash comprises the following steps:

[0043] (1) Carry out plate and frame pressure filtration to the Bayer process red mud to a moisture content of 25%. The Bayer process red mud after pressure filtration is then crushed to a particle size of less than 4mm by a crusher.

[0044] (2) Mix...

Embodiment 2

[0050] This embodiment provides a method for synergistic recovery of red mud and desulfurization ash. The red mud in this embodiment is Bayer process red mud. After testing, the iron grade TFe in the Bayer process red mud is 60%, and it also contains the following components in weight percentage: Al 2 o 3 30%, SiO 2 5%, Na 2 O 3%, TiO 2 2%.

[0051] CaO and Ca(OH) in desulfurization ash 2 The sum of the mass percentages is 30%, CaSO 3 The mass percentage is 40%, and the rest is impurities, the particle size is less than 45 μm, and the moisture is less than 1%.

[0052] The method for synergistic recovery of red mud and desulfurization ash comprises the following steps:

[0053] (1) Carry out plate and frame pressure filtration to the Bayer process red mud to a moisture content of 30%. The Bayer process red mud after pressure filtration is then crushed to a particle size of less than 4mm by a crusher.

[0054] (2) Mix the crushed red mud and desulfurization ash at a...

Embodiment 3

[0060] This embodiment provides a method for synergistic recovery of red mud and desulfurization ash. The red mud in this embodiment is Bayer process red mud. After testing, the iron grade TFe in the Bayer process red mud is 60%, and it also contains the following components in weight percentage: Al 2 o 3 15%, SiO 2 15%, Na 2 O 5%, TiO 2 5%. The particle size of the red mud raw material is 2-6mm, and the water content is lower than 20%.

[0061] CaO and Ca(OH) in desulfurization ash 2 The sum of the mass percentages is 30%, CaSO 3 The mass percentage is 60%, the rest is impurities, the particle size is less than 45μm, and the moisture is less than 1%.

[0062] The method for synergistic recovery of red mud and desulfurization ash comprises the following steps:

[0063] (1) Mix red mud and desulfurization ash at a mass ratio of 3:1 through a metering pump.

[0064] (2) Send the compatible mixture to the rotary kiln and bake at 600°C for 3h.

[0065] (3) After the c...

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Abstract

The invention discloses a method for synergistically recovering red mud and desulfurized ash, a filler, a cementitious material and a preparation method, and relates to the technical field of resource utilization of industrial waste residues. It includes the following steps: calcining after mixing red mud and desulfurized ash. The method utilizes the intermediate product red mud and solid waste desulfurization ash in the alumina production process for calcination, the iron oxide in the red mud has the characteristics of catalytic oxidation, and the iron oxide can oxidize the calcium sulfite in the desulfurization ash to calcium sulfate, The iron oxide itself is reduced to magnetite. The magnetite produced can be used for steel smelting and other purposes. The method can consume a large amount of red mud, which not only realizes the cost reduction and efficiency increase of steel itself, but also solves the problem of red mud discharge and treatment, and improves the economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of resource utilization of industrial waste residues, in particular to a method for synergistically recovering red mud and desulfurization ash, a filling material, a gelling material and a preparation method. Background technique [0002] Red mud is the waste residue produced during the production of alumina by alumina companies using bauxite. It is called red mud or red mud because it is rich in iron oxide and has a red mud shape. According to the statistics of the International Alumina Association, my country's alumina production has shown a blowout growth in the past 10 years, and the annual alumina production has increased from 8.51 million tons in 2005 to 58.97 million tons in 2015. Followed by a large amount of red mud production, according to incomplete estimates, the average production of 1t of alumina, will produce 1-2t of red mud. In recent years, China's annual discharge of red mud has exceeded 5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/04C04B18/06C04B28/14C22B1/02
CPCC04B20/04C04B28/144C04B40/0046C22B1/02C04B18/0409C04B18/062C04B7/00C04B18/141C04B18/08C04B18/142C04B22/145Y02W30/91Y02P10/20
Inventor 郭华军邵雁向浩刘子豪朱飞张浩浩聂海金万磊
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY