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Autoclaved red mud brick and preparation method thereof

A red mud brick and autoclaved technology, which is applied in the field of autoclaved red mud brick and its preparation, can solve the problems of high alkali content, frosting, etc., and achieve the effect of increasing the amount of cementing material, excellent weather resistance and durability

Active Publication Date: 2011-12-14
四川方大新型建材科技开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, when the Bayer process red mud is used to make bricks, due to the high alkali content of the Bayer process red mud, the alkali will be precipitated as a compound in the wall bricks and cause severe frosting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] Preparation method of autoclaved red mud brick

[0020] The dry weight percentage is 35-43% Bayer process red mud, 12-20% cementing material, and 27-35% active material for batching, add water to stir and digest, and then add raw materials with a dry weight percentage of 2-10% blast furnace Slag powder is mixed and milled, pressed into shape and cured with saturated steam; the cementing material is at least one of quicklime, cement, gypsum, and carbide mud; the active material is silica sand, fly ash, slag, granular At least one of blast furnace slag, phosphorus slag or artificial sand, the active material requires SiO 2 >45%; the digestion time is at least 1.5 hours, and water needs to be added during the mixing and rolling process, so that the moisture content of the billet is 8-10%; the saturated steam curing refers to sending the pressed brick adobe into In the autoclave, the air in the autoclave is exhausted and saturated steam with a gauge pressure of 1.5MPa is i...

Embodiment 1

[0024] Embodiment 1 prepares the autoclaved red mud brick of the present invention

[0025] 1 Weigh 1000kg of dry red mud, 250kg of quicklime powder, 200kg of cement, 600kg of silica sand, and 250kg of fly ash.

[0026] 2 Put the above materials into the blender, add 250kg of water, stir for 2 minutes, then put them into the digestion bin for 2 hours.

[0027] 3. Add 200Kg of neutral blast furnace slag powder to the discharged material in the digestion bin, and send it into the planetary wheel mill mixer for 3 minutes of mixing and grinding, compacting, and adding water to make the mixture contain 10% water.

[0028] 4. Put the blanks in step 3 into the HF1100 automatic brick press and press them into adobes, and then use the MD64 automatic adobe stacker to remove the adobes from the brick press according to a certain stacking method and stack them on the autoclaved trolley.

[0029] 5 Arrange the autoclaved trolleys that have been stacked with bricks into a row, and send the...

Embodiment 2

[0037] Embodiment 2 prepares the autoclaved red mud brick of the present invention

[0038] 1 Weigh dry red mud 1075kg, quicklime 200kg, cement 200kg, silica sand 850kg

[0039] 2. Send the above materials into a special mixer for stirring, add 250kg of water while stirring, and after stirring for 3 minutes, send the mixture into the digestion bin for 2.5 hours to digest.

[0040] 3 Add 175kg of acidic blast furnace slag powder to the mixed material released from the digestion bin, and send it into the planetary wheel mill mixer for 3 minutes of mixing and grinding, compact and add water until the mixed material becomes a billet with a water content of 9%. .

[0041] 4 Send the blanks prepared in step 3 into the HF1100 automatic hydraulic brick press and press them into adobes, and then take the adobes from the press and stack them on the autoclaved trolley by the MD64 automatic adobe stacker according to the prescribed stacking method superior.

[0042] 5 Arrange the autocla...

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Abstract

The invention discloses an autoclaved red mud brick and a preparation method thereof, belonging to the field of building materials and solving the problem that alkali can be precipitated in a form of compound to cause efflorescence phenomenon resulting from high alkaline content in the Bayer process red mud brick in the prior art. The autoclaved red mud brick comprises the following raw materials in percentage by dry weight: 35 to 43 percent of Bayer process red mud, 12 to 20 percent of cementing material, 2 to 10 percent of blast furnace slag and 27 to 35 percent of active material. The cementing material is at least one of calcined lime, cement, gypsum or carbide slurry; the active material is at least one of silica sand, pulverized fuel ash, slag, granulated blast furnace slag, phosphorous slag or artificial sand; and SiO2 in the active material is more than 45%. The autoclaved red mud brick is mainly used for making bricks from Bayer process red mud in an autoclaved way.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an autoclaved red mud brick and a preparation method thereof. Background technique [0002] Red mud is the industrial solid waste discharged from aluminum smelting enterprises after extracting alumina from bauxite. For every ton of alumina produced, more than 1.5 tons of red mud are produced. At present, the red mud discharged in my country is mostly Bayer red mud, its pH value is > 10, and its main chemical composition is: SiO 2 3-20%, Al 2 o 3 10-20%, Fe 2 o 3 30-60%, CaO 2-8%, Na 2 O 2-10%, TiO 2 Trace -10%, loss on ignition 10-15%. Because there is no effective industrial treatment method both at home and abroad at present, only to pile up or discharge into the sea has become a worldwide environmental protection problem. Dam building not only occupies a large amount of land, but also pollutes soil, water sources, and the atmosphere, and endangers th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/32
Inventor 黄华大方炎章
Owner 四川方大新型建材科技开发有限责任公司
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