Autoclaved aerated concrete containing coal gangue and iron tailings and preparation method of autoclaved aerated concrete

A technology of autoclaved aeration and coal gangue, applied in the field of building wall materials, can solve the problems of polluting the environment, low comprehensive utilization rate, etc., and achieve the effects of reducing environmental pollution, improving recycling rate, and strong volcanic ash activity

Inactive Publication Date: 2021-10-22
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It also solves the technical problems related to the low comprehensive utilization rate of iron tailings and pollutes the environment, and realizes the sustainable utilization of industrial solid waste

Method used

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  • Autoclaved aerated concrete containing coal gangue and iron tailings and preparation method of autoclaved aerated concrete
  • Autoclaved aerated concrete containing coal gangue and iron tailings and preparation method of autoclaved aerated concrete

Examples

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preparation example Construction

[0042] A preparation method of autoclaved aerated concrete containing coal gangue and iron tailings, comprising the following steps:

[0043] Step 1, pulverizing the coal gangue to a particle size smaller than 2 mm. The powder is then dried and further ground using a ball mill to a specific surface area of ​​350-400 m 2 kg -1 of fine powder. Finally, the coal gangue samples were placed in a CD-1400X muffle furnace for vacuum calcination at five calcination temperatures, 500°C, 600°C, 700°C, 800°C, and 900°C for 1-2 hours, and then quenched in water. And the iron ore tailings are dried, and then crushed with a ball mill to obtain a specific surface area of ​​320-350m 2 kg -1 of fine powder.

[0044] Step 2. Mix the ground iron tailings, aluminum slag and coal gangue with water, add waste materials during the stirring process, control the dispersion of the slurry at 40-45mm, the specific gravity at 1.77-1.85, and the temperature at 35-40°C, stir The speed is 120~140r / min, ...

Embodiment 1

[0051] An iron tailings and coal gangue autoclaved aerated concrete, wherein dry materials: 20 parts of coal gangue, 17 parts of aluminum slag, 35 parts of iron tailings, 5 parts of cement, 10 parts of quicklime, and 5 parts of nano-scale silicon dioxide , 5 parts of metakaolin, 3 parts of waste materials; auxiliary materials: 0.16 parts of aluminum powder, 0.08 parts of foam stabilizer, 0.08 parts of polycarboxylate superplasticizer.

[0052] The preparation method of the above-mentioned iron tailings and coal gangue autoclaved aerated concrete block comprises the following steps:

[0053] Step 1, pulverizing the coal gangue to a particle size smaller than 2 mm. The powder was then dried and further ground using a ball mill to a specific surface area of ​​350 m 2 kg -1 of fine powder. Finally, the coal gangue samples were placed in a CD-1400X muffle furnace for vacuum calcination at five calcination temperatures, 500°C, 600°C, 700°C, 800°C, and 900°C, and then quenched in ...

Embodiment 2

[0060] An iron tailings and coal gangue autoclaved aerated concrete, wherein dry materials: 20 parts of coal gangue, 15 parts of aluminum slag, 30 parts of iron tailings, 4 parts of cement, 12 parts of quicklime, and 6 parts of nano-scale silicon dioxide , 8 parts of metakaolin, 5 parts of waste materials; auxiliary materials: 0.16 parts of aluminum powder, 0.08 parts of foaming agent, 0.09 parts of polycarboxylate superplasticizer.

[0061] The preparation method of the iron tailings autoclaved aerated concrete block is the same as that of Example 1.

[0062] With reference to GB / T11969-2020 "Autoclaved Aerated Concrete Performance Test Method" and GB / T10294-2008 "Determination of Steady-state Thermal Resistance and Related Properties of Thermal Insulation Materials with Protective Hot Plate Method" to test the performance of the autoclaved aerated concrete obtained in Example 2 Dry density is 520 kg / m 3 , the compressive strength is 4.6MPa, the drying shrinkage value is 0.4...

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Abstract

The invention belongs to the technical field of building wall materials, and particularly relates to autoclaved aerated concrete containing coal gangue and iron tailings and a preparation method of the autoclaved aerated concrete. The autoclaved aerated concrete containing the coal gangue and the iron tailings is prepared from the following raw materials in parts by weight: 5 to 30 parts of the coal gangue, 15 to 25 parts of aluminum slag, 30 to 55 parts of the iron tailings, 5 to 15 parts of nanoscale silicon dioxide, 5 to 15 parts of metakaolin, 10 to 15 parts of quick lime, 0 to 5 parts of cement and the balance of waste materials. Auxiliary materials include aluminum powder, a foam stabilizer and a water reducing agent. In the raw materials, the iron tailings and the coal gangue are used as siliceous materials, so that the environmental problem caused by solid waste stockpiling can be solved, waste is turned into wealth, and meanwhile, a good effect is achieved on the sustainable development of the society. The prepared concrete block has good physical and mechanical properties and durability, the product performance meets the national standard requirement, and 04-grade, 05-grade, 06-grade and 07-grade concrete blocks can be produced according to different proportions and process systems.

Description

technical field [0001] The invention belongs to the technical field of building wall materials, in particular to an autoclaved aerated concrete containing coal gangue and iron tailings and a preparation method thereof. Background technique [0002] Autoclaved aerated concrete blocks are made of siliceous materials and calcareous materials as the main raw materials, mixed with an air-generating agent, stirred with water, formed pores by chemical reaction, and processed by pouring molding, pre-cured cutting, autoclaved curing, etc. Made into a lightweight and porous new building wall material. [0003] Iron tailings are industrial solid wastes produced after iron ore processing, refining and sorting. At present, most iron ore enterprises choose to stack a large part of the tailings and wait for backfill treatment, and only a small part is used. According to statistics, iron tailings in my country The comprehensive utilization rate is only 7%. This not only takes up space and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/04C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B18/144C04B18/12C04B22/04C04B22/064C04B24/04C04B24/122C04B2103/302C04B14/062C04B14/106C04B38/02C04B38/0067
Inventor 宁宝宽张文馨刘剑平刘朋
Owner SHENYANG POLYTECHNIC UNIV
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