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Coal ash-iron tailing based geopolymer fiber reinforced material and preparation method thereof

A fiber-reinforced material and geopolymer technology, applied in the field of new green inorganic gel materials, can solve the problems of unfavorable polycondensation reaction, reduction of gel phase, low activity, etc., and achieve the advantages of easy availability of raw materials, low cost and high economic value Effect

Inactive Publication Date: 2019-07-09
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also successful preparations of geopolymers using blast furnace slag, converter slag, calcium tailings, volcanic ash, shale, Bayer process red mud, waste glass, rice husk ash and straw ash as solid raw materials, but the materials with low activity Mineral components are combined in an amorphous form, and Si and Al are difficult to dissolve in an alkaline environment, which is not conducive to the subsequent polycondensation reaction and reduces the formation of a gel phase

Method used

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  • Coal ash-iron tailing based geopolymer fiber reinforced material and preparation method thereof
  • Coal ash-iron tailing based geopolymer fiber reinforced material and preparation method thereof
  • Coal ash-iron tailing based geopolymer fiber reinforced material and preparation method thereof

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Effect test

Embodiment 1

[0058] This embodiment provides a preparation method based on fly ash-iron tailings geopolymer basalt fiber reinforced material, including:

[0059] (1) Preparation of solid raw materials: iron tailings were taken, dried in a drying oven at 105°C for 3 hours, dehydrated, ground, sieved with a 150-mesh sieve, and particles with a particle size of ≤50 μm accounted for more than 98%. Take secondary fly ash with a particle size of ≤200 μm, calcinate in a resistance furnace at 800°C for 2 hours, and cool to obtain fly ash for use. According to SiO 2 / Al 2 o 3 The molar ratio is 2.8, take 2197.12g of iron tailings, 2602.88g of fly ash, and a total mass of 4800g, and mix them uniformly to obtain solid raw materials. After mixing evenly, add 4-8mm basalt chopped fibers with a volume of 0.5% of the slurry and stir evenly to obtain a composite slurry.

[0060] (2) Preparation of composite base activator: according to SiO 2 / Na 2 The mol ratio of O is the proportioning of 1.6, gets...

Embodiment 2

[0066] This embodiment provides a preparation method based on fly ash-iron tailings geopolymer basalt fiber reinforced material, including:

[0067] (1) Preparation of solid raw materials: iron tailings were taken, dried in a drying oven at 115°C for 2 hours, dehydrated, ground, and sieved with a 100-mesh sieve. Particles with a particle size of ≤50 μm accounted for more than 74%. Take secondary fly ash with particle size ≤ 200μm, according to SiO 2 / Al 2 o 3 With a molar ratio of 3.2, take 2856.96g of iron tailings, 1943.04g of fly ash, and a total mass of 4800g, and mix them uniformly to obtain solid raw materials.

[0068] (2) Preparation of composite base activator: according to SiO 2 / Na 2 The mol ratio of O is the proportioning of 1.6, gets powdery sodium hydroxide 313.32g, water glass 2346.56g, mixes. According to H 2 O / Na 2 O molar ratio is that the proportioning of 8 adds 275.2g deionized water and stirs and obtains composite alkali activator.

[0069] (3) Slu...

Embodiment 3

[0074] This embodiment provides a preparation method based on fly ash-iron tailings geopolymer basalt fiber reinforced material, including:

[0075] (1) Preparation of solid raw materials: iron tailings were taken, dried in a drying furnace at 110° C. for 2 hours, dehydrated, ground, sieved with a 150-mesh sieve, and particles with a particle size of ≤50 μm accounted for more than 98%. Take secondary fly ash with particle size ≤200μm. According to SiO 2 / Al 2 o 3 When the molar ratio is 3.0, take 2549.44g of iron tailings, 2250.56g of fly ash, and a total mass of 4800g, and mix them uniformly to obtain solid raw materials.

[0076] (2) Preparation of composite base activator: according to SiO 2 / Na 2 The molar ratio of O is the proportioning of 1.6, gets powdery sodium hydroxide 417.92g, water glass 3132.16g, mixes. According to H 2 O / Na 2 O molar ratio is that the proportioning of 11 adds 1048.64g deionized water, stirs and obtains composite alkali activator.

[0077...

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Abstract

The invention relates to a preparation method of a coal ash-iron tailing based geopolymer fiber reinforced material. The preparation method comprises the following steps: taking iron tailings and coalash as main solid raw materials and using characteristics of high aluminum content of coal ash to adjust the molar ratio of Si / Al in raw materials, mixing solid raw materials with a composite alkaliactivator to prepare slurry, adding a reinforced fiber material to obtain a composite slurry, injecting the composite slurry into a mold, carrying out sealing and curing, carrying out demolding, and then carrying out curing to obtain a finished product. The geopolymer material disclosed by the invention has a special three-dimensional network structure, is high in compression resistance and bending strength, good in corrosion resistance, high in durability and good in high-temperature resistance, and can be applied to the fields of construction, automobiles, aviation, casting metallurgy, waterand soil protection, engineering emergency repair and the like. Due to the fact that the raw materials are rich in source and low in cost, the process is simple, green and environmentally friendly, energy consumption and carbon emission are avoided, comprehensive resource utilization of iron tailings and coal ash is realized, and important significance is achieved for sustainable development, energy conservation and emission reduction of mining enterprises and thermoelectric enterprises.

Description

technical field [0001] The invention relates to the fields of mineral resources, comprehensive utilization of industrial waste and novel green inorganic gel materials, in particular to a fly ash-iron tailings-based geopolymer fiber reinforced material and a preparation method thereof. Background technique [0002] By far the biggest problem facing industry in terms of waste disposal is how to safely and efficiently dispose of by-products such as waste water, sludge and the large quantities of fly ash produced during the combustion of coal for thermal power generation. At present, in the comprehensive utilization of solid waste, more and more attention has been paid to converting some solid waste rich in Si and Al into geopolymers. Iron tailings are rich in two elements, Si and Al. Using iron tailings as the main raw material to produce geopolymers can not only alleviate the ecological problems caused by the stockpiling of iron tailings, but also contribute to the sustainable...

Claims

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Application Information

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IPC IPC(8): C04B28/00B28B1/52
CPCB28B1/52C04B28/006C04B2201/50C04B14/4643Y02P40/10
Inventor 赵宇轩汪应玲罗绍华孙利军董琳陈帆
Owner 东北大学秦皇岛分校
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