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Fly ash and red mud geopolymer material and preparation method thereof

A geopolymer and fly ash technology, applied in cement production, etc., can solve the problems of inability to popularize production and high cost of technology input, and achieve the effect of low cost and no fuel consumption

Pending Publication Date: 2021-07-23
中铝山西新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current research has the following problems: first, these technologies have high input costs, and second, there is no fully mature technology that can be produced industrially
Enterprises without papermaking black liquor will not be able to promote production

Method used

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  • Fly ash and red mud geopolymer material and preparation method thereof

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Effect test

preparation example Construction

[0019] The preparation method of fly ash and red mud geopolymer material comprises the following steps:

[0020] (1) Mix the red mud, fly ash, lime and additives in the cementitious material according to the mass ratio of (10-60): (30-60): (5-30): (0.5-5) and then ball mill , to obtain powder after ball milling; the powder after ball milling all passed through a 60-mesh sieve and the remaining amount when passing through a 100-mesh sieve was less than or equal to 10%.

[0021] (2) The ball-milled powder and aggregate are mixed according to the mass ratio of 1: (0.2-1), then mixed with water, then pressurized, steamed and cured to obtain fly ash and red mud geopolymer materials, powder The coal ash and red mud geopolymer materials have a flexural strength of 3MPa-6MPa and a compressive strength of 25MPa-30MPa.

Embodiment 1

[0023] Mix 235g of red mud, 470g of fly ash, 188g of slaked lime, and 47g of desulfurized gypsum, and then add them to a ball mill for ball milling to obtain a ball-milled powder; when the ball-milled powder passes through a 100-mesh sieve, the remaining amount is less than or equal to 10% .

[0024] Mix the ball-milled powder with 940g of river sand and 225g of water evenly, and then pressurize the mixed material with a pressure of 15MPa to form it. After forming, put it into the curing box and steam it at 80°C for one day. After curing, put it at room temperature Under curing for 28 days, fly ash and red mud geopolymer materials were obtained. After testing, the 7-day flexural strength of the fly ash and red mud geopolymer material is 3.75MPa, the compressive strength is 18.5MPa, the 28-day flexural strength is 4.5MPa, and the compressive strength is 28.9MPa.

Embodiment 2

[0026] Mix 260g of red mud, 520g of fly ash, 208g of slaked lime, and 52g of desulfurized gypsum, and then add them to a ball mill for ball milling to obtain a ball-milled powder; when the ball-milled powder passes through a 100-mesh sieve, the remaining amount is less than or equal to 10% .

[0027] Mix the ball-milled powder with 559g of river sand and 282g of water evenly, then pressurize the mixed material with a pressure of 10MPa, and put it into a curing box for steam curing at 80°C for one day. After curing, put it at room temperature Under curing for 28 days, fly ash and red mud geopolymer materials were obtained. After testing, the 7-day flexural strength of the fly ash and red mud geopolymer material is 3.45MPa, the compressive strength is 17.6MPa, the 28-day flexural strength is 4.25MPa, and the compressive strength is 27.8MPa.

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Abstract

The invention discloses a fly ash and red mud geopolymer material which comprises a cementing material and an aggregate, the cementing material comprises the following components in percentage by mass: 10-60% of red mud, 30-60% of fly ash, 5-30% of lime and 0.5-5% of an additive, and the addition amount of the aggregate is 20-100% of the mass of the cementing material. The preparation method comprises the following steps: (1) blending red mud, fly ash, lime and an additive in the cementing material according to a mass ratio of (10-60): (30-60): (5-30): (0.5-5), and then carrying out ball milling to obtain ball-milled powder; and (2) mixing the ball-milled powder and the aggregate according to a mass ratio of 1: (0.2-1), adding water, stirring, carrying out pressure forming, and carrying out steam curing to obtain the fly ash and red mud geopolymer material. The method is free of burning, high in strength and low in cost, and the fly ash and the red mud can be comprehensively utilized.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of building materials and industrial solid waste, and in particular relates to a fly ash and red mud geopolymer material and a preparation method thereof. Background technique [0002] Red mud is the leaching residue after leaching bauxite with alkali in alumina production. The high alkali content in red mud is precisely because of its high alkalinity, which makes the comprehensive utilization of red mud a difficult problem in the world. A large amount of red mud is piled up, which brings potential safety hazards. The world's annual red mud discharge is 120 million tons (more than 50 million tons in China), and the pH value is 11.0-12.0, which is strongly corrosive to organisms and metal materials. The alkalinity of red mud attached liquid is as high as 26348mg / L (public water channels require 30-400mg / L), which increases the pH value of the surrounding water body and causes ser...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B12/00C04B40/02
CPCC04B28/006C04B12/005C04B40/024C04B2201/50C04B14/06C04B18/16Y02P40/10
Inventor 薛峰平董鑫秀杜亚琦郭晋梅胡红娟
Owner 中铝山西新材料有限公司
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