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Method for preparing bottom slag-based geopolymer of high-temperature resistant circulating fluid bed

A circulating fluidized bed and polymer technology, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve unsuitable problems and achieve excellent high temperature resistance and excellent mechanical properties

Inactive Publication Date: 2011-11-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the structure of traditional cement is destroyed at around 500°C, and most organic polymers soften or burn at 400-600°C, these two materials are not suitable for high temperature or fire hazards.

Method used

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  • Method for preparing bottom slag-based geopolymer of high-temperature resistant circulating fluid bed
  • Method for preparing bottom slag-based geopolymer of high-temperature resistant circulating fluid bed
  • Method for preparing bottom slag-based geopolymer of high-temperature resistant circulating fluid bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) The CFBC bottom slag raw material is put into a ball mill for ball milling, so that the volume average particle diameter D[4,3] is reduced to 8-50 microns.

[0016] 2) Use solid potassium silicate and potassium hydroxide to prepare a potassium silicate activator solution with a modulus of 0.9 and a concentration of 25.0%.

[0017] 3) Mix the prepared potassium silicate activator solution with the finely ground CFBC bottom slag at a liquid / solid ratio of 0.35 and stir evenly. After ultrasonic treatment for 5 minutes, put it into a steel mold. The mold containing the reactants was placed on an electric shaker for 10 minutes to remove air bubbles, and then the mold was sealed.

[0018] 4) Move the sealed mold into a constant temperature curing box, and release the mold after curing at 60° C. for 24 hours. The samples after demoulding were maintained at 20°C for 69 days.

[0019] 5) Dry the samples that have reached the curing age in an electric blast oven at 105°C to ...

Embodiment 2

[0021] 1) The CFBC bottom slag raw material is put into a ball mill for ball milling, so that the volume average particle diameter D[4,3] is reduced to 8-50 microns.

[0022] 2) Use solid sodium silicate and sodium hydroxide to prepare a sodium silicate activator solution with a modulus of 1.2 and a concentration of 43.5%.

[0023] 3) Mix the prepared sodium silicate activator solution with the finely ground CFBC bottom slag at a liquid / solid ratio of 0.50 and stir evenly. After ultrasonic treatment for 3 minutes, put it into a steel mold. The mold containing the reactants was placed on an electric shaker for 2 minutes to remove air bubbles, and then the mold was sealed.

[0024] 4) Move the sealed mold into a constant temperature curing box, and release the mold after curing at 40° C. for 24 hours. The samples after demolding were kept at 40°C for 13 days.

[0025] 5) Dry the samples that have reached the curing age in an electric blast oven at 105°C to prepare the CFBC bot...

Embodiment 3

[0027] 1) The CFBC bottom slag raw material is put into a ball mill for ball milling, so that the volume average particle diameter D[4,3] is reduced to 8-50 microns.

[0028] 2) Use solid sodium silicate and potassium hydroxide to prepare a sodium silicate-potassium composite activator solution with a modulus of 1.5 and a concentration of 55.0%.

[0029] 3) Mix the prepared sodium silicate-potassium composite activator solution with the finely ground CFBC bottom slag at a liquid / solid ratio of 0.85 and stir evenly. After ultrasonic treatment for 2 minutes, put it into a steel mold. The mold containing the reactants was placed on an electric shaker for 3 minutes to remove air bubbles, and then the mold was sealed.

[0030] 4) Move the sealed mold into a constant temperature curing box, and release the mold after curing at 60° C. for 12 hours. The samples after demolding were kept at 60°C for 6 and a half days.

[0031] 5) Dry the samples that have reached the curing age in an...

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Abstract

The invention discloses a method for preparing a bottom slag-based geopolymer of a high-temperature resistant circulating fluid bed, comprising the following steps of: firstly treating CFBC bottom slags to a certain grain diameter through machinery; then mixing the treated bottom slags with an alkaline exciting agent solution in a certain ratio and evenly stirring; pouring into a mould after ultrasonic treatment; vibrating for a period of time on a dynamoelectric vibrating table, and then sealing the mould and transferring to a constant-temperature curing box; and curing for several hours-24 hours at the room temperature-90 DEG C and then demoulding; and continuously curing demoulded samples to scheduled stage under a certain temperature. Compared with the traditional silicate cement materials, the geopolymer material prepared by the invention has good mechanical property and high temperature resistance, and the compressive strength in 7 days exceeds 50MPa; moreover, the appearance and the microstructure are not obviously damaged after the material is calcined for 2 hours at the high temperature of 800 DEG C or 1050 DEG C; compared with the material before being calcined, the compressive strength of the calcined material is increased in various degrees, and the highest compressive strength exceeds 65MPa.

Description

technical field [0001] The invention relates to an inorganic polymer material prepared from industrial waste as a raw material, in particular to a method for preparing a high-temperature-resistant circulating fluidized bed (CFBC) bottom slag-based polymer. The method uses CFBC bottom slag as all or part of the silicon-aluminum raw material, undergoes mechanical pretreatment, undergoes polycondensation and solidification under the action of an alkaline activator, and prepares the CFBC bottom slag base polymer. Background technique [0002] Geopolymers are a kind of inorganic polymer materials with amorphous three-dimensional network silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron structures, which have some advantages of both inorganic materials and organic polymers. Since the structure of traditional cement is destroyed at about 500°C, and most organic polymers soften or burn at 400-600°C, these two materials are not suitable for high temperature or fire hazards. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/06
CPCY02W30/91
Inventor 徐辉李琴沈立锋翟建平
Owner NANJING UNIV