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Sludge incineration ash based geopolymer and preparation method thereof

A sludge incineration and polymer technology, applied in cement production and other directions, can solve the problems of limited life, damaged structure, low corrosion resistance, etc., and achieve the effect of extending service life and strong acid corrosion resistance.

Active Publication Date: 2018-04-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Constructing water channels, trails and cement floors in rural areas requires a large amount of cement products, and as a substitute for cement, geopolymers can be excited by strong alkali NaOH to obtain products with sufficient strength, but the solid phase components are easily mixed with SO 4 2- reaction, destroying the structure, and the NaOH excited product has a strong alkalinity and is easily corroded by acidic rainwater [2]
Sludge incineration ash contains a lot of SiO 2 and Al 2 o 3 , can be used as a raw material for synthesizing geopolymers, but using ordinary synthesis methods, excited by strong alkali, its corrosion resistance is too low and its life is limited

Method used

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  • Sludge incineration ash based geopolymer and preparation method thereof
  • Sludge incineration ash based geopolymer and preparation method thereof
  • Sludge incineration ash based geopolymer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] A sludge incineration ash-based geopolymer, the basic composition of which includes the following components by mass percentage:

[0031]

[0032] The preparation method is as follows: weigh the sludge incineration ash and metakaolin according to the formula amount, grind the two separately and pass through an 80 μm square hole sieve, and then mix with the formula amount of Ca(OH) 2 The three are mixed, roasted and activated at a temperature of 600°C for 1.5h, and the activated material is mixed with desulfurized gypsum (CaSO 4 2H 2 O) and KH 2 PO 4 The alkali activator obtained by mixing is activated, and the water-cement ratio of the total mixed material is controlled at 0.28. The mixed material is filled in a 40×40×160mm mold, pressed for 50s under a pressure of 15MP, and placed in a standard curing box (temperature After curing for 24 hours at about 25°C and humidity of about 90%, demoulding was carried out, followed by 7 days of humid heat curing at 80°C to o...

Embodiment 2

[0034] A sludge incineration ash-based geopolymer, the basic composition of which includes the following components by mass percentage:

[0035]

[0036]

[0037] The preparation method is as follows: weigh the sludge incineration ash and metakaolin according to the formula amount, grind the two separately and pass through an 80 μm square hole sieve, and then mix with the formula amount of Ca(OH) 2 The three are mixed, roasted and activated at a temperature of 600°C for 1.5h, and the activated material is mixed with desulfurized gypsum (CaSO 4 2H 2 O) and KH 2 PO 4 The alkali activator obtained by mixing is activated, and the water-cement ratio of the total mixed material is controlled at 0.28. The mixed material is filled in a 40×40×160mm mold, pressed for 50s under a pressure of 15MP, and placed in a standard curing box (temperature After curing for 24 hours at about 25°C and humidity of about 90%, demoulding was carried out, followed by 7 days of humid heat curing ...

Embodiment 3

[0039] A sludge incineration ash-based geopolymer, the basic composition of which includes the following components by mass percentage:

[0040]

[0041] The preparation method is as follows: weigh the sludge incineration ash and metakaolin according to the formula amount, grind the two separately and pass through an 80 μm square hole sieve, and then mix with the formula amount of Ca(OH) 2 The three are mixed, roasted and activated at 600°C for 2 hours, and the activated material is mixed with desulfurized gypsum (CaSO 4 2H 2 O) and KH 2 PO 4 The alkali activator obtained by mixing is activated, and the water-cement ratio of the total mixed material is controlled at 0.28. The mixed material is filled in a 40×40×160mm mold, pressed for 50s under a pressure of 15MP, and placed in a standard curing box (temperature After curing for 24 hours at about 25°C and humidity of about 90%, demoulding was carried out, followed by 7 days of humid heat curing at 80°C to obtain a certai...

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Abstract

The invention discloses a sludge incineration ash based geopolymer which comprises the following components in percentage by weight: 30-50% of sludge incineration ash, 10-30% of metakaolin, 8-10% of Ca(OH)2, 10-20% of desulfurization gypsum and 10-20% of KH2PO4. The invention further discloses a preparation method of the sludge incineration ash based geopolymer. By utilizing co-excitation of low alkalinity sulfate and KH2PO4, the alkalinity is low, so that the prepared geopolymer has high acid corrosion resistance, and the service life can be prolonged; in order to prevent from reducing the product strength due to low alkalinity, the sludge incineration ash, the metakaolin and Ca(OH)2 are subjected to roasting activation, so that unsaturated reactive bonds are formed on the surfaces of SiO2 and Al2O3, and the SiO2 and Al2O3 are reacted with the Ca(OH)2 to produce calcium silicate hydrate (C-S-H), calcium aluminate hydrate (C-A-H) and other gelling products. Therefore, the prepared geopolymer has high acid corrosion resistance and has the ability of meeting the product strength requirement.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a sludge incineration ash-based geological polymer and a preparation method thereof. Background technique [0002] There are many resource routes for sludge disposal. The sludge sintered brick can directly process the sludge, and the organic matter in the sludge can be burned during the sintering process to provide energy [1] . In addition, as fuel, fertilizer, poultry feed, soil improver, ceramsite and cement, etc., are all feasible resource routes for sludge disposal. There are also many related research and patent reports, such as the use of sludge incineration ash in patent CN105110663A The geopolymer with certain strength was synthesized under the excitation of strong base NaOH. However, the effective treatment rate of sludge in our country is only about 33%, mainly because the products obtained from sludge through the resource recovery route have no characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00
CPCC04B12/005Y02P40/10
Inventor 姜瑞雨纪秀俊范宗良朱涛唐喆苏瑛杨连生胡艳
Owner YANCHENG INST OF TECH
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