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Method for preparing geopolymer by coupling FCC waste catalyst and red mud

A geopolymer and waste catalyst technology, applied in the field of solid waste resource utilization, can solve problems such as occupation and environmental pollution

Inactive Publication Date: 2020-10-20
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects in the above-mentioned prior art, the purpose of the present invention is to provide a method for coupling the waste FCC catalyst with red mud to prepare geopolymers, mix the waste FCC catalyst with the red mud of the sintering process, and adjust the calcium The aluminum ratio is adjusted, and the silicon-aluminum ratio is adjusted through silica fume. Under the action of the compound alkali activator, high-strength geopolymers are obtained through curing, thereby effectively curing heavy metals in FCC spent catalysts, and solving environmental pollution and land resource occupation. and other issues, and achieved the goal of resource utilization of solid waste

Method used

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  • Method for preparing geopolymer by coupling FCC waste catalyst and red mud

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A geopolymer prepared by coupling FCC waste catalyst with sintering red mud, wherein the main components in the sintering red mud are: SiO 2 The content is about 21.06wt%, Al 2 o 3 The content of CaO is about 10.66wt%, and the content of CaO is about 40.62wt%; The main components in the spent FCC catalyst are: SiO 2 The content is about 37.65wt%, Al 2 o 3 The content of is about 55.29wt%, and the particle size of the spent FCC catalyst is less than 0.2mm.

[0045] Its preparation method comprises the following steps:

[0046] S1. Mix 200g of FCC waste catalyst with 300g of sintering red mud powder to obtain a mixed powdery material A with a calcium-aluminum molar ratio of 0.78;

[0047] S2. Add 211.07g of silica fume to the mixed powdery material A obtained in step S1, SiO in the silica fume 2 The content of is about 93.33%, and the mixed powdery material B with a silicon-aluminum molar ratio of 2 is obtained;

[0048] S3. take by weighing 86.56g sodium hydroxide...

Embodiment 2

[0052] A geopolymer prepared by coupling FCC waste catalyst and sintering red mud, wherein the composition of the FCC waste catalyst and sintering red mud is roughly the same as in Example 1, and the preparation method is as follows:

[0053] S1. Mix 250g of FCC waste catalyst with 250g of sintering red mud powder to obtain a mixed powdery material A with a molar ratio of calcium to aluminum of 0.56;

[0054] S2. Add 258.45g of silica fume to the mixed powdery material A obtained in step S1, SiO in the silica fume 2 The content of is about 93.33%, and the mixed powdery material B with a silicon-aluminum molar ratio of 2 is obtained;

[0055] S3. take by weighing 86.56g sodium hydroxide and 412.17g water glass, add sodium hydroxide in water glass under stirring, until sodium hydroxide dissolves completely, obtain the compound alkali activator that modulus is 1.2, stand-by;

[0056] Then mix the composite base activator (379.23g) with a mass ratio of 1:2 and the mixed powdery m...

Embodiment 3

[0059] A geopolymer prepared by coupling FCC waste catalyst and sintering red mud, wherein the composition of the FCC waste catalyst and sintering red mud is roughly the same as in Example 1, and the preparation method is as follows:

[0060] S1. Mix 300g of FCC waste catalyst with 200g of sintering red mud powder to obtain a mixed powdery material A with a molar ratio of calcium to aluminum of 0.40;

[0061] S2. Add 305.83g of silica fume to the mixed powdery material A obtained in step S1, SiO in the silica fume 2 The content of is about 93.33%, and the mixed powdery material B with a silicon-aluminum molar ratio of 2 is obtained;

[0062] S3. take by weighing 86.56g sodium hydroxide and 412.17g water glass, add sodium hydroxide in water glass under stirring, until sodium hydroxide dissolves completely, obtain the compound alkali activator that modulus is 1.2, stand-by;

[0063] Then mix the composite base activator (402.92g) with a mass ratio of 1:2 and the mixed powdery m...

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Abstract

The invention provides a method for preparing a geopolymer by coupling an FCC waste catalyst and red mud. According to the method, an FCC waste catalyst is mixed with sintering process red mud; and the preparation method comprises the following steps: regulating the raw material ratio to adjust the calcium-aluminum ratio to 0.3-0.8, adding silica fume to regulate the silicon-aluminum ratio to 1.8-2.2, mixing with a composite alkali activator, injecting into a mould, and carrying out mould forming, curing, demoulding and curing treatment to obtain the high-strength geopolymer. According to themethod, heavy metals in the FCC waste catalyst can be effectively cured, and the sintering process red mud with a high calcium content is combined with the FCC waste catalyst, so that the polymerization and solidification hardening process of the gel excited by the mixture can be effectively regulated and controlled, and the compressive strength of the geopolymer is improved. In this way, the problems of environmental pollution, land occupation and the like are solved, and the purpose of resource utilization of solid wastes is achieved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a method for preparing geopolymer by coupling FCC waste catalyst with red mud. Background technique [0002] Fluid catalytic cracking (FCC) is one of the most important conversion processes in petroleum refineries, and FCC catalysts play an important role in this process. With the increasingly heavy and inferior crude oil and the continuous recycling of FCC catalysts, the metals deposited on the FCC catalysts will gradually increase, resulting in a decrease in activity and heavy oil conversion capacity, and the formation of spent FCC catalysts. Although the spent FCC catalyst has lost its catalytic activity, most of its internal molecular sieve structure is intact, and it still has a certain utilization value. Metals such as Ni, V, and Fe are the main elements that cause FCC catalyst poisoning, and it is generally difficult to regenerate s...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B40/02C04B22/08C04B18/04C04B22/06
CPCC04B28/006C04B40/0039C04B40/0281C04B2201/50C04B2111/00784C04B18/0472C04B18/0409C04B12/04C04B22/062C04B18/146C04B40/0263Y02W30/91Y02P40/10
Inventor 倪红卫张华李杨余丽何环宇
Owner WUHAN UNIV OF SCI & TECH
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