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A device and method for micro/nano-scale carbonization modification of fly ash surface

A fly ash, nano-scale technology, applied in chemical instruments and methods, inorganic compound addition, fibrous fillers, etc., can solve the problem that the material properties cannot reach the expected target, cannot meet the needs of heterogeneous reactions, and is difficult to achieve uniform coating and other problems, to achieve the effects of rapid and easy control of the reaction, increasing the rate of carbonization reaction, and promoting dissolution and absorption.

Active Publication Date: 2019-01-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor control will lead to independent nucleation and rapid growth of calcium carbonate, the particle size range is uncontrolled, it is difficult to achieve uniform coating on the surface of the original powder particles, and the performance of the material after filling cannot meet the expected goals
The prior art also includes a powder modification device with an inlet and outlet and a stirring device, but it cannot meet the requirements of the multiphase reaction in the carbonization modification process, especially the uniform dispersion of carbonization gas and its full contact in the reaction system

Method used

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  • A device and method for micro/nano-scale carbonization modification of fly ash surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Feeding and dispersion stage:

[0036] ① Start the drive motor 2 to drive the agitator 14 to run at a speed of 400rpm.

[0037] ② Then add lime milk with a mass concentration of 5% through the lime milk feed port 1, and mix evenly; 5% of the total mass of the suspension.

[0038] ③ Fully mix for 5 minutes until the fly ash solid particles in the suspension are completely dispersed.

[0039] (2) Carbonization modification stage:

[0040] ① Open the cooling water inlet 8, wait until the cooling water fills the entire insulation interlayer 5 and flows out from the cooling water outlet 13.

[0041] ② Then open the flow control valve on the inlet port 10 of the carbonized gas, and gradually adjust the flow so that the diameter of the bubbles generated after passing through the gas diffuser 9 is 1 mm. Introduce pure carbon dioxide. undissolved CO 2 It is discharged from the exhaust port 15 above the reaction tank 4 and reused when necessary.

[0042] ③ During the c...

Embodiment 2

[0046] (1) Feeding and dispersion stage:

[0047] ① Start the drive motor 2 to drive the agitator 14 to run at 400 rpm.

[0048] ② Add lime milk with a mass concentration of 7% through the lime milk feed port 1; then add fly ash powder with a particle size of 300 mesh to 400 mesh through the unmodified powder feed port 3, and its mass accounts for the reaction system suspension. 5% of the total mass.

[0049] ③ Fully mix for 5 minutes until the fly ash solid particles in the suspension are completely dispersed.

[0050] (2) Carbonization modification stage:

[0051] ① Open the cooling water inlet 8, wait until the cooling water fills the entire insulation interlayer 5 and flows out from the cooling water outlet 13.

[0052] ② Then open the flow control valve on the inlet port 10 of the carbonized gas, and gradually adjust the flow so that the diameter of the bubbles generated after passing through the gas diffuser 9 is 1 mm. And adjust the volume content of air in the carb...

Embodiment 3

[0057] (1) Feeding and dispersion stage:

[0058] ① Start the drive motor 2 to drive the agitator 14 to run at a speed of 600 rpm.

[0059] ② Add lime milk with a mass concentration of 10% through lime milk inlet 1; then add fly ash powder with a particle size of 400 mesh to 500 mesh through unmodified powder inlet 3, and its mass accounts for 10% of the reaction system suspension. 5% of the total mass. Add borax through cleaning water inlet 7, and the addition amount is 0.1% of the dry weight of fly ash.

[0060] ③ Fully mix for 5 minutes until the fly ash solid particles in the suspension are completely dispersed.

[0061] (2) Carbonization modification stage:

[0062] ① Open the cooling water inlet 8, wait until the cooling water fills the entire insulation interlayer 5 and flows out from the cooling water outlet 13.

[0063] ② Then open the flow control valve on the inlet port 10 of the carbonized gas, and gradually adjust the flow so that the diameter of the bubbles g...

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Abstract

The invention discloses an apparatus and method for surface micro / nanometer carbonization modification of fly ash. The apparatus mainly comprises a reaction tank, a stirring device, a gas dispersing device, an insulation interlayer, etc. The method comprises the following steps: injecting a crystal form controlling agent and lime milk into the reaction tank at first; then adding fly ash into the reaction tank and uniformly dispersing the fly ash by using the stirring device; injecting carbonization gas from the bottom of the reaction tank via the gas dispersing device and carrying out a carbonization reaction; and bringing heat produced in the reaction away by using cooling water flowing in the insulation interlayer from bottom to top. The apparatus improves the rate of the carbonization reaction by using the bottom carbonization gas dispersing device and creates a stable environment by using the insulation interlayer where the cooling water flows from bottom to top so as to promote surface nucleation and uniform coating of matrix particles of the fly ash.

Description

technical field [0001] The invention relates to the field of powder surface modification, in particular to a device and method for surface micro / nano-scale carbonization modification of fly ash particles. Background technique [0002] As a by-product of coal combustion in power plant boilers, fly ash is one of the largest sources of urban solid waste emissions in my country. The stacking of fly ash will directly or indirectly cause a series of environmental problems such as air, soil, and rivers, and at the same time cause a great waste of resources. Over the years, scholars at home and abroad have studied the resource utilization technology of fly ash through various methods, and have made breakthroughs in construction, roads, sewage treatment, mineral extraction, and material filling. However, there are a series of problems in the utilization of these fields, such as low product yield, low added value, and high processing cost. Because fly ash has a similar chemical comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/00C09C3/06D21H17/69
CPCC01P2004/61C01P2006/65C09C1/00C09C3/063D21H17/69
Inventor 樊慧明齐亚楠刘建安李哲
Owner SOUTH CHINA UNIV OF TECH
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