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Method of preparing hierarchical pore ceramsite from red mud and coal ash

A technology of fly ash and multi-level pores is applied in the field of solid waste recycling and environment, which can solve the problems of low removal efficiency of pollutants in water, less than 15% utilization rate, limited application scope, etc. Environmental hazard, effect of improving removal efficiency

Pending Publication Date: 2019-06-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, fly ash in my country is mainly used for the production of low value-added purposes such as cement, bricks and road paving, with a utilization rate of about 70%; due to the strong alkalinity of red mud, its utilization rate is still less than 15%
Open-pore ceramsite has a rich macropore structure visible to the naked eye, and is mainly used as a biofilm carrier and is widely used in sewage treatment. However, the existing porous ceramsite has a single pore type and a small specific surface area. The removal efficiency is low, which seriously limits its application range

Method used

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  • Method of preparing hierarchical pore ceramsite from red mud and coal ash
  • Method of preparing hierarchical pore ceramsite from red mud and coal ash
  • Method of preparing hierarchical pore ceramsite from red mud and coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: a kind of method utilizing red mud and fly ash to prepare multi-level porous ceramsite, concrete steps are as follows:

[0031] (1) Mix fly ash and red mud evenly to obtain mixture A; dry and pulverize agricultural and forestry waste slag (bagasse) to obtain agricultural and forestry waste granules; mix mixture A and agricultural and forestry waste granules evenly, add water and stir evenly to obtain mixed mud B; wherein in mass percentage, fly ash accounts for 75% in the mixture A; the mass ratio of agricultural and forestry waste slag particles to the mixture A is 18:100;

[0032] (2) Granulate the mixed mud B in step (1) to obtain ceramsite blank sample C (see figure 1 ); wherein the particle size of ceramsite blank sample C is 10mm;

[0033] (3) The ceramsite blank sample C in step (2) was treated at a temperature of 110°C for 90 minutes, and then placed at a temperature of 450°C for 30 minutes at a constant temperature to obtain prefabricated ceramsi...

Embodiment 2

[0043] Embodiment 2: a kind of method utilizing red mud and fly ash to prepare multi-level porous ceramsite, concrete steps are as follows:

[0044] (1) Mix fly ash and red mud evenly to obtain mixture A; dry and pulverize agricultural and forestry waste residue (sawdust) to obtain agricultural and forestry waste residue particles; mix mixture A and agricultural and forestry waste residue particles evenly, add water and stir evenly to obtain mixed mud B ; Wherein by mass percentage, fly ash accounts for 71.4% in the mixture A; the mass ratio of agricultural and forestry waste slag particles and mixture A is 14:100;

[0045](2) Granulating the mixed mud B in step (1) to obtain ceramsite blank sample C; wherein the particle size of ceramsite blank sample C is 10mm;

[0046] (3) Treat the ceramsite blank sample C in step (2) at a temperature of 105°C for 110 minutes, and then place it at a temperature of 400°C for 40 minutes to obtain prefabricated ceramsite;

[0047] (4) The pr...

Embodiment 3

[0054] Embodiment 3: a kind of method utilizing red mud and fly ash to prepare multi-level porous ceramsite, concrete steps are as follows:

[0055] (1) Mix fly ash and red mud evenly to obtain mixture A; dry and pulverize agricultural and forestry waste residue (coffee grounds) to obtain agricultural and forestry waste residue particles; mix mixture A with agricultural and forestry waste residue particles evenly, add water and stir evenly to obtain mixed mud B; wherein in mass percentage, fly ash accounts for 84.7% in mixture A; the mass ratio of agricultural and forestry waste residue particles to mixture A is 14.4:100;

[0056] (2) Granulating the mixed mud B in step (1) to obtain ceramsite blank sample C; wherein the particle size of ceramsite blank sample C is 15mm;

[0057] (3) Treat the ceramsite blank sample C in step (2) at a temperature of 100°C for 130 minutes, and then place it at a temperature of 350°C for 60 minutes at a constant temperature to obtain prefabricat...

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Abstract

The invention discloses a method of preparing hierarchical pore ceramsite from red mud and coal ash and belongs to the technical field of solid waste reclamation and environment. The method comprisesthe following steps: uniformly mixing the coal ash, the red mud and agriculture and forestry waste residues, and adding water and uniformly stirring the mixture to obtain mixed mud B; granulating themixed mud B to obtain a ceramsite blank sample C; putting the ceramsite blank sample C at 90-120 DEG C to be treated for 60-180 min and then putting the ceramsite blank sample at 350-450 DEG C to be treated for 30-60 min at a constant temperature to obtain pre-ceramsite; putting the pre-ceramsite at 950-1150 DEG C to be roasted for 20-70 min and then carrying out furnace cooling to obtain hierarchical pore ceramsite D; and adding the hierarchical pore ceramsite D into an alkaline solution, then adding sodium metaaluminate to be uniformly mixed to obtain a ceramsite treatment system, heating the same at a uniform speed till the temperature of the ceramsite treatment system is 80-140 DEG C and treating the same for 6-24 hours, extracting the ceramsite, washing the same to be neutral and drying the ceramsite to obtain the hierarchical pore ceramsite. The hierarchical pore ceramsite has two duct structures: macropores and micropores and has good water absorption, water retaining property and ion exchange function.

Description

technical field [0001] The invention relates to a method for preparing multi-level porous ceramsite by using red mud and fly ash, and belongs to the technical field of solid waste recycling and environment. Background technique [0002] With the rapid development of industries such as mining, metallurgy and power generation in my country, the generation of solid waste such as fly ash and red mud continues to increase. Fly ash is a kind of pozzolan-like mixed material formed after pulverized coal is burned at high temperature. The total storage of fly ash in my country has exceeded 1 billion tons, and it is still growing at a rate of 560-610 million tons per year. Red mud is produced during the process of refining alumina from bauxite, and 1 to 2.5 tons of red mud is discharged for every ton of aluminum produced. my country is one of the largest red mud producing countries in the world. It is estimated that my country's red mud discharge exceeds 6 million tons per year, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/135C04B38/06C04B41/80
CPCY02P40/60
Inventor 张兰李如燕董祥
Owner KUNMING UNIV OF SCI & TECH
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