Fly ash low-temperature wet activating treatment method

An activation treatment, fly ash technology, applied in the direction of alumina/aluminum hydroxide, solid waste removal, etc., can solve the problems of high energy consumption of grinding and sintering, poor prospects, air pollution, etc., to reduce energy consumption and equipment investment, reduce raw material costs, good environmental compatibility

Inactive Publication Date: 2013-10-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy consumption of grinding and sintering is high; the method of adding fluoride may not only pollute the atmosphere, but also produce highly toxic fluosilicic acid during the decomposition process of fly ash, causing secondary pollution; microwave heating technology is difficult to implement in industry, The outlook is not good

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fly ash low-temperature wet activating treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment uses fly ash containing Al 2 o 3 41.41%, SiO 2 39.54%, is a kind of white or gray powder substance similar to volcanic ash collected from flue gas after pulverized coal is burned at high temperature in pulverized coal furnace.

[0030] 1) Ingredients: mix the fly ash and the alkali solution whose NaOH concentration is 300g / l and add them into the activation reactor, the volume-mass ratio of the alkali solution to the fly ash is 5:1 (ml / g);

[0031] 2) Activation: Activate the material obtained in step 1) in a reactor, the activation temperature is 180°C, the activation time is 2h, and the reaction slurry is obtained after the activation is completed;

[0032] 3) separation: the slurry obtained in step 2) is subjected to liquid-solid separation to obtain crude lye and activated fly ash;

[0033] 4) Purification: add calcium oxide to the crude lye after dilution and react at 100°C for 3 hours, and obtain calcium-containing slag and lye after liquid-soli...

Embodiment 2

[0036] This embodiment uses fly ash containing Al 2 o 3 32.43%, SiO 2 41.77%, is a white or gray powder substance similar to volcanic ash that is collected from the flue gas after the pulverized coal is burned at a high temperature in a circulating fluidized bed.

[0037] 1) Ingredients: the fly ash and the NaOH alkali solution with a NaOH concentration of 700g / l are mixed together and added to the activation reactor, and the volume-mass ratio of the alkali solution to the fly ash is 20:1 (ml / g);

[0038] 2) Activation: The material obtained in step 1) is activated in a reactor, the activation temperature is 130°C, the activation time is 5h, and the reaction slurry is obtained after the activation is completed;

[0039] 3) Separation: after diluting the slurry obtained in step 2), liquid-solid separation is obtained to obtain crude lye and activated fly ash;

[0040] 4) Purification: add calcium oxide to the crude lye after dilution and react at 80°C for 5 hours. After liqu...

Embodiment 3

[0043] This embodiment uses fly ash containing Al 2 o 3 41.41%, SiO 2 39.54%, is a kind of white or gray powder substance similar to volcanic ash collected from flue gas after pulverized coal is burned at high temperature in pulverized coal furnace.

[0044] 1) Ingredients: mix the fly ash and the alkali solution with a NaOH concentration of 550g / l and add them into the activation reactor, the volume-to-mass ratio of the alkali solution to the fly ash is 20:1 (ml / g);

[0045] 2) Activation: The material obtained in step 1) is activated in a reactor, the activation temperature is 175°C, the activation time is 0.5h, and the reaction slurry is obtained after the activation is completed;

[0046] 3) Separation: separating the liquid and solid of the slurry obtained in step 2) to obtain crude lye and activated fly ash;

[0047] 4) Purification: the crude lye is diluted and then added with calcium oxide to react at 120°C for 1 hour, and the obtained slurry is separated from liqui...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
decomposition efficiencyaaaaaaaaaa
Login to view more

Abstract

The invention provides a fly ash low-temperature wet activating treatment method, comprising the following steps of: (1) mixing the fly ash with the strong alkali solution of which the concentration is 300-700g / l, to perform activating treatment, wherein the volume-to-mass ratio of the alkali solution and the fly ash is (3:1)-(20:1) (ml / g), the activating temperature is 130-180 DEG C, the activating time is 0.5-10 hours, and the activating pressure is normal pressure to 0.5Mpa; performing liquid-solid separation after activation to get the crude alkali liquor and the activated fly ash; (2) diluting the crude alkali liquor, then, adding calcium oxide into the diluted crude alkali liquor for purification, performing liquid-solid separation to get calcareous residues and strong alkali solution, wherein the calcareous residues is output to the system as byproducts, and the strong alkali solution is recycled for fly ash activating treatment. In the method, the alkali solution is NaOH water solution, KOH water solution, sodium aluminate solution or potassium aluminate solution, after being activated, the fly ash is dissolved out by diluted acid, and the dissolution rate of aluminum oxide is up to 95-99%. In the method, the activation temperature is low, the activation effect is excellent, the activation process cannot cause secondary pollution, and essential conditions for follow-up fly ash treatment, especially for extraction of aluminum oxide, zeolite preparation, and the like, are created.

Description

technical field [0001] The invention relates to a low-temperature wet activation treatment method for fly ash. Background technique [0002] With the rapid development of my country's national economy, my country's aluminum industry is facing a serious shortage of resources, and the safety of the aluminum industry has been severely challenged. At the same time, because my country is one of the few countries in the world that use coal as the main energy source, coal has always occupied a dominant position in my country's energy consumption pattern. After coal combustion, a large amount of coal-fired solid waste is produced, one of which is fly ash. For every four tons of coal consumed by thermal power plants, one ton of fly ash will be produced. In 2010, the discharge of fly ash in my country was about 480 million tons. . Due to the low utilization rate of fly ash and the high concentration of production areas, a large amount of fly ash has been stockpiled in my country, and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B09B3/00
Inventor 马淑花薄春丽郑诗礼张懿杨权成王月娇班琦勋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap