Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Fly ash brightening method

A technology of fly ash and calcium hydroxide, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of secondary pollution, unsuitable promotion, high cost, etc.

Inactive Publication Date: 2005-03-16
TSINGHUA UNIV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although strong acid or strong alkali can roughen the surface of fly ash, it cannot improve the whiteness of fly ash, and the follow-up treatment is difficult, high cost, easy to cause secondary pollution, and is not suitable for large-scale promotion.
According to literature reports, this method is still in the stage of laboratory research.

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 brightening method
  • Fly ash brightening method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 200g fly ash, 735ml concentration is 9% Ca(OH) 2 The solution was thoroughly mixed with 2750 ml of tap water in the reactor. Heating at normal pressure and 100° C. for 1 hour with a stirring speed of 410 rpm. After the reaction is finished, cool the slurry to 30° C., and pass in carbon dioxide gas for neutralization, filtration, and drying. The whiteness of the final fly ash product is 68.66 (the raw material whiteness is 36.86), and the specific surface area is 25.03m 2 / g (the specific surface area of ​​the raw material is 3.07m 2 / g), bulk density 0.38g / cm 3 (The bulk density of the raw material is 1.10g / cm 3 ).

Embodiment 2

[0020] 150g fly ash, 735ml concentration is 9% Ca(OH) 2 The solution was thoroughly mixed with 1533 ml of tap water in the reactor. Heating at normal pressure and 95° C. for 4 hours with a stirring speed of 320 rpm. After the reaction is finished, cool the slurry to 33° C., and pass in carbon dioxide gas for neutralization, filtration, and drying. The whiteness of the final fly ash product is 69.43 (the raw material whiteness is 35.99), and the specific surface area is 23.95m 2 / g (the specific surface area of ​​the raw material is 3.07m 2 / g), bulk density 0.42g / cm 3 (The bulk density of the raw material is 1.10g / cm 3 ).

Embodiment 3

[0022] 200g fly ash, 833ml concentration is 8% Ca(OH) 2 The solution was thoroughly mixed with 3700 ml of tap water in the reactor. Heating at normal pressure and 80° C. for 7 hours with a stirring speed of 470 rpm. After the reaction is finished, cool the slurry to 28° C., and pass in carbon dioxide gas for neutralization, filtration, and drying. The whiteness of the final fly ash product is 65.15 (the raw material whiteness is 33.54), and the specific surface area is 34.83m 2 / g (the specific surface area of ​​the raw material is 3.07m 2 / g), bulk density 0.45g / cm 3 (The bulk density of the raw material is 1.10g / cm 3 ).

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
Specific surface areaaaaaaaaaaa
Bulk densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a fly ash brightening method which comprises, mixing fly ash with calcium hydroxide solution, heating, stirring for modifying the surface of the fly ash, then cooling down the slurry, and letting in carbon dioxide to neutralize the remaining calcium hydroxide.

Description

technical field [0001] The invention relates to a treatment method of fly ash, in particular to a treatment method of fly ash discharged outside by wet method. It belongs to the technical field of solid waste recycling engineering in the discipline of environmental engineering. Background technique [0002] Fly ash, also known as "fly ash", is thin and light, and it is inconvenient to collect, discharge, transport, and store, and it is even more difficult to manage and utilize it. In 2001, the national production of fly ash was 168 million tons, and the utilization rate was only 52%. If it is not developed and utilized, it will not only occupy a large amount of fertile land and increase the storage cost of fly ash, but also easily form public nuisance and pollute the environment. Since the 1950s, my country's building materials department has begun to try to use fly ash in the production of building materials and concrete. In the 1960s, a fly ash utilization pattern based ...

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
IPC IPC(8): C04B18/06C04B18/08
CPCY02W30/91
Inventor 盖国胜杨玉芬郝向阳蔡振芳
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com