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

Method for comprehensively utilizing fly ash

A technology for fly ash and lime, which is applied in the field of comprehensive utilization of fly ash, can solve the problem that the value of fly ash is not fully utilized, and achieve the effects of environmental friendliness, high potential and low calcium content.

Inactive Publication Date: 2019-01-18
NORTHEASTERN UNIV LIAONING
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the utilization of fly ash in my country is mainly concentrated in building materials and agriculture. 2 o 3 , SiO 2 It also includes oxides of Fe, Ca, Mg, S, K, Na, Ti, P and various trace elements, as well as unburned carbon

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
  • Method for comprehensively utilizing fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Present embodiment adopts fly ash, main chemical composition (mass percentage, wt%) is: aluminum oxide (Al 2 o 3 )50.7%, silicon dioxide (SiO 2 )38.3%, sodium oxide (Na 2 O) 0.37%, calcium oxide (CaO) 3.61%, iron oxide (Fe 2 o 3 ) 2.17%, titanium dioxide (TiO 2 ) 1.81%, and its aluminum-silicon ratio is 1.19.

[0066] according to figure 1 Process processing:

[0067] S1 Mixing ingredients: After desiliconization, fly ash is mixed with a small amount of lime, carbon soda and circulating mother liquor, and mixed with circulating mother liquor in a ball mill according to the ratio of L / S=3, and then dried outside the kiln.

[0068] The lime that the mixed batching of step S1 is used and replenishing soda carbon are common industrial grade products; X N =0.5;X C = 1.0.

[0069] S2 sintering: the dried raw materials are sintered at 1100°C for 1 hour, and sintered clinker is obtained after the reaction.

[0070] S3 leaching reaction: the sintered clinker is subjec...

Embodiment 2

[0077] Present embodiment adopts fly ash, main chemical composition (mass percentage, wt%) is: aluminum oxide (Al 2 o 3 )38.18%, silicon dioxide (SiO 2 )32.86%, sodium oxide (Na 2 O) 0.07%, calcium oxide (CaO) 11.60%, iron oxide (Fe 2 o 3 )3.01%, titanium dioxide (TiO 2 ) 1.81%, and its aluminum-silicon ratio is 1.16.

[0078] according to figure 1 Process processing:

[0079] S1 Mixing ingredients: After desiliconization, the fly ash is mixed with a small amount of lime, carbon soda and circulating mother liquor, mixed with the circulating mother liquor in a ball mill according to the ratio of L / S=3, and then dried outside the kiln;

[0080] The lime that the mixed batching of step S1 is used and make up caustic soda are common industrial grade products; X N = 1.0; X C = 1.0.

[0081] S2 sintering: sintering the dried raw materials at 1150°C for 1 hour, and obtaining sintered clinker after the reaction;

[0082] S3 leaching reaction: the sintered clinker is subjected...

Embodiment 3

[0090] Present embodiment adopts fly ash, main chemical composition (mass percentage, wt%) is: aluminum oxide (Al 2 o 3 ) 42.11%, silicon dioxide (SiO 2 ) 45.90%, sodium oxide (Na 2 O) 0.37%, calcium oxide (CaO) 2.21%, iron oxide (Fe 2 o 3 ) 2.02%, titanium dioxide (TiO 2 ) 1.39%, and its aluminum-silicon ratio is 1.19.

[0091] according to figure 1 Process processing:

[0092] S1: After desiliconization, the fly ash is mixed with a small amount of lime, carbon soda and circulating mother liquor, mixed evenly with the circulating mother liquor in a ball mill according to the ratio of L / S=3, and then dried outside the kiln;

[0093] The lime that the mixed batching of step S1 is used and replenishing soda carbon are common industrial grade products; X N = 1.0; X C = 1.5.

[0094] S2: The dried raw materials are sintered at 1150° C. for 1 hour, and sintered clinker is obtained after the reaction.

[0095] S3: The sintered clinker is subjected to leaching reaction, an...

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
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for comprehensively utilizing fly ash. The method comprises the following steps: S1, mixing and preparing materials: mixing and preparing the fly ash, lime, alkali and a mother solution and drying to obtain mixed raw materials; S2, sintering: carrying out sintering reaction on the mixed raw materials at the temperature of 800 to 1250 DEG C, so as to obtain sintered clinker; S3, carrying out leaching reaction: carrying out the leaching reaction on the sintered clinker; carrying out liquid-solid separation to obtain leaching residues and a leaching solution; S4,carrying out aluminum extraction treatment: treating the leaching solution by utilizing evaporation, concentration and crystallization, seed crystal decomposition and carbonization decomposition or any combination of former three manners, so as to obtain an aluminum extraction mother solution and an Al(OH)3 or NaAlO2 crystal; after concentrating the aluminum extraction mother solution, returningback to S1; S5, carrying out dealkalization on the leaching residues: mixing the leaching residues and a sodium hydroxide solution and carrying out dealkalization reaction; carrying out solid-liquid separation to obtain calcium silicate powder and alkali liquid; S6, recycling the alkali liquid of S5. According to the method provided by the invention, aluminum oxide and silicon oxide in the fly ashare recycled; the extraction rate of the aluminum oxide can reach 90 percent or more and nearly no pollutants are discharged; nearly all components of the fly ash are recycled and utilized; the effects of recycling treatment and high-additional-value comprehensive utilization of the fly ash are realized.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of fly ash, in particular to a method for comprehensive utilization of fly ash. Background technique [0002] Fly ash is a powdery substance with fine particles and the ability to flow in the air. The so-called fly ash refers to the material discharged from the flue and bottom of the furnace after the pulverized coal is burned in the boiler in the coal-fired power plant. Fly ash is a major by-product of coal-fired power plants and the largest industrial waste emitter. According to calculations, 250-300kg of fly ash is produced for every 1 ton of coal burned. Every time a coal-fired thermal power plant generates 1kW·h of electricity, it needs to consume about 300g of coal and produce about 100g of fly ash. By 2008, the annual emission of fly ash in China has exceeded 200Mt, and it is still growing at a relatively fast rate. [0003] The massive discharge of fly ash not only po...

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): C01B33/24C01F7/14C01F7/04
CPCC01B33/24C01F7/0693C01F7/14C01F7/142
Inventor 潘晓林于海燕吴艳毕诗文
Owner NORTHEASTERN UNIV LIAONING
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