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

Method for extracting aluminum oxide from coal ash through hot-wall reaction

A technology for fly ash and alumina, which is applied in the removal of alumina/aluminum hydroxide and solid waste, can solve the problems that the dust-containing exhaust gas treatment is difficult to solve, restricts the industrial scale application, and the gas velocity of the reaction equipment is high. Facilitate exhaust gas treatment, realize comprehensive utilization of resources, and reduce the effect of reaction exhaust gas

Active Publication Date: 2014-02-05
NANJING TIANHUA CHEM ENG
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature reaction process of fly ash requires a lot of heat. The method of directly heating the material with hot gas has a low heat utilization rate, a large amount of tail gas, a high gas velocity in the reaction equipment, and a lot of dust entrained in the tail gas. It is difficult to deal with the dusty tail gas. Therefore, This restricts the industrial scale application of this method in the process technology of extracting alumina from fly ash

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 extracting aluminum oxide from coal ash through hot-wall reaction
  • Method for extracting aluminum oxide from coal ash through hot-wall reaction
  • Method for extracting aluminum oxide from coal ash through hot-wall reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 , figure 2 As shown, the method for extracting alumina from fly ash by using hot wall reaction in this embodiment uses external heating to provide heat for the reaction process of extracting alumina by high-temperature roasting of fly ash, and the reaction of fly ash materials in the reaction equipment The heat required for the reaction is provided by the heating furnace outside the reaction cylinder using high-temperature flue gas generated by burning natural gas with a burner. The heat is indirectly transferred to the material through the wall of the reaction cylinder, and the fly ash absorbs the heat from the heating furnace to complete the extraction. Aluminum oxide reaction process. The material is not in direct contact with the high-temperature gas, and the tail gas discharged from the reaction cylinder is only the process gas generated during the reaction process.

[0027] The reaction equipment of the present invention is such as figure 1 , ...

Embodiment 2

[0030] like image 3 , Figure 4 As shown, the equipment is a multi-tube structure composed of 7 reaction tubes. The reaction equipment adopts a one-piece one-chamber structure. In the multi-tube structure, the reaction tubes formed by the reaction tubes are evenly distributed along the circumferential direction. Driven by the transmission system to rotate simultaneously. The reaction mass is heated and conveyed in the reaction tube. The included angle between each reaction tube and the horizontal plane is 8°, so as to transfer the reaction materials. Other parts of the structure are the same as in Embodiment 1.

[0031]

Embodiment 3

[0033] Adopt the equipment in embodiment one or embodiment two, the specific process of a kind of method of utilizing hot wall reaction of the present invention to extract alumina from fly ash is as follows: first fly ash and ammonium sulfate mixed material are fed by equipment feed end Entering the reaction cylinder, the material is conveyed forward with the rotation of the reaction cylinder, the reaction product is aluminum sulfate, which is discharged from the discharge end, and the generated ammonia, water vapor and sulfur trioxide gas are discharged through the tail gas outlet, and the rotation speed of the reaction cylinder is 10rpm; during the conveying process, the material is heated by the heating furnace installed outside the reaction cylinder, and the temperature of the heating furnace is 1000°C.

[0034] The invention adopts the external heating method of the furnace and the reaction cylinder, which has high thermal efficiency; the tail gas discharged from the react...

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

No PUM Login to View More

Abstract

The invention provides a method for extracting aluminum oxide from coal ash through high-temperature hot-wall reaction, in order to improve the thermal efficiency in the process of extracting the aluminum oxide from the coal ash, facilitate the treatment of dusty gases, reduce the emission of tail gases and realize the large-scale industrial production of the aluminum oxide extracted from coal ash. The method is characterized in that a reaction material enters a reaction barrel from a feed end of equipment and is conveyed forwards along with the rotational motion of the reaction barrel, a reaction product is discharged from a discharge end, and gases generated in reaction are discharged through a tail gas outlet; the rotation speed of the reaction barrel is 0.1-10rpm and is used for adjusting the conveying speed of the reaction material; and the material is heated by a heating hearth sheathed outside the reaction barrel in the conveying process, and the hearth temperature is 140-1000 DEG C. The equipment mainly comprises the reaction barrel, the heating hearth, a supporting system, a driving system and a heat supply system.

Description

technical field [0001] The invention relates to a reaction process and equipment for extracting alumina from fly ash, in particular to a method for extracting alumina from fly ash by means of hot wall reaction. Background technique [0002] Coal occupies an important position in my country's energy structure and is one of the main energy sources in my country at present. Fly ash is a solid waste discharged from coal-fired power plants. Its discharge is very large. It occupies arable land and pollutes the environment. It is a solid waste that needs to be treated. In some high-aluminum coal production areas in my country, the alumina content in the fly ash discharged from coal-fired power plants is as high as 40-60%, which is a very important alumina and aluminum resource. For this reason, the extraction of alumina from fly ash is of great significance for the recycling of fly ash, the realization of the integrated industrial cycle of coal, electricity, ash and aluminum, the ...

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 李仁金张毅李盈海蒋永中张传杰李晓晓褚维平
Owner NANJING TIANHUA CHEM ENG
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