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

Method for extracting alumin from aluminous fly-ash and method for producing cement from fag end

A high-alumina fly ash and alumina technology, applied in the field of cement production, can solve the problems of high energy consumption, difficulty in realization, and low utilization rate of fly ash, achieve energy-saving calcination equipment, reduce production costs, and simplify calcination equipment Effect

Inactive Publication Date: 2007-09-05
CHANGAN UNIV
View PDF3 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is a new technology proposed by our country's scientific and technological personnel. It has not been proved that it can be successfully industrialized for more than 20 years. In addition to other reasons, the technology itself has serious problems: first, it is the steaming of calcium oxide and fly ash under normal pressure. To produce hydrated calcium aluminate and hydrated calcium silicate, this is not easy to achieve in practice; secondly, the main crystal phase of the clinker produced by low-temperature calcination is still calcium aluminate and calcium silicate. During the process, in theory, silicon oxide will be leached, so it does not conform to the actual chemical reaction law without desiliconization process
[0008] To sum up, high energy consumption and low utilization rate of fly ash are the main problems in 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 alumin from aluminous fly-ash and method for producing cement from fag end

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] raw material

[0035] Process ratio: fly ash / lime=1 / 2, adding water to solid-liquid ratio: 1:0.3, steaming at 180°C for 4 hours, calcining at 900°C for 4 hours, 8% sodium carbonate solution in accordance with the liquid-solid ratio of 5:1 After leaching at 80°C for 40 minutes, the leaching rate of alumina is 80%, and the content of silicon oxide in alumina is less than 0.3%, meeting the composition requirements of metallurgical grade alumina.

[0036] name

[0037] name

[0038] The results obtained from the above ingredients KH=0.89, SM=2.29, IM=1.31 all meet the requirements of wet kiln calcined cement. The 28-day compressive strength of the cement obtained according to the above ratio is greater than 52.5MPa, and the flexural resistance is greater than 7MPa, reaching the strength grade of No. 52.5 cement.

[0039] raw material

[0040] name

[0041] name

[0042] Among the above ingredients, KH=89, SM=1.94, ...

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

A process for extracting aluminum oxide from high-Al powdered coal ash and using the residual dregs to prepare cement includes such steps as mixing with lime and water, steam pressure reaction to generate the resultant containing hydrated calcium silicoaluminate and calcium hydroxide, calcining, extracting in sodium carbonate solution to obtain aluminum oxide, desiliconizing, carbonizing, calcining to obtain high-purity aluminum oxide, and using the SiCa dregs to prepare cement.

Description

technical field [0001] The invention relates to a method for extracting alumina, in particular to a method for extracting alumina from high-alumina fly ash, and also relates to a method for producing cement from the waste residue of extracting alumina from high-alumina fly ash. Background technique [0002] There are already many patents at home and abroad for the extraction of alumina from fly ash and the simultaneous production of cement. [0003] The methods of extracting alumina from fly ash at home and abroad can be divided into two categories: alkaline method and acid method. Due to the fatal shortcomings of the acid method in the industry, such as corrosive equipment and difficult recovery of acid, despite the continuous emergence of patents, the promotion of industrialization has been greatly restricted. [0004] In the 1960s, Polish scientist J. Grzymek invented the principle of lime self-pulverization method and built an experimental plant with an annual output of...

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): C01F7/30C04B7/24
CPCY02P40/10
Inventor 赵鹏李昊明魏林
Owner CHANGAN 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