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

Method for detecting activity of metakaolin by using spectrophotometer

A spectrophotometer, metakaolin technology, applied in the measurement of color/spectral properties, etc., can solve the problems of inconvenient detection, inconspicuous color change, and difficulty in judging the titration end point, achieving less sample volume, fast analysis speed, and low equipment cost. Effect

Inactive Publication Date: 2010-10-06
XIAMEN UNIV
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it needs to be heated and boiled, the indicator can only be added dropwise after cooling, which brings inconvenience to the detection
And this method takes "the indicator changes from yellow to emerald green to grass green as the end point", the color change is not obvious, the titration end point is difficult to judge, and there are many human errors

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 detecting activity of metakaolin by using spectrophotometer
  • Method for detecting activity of metakaolin by using spectrophotometer
  • Method for detecting activity of metakaolin by using spectrophotometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Zhangzhou iron dyed kaolin is used as raw material. where Al 2 o 3 The content is 38.24%, Fe 2 o 3 The content is 0.94%. The main mineral composition is kaolinite and a small amount of quartz, and the mineral structure is flake and a large number of tubes.

[0043] 2) Calcining Zhangzhou iron-dyed kaolin in a high-temperature energy-saving electric furnace. Kaolin is finely ground and passed through a 100-mesh sieve. The heating rate was 7.5°C / min, the calcination temperatures were 500°C, 600°C, 700°C, 800°C, 900°C, 1000°C, and the calcination time was 2h. After the calcination, the kaolin was cooled to room temperature with the furnace, and the metakaolin sample was taken out.

[0044] 3) Weigh about 1g of metakaolin sample and pour it into a 250mL three-necked flask. Then pour 20mL of 15% hydrochloric acid, heat to 80°C in a constant temperature water bath, and stir for 2h. The liquid-solid mixture in the three-necked flask was cooled, filtered and washed....

Embodiment 2

[0050] Raw material and analysis test process are with embodiment 1. Kaolin is passed through a 100-mesh sieve. When calcining kaolin, the heating rate is 7.5°C / min, the calcining temperature is 700°C, and the calcining time is 2h, 4h, 6h, 8h, and 10h respectively. The measured activated alumina contents are respectively: 17.84%, 18.72%, 19.02%, 19.56%, 19.86%. The compressive strengths of the prepared geopolymeric cementitious materials are 55.26MPa, 57.59MPa, 58.02MPa, 58.96MPa, 59.46MPa respectively. It has a good correspondence with the determined active alumina content.

Embodiment 3

[0052] Raw material and analysis test process are with embodiment 1. Kaolin is passed through a 100-mesh sieve. When calcining kaolin, the heating rates were 2.5°C / min, 5°C / min, 7.5°C / min, and 10°C / min. The calcination temperature is 700° C., and the calcination time is 2 hours respectively. The measured activated alumina contents are respectively: 16.32%, 17.13%, 17.84%, and 18.26%. The compressive strengths of the prepared geopolymeric cementitious materials are 54.78MPa, 54.92MPa, 55.26MPa and 55.56MPa respectively. It has a good correspondence with the determined active alumina content.

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
Compressive strengthaaaaaaaaaa
Compressive strengthaaaaaaaaaa
Compressive strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for detecting activity of metakaolin by using a spectrophotometer, and relates to metakaolin. The invention provides the method for detecting the activity of the metakaolin by using the spectrophotometer, with the advantages of simple and convenient operation, quick measurement and reliable result. The method comprises the following steps of: pouring a sample into a container, adding hydrochloric acid into the container, performing heating reaction on the mixture, and adding water into the filtrate to fix the volume; placing an aluminum sheet into the container, infiltrating the aluminum sheet by using the hydrochloric acid till a surface oxidation layer is dissolved, pouring out the hydrochloric acid solution, placing the aluminum sheet into the container, adding aqua regia into the container, heating and dissolving the aluminum sheet, transferring the solution into a volumetric flask, diluting the solution by using water, transferring the solution into the volumetric flask, diluting the solution by using water, injecting 1mu g / mL aluminum standard solution into the volumetric flasks respectively, adding ascorbic acid solution, chromazurine-S ethanol solution and hexamethylenetetramine solution into the volumetric flask, adding water into the volumetric flask to fix the volume, then transferring the mixture to an absorption vessel, measuring the absorbance at the 545nm wavelength of the spectrophotometer, and solving the slope of an aluminum working standard curve; and measuring the aluminum content of the acid extract, and then calculating the active aluminum oxide content of the metakaolin.

Description

technical field [0001] The invention relates to metakaolin, in particular to a method for detecting the activity of metakaolin by using a spectrophotometer. Background technique [0002] Metakaolin is a metastable substance with certain chemical activity obtained after calcining kaolin at an appropriate temperature. The atomic arrangement in metakaolin is irregular, showing a thermodynamic metastable state, and has high pozzolanic activity. Therefore, metakaolin is a highly active artificial pozzolanic material. Due to its unique mineral properties, metakaolin can be used not only as a new type of mineral admixture, but also in the research and application of new cementitious materials. [0003] Metakaolin energy and cement hydration product Ca(OH) 2 The reaction produces calcium aluminate hydrate, C-S-H gel and other gelling substances, which have high hydration activity and can be used as concrete mineral admixtures. It can improve the workability and durability of hard...

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): G01N21/31
Inventor 罗学涛傅翠梨李锦堂陈文辉
Owner XIAMEN UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com