Contact Info

Improved processing model can reduce limestone in cement production – Phys.org


Forget Password?
Learn more
share this!
1
Twit
Share
Email
September 7, 2023
This article has been reviewed according to Science X’s editorial process and policies. Editors have highlighted the following attributes while ensuring the content’s credibility:
fact-checked
trusted source
proofread
by Sara-Lena Brännström,
The cement industry has long been a central part of infrastructure and development, but its impact on the environment remains a challenge.

“The quarrying of limestone, as in , affects both natural resources and groundwater. It is also very dependent on new mining permits,” says Erik Viggh, doctoral student at the Industrial Doctoral School and the Department of Applied Physics and Electronics at Umeå University.
In order to find raw materials for to reduce the need for natural limestone, metallurgical slag, a by-product from the steel industry, has been investigated. Slag has been shown to be a suitable substitute, providing a significant reduction in from the cement process. However, it is unclear as to how the quality of the cement is affected.
Through his research, Erik Viggh has developed a chemical model that can be used by the to evaluate how changes in the process and use of raw materials affect cement quality. This makes it easier to steer production towards a lower climate impact.
One substance that plays a crucial role in cement production is magnesium. Low levels of magnesium are present in natural limestone, but higher quantities are present in slag. When the raw material is heated to 1,450 degrees centigrade, magnesium oxide melts and becomes part of the liquid mass. During cooling, magnesium binds to the various minerals in the cement. However, too much magnesium can form a mineral called periclase during cooling, which can cause problems such as swelling and cracking in concrete.
To tackle this phenomenon, Erik Viggh has created a process model using advanced calculations. The model simulates the formation of the cement phases, taking into account time, temperature and the composition of the raw material. This makes it possible to predict the chemical content of the cement in all phases. Previously, only lime and silicon were included in the calculation, but now aluminum, iron and magnesium are also included.
To ensure the reliability of the model, the researchers conducted on cement samples made with varying amounts of magnesium oxide. These samples were analyzed to understand periclase formation and the diffusion of oxide between the particles during melt formation.
The results from both simulations and tests provide insights into the amount and composition of the cement phases formed during heating and cooling. These results also agree well with previously published data, confirming the importance and relevance of the research.
“The improved chemical model together with available thermodynamic data and a newly developed model for cooling has good potential for evaluating the use of alternative . The work has also identified weaknesses in previous process modeling and provides suggestions for future research efforts when developing completely new manufacturing processes for cement,” says Erik Viggh.

More information: Modeling the influence of magnesium from alternative raw materials on the chemistry of Portland cement clinker. umu.diva-portal.org/smash/record.jsf?pid=diva2%3A1789922&dswid=-2721

Provided by Umea University

Citation: Improved processing model can reduce limestone in cement production (2023, September 7) retrieved 7 May 2024 from https://phys.org/news/2023-09-limestone-cement-production.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

More information: Modeling the influence of magnesium from alternative raw materials on the chemistry of Portland cement clinker. umu.diva-portal.org/smash/record.jsf?pid=diva2%3A1789922&dswid=-2721
Provided by Umea University
Explore further
Facebook
Twitter
Email
Feedback to editors
10 minutes ago
0
1 hour ago
0
23 hours ago
0
May 6, 2024
0
May 6, 2024
0
10 minutes ago
18 minutes ago
19 minutes ago
26 minutes ago
28 minutes ago
51 minutes ago
59 minutes ago
1 hour ago
4 hours ago
4 hours ago
May 6, 2024
Apr 25, 2024
Apr 24, 2024
Apr 23, 2024
Apr 17, 2024
Apr 16, 2024
More from Chemistry
Aug 18, 2021
Dec 1, 2016
Mar 15, 2022
Feb 24, 2022
May 20, 2019
Aug 22, 2017
18 hours ago
21 hours ago
21 hours ago
22 hours ago
23 hours ago
22 hours ago
Use this form if you have come across a typo, inaccuracy or would like to send an edit request for the content on this page. For general inquiries, please use our contact form. For general feedback, use the public comments section below (please adhere to guidelines).
Please select the most appropriate category to facilitate processing of your request
Thank you for taking time to provide your feedback to the editors.
Your feedback is important to us. However, we do not guarantee individual replies due to the high volume of messages.
Your email address is used only to let the recipient know who sent the email. Neither your address nor the recipient’s address will be used for any other purpose. The information you enter will appear in your e-mail message and is not retained by Phys.org in any form.

Get weekly and/or daily updates delivered to your inbox. You can unsubscribe at any time and we’ll never share your details to third parties.
More information Privacy policy
We keep our content available to everyone. Consider supporting Science X’s mission by getting a premium account.
Medical research advances and health news
The latest engineering, electronics and technology advances
The most comprehensive sci-tech news coverage on the web

source

Leave a Reply