Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Svavelhaltsmätning av bränd kalk från Rättvik
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This thesis project was carried out by two students on behalf of SMA Mineral AB, which owns the lime plant in Rättvik, where there was need to establish a sampling method for the local quick lime product. The aim was to ensure a maximum concentration of impurities in the product—primarily carbon and sulphur. The mean value of sulphur found in the input material varied over time. Consequently, a suitable statistical method was needed to ensure product quality for the prospective customer as they required that the sulphur content of the proposed product never exceed 500 ppm.The aim was, on the one hand, to process and compile the sampling results in accordance with a suitable statistical method which enabled reasonable conclusions about the product quality and, on the other hand, to answer three key queries that SMA Mineral AB posed:• to investigate whether the product’s sulphur content was affected during conveyance through the lime plant;• to investigate whether sampling at various time intervals may have been a factor which affected the product’s sulphur content;• to investigate whether there was, or were, any particular times of day at which the sulphur content always maintained the correct level.A number of phases were required to find answers to these questions. The planning phase was initiated by a visit to Rättvik, with the purpose of gaining an overall picture of how work at the plant was conducted as well as which guidelines and regulations were in effect. After this visit, a project plan was drawn up in order to serve as support for further work.The sampling campaign took place during the period of 13–16 April 2015 and analysis of the collected material was carried out the following week at the company’s laboratory in Persberg, Sweden. However, the results from the sampling campaign did not provide sufficient basis for answering the company’s questions, which is why data from SMA Mineral AB’s own data collection was used. Data collected during the sampling campaign proved to follow normal distribution. Subsequently, the statistical analysis of variance method, ANOVA, was applied in order to investigate whether the sulphur content changed with respect to the time interval and the sampling site. The test results demonstrated p-values under 0.005, which meant that neither the sampling site nor the sampling time intervals had an effect on the product’s sulphur content. The company’s question, whether there were daily time intervals of acceptable sulphur content in the product, was answered with the assistance of the company’s own data collection, which demonstrated that it did not follow normal distribution. For that reason, the bootstrap method was used to create confidence intervals for the different points in time. The result showed that there were no points in time during which acceptable material was produced. One reason for this is the occurrence of a set of deviating values that were observed to have a sulphur content that exceeded 1,000 ppm. This report presents recommendations for various measures independently of any opinions SMA Mineral AB may have concerning the source of these values and whether they can possibly be avoided.

Place, publisher, year, edition, pages
2016. , 44 p.
Keyword [en]
Technology, quick lime, sampling, Bootstrap method
Keyword [sv]
Teknik, Bränd kalk, provtagning, Minitab, ANOVA, Bootstrapmetoden
Identifiers
URN: urn:nbn:se:ltu:diva-59100Local ID: fa0b1c59-ff7e-43e4-b4d3-8feb3a68f83bOAI: oai:DiVA.org:ltu-59100DiVA: diva2:1032488
Subject / course
Student thesis, at least 15 credits
Educational program
Mining and Geotechnical Engineering, bachelor's level
Supervisors
Examiners
Note
Validerat; 20160612 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(2578 kB)47 downloads
File information
File name FULLTEXT01.pdfFile size 2578 kBChecksum SHA-512
59a58490a1b53acf161c9b03881a482fcdd54e680c003cd2c71e5aa73d8fb2697bea7e3801dadc5112c46066bceaa1592892cf63f28fc8e0ca0b656ee06a2e99
Type fulltextMimetype application/pdf
fulltext(1681 kB)21 downloads
File information
File name FULLTEXT02.pdfFile size 1681 kBChecksum SHA-512
0207f83a5b61727e29031e8e89bfd4dbde9b88b11770c148e17c41fb846e915674e0908714c457d24ba77c74fc635a5515c1c7d787cd8fa21f82bc89aab7e5c3
Type fulltextMimetype application/pdf

Search outside of DiVA

GoogleGoogle Scholar
Total: 68 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 34 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf