Sampling Cone Research Articles

Some Studies on Matrix in Silica Brick, (I)

In the first report, we have proposed “matrix brick” which is made of quartz flour through the 1600 hole/cm2 sieve mixed with abt. 5% of CaO. In mixing this “matrix” with varions amounts of coarer grains (400-1600 hole/cm2), we found that the sample cones containing less than 30% of “matrix” are more refractory, and therefore such bricks are good for use in open-hearth roof.In the second report, results of dilatometric experiments and microscopic observations of matrix bricks are given. There are two remarkable periods of mineral development during the sintering of matrix bricks; i.e.1000-1200°C cristobalite development1200-1400°C tridymite developmentThe formation of tridymite was detected byT1-inversson (α→β1 trid.) in samples fired at lower temperaturesT2-inversion (crist.→trid.) in samples fired at higher temperaturesBy comparing parmanent expansions at 1000°C in reheating the bricks, a minimum was found in samples fired at 900-1100°C, Milk of lime in green body gradully absorbs CO2 and is converted into CaCO3 at abt. 600°C, then it decomposes. At abt. 800-900°C, formation of calcium silicate was concluded from a marked shrinkage, and at abt. 1400°C it became visible under a microscope in forming ring-like shaped crystals. When fired at above 1400°C, calcium silicate diffused into the matrix, but when cooled, it recrystallized again.In the present (third) report, experimental results of parmanent expansion, porosity, apparent density and permeability are given.In the firing range of 1100°-1200°C, the apparent specific gravity of the matrix bricks has decreased from 2.60 to less than 2.40, but the porosity has also decreased and the crushing strength increased. Because there is no great change of porosity during firing, it is advisable to make quality control in green body. Increase of CaO content is good for crystal growth of Tridymite but rather decreases the it's amount, and makes expansion smaller.

Sampling Cone.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSampling Cone.C. W. KneffCite this: Ind. Eng. Chem. 1912, 4, 9, 682–683Publication Date (Print):September 1, 1912Publication History Published online1 May 2002Published inissue 1 September 1912https://doi.org/10.1021/ie50045a022RIGHTS & PERMISSIONSArticle Views8Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (288 KB) Get e-Alerts