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A pilot study of the use of South African Fe-Mn, Si-Mn, Pt-converter and matte-smelting furnace slags in composite Portland cement
The South African Mining industry produces large amounts of slag in various ore-beneficiation processes. Examples are ferro- and silico manganese alloy production in submerged arc-furnaces as well as the production of Pt-group element concentrates, where large amounts of matte-smelting converter- and furnace slag is produced. Although a portion of the slag is used in the civil and road building industry, storage is becoming an increasing environmental problem. As slag originating from the production of iron in a blast furnace, has been used in blended cements since before 1900, this study was initiated to utilize the various slag types in blended Portland cement. In this paper the use of slags from ferro- and silico manganese alloy production as well as from the production of Pt-group element concentrates, in blended cements is discussed. The results of Mn-slag blends indicate that the amount of heat developed increases with increasing cement content within each sample group. Comparison of each ratio shows that the Fe-Mn slag containing composite cements show less heat evolvement than the respective composite blast-furnace slag cement of the same ratio. Compressive strength of the cement - Mn slag mixtures is lower than that of the respective cement-corex blast furnace slag mixtures. Test results for the Pt-industry slag - cement blends show similar trends, with the Pt-converter slag - cement blends showing higher strength than that of their respective Pt-furnace slag - cement mixtures. Compressive strength tests as well has heat flow curves showing the hydration behaviour, indicate that 10-20 % addition of these slags to ordinary Portland cement is possible. The results are promising, but show variable behaviour depending on slag and cement composition. There is a large potential to use these slags in cement mixtures and this study can be used to develop cements that will positively influence CO2 emissions and help to reduce large slag stock piles.
A pilot study of the use of South African Fe-Mn, Si-Mn, Pt-converter and matte-smelting furnace slags in composite Portland cement
The South African Mining industry produces large amounts of slag in various ore-beneficiation processes. Examples are ferro- and silico manganese alloy production in submerged arc-furnaces as well as the production of Pt-group element concentrates, where large amounts of matte-smelting converter- and furnace slag is produced. Although a portion of the slag is used in the civil and road building industry, storage is becoming an increasing environmental problem. As slag originating from the production of iron in a blast furnace, has been used in blended cements since before 1900, this study was initiated to utilize the various slag types in blended Portland cement. In this paper the use of slags from ferro- and silico manganese alloy production as well as from the production of Pt-group element concentrates, in blended cements is discussed. The results of Mn-slag blends indicate that the amount of heat developed increases with increasing cement content within each sample group. Comparison of each ratio shows that the Fe-Mn slag containing composite cements show less heat evolvement than the respective composite blast-furnace slag cement of the same ratio. Compressive strength of the cement - Mn slag mixtures is lower than that of the respective cement-corex blast furnace slag mixtures. Test results for the Pt-industry slag - cement blends show similar trends, with the Pt-converter slag - cement blends showing higher strength than that of their respective Pt-furnace slag - cement mixtures. Compressive strength tests as well has heat flow curves showing the hydration behaviour, indicate that 10-20 % addition of these slags to ordinary Portland cement is possible. The results are promising, but show variable behaviour depending on slag and cement composition. There is a large potential to use these slags in cement mixtures and this study can be used to develop cements that will positively influence CO2 emissions and help to reduce large slag stock piles.
A pilot study of the use of South African Fe-Mn, Si-Mn, Pt-converter and matte-smelting furnace slags in composite Portland cement
Pilotuntersuchung zur Verwertung von südafrikanischen Schlacken aus Fe-Mn-, Si-Mn- und Pt-Konvertern und Steinschmelzöfen zur Herstellung von Portland-Verbundzementen
Verryn, Sabine M.C. (author) / Pöllmann, Herbert (author) / Kearsley, Elsabe (author)
2005
4 Seiten, 4 Bilder, 1 Tabelle, 2 Quellen
Conference paper
English
Study on steel furnace slags with high MgO as additive in Portland cement
| British Library Online Contents | 2002
Study on steel furnace slags with high MgO as additive in Portland cement
| Tema Archive | 2002
Study on steel furnace slags with high MgO as additive in Portland cement
| Online Contents | 2002
Study on steel furnace slags with high MgO as additive in Portland cement
| Online Contents | 2002