11 th Conference on Environment and Mineral Processing Part III

Transcription

1 VŠB TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF MINING AND GEOLOGY INSTITUT OF ENVIRONMENTAL ENGINEERING 11 th Conference on Environment and Mineral Processing Part III VŠB-TU OSTRAVA Czech Republic

2 INTERNATIONAL SCIENTIFIC COMMITEE Susana L. Arad Technical University of Petrosani, Romania Gordan Bedekovic University of Zagreb, Croatia Paolo Bevilacqua University of Trieste, Italy Wieslaw S. Blaschke Polish Academy of Sciences, Cracow Ana Maria Celeda Intemin, San Martín, Argentina Vladimír Čablík VŠB - Technical University of Ostrava, Czech Republic Peter Fečko VŠB - Technical University of Ostrava, Czech Republic Zhenqi Hu China University of Mining and Technology (Beijing), China Andrzej Jarosiński Cracow University of Technology, Cracow, Poland Viatcheslav V. Kafarov Universidad Industrial de Santander, Bucaramanga, Colombia Sanda Krausz Technical University of Petrosani, Romania Radmila Kučerová VŠB - Technical University of Ostrava, Czech Republic Mária Kušnierová Slovac Academy of Science Košice, Slovakia Tamara Matveyeva Russian Academy of Sciences, Moscow, Russia Wladyslawa Mulak Technical University of Wroclaw, Poland Gülhan Özbayoğlu Middle East Technical University, Ankara, Turkey Jorge Pérez Instituto Politécnico Nacional, E.S.I.Q.I.E., Mexico Mario Sanchez University of Concepcion, Chile Rudolf Tomanec Universtiy of Belgrade, Serbia Barbara Tora University of Mining and Metallurgy Cracow, Poland Edita Virčíková Technical University of Košice, Slovakia ORGANIZING COMMITTEE Chairman Peter Fečko Members Eva Bogdanová Vladimír Čablík Barbora Lyčková Gabriela Lyčková Miluše Hlavatá Nikolas Mucha Anna Pavlisková Iva Janáková Eva Pertile Monika Mádrová Radka Štěpánová Jaroslav Závada REVIEWERS Prof. Ing. Peter Fečko, CSc. VŠB-TU Ostrava Doc. Ing. Dagmar Juchelková, Ph.D. VŠB-TU Ostrava Doc. Ing. Mária Kušnierová, CSc. SAV Košice Doc. Ing. Františka Michalíková, CSc. TU Košice Doc. Ing. Helena Raclavská, CSc. VŠB-TU Ostrava Doc. Dr.inž. Barbara Tora AGH University of Science and Technology, Kraków Ing. Tomáš Bouchal, Ph.D. Sedrus, s.r.o. Ing. Vladimír Čablík, Ph.D. VŠB-TU Ostrava Ing. Martin Drobík, Ph.D. OTIS a.s. RNDr. Radim Havelek, Ph.D. VŠB-TU Ostrava Ing. Miluše Hlavatá, Ph.D. VŠB-TU Ostrava Ing. Slavomír Hredzák, Ph.D. SAV Košice Dr. Ing. Radmila Kučerová VŠB-TU Ostrava Ing. Alena Luptáková, Ph.D. SAV Košice ISBN

3 Vyvážil M., Ledererová J., Svoboda M., Chromková I., Tichá J.: TECHNOLOGICAL SUITABILITY OF SECONDARY ENERGETIC PRODUCTS FOR ARTIFICIAL AGGREGATE PRODUCTION TECHNOLOGICAL SUITABILITY OF SECONDARY ENERGETIC PRODUCTS FOR ARTIFICIAL AGGREGATE PRODUCTION Martin VYVÁŽIL, Jaroslava LEDEREROVÁ, Miroslav SVOBODA, Ivana CHROMKOVÁ, Jaroslava TICHÁ Research Institute of Building Materials, JSC., Hněvkovského 5, 17 Brno, Czech Republic Abstract Processing of secondary energetic products is significant possibility of natural sources substitution, which are currently used in production of building matters, e.g. aggregate. Technological suitability is assessed in laboratory and pilot plant conditions, which simulate real conditions of technological processing of given material. On test specimens are provided appropriate tests, which are necessary for assessment of artificial aggregate for given purpose and environment of utilization (e.g. strength characteristics, bulk density, usable durability, volume stability, etc.). Key words: technological suitability, secondary energetic product, artificial aggregate Introduction Artificial aggregate is divided according to bulk density compact aggregate with bulk density over kg/m 3 and porous aggregate with bulk density below kg/m 3. Presently is solved possibility of artificial aggregate production on base of fly ash, produced by cold way. In the frame of this problem solution have to be defined methodology of assessment of technological suitability of produced aggregate for given purpose and environment of utilization. Part of methodical assessment is determination of suitable test procedures. Seeing that it is product from waste materials, it have to be determined not only technological suitability, which is assessed on base of physically chemical properties, but ecological suitability as certificate its health unexceptionability too. Methodical procedure Procedure of solution for technological suitability definition consits of two concured phases: tests on laboratory test specimens tests on pilot plant specimens (pellets, granules) In frame of laboratory testing of artificial aggregate production by cold way were chosen two types of fly ashes one from high-thermal combustion and one from fluid way of combustion. Both types of fly ashes were used ether separately or created major share in raw material mixture. As test specimen were chosen rollers compacted by pressure kn. It simulates production of pellets or granules at assessed porosity. Figure No. 1. Compacted roller (height and average cca 3 mm) There were prepared cca 3 prescriptions. From every prescription were produced 3 test rollers. Rollers were deposited in humid environment. In stated intervals 3, 7 and days were assessed following parameters on them: visual assessment of body state compressive strength transverse pressure strength bulk density humidity Selected composition of prescriptions and results of these parameters assessment are stated in Table No.1. 9

4 Compressive strength 11 th Conference on Environment and Mineral Processing Table No 1 Prescriptions (content of components in %) Classical fly ash Pk 35/ Fluid fly ash Pf 39/ Ground slag St 9/ Fluid ash from bottom Pf 3/1 Water-cement ratio,,5,,,3,3,,5,5,5,5, Bulk density after production [kg/m 3 ] Bulk density after3 days [kg/m 3 ] Bulk density after 7 days [kg/m 3 ] Bulk density after days [kg/m 3 ] Compressive strength after 3 days, 5,,1 1,,1, 1,,3 7, 7,3 7,3, Compressive strength after 7 days,,,,1,,1 1,,3 17, 7,9,3,1 Compressive strength after days 1,3,3 3,,9,,,,9 1,3 9,7 9, 7, Transverse pressure strength after 3 days,3 1,3 1,,7,,,5 3, 5, 3, 3,7 3,1 Transverse pressure strength after 7 days, 1,7 1, 1,,5 1,7,9, 5,7 3,9,3 3,9 Transverse pressure strength after days 1,5 1,3,1,3,,9 5,1,3 5,5 5, 3,7 Humidity after 3 days [%], 3, 3,1 1,5 17,3 1,9, 3, 5,3 39,9,7 39, Humidity after 7 days [%] 15,3 3,,7 11,3 1, 11, 17,,7 39,1 1, 1,7 5,7 Humidity after days [%] 7,1,7 11,, 11,,9 9, 1,,3 7, 7, 1,9 In following charts is illustrated development of compressive strength and bulk density at selected compositions depending on time of ageing: 1 1 presc.1 - Compressive strength presc. - Compressive strength presc.3 - Compressive strength presc.1 - presc. - presc.3-3 days 7 days days Chart 1. Compressive strength and bulk density at compositions on base of high-thermal and/or fluid combustion products 7

5 Compressive strength Compressive strength Compressive strength Vyvážil M., Ledererová J., Svoboda M., Chromková I., Tichá J.: TECHNOLOGICAL SUITABILITY OF SECONDARY ENERGETIC PRODUCTS FOR ARTIFICIAL AGGREGATE PRODUCTION 1 1 presc.1 - Compressive strength presc. - Compressive strength presc.5 - Compressive strength presc.1 - presc. - 3 days 7 days days 1 presc.5 - Chart. Compressive strength and bulk density at prescriptions on base of high-thermal combustion products with 5% and 15% cement addition (prescriptions and 5) days 7 days days 1 1 presc. - Compressive strength presc. - Compressive strength presc.9 - Compressive strength presc. - presc. - presc.9 - Chart 3. Compressive strength and bulk density at prescriptions on base of fluid combustion products with 5% and 15% cement addition (prescriptions and 9) presc.1 - Compressive strength 1 presc. - Compressive strength presc.7 - Compressive strength presc.1 - presc. - presc.7-3 days 7 days days 1 Chart. Compressive strength and bulk density at prescriptions of products on base of high-thermal combustion products, with 5 % cement addition and % ground slag (prescription 7) or % ground bottom ash from fluid combustion (prescription ) 71

6 Compressive strength Bulk density [kg/m 3 ] 11 th Conference on Environment and Mineral Processing 1 1 presc. - Compressive strength presc. - Compressive strength 1 presc.11 - Compressive strength presc. - Compressive strength presc. - presc. - presc.11-1 presc. - 3 days 7 days days Chart 5. Compressive strength and bulk density at prescriptions of products on base of fluid combustion with 5% cement addition and different rates of ground slag (prescription 5%, prescription 11 %, prescription 15%) Summary of results From graphic processing of results follows: - Chart No. 1 represents comparison compact mixture of different types of ashes with optimal water quantity (see table No. 1). Wet compact mixture on base of fluid combustion products achieves cca fivefold compressive strength compared to compact mixture on base of high-thermal combustion products. Double growth of compressive strength occured in case of combination of fluid and high-thermal combustion products. - Chart No. represents influence of different cement content on growth of compressive strength of wet compact mixture on base of high-thermal combustion products. - Chart No. 3 represents influence of different cement content on growth of compressive strength of wet compact mixture on base of fluid combustion products. - Chart No. represents comparison of addition ground slag or ground bottom ash from fluid combustion influence on compressive strenth and bulk density of wet compact mixture on base of high-thermal combustion products with 5% cement content. Addition of ground bottom ash is from technological point of view more effective. - Chart No. 5 represents influence of different content of ground slag on compressive strength and bulk density of wet compact mixture on base of fluid combustion products and 5% cement addition. Increasing addition of ground slag instead of fluid fly ash expresses negatively. Conclusion From the technological point of view unambiguously results suitability of fluid combustion products utilization for artificial aggregate production. This aggregate has very good strength characteristics in relation to bulk density. At suitable properties of fluid combustion product it is possible to produce artificial porous aggregate without cement addition. It can represent significant economical contribution. In case of high-thermal products utilization is necessary to think over cement content cca 5% and event addition of ground bottom ash from fluid combustion for increasing of strength characteristics. In case of slag addition into mixture with above mentioned secondary combustion products was not proven its positive contribution. This paper was created with support of research centrum Ministry of Education CR No. 1M7,,Research centrum of integrated utilization of by-products from mining, adjustment and processing of energetic raw materials. 7

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