{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-W6W5RVFN/ed76c4d9-2260-4ced-af0d-ab8ce2eac4ec/HTML","dcterms:extent":"15 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-W6W5RVFN/acf2e477-d2fb-4888-9261-e1cc3f55a7ea/PDF","dcterms:extent":"629 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-W6W5RVFN/fce613d9-9839-46e9-bae8-09d94f972c95/TEXT","dcterms:extent":"14 KB"}],"edm:TimeSpan":{"@rdf:about":"1992-1999","edm:begin":{"@xml:lang":"en","#text":"1992"},"edm:end":{"@xml:lang":"en","#text":"1999"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:doc-W6W5RVFN","edm:isNextInSequence":{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:doc-V2VCVZXF"},"dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-QKUCN2BD"},{"@xml:lang":"sl","#text":"Kovine zlitine tehnologije"}],"dcterms:issued":"1997","dc:creator":["Mirtič, Breda","Umek, Urban"],"dc:format":[{"@xml:lang":"sl","#text":"3 strani"},{"@xml:lang":"sl","#text":"številka:3/4"},{"@xml:lang":"sl","#text":"letnik:31"},{"@xml:lang":"sl","#text":"str. 223-225"}],"dc:identifier":["ISSN:1318-0010","COBISSID:66474","URN:URN:NBN:SI:doc-W6W5RVFN"],"dc:language":"sl","dc:publisher":[{"@xml:lang":"sl","#text":"Inštitut za kovinske materiale in tehnologije"},{"@xml:lang":"sl","#text":"Železarna Jesenice"},{"@xml:lang":"sl","#text":"Železarna Ravne"},{"@xml:lang":"sl","#text":"Železarna Štore"}],"dc:subject":[{"@xml:lang":"sl","#text":"cementni klinkerji"},{"@xml:lang":"sl","#text":"diferenčna termična analiza"},{"@xml:lang":"sl","#text":"kemijska analiza"},{"@xml:lang":"sl","#text":"kovinski oksidi"},{"@xml:lang":"sl","#text":"mineralne surovine"},{"@xml:lang":"sl","#text":"rentgenska difrakcija"},{"@rdf:resource":"http://www.wikidata.org/entity/Q2346"}],"dcterms:temporal":{"@rdf:resource":"1992-1999"},"dc:title":{"@xml:lang":"sl","#text":"Karakterizacija surovin za žganje cementnega klinkerja| Characterization of raw materials for cement clinker burning|"},"dc:description":[{"@xml:lang":"sl","#text":"Cement clinker is smade from raw material with suitable chemical and mineralogical composition. Marl, with addition of limestone as the source of lime; quartz, flysch rock or other raw material rich with silicates as the source of silica; bauxite as the source of alumina and pyrite roastes as the source of iron oxide are the most common used raw mateials. Raw material may contain minerals which introduce sulphur into the raw mixture, as pyrite. Sulphur may cause the emission of ?$SO_3$? into the environment. The equivalent amount of alkali oxides in the raw mixture avoids the emission of ?$SO_3$?. Alkali oxides with ?$SO_3$? form alkali sulphates. Solid alkali sulphates leave the kiln together with clinker. With chemical analysis , 1.21-2.47 mass.% of ?$SO_3$? was determined in particular components of raw mixture. Investigation of the raw components with the x-ray diffraction could not incontestabily prove the presence of pyrite, because the pyrite amount was under the detection limit. STA measurements of the investigated samples demonstrated an exothermic reaction characteristics for the oxidation of pyrite at the temperatures from 440°C to 455°C and the corresponding weight loss as well. According to the weight loss the amount of ?$SO_2$? was calculated and subsequently the amount of pyrite. The investigated raw components contain from 0.5 d0 1.4 mass.% of pyrite"},{"@xml:lang":"sl","#text":"Cementni klinker izdelujemo iz mineralnih surovin z ustrezno kemično in mineralno sestavo. Najpogosteje se uporablja lapor, ki mu po potrebi dodajamo še apnenec kot nosilec karbonaatne komponente, kremen, flišne kamnine ali kakšno drugo, s silikati bogato surovino kot nosilce ?$SiO_2$?, boksit kot vir?$Al_2O_3$? in piritne ogorke kot vir ?$Fe_2O_3$?. Surovina lahko vsebuje minerale, ki vnašajo v surovinsko mešanico žveplo, npr. pirit. Le-to lahko povzroča nezaželeno oddajanje ?$SO_3$? v ozračje. Emisijo ?$SO_3$? preprečimo, če surovinska mešanaica vsebuje ekvivalentno količino alkalijskih oksidov, ki se z ?$SO_3$? vežejo v alkalijske sulfate in skupaj s klinkerjem v trdni obliki zapustijo peč. V posameznih komponentah surovinske mešanice je bilo s kemično analizo ugotovljeno 1,21 do 2,47 mas.% ?$SO_3$?. Preiskava vseh surovinskih komponent z rtg-difrakcijo ni dala nedvoumnega dokaza o piritu kot nosilci žvepla, ker je bila njegova vrednost pod mejo določljivosti. Meritve s simultanim termičnim analizatorjem so v preiskanih vzorcih pokazale na krivulji DTA eksotermni odklon, značilen za oksidacijo pirita pri temperaturi 440°-455°C, ter ustrezno izgubo mase, ki spremlja to reakcijo. Iz izgube mase smo sklepali na količino ?$SO_2$? in iz nje izračunano vsebnost pirita. V preiskovanih surovinskih komponentah je bilo 0,5-1,4 mas.% pirita"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:doc-W6W5RVFN","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-W6W5RVFN"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-W6W5RVFN/acf2e477-d2fb-4888-9261-e1cc3f55a7ea/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:dataProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:doc-W6W5RVFN/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-W6W5RVFN"}}}}