Korelacija uslova dobijanja i kvaliteta briketa krečnjaka za upotrebu u kalcizaciji kiselih zemljišta Naučni rad
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U radu su prikazani rezultati eksperimenata koji su sprovedeni da bi se utvrdilo kako količina veziva (bentonita) i parametri laboratorijske valjkaste (rol) prese utiču na kvalitet briketa dobijenih od krečnjačkog praha. Ovi eksperimenti imaju za cilj ispitivanje uslova u kojima se formiraju briketi krečnjaka i utvrđivanje mogućnosti njihove upotrebe u poljoprivredi. U toku eksperimenata krečnjaku su dodavani različiti maseni udeli bentonita (od 1 do 10 %), dok se sila valjaka prese kretala od 2 do 25 kN. Briketi su analizirani primenom skenirajuće elektronske mikroskopje (SEM), diferencijalno termičkih analiza (DTA/TG) i infracrvene spektroskopije sa Furijeovom (Fourier) transformacijom (FTIR). Utvrđena je ravnomerna distribucija bentonita, kao i kompaktnost briketa, bez stvaranja novih jedinjenja. Eksperimenti su takođe pokazali da tokom briketiranja svojstva krečnjaka ostaju nepromenjena, promene su samo fizičke, rastvorljivost u vodi nije smanjena, mehanička svojstva (otpornost na udar, čvrstoća na pritisak i otpornost na abraziju) su zadovoljavajuća prema uslovima transporta i skladištenja, ako je maseni udeo veziva preko 5 % i sila briketiranja prelazi 10 kN i, konačno, nema gubitaka usled raspršivanja vetrom tokom nanošenja. Jedini nedostatak dobijenih „zelenih“ briketa je vreme koje je potrebno za njihovu potpunu dezintegraciju ako su potopljeni u vodu.
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Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
Grant numbers 451-03-68/2022-14/200023
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