Uticaj sadržaja vlage na meljivost kolubarskih lignita

Abstract

U cilju dobijanja podataka o uticaju sadržaja vlage na meljvost ugljeva izvršena su eksperi-mentalna istraživanja. Eksperiment je obuhvatio šest uzoraka ugljeva kolubarskog basena. Izbor uzoraka je izvršen u zavisnosti od eksperimentom dobijenih vrednosti Hadrgrove indeksa meljivosti (HGI) sa ciljem da se pokrije celokupna oblast eksperimentalno dobijenih vrednosti HGI. Pored određivanja HGI, a sve uzorke je izvršena tehnička, organo-geoemijska i petrografska analiza.Ligniti su u vlažnom stanju po svojoj prirodi žilavi, mekani i masni. Snižavanjem sadržaja vlage ligniti postaju krhkiji. Iz ovog razloga, vrednosti HGI imaju različite vrednosti ukoliko se određuju pri različitim sadržajima vlage.Hardgrove indeks meljivosti ugljeva (HGI) ima nelinearnu zavisnost od udela vlage u uglju. Sve krive imaju dve prevojne tačke, jedan minimum i jedan maksimum vrednosti HGI u ispitivanoj oblasti. Minimalne vrednosti HGI ima u intervalu 15 –22% masenog udela ukupne vlage u uglju, dok maksimalne vrednosti HGI ima za sadržaj ukupne vlage 5 –13%.

In order toobtain data on the impact of moisture content on the grindability of coals, experi-mental research was conducted. The experiment included six samples of coal from the Kolubara basin. The samples were selected based on experimentally obtained values of their Hardgrove grindability index (HGI), in order to cover the entire range of experimental HGI values. In addition to determining the HGI, proximate, organo-geochemical, and petrographic analyses were per-formed on all samples.Lignites are naturally tough, soft, and greasy when in a moist state. By reducing the moisture content, lignites become more brittle. For this reason, HGI values have different values depending on the moisture content at which they are determined.The Hardgrove grindability index of coal (HGI) has a nonlinear dependence on the moisture content of the coal. All curves have two inflection points, one minimum and one maximum value of HGI in the tested range. The minimum values of HGI are in the range of 15 –22% of the mass frac-tion of total moisture in coal, while the maximum values of HGI are for a total moisture content of 5 –13%.