Ash Characteristics and Selected Critical Elements (Ga, Sc, V) in Coal and Ash in Polish Deposits

Abstract

The chemical composition of coal ash and the content of the critical elements Ga, Sc, and V in coal and ash are examined herein. In this study, lignite and bituminous coal from Polish deposits were used. The coals were subjected to ultimate and proximate analysis; the petrographic composition was determined based on maceral groups. The chemical composition of ash and the content of critical elements were determined using ICP-MS. The obtained results were correlated and Pearson’s linear correlation coefficient was determined. Based on the correlation analysis, the relationship between the chemical composition of ash and the proximate and ultimate analyses was demonstrated. The content of selected critical elements in the tested deposits was lower than the Clarke value in coal. However, in some deposits these contents are much higher in coal ashes. The higher levels of Ga, V, and Sc in the ash are associated with Al2O3. Therefore, it can be stated that ashes can be a potential source of some raw materials. The highest concentrations of critical elements in coal and ash were recorded in the Lublin Coal Basin. Supra-Clarke contents of Ga, V, and Sc were recorded in the Bogdanka coal mine.

Effective direct chemical looping coal combustion using bimetallic Ti‐supported Fe2O3‐MnO2 oxygen carriers

“…Hard coal is known to contain high amounts of silicon dioxide (up to 50%) 57 and alkalis that could potentially react with the reduced metals. The literature shows the formation of transition metal silicates such as (Fe,Mn)SiO 3 or oxides containing both alkaline and transition metals such as CaMnO 3 or Ca 2 Fe 2 O 5 58,59 .…”

Possibilities of valorization of Gnetum spp leaves in modern gastronomy: Production and characterization of new vegetable tarts and salads

“…The difference can be attributed to the quantities of the Gnetum leaves in these different food products since the other ingredients were kept constant. The high values of ash in tart samples indicate the presence of significant amount of minerals [ [26] , [27] , [28] ].…”

Selected Critical Raw Materials in Waste from Coal Gasification in Poland

“…It is mainly used in the production of non-ferrous alloys, highly resistant carbon steels, and in the chemical, glass, ceramic, dyeing, and photographic industries. Vanadium can be associated with and obtained from coal deposits [11]. In China, about 87% of vanadium is obtained from stone coal [25,67,68].…”

“…With the increasing shortages of critical raw materials, there are ongoing efforts worldwide aimed at obtaining them from other sources. One of these sources may be waste from energy processes such as coal combustion or gasification [9][10][11][12][13][14][15][16][17][18][19][20]. With regard to individual critical raw materials, certain features, on the basis of which we can talk about the profitability of their recovery and extraction, are determined.…”