Ignition weight loss

The ignition weight loss figures, which show the percentages of uncombusted materials, for both the Japanese and the U.S. refuse are substantially lower than the standard Japanese values obtained with the conventional stoker type incinerator, which are below 10 wt.% for a furnace of less than 200 Mg/d and below 7% for a furnace of more than 200 Mg/d. 

Many of the procedures used for technical analysis of aluminum hydroxides are readily available from the major producers of aluminum hydroxides. Phase Composition. Weight loss on ignition (110°—1200°C) can differentiate between pure (34.5% Al(OH)2) ttihydroxides and oxide—hydroxides (15% Al(OH)2). However, distinction between individual ttihydroxides and oxide —hydroxides is not possible and the method is not useful when several phases are present together. X-ray powder diffraction is the most useful method for identifying and roughly quantifying the phase composition of hydroxide products. 

Heat Test, 100°. Betw 0 and 48 hours, 1% weight loss betw 48 and 96 hours, 0.6% weight loss no explns after 100 hours (Ref 10) Ignition and Unconfined Burning Test. All UFAP samples ignited and burned without expln (Ref 48, p 56)... 

Note The EC method also specifies a blank determination, where the weight loss on ashing should not exceed 4 mg. This should be subtracted from the loss in weight of the sample on ignition when calculating the % crude fibre. 

Loss on Ignition Ignite the sample retained from the test for Loss on Drying at 900° to 1000° for 20 min, and calculate the percent weight loss. 

Transfer the filter paper and precipitate into a tared platinum crucible, char, and ignite at 900° to constant weight. Moisten the residue with a few drops of water, add 15 mL of hydrofluoric acid and 8 drops of sulfuric acid, and heat on a hot plate in a hood until white fumes of sulfur trioxide evolve. Cool add 5 mL of water, 10 mL of hydrofluoric acid, and 3 drops of sulfuric acid and evaporate to dryness on the hot plate. Heat cautiously over an open flame until sulfur trioxide fumes cease to evolve, and ignite at 900° to constant weight. The weight loss after the addition of hydrofluoric acid represents the weight of Si02 in the sample taken. 

The loss above 550°C is due partly to CO2 and partly to the final stages of dehydration of C-S-H and the hydrated aluminate phases. It is not practicable to distinguish the contributions from TG evidence alone, and, unless evolved gas analysis is used, a separate determination of COj should be made. As with calcium silicate pastes, serious errors arise if TG determinations are carried out on material that has been treated with an organic liquid, e.g. to stop hydration. Losses above 550°C of more than about 3%, referred to the ignited weight, indicate serious carbonation either from this or other causes. 

The conventional approach to asphalt analysis has been to extract the bitumen with an organic solvent and then to characterize bitumen and minerals separately. Sulfur content and melting point are commonly measured properties of bitumen. Minerals are generally screened and then subjected to simple quantitative tests. Measurement of weight loss on ignition helps to distinguish between calcium carbonate, which loses... 

Following this lead, Martin and coworkers proceeded with acquisition of further data to clarify the ignition behavior of cellulose, but they rejected the use of ElR as being artificial because of the substantial variation in the overall weight-loss activation energy among the cellulosic materials. However, they found that the hypothetical, heat-flow model serves as a convenient device for correlation of their experimental results and the interpretation of the ignition behavior. 

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