Straw, silicon content

From the ash samples, cross-sections were prepared and analysed by SEM. In the analysis, particle sizes and their chemical con osition were deteimined. In the analysis of chemical composition, the following elements were measured Si, Al, Fe, Ca, Mg, K, Na, Ti, P, S, Cl, (Mn), The summary results of this SEM analysis are shown in Figure 4. The con osition measured for particles was conpared with the chemical composition of ash of the feedstock straw (also indicated in Figure 4). According to the results, the most abundant substance in bottom ash was silicon, the amount of which was locally much higher than that of straw ash. The potassium content was quite equal from particle to particle. 

It has already been well known for more than two decades that it is feasible to produce SiC powders and/or whiskers by pyrolyzing rice husk [178] under an inert atmosphere, since a considerable content of colloidal amorphous silica is incorporated in husks and straws of this vegetable. It means that nature by itself is supplying a similar intimate mixture of carbon-containing molecules (cellulose) and colloidal silica like those artificially made mixtures we discussed in the last section. Thus, also in this case, silicon carbide may be formed by a carbothermal reduction process. This process starts in the temperature range 1100-1400 °C ... 

Features Compat. with dimethyl silicone fluids, aliphatic and aromatic hydrocarbon soivs. good heat stability high amine-alkyl content Properties Colorless to straw, clear to hazy liq. m.w. 31,000 sp.gr. 1.00 dens. 8.0 Ib/gal vise. 6600 cSt amine no. 54 flash pt. (PMCC) > 300 F Toxicology Alkaline material prevent contact with skin, eyes avoid breathing vapors... 

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