Regarding the problem of ashing during analysis of fly ash solid samples
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When analyzing solid samples of fly ash, the dried fly ash needs to be ashed first. I would like to ask everyone, in addition to the removal of crystal water and the oxidation of unburned carbon, what other chemical changes occur during the ashing process of fly ash? If it is not ashed, can we directly use chemical titration to analyze the content of each component? Why?
A. Moisture and volatile substances are released in gaseous state B. CHN and O2 in organic matter generate CO2.NO2.H2O, etc. and are lost. C. Metal salts of organic acids are converted into carbonates or metal oxides； D. Some components are converted into oxides, phosphates, sulfates or halides E. Some metals evaporate directly or form easily volatile metal compounds
I have the following questions about your reply: When coal is fired in a power plant, the temperature is above 1,000 degrees Celsius. Moisture and organic matter should be lost and should not remain in the coal ash!