Sintering point

It was also shown both theoretically and experimentally (Tardos et al., 1985a,b) that there is a strong correlation between the excess temperature above the minimum sintering point, T-Ts, and the excess gas velocity above minimum fluidization conditions (measured below the sintering point) U-lJm required to maintain fluidization. A general correlation was developed between the excess temperature and the excess gas velocity, which takes the form... 

One can see in Figure 107 that the fluidity of polymers made with each catalyst rises with rising activation temperature up to the point of sintering, after which the fluidity turns down. The sintering point occurs at... 

There are some components which may be regarded as anionic trash that are beneficial to rosin sizing such as saccharinic acids from alkaline pulping and hemicelluloses from unbleached pulps. These can form complexes with AP+ ions and produce rosin size precipitates of lower melting or sintering points. This promotes more efficient sizing. 

Perhaps the best place to start the discussion of cement standards is with a definition. Natural cement is currently defined in ASTM C 219 as a hydraulic cement produced by calcining a naturally occurring argillaceous [clayey] limestone at a temperature below the sintering point and then grinding to a fine powder [1]. 

Due to their respective firing temperatures, natural cement s hydraulic species is primarily dicaldum silicate (C2S), formed below the sintering point. The tricaldum silicate and tricalcium aluminate ( 38,03A) typically formed above the sintering point in portland cement production are absent. 

The Second American Natural Cement Conference adopted a convention which defined natural cement in terms of the historic American standard ASTM C 10 Standard Specification for Natural Cement). This standard was first adopted over a hundred years ago. European cements do not meet this standard due to excessively rapid time of setting, and in some cases, burning at temperatures reaching the sintering point. 

Weight loss was measured after sintering, pointing to the formation of gaseous species. 

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