Extraction Techniques for Concentration of Clinker Silicates and Matrix

EXTRACTION TECHNIQUES FOR CONCENTRATION OF CLINKER SILICATES AND MATRIX 

If a clinker sample is to be subjected to the extraction, a random sample of 1- to 2-mm crushed clinker particles, taken from the same fraction as previously prepared for polished section examination, is further crushed in a mortar and pestle until all the subsample passes a 75- j,m screen (No. 200 mesh). If acement is to be treated, a random sample of approximately 10 grams is sieved to produce the 45- to 75-pm fraction (325 to 200 mesh) particles left on the 75- j,m screen could be further crushed to pass the screen or, perhaps, studied microscopically to determine belite nest percentage. Sieving, however, is an optional step the main benefit is that it provides a uniformly sized powder promoting a relatively uniform level of focus by removing boulders that may interfere with examination and particle manipulation. If sieve confaminafion is a likely problem, one can use disposable nylon with the proper mesh opening. 

Wet sieving with isopropyl alcohol produces a dust-free powder and dries quickly. Some workers prefer to treat the sample without sieving or washing, thus wet sieving is also considered optional. 

Place the dried powder in a small labeled vial or other suitable storage container. 

On a 125-mm diameter, heavy duty watch glass or small beaker (200 mL) placed on a ceramic triangle on a hot plate, add approximately 10 mL of fhe 

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