Assertion: organic free soda ash | /r/CapableOf | give low foam index
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Source sentences:
text: The crystals produced by any of these alternatives may be passed to calciner 39, such as a rotary gas fired calciner Where they are calcined in a non-reactive atmosphere at temperatures between 450 C. and 800 C. for a time sufficient to volatilize substantial amounts of organic irnpurities therefrom and to convert the remainder of the organic impurities to `a coke and to densify the ash, giving an organic-free dense soda ash which gives a low foam index when mixed with phosphoric acid and which when heated with phosphoric acid produces a sodium tripolyphosphate havin-g a reflectance above about 85.