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Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate
Drying phosphate gypsum - without escape of fluorine by adding calcium oxide/hydroxide/carbonate
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机译:干燥磷酸盐石膏-通过添加氧化钙/氢氧化物/碳酸钙而不会逸出氟
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摘要
Contamination of the atmosphere and corrosion of the drying apparatus are prevented by adding to gypsum a minor amt. of CaO, Ca(OH)2 or CaCO3, and heating the mixture at 200-600 degrees C. The presence of a small amt. of fluorine (e.g. 0.27 wt %) improves the quality of the subsequently produced Portland cement.
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