含酸性杂质的氟石膏(pH=3左右)对水泥各项指标稍有影响,不影响水泥强度和安定性,符合国家标准要求,但严重影响水泥与外加剂的相容性,会使水泥净浆或混凝土产生“速凝”现象,产生“速凝”的原因是氟石膏中混有HF杂质呈强酸性。若使用该氟石膏且不改变水泥的使用性能,那么可以对该氟石膏进行碱中和处理,但处理成本会很高,需综合考虑。建议水泥企业在使用氟石膏时,一定要进行常规检测以外的检测,如:pH值检测、水泥外加剂相容性检测等,还可以要求氟石膏供应厂家进行检测或处理好氟石膏污染杂质,避免氟石膏所含有的常规检测项以外的杂质对于水泥及混凝土性能的影响。 Fluorogypsum containing acidic impurities (pH = 3 or so) has a slight impact on various indicators of cement, does not affect the strength and stability of cement, in line with national standards, but seriously affect the compatibility of cement and admixture, will cement Pulp or concrete produce “quick setting ” phenomenon, resulting in “quick setting ” because the fluorine gypsum mixed with impurities is strongly acidic. If the fluorogypsum is used without changing the serviceability of the cement, the fluorogypsum may be subjected to alkali neutralization treatment, but the treatment cost will be very high and needs to be considered synthetically. Proposed cement enterprises in the use of gypsum, we must conduct routine testing other than testing, such as: pH testing, cement admixture compatibility testing, but also can require the supply of fluorine gypsum manufacturers to detect or deal with fluorine gypsum contamination of impurities, Avoid the influence of impurities other than the conventional test items contained in fluorogypsum on the properties of cement and concrete.