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萤石中氟化钙校正值的确定,通常采用纯萤石来进行,但手续烦琐。本文根据某萤石矿的矿物组成,氟均以氟化钙形式存在的特点,探索了另一途径,即以镧-茜素络合腙比色法测定醋酸浸取液中氟含量,以此得出氟化钙校正值的方法,并与蒸馏法测氟进行了矿样对照,结果吻合。方法具有快速、简便的特点。本法测得某矿区萤石精矿氟化钙的校正值均为0.31%。试剂:醋酸-醋酸钠缓冲溶液(pH4.5),称取109克醋酸钠(NaAc·3H_2O)溶于水中,加入619毫升冰醋酸,用水稀至1升,混匀。分析步骤:称取0.4000克试样于100毫升烧杯中,
Fluoride calcium fluoride correction to determine the value, usually using pure fluorite to carry out, but the formalities cumbersome. According to the mineral composition of a fluorite ore, fluoride is characterized by the presence of calcium fluoride, another way is to explore the method of lanthanum-alizarin complex hydrazone colorimetric determination of acetic acid leaching solution of fluorine content, as a Derived calcium fluoride correction value of the method, and with the distillation of fluoride mineral sample control, the results match. The method is fast and easy. This method measured the fluorite concentrate fluorite correction of a mine area are 0.31%. Reagents: acetic acid - sodium acetate buffer solution (pH4.5), weighed 109 grams of sodium acetate (NaAc · 3H_2O) dissolved in water, add 619 ml of glacial acetic acid, dilute to 1 liter with water and mix. Analysis steps: Weigh 0.4000 grams of the sample in a 100 ml beaker,