【摘要】：吸取10mL赤泥酸浸液于燒杯中,用氨水溶液調(diào)節(jié)溶液pH值為3.0~3.5并攪拌20min,經(jīng)固液分離去除沉淀物,將濾液倒入500mL錐形瓶中,再用鹽酸和氨水調(diào)節(jié)溶液pH值為1.6~6.0,加入5滴二甲酚橙指示劑,用二乙基三胺五乙酸(DTPA)標準溶液滴定至由酒紅色變?yōu)榱咙S色即為滴定終點。據(jù)此,建立了DTPA滴定法測定赤泥酸浸液中三氧化二鈧的方法�？疾炝说味╬H值、三氧化二鈧質(zhì)量濃度、滴定溫度、放置時間對測定結(jié)果的影響。結(jié)果表明:三氧化二鈧質(zhì)量濃度的檢測范圍為20~500mg/L,合適的滴定pH值范圍為1.6~6.0,滴定溫度為20~60℃;滴定前將溶液放置20min對測定無影響。共存元素干擾試驗表明,將樣品預先用氨水攪拌沉淀分離后再測定,可消除樣品中鐵和鋁對測定的干擾;樣品中其他共存元素不干擾測定。采用實驗方法測定赤泥酸浸液中三氧化二鈧的結(jié)果與電感耦合等離子體原子發(fā)射光譜法測得結(jié)果基本一致,相對標準偏差RSD(n=5)小于0.2%。
[Abstract]:The 10mL red mud acid extract was absorbed in the beaker. The pH value of the solution was adjusted to 3.0 ~ 3.5 with ammonia solution and stirred for 20 minutes. The precipitate was removed by solid-liquid separation, and the filtrate was poured into the 500mL conical bottle. Then the pH value of the solution was adjusted by hydrochloric acid and ammonia water to 1.6? 0, adding 5 drops of xylenol orange indicator, titrating with diethyltriamine pentaacetic acid (DTPA) standard solution to change from wine red to bright yellow is the titration end point. A DTPA titration method for the determination of scandium trioxide in red mud acid leachate was established. The effects of titration pH value, mass concentration of scandium trioxide, titration temperature and storage time on the determination results were investigated. The results show that the detection range of scandium trioxide concentration is 20 ~ 500mg / L, the suitable titration pH value range is 1.6 ~ 6.0 and the titration temperature is 20 ~ 60 鈩，

本文編號：2286906