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铬铁矿是难熔矿物。样品用过氧化钠-氢氧化钠混合熔剂分解,热水浸取,以饿酸钠催化破坏过氧化氢,经盐酸酸化后,铬以六价状态存在。我们从试验中找到了在不分离铬(Ⅳ)的条件下,连续铬合滴定铁铝的条件。所拟定方法可用于铬铁矿及铬尖晶石单矿物中铁铝的测定,终点清晰,结果准确,方法快速。分析方法:称取0.5000克样品,在铂坩埚中与4克过氧化钠混匀,再加4克氢氧化钠。在高温炉内于520—540℃熔融30分钟,间或摇动一
Chromite is a refractory mineral. Samples with sodium peroxide - sodium hydroxide mixed flux decomposition, hot water leaching, sodium hydrogen peroxide catalysis destruction of hydrogen peroxide, acidified by hydrochloric acid, the chromium exists in a hexavalent state. We found from the test without separation of chromium (Ⅳ) under the conditions of continuous chromate titration aluminum iron conditions. The proposed method can be used for the determination of iron and aluminum in chromite and chrome spinel single mineral, the endpoint is clear, the result is accurate and the method is rapid. Analysis: Weigh 0.5000 grams of sample, mix with 4 grams of sodium peroxide in a platinum crucible, plus 4 grams of sodium hydroxide. Melt in a hot oven at 520-540 ° C for 30 minutes with or without shaking