铬矿中什质的测定必须要将主元素鉻进行分离。分离铬的方法很多,其中以离子交换法比较优越,离子交换分离可采用动态法[1](柱交换)和静态法[2](树脂加到溶液中进行交换)。动态分离需要装置交换柱,每次分离要对树脂进行再生,此较麻烦,静态法对鉻进行分离是适宜的。资料[2]将斌样碱熔后的酸浸之液直接加树脂进行交换,我们发现酸浸出液中存在着相当数量三价鉻离子,如不将其氧化成六价,对后面的测定有干扰,(三价鉻和EDTA形成深紫色鉻合物),因此,对酸浸出液进行氧化处理是有必要的。我们用P标准法[3]分析三氧化二铝时,发现结果总是不够稳定,经证实原因是我区鉻铁矿含铝和镁较高,规程中规定的氟化鉀用量偏低,尤其采用快速法测定不分离鈣镁时,必须适当增加氟化鉀用最,否则结 Chromium ore quality determination must be the main element of chromium separation. There are many ways to separate chromium, of which ion exchange method is superior, ion exchange separation can be used dynamic method [1] (column exchange) and static method [2] (resin added to the solution for exchange). Dynamic separation requires the exchange column equipment, each separation of the resin to be regenerated, this is more troublesome, static separation of chromium is appropriate. The data [2] will be bin-like alkali melt acid leaching solution directly plus resin exchange, we found that there is a significant amount of acid leaching solution of trivalent chromium ions, such as not be oxidized to six hexavalent, the determination of interference (Trivalent chromium and EDTA form dark purple chrome compounds). Therefore, it is necessary to oxidize the acid leachate. When we analyze aluminum oxide by P standard method [3], we find that the result is not always stable enough. The reason for this is that aluminum and magnesium in our chromite are high, and the amount of potassium fluoride prescribed in the regulations is low, especially Rapid determination of non-separation of calcium and magnesium, potassium fluoride must be the appropriate increase in the most, or knot