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矿物原料中的钙镁分析法,目前一般都采用络合滴定。有的分离出铁铝锰等杂质后进行连续络合滴定钙镁,或分测钙和钙镁合量。有的不分离铁铝等杂质,直接分取几份溶液加掩蔽剂测钙和钙镁合量。但铁矿石中钙镁的含量低,还没有成熟的络合滴定法,合锰大于1%的更属困难了。近来有以三乙醇胺为掩蔽剂,在大量铁存在下直接连续高速分析烧结矿中的钙镁。我们认为钙镁连续测定,不但操作简便迅速,而且容易保证质量,能适应任何比例的钙镁含量。因此进行了用三乙醇胺,氰化钾,过氧化氢等掩蔽铁锰铝等杂质,直接连续测定钙镆的试验。发现仅以三乙醇胺,氰化钾,过氧化氢满足不了掩蔽大量锰的要求,还需加盐酸羟胺等联合掩蔽,才能适应大量锰铁存在下连续测定钙镁。约十几分钟可完成一个样品的分析,准确度较满意,终点明显,是目前应用范围最广的钙镁连续测定方法。
Calcium and magnesium in mineral raw materials analysis, the current general use complexation titration. Some separation of Fe-Mn-Mn and other impurities after continuous complexometric titration of calcium and magnesium, or points to measure the total amount of calcium and magnesium. Some do not separate iron and aluminum and other impurities, direct access to several solutions plus masking agent to measure calcium and calcium together. However, the low content of calcium and magnesium in iron ore, there is no mature complexation titration, manganese is more than 1% more difficult. Recently triethanolamine as masking agent, in the presence of a large number of iron directly for continuous high-speed analysis of calcium and magnesium sinter. We believe that continuous determination of calcium and magnesium, not only easy and quick operation, but also easy to ensure quality, to adapt to any proportion of calcium and magnesium content. Therefore, triethanolamine, potassium cyanide, hydrogen peroxide and other impurities masking ferromanganese directly continuous determination of calcium 镆 test. Found only triethanolamine, potassium cyanide, hydrogen peroxide can not meet the requirements of masking a large amount of manganese, but also need to add hydroxylamine hydrochloride and other joint masking, in order to adapt to a large number of continuous presence of ferromanganese calcium and magnesium. About a dozen minutes to complete a sample analysis, the accuracy is more satisfactory, the end point is obvious, is the most widely used method of continuous determination of calcium and magnesium.