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炉渣中Cr_2O_3的分析方法较多.一般有容量法和比色法。测定时,在分解试样后一般用高氯酸冒烟或高锰酸钾将铬氧化成高价,也有用硝酸银作催化剂,以过硫酸铵氧化铬至高价。但用高氯酸氧化使结果稍偏低,而用高锰酸钾或过硫酸铵氧化则需用铬标准溶液与试样同时作平行分析,使操作繁琐。本法对此作了改进。对于酸不溶性炉渣试样,则分取经硼酸-碳酸钠熔融后的盐酸介质溶液,用硝酸驱除Cl~-后再用酸溶性炉渣的分析步骤即可。试验结果表明,方法准确可靠。简便易行,并可节省时间和试剂主要试剂与仪器混合熔剂两份无水碳酸钠和1份硼酸充分研细混匀。
Cr_2O_3 analysis of slag more methods are generally volumetric method and colorimetric method. Determination, the decomposition of the sample after the general use of perchloric acid smoke or potassium permanganate oxidation of chromium into high prices, but also useful silver nitrate as a catalyst, ammonium persulfate to high prices of chromium oxide. However, the perchloric acid oxidation results slightly lower, but with potassium permanganate or ammonium persulfate is required to use chromium standard solution for parallel analysis of the sample at the same time, the operation cumbersome. This law has been improved. For the acid-insoluble slag sample, the hydrochloric acid solution after the boric acid-sodium carbonate melted is subdivided, and the acid-soluble slag can be analyzed after removing Cl ~ - with nitric acid. The experimental results show that the method is accurate and reliable. Easy to use and saves time and reagents Main reagents and equipment Mixed flux Two parts of anhydrous sodium carbonate and one part of boric acid Research and mix thoroughly.