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硒元素是工业生产中一种重要的稀有元素,由于硒元素不具有独立的工业矿藏,因此目前硒元素的工业生产,主要依靠从铜电解精炼的阳极泥中提取。因此铜阳极泥中硒含量的测定显得尤为重要,目前工业生产中最为常用的是硫代硫酸钠滴定法,它是通过硫代硫酸钠和含有硒元素的酸反应生成四硫硒酸钠,再通过碘量法滴定硫代硫酸钠,通过测定硫代硫酸钠消耗量来计算阳极泥中硒的含量。由于还原实验的酸性环境和沉淀析出的时长也会对硒含量的测定造成影响,因此本实验还需要确定适宜的盐酸浓度以及沉淀析出的时间长度,并对试样中可能存在的不同元素杂质的干扰情况进行讨论。
Selenium is an important rare element in industrial production. As selenium does not have an independent industrial mineral deposit, the present industrial production of selenium mainly relies on the extraction of anode slime from copper electrolytic refining. Therefore, determination of selenium content in copper anode slime is particularly important, the most commonly used in industrial production is sodium thiosulfate titration, which is through the sodium thiosulfate and selenium containing acid reaction of sodium selenite, and then Titration of sodium thiosulfate by iodometric method, the content of selenium in anode slime was calculated by measuring the consumption of sodium thiosulfate. Since the acidity of the reduction experiment and the precipitation time will affect the determination of selenium content, we also need to determine the appropriate concentration of hydrochloric acid and the length of precipitation precipitation, and the sample may exist in the different elements of impurities Interference situation to discuss.