摘要
为了准确确定碱石棉吸收重量法测定钢中低碳时的空白值,考察了实验使用的瓷舟中碳熔出状况。结果表明,在助熔剂和样品两种不同熔体的作用下,只装有助熔剂与同时装有助熔剂和样品的瓷舟的碳熔出率不同,前者比后者高。由于瓷舟中碳的熔出率不同,测得的空白值也不同。在进行样品分析时,由于瓷舟中有样品和助熔剂,如果用瓷舟只有助熔剂无样品时测得的空白值计算样品中碳的测定结果,会导致结果偏差。因此无论是重量法还是其他的比较分析,都必须要找到样品分析时瓷舟中碳的熔出空白值。在计算试样分析结果时,不能直接扣除瓷舟只有助熔剂无样品时测得的空白值,必须要扣除瓷舟有助熔剂和样品时的空白值,这对于样品中痕量碳的测定尤其重要。
In order to accurately measure the blank value in the determination of low-carbon in steel by caustic asbestos absorption gravimetric method,the fusing carbon of the porcelain boat used in the experiment was investigated.The results showed that under the effect of two different melts,namely,the flux and the sample,the porcelain boat containing only the flux and the porcelaia boat containing both flux and sample showed different fusing ratio of carbon,larger for the former than the latter.Due to different fusing ratios of carbon in the porcelain boats,the measured blank values were also different.During sample analysis,because the porcelain boat contained both the sample and the flux,if the determination result of carbon was calculated with the blank value obtained when the porcelain contained only the flux without the sample,the result would be inaccurate.So,whether it is the gravimetric method or other comparative analysis,the fusing blank of carbon in the porcelain bank during the sample analysis has to be obtained.When the sample analysis results are calculated,the blank value obtained when the porcelain contained only the flux without the sample could not be directly deducted,and it＇s necessary to deduct the blank value when the porcelain boat contained both the flux and the sample,which is of significant importance for the determination of trace carbon in the sample.
出处
《冶金分析》
CAS
CSCD
北大核心
2014年第1期55-58,共4页
Metallurgical Analysis
关键词
低碳
熔出空白
重量法
low-carbon
fusing blank
gravimetric method
