含铬物料中铅量的测定方法研究  

Study of Test Method of Lead Content in the Materials Containing Chromium

作　　者：张德录 夏兵伟 陈海燕[2] 庞文林[3] 

机构地区：[1]河南有色地质勘察局,河南安阳455004 [2]水口山有色金属集团有限公司,湖南衡阳421513 [3]湖南有色金属研究院,湖南长沙410015

出　　处：《湖南有色金属》2012年第6期68-70,共3页Hunan Nonferrous Metals

摘　　要：鼓风炉铬镁砖渣中采用GB/T8152.1-2006铅量的分析方法,铬与硫酸反应生成Cr2-(SO4)3沉淀进入待测溶液,其颜色影响无法判断终点,引起分析结果不准确。采用预先加入NaOH与H2O2与铬离子生成CrO24-,在过滤PbSO4时将其分离的方法,从而消除铬的干扰;并对此方法进行了条件试验、精密度和回收率试验,证明此方法准确可靠。GB/T8152.1 - 2006 is a standard method for chemical analysis of lead content. However, this method is not valid when it was used to determine the lead content in the residue of magnesia chrome bricks in the blast fur- nace, because Cr203 would react with sulfuric acid to form Cr2（SO4）3 interfusing with the PbSO4 precipitate. Then Cr3 ＋ entered into the sample solution so that its color interfered the end point of titration and accordingly resulted in the inaccuracy of the analysis. This paper presents a method, adding NaOH and H202 in advance to oxidate Cr^3＋ to CrO^2-4 and then separating CrO^2-4 from PbSO4 as it was filtered, to eliminate the interference of chromi- um. And a series of conditional, accuracy and recovery rate experiments were conducted to prove the reliability of this method.

关 键 词：铬镁砖渣 铬 铅量的测定 GB T8152 1—2006 

分 类 号：O614.433[理学—无机化学]