复杂钴物料中钴的滴定分析  

Volumetric Analysis of Cobalt in Complex Cobalt Materials

作　　者：袁威[1] 刘维理[1] 

机构地区：[1]昆明冶金研究院,云南昆明650031

出　　处：《岩矿测试》2003年第3期235-236,共2页Rock and Mineral Analysis

摘　　要：实验表明,钴试样经HCl分解后,在pH1～2时,通过硫氰酸铵-结晶紫-H2O浮选将Co2+与Ni2+、Mn2+、Fe3+、Al(Ⅲ)等元素分离,硫脲掩蔽Cu2+以消除干扰,用EDTA溶液络合滴定Co。方法用于钴试样中Co的分析,结果与铈量法相符,对于w(Co)为3%～35%的试样,4次测定的相对标准偏差<2%。A volumetric method for determination of cobalt in complex cobalt materials was developed. Sample was decomposed with HCl and Co2+ was separated from Ni2+, Mn2+ Fe3+ and Al (Ⅲ) by floatation with NH4SCNCVH2O at pH 1～2. The interference from Cu was eliminated with thiourea as a masking reagent and Co was determined by complexometric titration with EDTA. The method has been applied to the determination of cobalt in complex cobalt materials. The results are in agreement with those provided by cerimetric titration. The precision for the samples with w(Co)=3%～35% are <2% RSD (n=4).

关 键 词：钴物料 钴 滴定分析 铈量法 络合滴定 

分 类 号：O614.812[理学—无机化学] O655.2[理学—化学]