碱分离—硫酸铁铵滴定法测定钛钒合金中钛  

Alkali separation-ammonium ferric sulfate titration methodfor determining titanium in titanium-vanadium alloys

作　　者：黄甫辉 王艳红 Huang Fuhui;Wang Yanhong(Shenyang Non-ferrous Metal Research Institute Co.,Ltd.)

机构地区：[1]沈阳有色金属研究院有限公司

出　　处：《黄金》2023年第7期125-128,共4页Gold

摘　　要：采用硫酸铁铵滴定法测定含钒大于0.60%的钛钒合金试样时,钒严重干扰钛的测定。实验利用盐酸、氢氟酸和硝酸溶解钛钒合金,利用氢氧化钠强碱性溶液使钛生成沉淀与钒、锡等干扰元素分离,沉淀经盐酸溶解、铝片还原,采用硫酸铁铵滴定法测定钛。实验考察了试样分解、干扰元素、沉淀剂用量、沉淀溶解、还原剂及保护装置的选择和滴定前放置时间等对测定结果的影响。本方法测定结果的相对标准偏差为0.12%~0.17%,测定值与给定值相符合,可用于钛钒合金中钛的分析。When the determination of titanium in titanium-vanadium alloy samples with vanadium content more than 0.60%is carried out by ammonium ferric sulfate titration method,vanadium was seriously interfered with the determination of titanium.Therefore,the titanium-vanadium alloy was dissolved by hydrochloric acid,hydrofluoric acid and nitric acid,and the titanium was precipitated into sodium trititanate in sodium hydroxide,which was separated from the interfering elements such as vanadium and tin.The precipitation was dissolved in hydrochloric acid,reduced by adding aluminum flake,and finally,the titanium was determined by ferric ammonium sulfate titration.The influence of sample decomposition,interference elements,dosage of the precipitant,precipitation dissolution,selection of reducing agent,selection of protective device and time before titration on determination was studied.The relative standard deviation of titanium in titanium-vanadium alloy was 0.12%-0.17%with this method,and the determination results are consistent with the given value.The method can be applied to the analysis of titanium in the titanium-vanadium alloy.

关 键 词：碱分离 滴定法 硫酸铁铵 钛钒合金 钛 

分 类 号：O655[理学—分析化学]