板栗苞单宁提取物用于锗离子络合剂的研究

摘要

Germanium was widely used in the semiconductor materials, metal materials, infrared optics, optical communications, bjomedicals, etc. In this study chestnut shell tannin extract that was prepared from usually abandoned chestnut shell as raw material, was used as a complexing precipitant of geranium ion. The effects of reaction time, reaction temperature, the amount of chestnut shell tannin extract, pH value,ZnSO4 concentration during complexing precipitation were tested respectively. According to single factor and orthogonal experiment results,the optium experimental conditions were as follows:pH value 2.5, the amount of tannin extract to ( 36 times of germanium) , ZnSO4 content of 110 g/L. Under these conditions,the recovery of germanium was up to 99.0%.%锗在半导体材料、金属材料、红外光学、光纤通讯及生物医药等领域有着广泛的应用.采用通常废弃的板栗苞为原料制备的板栗苞单宁提取物为络合剂,用于提取稀有金属锗的研究.分别考察了反应时间、反应温度、板栗苞单宁提取物用量、pH值、ZnSO4质量浓度等单因素对板栗苞单宁用于络合锗的影响,并通过正交试验得出最佳工艺条件:pH值2.5,单宁提取物用量为锗离子质量的36倍,ZnSO4质量浓度110 g/L.在此条件下25℃反应30 min沉锗率可达99.0％.