Micro-amount terephthalic acid and 4-carboxybenzaldehyde in p-toluic acids were determined by a reversed-phase ion suppression chromatography.The separation was carried out on a C18column（4.6mm i.d.×150mm）with ...Micro-amount terephthalic acid and 4-carboxybenzaldehyde in p-toluic acids were determined by a reversed-phase ion suppression chromatography.The separation was carried out on a C18column（4.6mm i.d.×150mm）with methanol-water（70∶30）as the mobile phase at a flow rate of 0.8ml/min and with H3PO4 as an inhibitor.The detection wavelength was 240 nm.The relative standard deviation of terephthalic acid and 4-carboxybenzaldehyde are less than 3% and 2%,respectively.The average recoveries were 102.9% and 103.2%,respectively.The detection limit were 0.25 ng and 0.45 ng,respectively.展开更多
研究了用二甲苯浸出-焙烧-硫酸浸出杂质-氰化浸出银工艺从湿法炼锌渣中回收硫和银。试验结果表明：在反应温度95℃、反应时间15 min、液固体积质量比5∶1条件下用二甲苯浸出，硫浸出率为96．40％；分硫渣中加入1％氢氧化钠，在630℃下焙...研究了用二甲苯浸出-焙烧-硫酸浸出杂质-氰化浸出银工艺从湿法炼锌渣中回收硫和银。试验结果表明：在反应温度95℃、反应时间15 min、液固体积质量比5∶1条件下用二甲苯浸出，硫浸出率为96．40％；分硫渣中加入1％氢氧化钠，在630℃下焙烧2 h ，然后用硫酸浸出锌、铁等杂质，控制液固体积质量比为4∶1，pH为1．0，反应温度为95℃，反应时间为3h；之后对硫酸浸出渣氰化浸出银，体系pH控制在9．5～11．5之间，液固体积质量比为3∶1，氰化钠质量浓度2．0g/L，浸出时间24h，银回收率为78．5％。展开更多
文摘Micro-amount terephthalic acid and 4-carboxybenzaldehyde in p-toluic acids were determined by a reversed-phase ion suppression chromatography.The separation was carried out on a C18column（4.6mm i.d.×150mm）with methanol-water（70∶30）as the mobile phase at a flow rate of 0.8ml/min and with H3PO4 as an inhibitor.The detection wavelength was 240 nm.The relative standard deviation of terephthalic acid and 4-carboxybenzaldehyde are less than 3% and 2%,respectively.The average recoveries were 102.9% and 103.2%,respectively.The detection limit were 0.25 ng and 0.45 ng,respectively.
文摘研究了用二甲苯浸出-焙烧-硫酸浸出杂质-氰化浸出银工艺从湿法炼锌渣中回收硫和银。试验结果表明：在反应温度95℃、反应时间15 min、液固体积质量比5∶1条件下用二甲苯浸出，硫浸出率为96．40％；分硫渣中加入1％氢氧化钠，在630℃下焙烧2 h ，然后用硫酸浸出锌、铁等杂质，控制液固体积质量比为4∶1，pH为1．0，反应温度为95℃，反应时间为3h；之后对硫酸浸出渣氰化浸出银，体系pH控制在9．5～11．5之间，液固体积质量比为3∶1，氰化钠质量浓度2．0g/L，浸出时间24h，银回收率为78．5％。
