The possibility of the recovery of hydrochloric acid from rare earth （RE） chloride solutions was first experimentally studied by batch vacuum membrane distillation （VMD）. The recovery by continuous VMD was also st...The possibility of the recovery of hydrochloric acid from rare earth （RE） chloride solutions was first experimentally studied by batch vacuum membrane distillation （VMD）. The recovery by continuous VMD was also studied to devise methods that enabled the operation of VMD setup in a stable condition as well as to increase the membrane-operating life The results indicated that HCl separation with RE by VMD was possible, and the recovery ratio of 80% could be achieved by batch VMD. In continuous VMD, when the temperature of circular solutions, circular rate, and downstream pressure was 62-63℃, 5.4 cm/s, and 9.33 kPa, respectively, the HCl concentration in circular solutions and the processing capacity per membrane area were obtained. The mathematical results were in accordance with the experimental ones.展开更多
The hydrochloric acid recovery from rare earth chloride solutions by continuous vacuum membrane distillation was first experimentally studied, then material balance of the process was calculated, and the equations whi...The hydrochloric acid recovery from rare earth chloride solutions by continuous vacuum membrane distillation was first experimentally studied, then material balance of the process was calculated, and the equations which mathematically stimulate the process were lastly achieved. The results indicate a given RE concentration in circular solutions means its constant HCl concentration during the continuous VMD process, furthermore, increasing RE concentration in feed solutions increases the processing capacity per membrane of the experimental set-up. When keeping constant RE concentration in feed solutions, increasing RE concentration in circular solutions decreases its HCl concentration, and HCl recovery ratio increases accordingly, however, processing capacity per membrane of the experimental set-up decreases at the same time. The mathematical results are in accordance with experimental results.展开更多
文摘The possibility of the recovery of hydrochloric acid from rare earth （RE） chloride solutions was first experimentally studied by batch vacuum membrane distillation （VMD）. The recovery by continuous VMD was also studied to devise methods that enabled the operation of VMD setup in a stable condition as well as to increase the membrane-operating life The results indicated that HCl separation with RE by VMD was possible, and the recovery ratio of 80% could be achieved by batch VMD. In continuous VMD, when the temperature of circular solutions, circular rate, and downstream pressure was 62-63℃, 5.4 cm/s, and 9.33 kPa, respectively, the HCl concentration in circular solutions and the processing capacity per membrane area were obtained. The mathematical results were in accordance with the experimental ones.
文摘The hydrochloric acid recovery from rare earth chloride solutions by continuous vacuum membrane distillation was first experimentally studied, then material balance of the process was calculated, and the equations which mathematically stimulate the process were lastly achieved. The results indicate a given RE concentration in circular solutions means its constant HCl concentration during the continuous VMD process, furthermore, increasing RE concentration in feed solutions increases the processing capacity per membrane of the experimental set-up. When keeping constant RE concentration in feed solutions, increasing RE concentration in circular solutions decreases its HCl concentration, and HCl recovery ratio increases accordingly, however, processing capacity per membrane of the experimental set-up decreases at the same time. The mathematical results are in accordance with experimental results.
