Environ Technol. 2014 May-Jun;35(9-12):1208-18. doi: 10.1080/09593330.2013.865062.
The present study is concerned with the removal of copper powder from aqueous solution by cementation on a stationary disc placed inside an agitated vessel. The influence of several parameters on the rate of cementation, such as initial copper sulphate concentration, impeller rotational speed, presence of surfactant (Triton X-100), distance between the disc and the impeller, type of blade turbine and presence of baffles, has been investigated. The rate of cementation was found to increase with increasing impeller rotational speed and initial copper sulphate concentration. On the other hand, the rate decreases with increasing distance between the disc and the impeller. The rate of cementation was inhibited in solutions containing Triton X-100. Performance of a four-blade 90 degree turbine with regard to the rate of copper cementation was superior to the performance of a four-blade 45 degree pitched turbine. The present data can be correlated in terms of mass transfer coefficient of cementation as Sh = 0.905 Sc0.33 Re0.89 (d/l)0.41 (four-blade 90 degree turbine); Sh = 0.815 Sc0.33Re0.79 (d/l)0.47 (four-blade 45 degree pitched turbine), for the conditions 2035 < Sc < 2810 and 35,000 < Re < 179,000.
本研究关注的是在搅拌容器内放置的固定圆盘上通过浸淀从水溶液中去除铜粉。研究了几个参数对浸淀速率的影响，如初始硫酸铜浓度、搅拌器转速、表面活性剂（Triton X-100）的存在、圆盘与搅拌器之间的距离、叶片涡轮的类型和挡板的存在。研究发现，浸淀速率随着搅拌器转速和初始硫酸铜浓度的增加而增加。另一方面，随着圆盘与搅拌器之间的距离增加，浸淀速率会降低。在含有 Triton X-100 的溶液中，浸淀速率受到抑制。关于铜浸淀速率，四叶片 90 度涡轮的性能优于四叶片 45 度斜叶涡轮。根据浸淀传质系数，可以关联本研究数据，结果表明：在 2035<Sc<2810 和 35,000<Re<179,000 的条件下，四叶片 90 度涡轮的 Sh 值为 0.905 Sc0.33 Re0.89 (d/l)0.41；四叶片 45 度斜叶涡轮的 Sh 值为 0.815 Sc0.33 Re0.79 (d/l)0.47。
