新型混合澄清槽的澄清性能

混合澄清槽是稀土生产过程中应用最广泛的萃取设备，其单级的澄清室与混合室体积比多在25∶1以上，造成生产过程中占地面积大、稀土存槽量大、夹带损失高等不利影响.为解决此问题，设计了一种新型混合澄清槽，在澄清室增加搅拌圆筒，创新性采用紫外可见光分光光度法考察不同条件下的水相夹带量以衡量其澄清性能，并与实际生产线测定结果对比.结果表明:适当的搅拌转速、离底高度和环盖尺寸等条件均有利于两相分离.环盖直径30mm、离底高度13cm及搅拌转速低于300r/min时，所测水相夹带量均小于实际生产线夹带量的050%，满足实际生产要求.

Settling Performance of New Type Mixer Settler

Mixer settler separator is the most widely used extraction equipment in rare earth production process. The volume ratio between single stage settler and mixer in China’s rare earth industry is generally above 25∶1， which leads to a large floor area， high rare earth accumulation and high entrainment losses. To solve the problem， a new type of mixer settler was designed， and a mixing cylinder was installed in the settler. The aqueous phase entrainment at the settler outlet was studied by ultraviolet visible spectrophotometry and was compared with the case of industrial production process. The experimental results showed that appropriate conditions are conducive to the two phase separation after reducing the settler volume. When the diameter of the ring cover is 30mm， impeller clearance over the tank bottom is 13cm and mixing speed is within 300r/min， the measured aqueous phase entrainment is less than the industrial result of 050%. This proves that the new type mixer settler can meet the demand of industrial production.