无机陶瓷膜微滤分离凹凸棒土悬浆液

以凹凸棒土悬浆液为研究对象,考察多通道无机陶瓷膜对黏土类矿物的微滤分离过程。系统地考察了无机膜孔径、操作压力、操作温度、错流速度、悬浆液质量浓度及溶液pH值等参数对微滤过程的影响。研究结果表明:微滤渗透通量随操作压力、操作温度、错流速度及悬浆液质量浓度的增加而增大,且随着溶液pH值的变化通量存在最大值。确定了适宜操作条件为:膜孔径0.8μm,操作压力0.10—0.15 MPa,操作温度298—303 K,膜面流速1.0 m/s,悬浆液质量浓度1.0 g/L,pH值2。通过对膜阻力的分析,确定了微滤分离过程中膜污染阻力大小顺序依次为Rm>Rb>Rc。研究结果为凹凸棒土悬浆液的分离与回收提供了有效的基础数据。

Microfiltration separating of attapulgite clay suspension by inorganic ceramic membrane

The microfiltration separation process of attapulgite clay suspension was studied with multi-channel inorganic ceramic membrane.The effects of the pore-diameter of membrane,cross-flow velocity,operating pressure,operating temperature,mass concentration and pH value of the suspension on the permeate flux were investigated respectively.The results show that the permeate flux of the microfiltration process enhances with the increase of cross-flow velocity,operating pressure,operating temperature and mass concentration of the suspension,and the permeate flux increases to the maximum value with the pH value increasing.The optimum parameters obtained include membrane pore-diameter 0.8 μm,operating pressure 0.10-0.15 MPa,operating temperature 298-303 K,cross-flow velocity 1.0 m/s,mass concentration of the suspension 1.0 g/L and pH 2.According to the analysis of membrane contamination and resistance,the order of the contamination resistance to the micro-filtration is Rm>Rb>Rc.The conclusion contributes to the separation and recovery of the attapulgite clay suspension.