纳滤膜的污染因其与处理工艺、预处理效果以及所处理水质的不同，会产生各种各样的污染。本文结合某炼化公司在用的纳滤膜系统，对纳滤膜的常见污染问题进行了阐述，并从系统预处理、运行参数控制、化学清洗等方面，总结了该系统的运行与管理经验。

A membrane technology was used to separate ammonia from the ammonia stripping liquor of resin loaded with molybdenum in the process of tungsten hydrometallurgy. Compared with the separating effect of molybdenum-tungsten over ammonia of various nanofiltration membranes and reverse osmosis membranes，a low-pressure RO membrane was considered in our experiments. The effects of different variables on the parameters of permeation flux，molybdenum and tungsten retention rate，ammonia recovery rate(or transparence rate)，the separation coefficient of Mo and WO3 over ammonia were studied including feed liquor concentration，operation pressure，concentration ratio and temperature. And the optimum technical conditions were obtained: operation pressure 2.41MPa, temperature 36℃ with concentration factor 4:1. Under these conditions, the permeation flux reached 27 L/(m2•h) with nearly 100% retention rate of Mo and WO3, the recovery rate of ammonia reached 76% and the separation coefficient of Mo and WO3 over NH3 were 18 and 51，respectively. The successful application of this process in industry has delivered good economical benefits.

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