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Separation of ammonia from the ammonia stripping liquor of resin loaded with molybdenum by membrane technology

Authors： HU Lei，XIAO Liansheng，ZHANG Guiqing

Units： School of Metallurgical Science and Engineering，Central South University

KeyWords： molybdenum；tungsten；ammonia；nanofiltration membrane；reverse osmosis membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2012,32(2):87-91

Abstract：

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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AuthorIntro：

胡磊(1988-)，女，湖南醴陵人，硕士，从事冶金分离科学与工程方面的研究．*通讯联系人〈xls1211@sina.com〉

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