Abstract: The fuzzy comprehensive evaluation indexes, evaluation system and mathematical model for the greenness of the process for treating high titanium slags were established, involving resource consumption, environmental impact, cost, time and quality.The fuzzy comprehensive evaluation of the greenness of the process for treating high titanium slags by microwave irradiation was made through test examples and it was compared with the greenness of the conventional method.The result shows that the greenness of the microwave method is far better than that of conventional method and the microwave processing method meets with the development trend of green manufacture

Key words: High titanium slags, Microwave processing, Greenness, Fuzzy comprehensive assessment