State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization 617000;
School of Metallurgy University 110819;
Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education University 110819;
Liaoning Key Laboratory for Metallurgical Sensor and Technology 110819;
vanadium slag; calcification roasting; element distribution; phase composition; leaching rate;