Sustainable Mining and Metallurgy

Salt-bearing wastewater from non-ferrous smelter is characterized by a high salt content, complex composition and easy scaling, etc. With a lack of green, efficient and low-cost treatment technology and device, the conventional treatment technology confronts the problems of high energy consumption, limited processing capacity, high operation cost and easy scaling inside the equipment, etc. LTE technology, with exhaust steam as the heat source, is suitable for high salt, high calciumand high ammonia nitrogen waste water treatment. This paper studied the high-salt wastewater (TDS＞100g/L) from a non-ferrous smelter and built a set of LTE equipment with a treatment capacity of 10m³/d, and the pilot test was done. The pilot test result showed that the single-effect LTE evaporation and concentration equipment boasted a processing capacity of 0.32-0.45m³/h, the evaporation capacity was 0.20-0.31m³/h, water yield was larger than 60% and the conductivity of yielded water was stable and less than 60us/cm. The yielded water with a high quality meet the standard of softened water. LTE technology realizes the high-quality recycling of wastewater, characterized by a low operation cost and anti-scale of heat exchange pipe and other advantages.