High-standard sealed paste nickel pig iron smelting process:
1. The laterite ore arriving at the factory is directly mixed and pressed into balls after natural drying and dehydration. The wet ball formation rate is higher than 85%, and the water content is 15-18% directly into the rotary kiln without drying.
2. The total reduction time of the pellets in the furnace is 3-4 hours, the highest temperature in the furnace is 1150, the nickel is nearly completely reduced, and the iron is reduced by about 60%. The pellets are basically sintered and there is a certain amount of residual carbon.
3. The hot pellets discharged from the rotary kiln are sealed and insulated, and then charged into a 12,500 semi-closed electrode paste submerged arc furnace at 600 degrees Celsius. The coal is substituted for coke. The smelting power consumption of crude nickel pig iron is 3974Kwh/ton, and the nickel recovery rate is 3974Kwh/ton. 95%. Of course, this is also related to the use of high-standard sealed electrode paste.
4. The crude nickel pig iron in the submerged arc furnace is deeply smelted by 6 tons of AOD converter to produce the fine ferronickel with the quality of ferronickel that meets the national standards. Achieved a technical upgrade of product quality.