The rotary hearth furnace developed independently by CISDI operates with a coal-based direct reduction process by reducing the thermo-set Fe-containing sludge in the rotary hearth furnace where zinc, lead, potassium, sodium, chlorine and other impurities are removed while metallized DRI pellets and coarse zinc powder are produced, and the waste heat is recovered as well. This technology is suitable to treat the metallurgical zinc-containing sludge, solve the problem of zinc and alkali metal enrichment during the smelting process at the iron & steel works. It can help realize comprehensive utilization of iron, carbon and zinc, and serve enrichment of lean ores such as vanadium-titanium ore, laterite nickel ore and reclamation of non-ferrous slag such as copper slag and red mud.
Rotary Hearth Furnace Treatment Line of Yanshan Iron & Steel, China
Materials treated: Zn-containing dust generated in the iron & steel works;
Treating capacity: 200,000t/a;
Products: As raw materials for converters, blast furnaces;
Start-up: 2015.
Rotary Hearth Furnace Treatment Line of Baosteel Zhanjiang, China
Materials treated: Zn-containing dust generated in the iron & steel works;
Treating capacity: 200,000t/a;
Products: As raw materials for converters, blast furnaces;
Start-up: 2016.
| Project/Client | Designed Capacity | Start-up |
| 2x200,000t/a rotary hearth furnaces (Phase I) of Yanshan Iron & Steel, China | 200,000t/a | 2015 |
| 2x200,000 t/a rotary hearth furnaces (overhaul) of Rizhao Steel, China | 2x200,000t/a | 2015 |
| Rotary Hearth Furnace for the Solid Waste Centre (Phase I) of Baosteel Zhanjiang, China | 200,000t/a | 2016 |
| 2x300,000t/a rotary hearth furnaces for the Plate Mill of Minmetals Yingkou, China | 2x300,000t/a | Suspended |
| 2x200,000t/a rotary hearth furnaces (Phase II) of Yanshan Iron & Steel, China | 200,000t/a | 2018 |