President, Beijing Allied Rongda Engineering Material Co Ltd, China
Dr. Zhang Rong Hui is the Founder and President of Beijing Allied Rongda Engineering Material Co Ltd and has 5 patents to his name in casting process, blast furnace construction, etc. Hui specializes in nonmetal & inorganic materials and sits on the committee of experts of various leading organization in China including China Metals Society, China Refractory Industry Association among others.
Topic – Monolithic Casting Repair Technology of BF Hearth and BF Trough Longevity Technology.
Abstract: Monolithic casting of BF hearth, which replaces the traditional brickwork, is a real “Cup” structure, providing higher structural strength and anti-scouring resistance. The technology only needs to pump the stirring materials into the mould which is placed in advance, and after the materials are hardened, the mold can be removed. After simple baking, the castable working layer can be put into production. It makes complete use of residual carbon brick, continuous pumping, with construction capacity up to 15t/h, the overall construction time just needs 7 days. Silica sol combination materials, which can be fast drying explosion, providing good integrity, high strength, resistance to slag and iron erosion.
The practice of transforming the main trough of Blast Furnace with simple tap hole into iron store structure with New Anti- Explosive castable refractory. After transformation the service life from 4-7 days is more than 60 days, the labor intensity of the furnace workers is greatly reduced and also leads to lesser pollution. The water cooling system of main iron trough and slag trough will provide great thermal conductivity and will reduce temperature of the material which can reduce molten slag from erosion and abrasion to iron trough and prolong the service life. Rapid hot repair from main iron trough, the shotcreting technology can repair iron using the tapping interval time and can effectively extend the service life of iron trough. Significantly, reducing inevitable 15- 20 hours of repair time.