Study On The Removal Technology Of Furnace Accretion In Imperial Smelting Process By Coke Washing Method And Its Application

Imperial Smelting Process(ISP) is a process available for production of Zinc and Lead. Combining with the factors having effects on the ISP, the development of I.S.P technique including energy conservation, valuable element recycling, DCS control and environmental protection is introduced here. The demonstration integrates the design and practice.I.S.P mainly consists of sintering and smelting. In this paper, the effects of temperature variety of zones in furnace on accretion are discussed and Furnace accretion is the main problem leading to high pump sump dross formation and condenser accretion. . Based on the results and the conditions meeting coke washing technology, a coke washing technology is used to remove the accretion.Firstly, the refractory and structure of Imperial Smelting Furnace roof are improved, and a new structural materials produced by MATRICAST3000 in America is used, whose components are given as follow: A12O3-49.80% , SiO2-46.20% , CaO-1.10% , TiO-1.40% , FeO-1.00% , Me-0.30%. Considering coke enrichment in furnace, downtime of materials, wind quantity and pressure, changes of CO/CO2, adding time of returning slag, time of removing slag and time of removing accretion by coke washing method, the related technologies andoperation are agreed on under experimental conditions.Coke washing is used to clear the furnace accretion of No. I and II system in Shaoguan Smelter. The results show that the technology has such advantages as entirely removing accretion, improving furnace operation conditions and production of ISP, reducing damages of furnace body caused by demolishing method, and prolonging the campaign shutdown duration, which greatly reduce maintaining cost.