I would like to ask everyone about the methods for shutting down a furnace?
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Water spraying is used for cooling during the shutdown process, but scarring tends to occur. I wonder what methods everyone uses? Thank you!
I’m not sure if what the original poster is referring to is an acidized roasting furnace. Our factory uses sulfurization roasting furnaces, and the method employed for shutting down these furnaces is natural cooling; this is achieved by reducing the grade of precious metals as well as the amount of ore fed in, while also using fans to blow air to facilitate cooling.
Different shutdown methods are required for various roasting raw materials (pyrite, lead-bearing pyrite, zinc concentrate, copper sulfide ores)!
This post was last edited and replied to by HCHYHA1319 on 2010-5-24 at 21:33. Reply to 3# yzy496210: The raw material is pyrrhotite or magnetite; magnetic roasting is used. After stopping the feed, the temperature in the furnace keeps rising, and sometimes even adding water doesn’t help to control the temperature. Natural cooling isn’t feasible. I think it’s caused by excessive roasting intensity and large particle sizes – am I correct?
Regardless of the feedstock used, the temperature must be reduced before shutting down the furnace; the extent of this temperature reduction varies however (for pyrite, feeding is stopped first, and at temperatures below 980°C, no reduction in temperature or only a slight reduction is needed before shutting down the fans)； For pyrrhotite, it is necessary to allow the material inside the furnace to burn completely before turning off the fans; an increase in furnace temperature occurs after the supply of material is stopped. Even if, under dynamic conditions, the furnace temperature reaches the melting point of the material, there is no need to worry, as the dynamic melting point is higher than the static one ； Of course, measures to reduce temperatures still need to be taken to prevent a sharp rise.
Reply to 5# yzy496210: The temperature rises rapidly after the material supply is stopped. If no water is added to cool it down, the temperature can exceed 1200 degrees. However, adding water will cause the temperature in the purification section to rise as well, and it may also lead to malfunctions in the boiling furnace. What other good ways are there if no water is to be used?
Reply to 6# HCHYHA1319: It’s fine to add water in a short period of time, even if this results in a higher purification temperature; considering the use of slag at room temperature is also an option.