Omkonstruktion av mekaniskt arm och varmhållningslock till konverterugn : Konverterhallen, Boliden Rönnskär

Sammanfattning: When the copper production takes place, the pure rock smelting undergoes a sub-processcalled copper conversion. This process is a batch process, which means that the converterfurnace cools down before the next refill. Inside the converter ovens there is a masonrywear brick that is adversely affected when exposed to temperature variations. When thewearing brick cools down, a contraction occurs in the material, then when heated, anexpansion of the material occurs instead. The result of this is that tensions arise in thematerial, which increases the risk of cracking. To possibly make it possible to maintain amore even temperature in the converter furnace, this thesis will focus on developing a basisfor a construction of a heat-keeping lid for the mouth of the converter furnace. With a heatretention cap in place, it could possibly be possible to maintain a more even temperature,which could result in a longer lifespan of the masonry wear brick. If a warming cover were tobe placed on the mouth, it could also mean a reduced combustion of diesel oil via thewarming burners that are placed inside the converter furnace, which could also reduce theenergy requirement. In addition to the heat-keeping lid, a construction that will enable amovement of the heat-keeping lid to and from the mouth of the converter furnace will alsobe investigated. The design produced will be in a very harsh environment where corrosion isknown to be a concern, and therefore this is considered when choosing the material used inmanufacture. According to the results presented in the report, the heat-keeping burnersinside the converter oven should need to be used approx. 64% less than if the heat-keepinglid were not placed.