Abstract
Abstract The transport capacity of long-distance slurry pumping systems is directly related to the roughness of the pipe. In this context, corrosion plays an important role, especially when dealing with old pipes. Chemical, mineralogical and microstructural analyses were performed on materials removed from the internal surface of an iron ore slurry pipeline in order to access their composition and to check if they were a result of internal pipeline corrosion. This pipeline has been operating since 1977. It was found that the tubercles formed on the internal wall of the pipe presented botryoidal magnetite as their essential composition. As the amount of magnetite is very low in the transported slurry and magnetite with botryoidal morphology is not present in the processed iron ore, it was concluded that this magnetite is a result of a corrosion process occurring on the internal wall of the pipeline.
Highlights
The transport of iron ore slurry through pipelines has several advantages over other modes of transport on long distances, such as lower rate of accidents during operation, lower power consumption, higher reliability, savings in transport ness of the pipe
The essential and original structure of the tubercles does not contain significant amounts of calcium which would not be associated with their formation
The tubercles removed from the pipeline are composed mainly by botryoidal magnetite
Summary
The transport of iron ore slurry through pipelines has several advantages over other modes of transport on long distances, such as lower rate of accidents during operation, lower power consumption, higher reliability, savings in transport ness of the pipe. In this context, corrosion costs and relatively low environmental plays an important role, especially when impact (Sampaio; Brandão, 2004). Dealing with old pipes such as the studied. The transport capacity of slurry pipeline which has been in operation since pipelines is directly related to the rough- 1977, transporting iron ore slurry from
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