Abstract
The investigations made it possible to establish the composition of the crust and the influence on its formation of certain service factors. In operation of MDN-6A feeders encrustation of the channels has a local character. The crust is formed in one of the side vertical portions of the channel. Failure of the crucible lining, contamination of the metal with coarse nonmetallic particles, and the occurrence of local overheating in the channel influence the operating life of the channel and the feeder in general. The rate of crust formation is determined by the quality of the lining fluorophlogopite material. The presence of cracks, shrinkage porosity, and an increased quantity of free glassy substance causes acceleration of failure of the channel lining.
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