Nippon Steel Corporation started the operation of a dust recycling plant based on technologies of the rotary hearth furnace. The Kimitsu plant has a large 180,000 ton-per-year capacity. New technologies of pellet making, zinc recovery, iron oxide reduction, DRI pellet sintering, etc. are developed and adopted. The dust and sludge are reduced and transformed in almost zinc-free DRI pellets that are strong enough for the BF charge. This plant has solved the problem of the increase in zinc load of the BF when charging dust and sludge.
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Ibaraki et al. (2002) studied this question.
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