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RECYCLING ZINC IN VISCOSE RAYON PLANTS BY TWO STAGE PRECIPITATION
RECYCLING ZINC IN VISCOSE RAYON PLANTS BY TWO STAGE PRECIPITATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/625/2-73/001a (NTIS PB259136).
In an EPA demonstration grant, a process for precipitating a dense sludge of high zinc assay was proven. The zinc in the sludge was recovered and recycled to the rayon manufacturing plant. This recycling of zinc was shown to have no ill effects on rayon yarn. This process greatly enhances the economics of removing this source of zinc pollution, allowing neutralization of the acid stream and recovery of the zinc of a good profit for industrial yarns and at a moderate cost for textile yarns.