Recovery,Reuse,and Reduction of Zinc Metal Waste in Zinc Rich Inorganic Primers.

摘要

Progress on task objectives is reported as follows: (1) An electrostatic spray gun and process for spraying zinc rich primers was developed and demonstrated; (2) The parameters for reprocessing waste zinc for reuse in zinc rich primer were established by experiments; (3) The ability of the agricultural chemical industries to utilize waste zinc rich primers was established and two national models were initiated; (4) Experiments have proven that in the case of automatic zinc rich primer lines,spraying of shop primer to a 1mil nominal thickness using S280shot,in lieu of past conventional S330shot,produces zinc savings; (5) Mid-task results indicate that Ferrophos (TM),an iron-phosphor by-product of the sodium industry,can be successfully utilized as diluent for zinc rich primers at concentrations defined in this project; (6) Initial work indicates that in the long term,zinc should be recovered from scrap iron both for recovery of zinc,and to make more scrap iron available; (7) Optimum zinc and zinc rich primer tests have been developed or identified;and (8) It has been estimated that if the waste recovery techniques developed are implemented,the domestic zinc recycle level could be approximately doubled.