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Recycling of Solid Zinc Phosphating Process Waste

EPA Contract Number: 68D00023
Title: Recycling of Solid Zinc Phosphating Process Waste
Investigators: Waite, Michael D.
Small Business: Chemical Reclamation Technologies
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: August 1, 1990 through February 1, 1991
Project Amount: $47,110
RFA: Small Business Innovation Research (SBIR) - Phase I (1990)
Research Category: Hazardous Waste/Remediation , SBIR - Hazardous and Solid Waste

Description:

A method for recycling zinc phosphating process waste is proposed. About three million pounds of solid chemical waste is generated annually from zinc phosphating in North America. The waste is an inorganic mixed zinc/iron tertiary salt of phosphoric acid. Toxicity levels vary but most wastes contain nickel, chrome, lead, and other toxins in small quantities. The method depends upon continuous removal of iron as the central mechanism of the recovery process. The waste is converted to an aqueous solution of primary zinc phosphate. By adjusting the concentration of various additives, a product equivalent to the original zinc phosphating feed stock may be created. A method of con- version of the separated iron to feffous oxide is also proposed. Both end products have a proven market The proposed process does not generate waste products of its own.

Supplemental Keywords:

Toxics, Scientific Discipline, Waste, RFA, chemical mixtures, Chemical Engineering, Hazardous Waste, Environmental Engineering, Environmental Chemistry, Chemistry and Materials Science, Hazardous, 33/50, Engineering, heavy metals, industrial waste, metal complexes, chemical waste, chromium & chromium compounds, recycled waste products, extraction of metals, lead, hazardous waste recycling, metal recovery, phosphoric acid, zinc phosphating, lead & lead compounds, hazardous liquid waste, hazardous waste disposal, ferrous oxide, hazardous waste treatment, nickel & nickel compounds, chemical releases

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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