Process for fixing lead-contaminated ecologically hazardous industrial waste materials using clinoptilolite zeolite
US5234498A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Sep 8, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
There is provided a method for the ecologically safe disposal of lead-contaminated hazardous industrial wastes (such, as for example, those generated as discardable by-products in primary and secondary lead smelting operations, especially, blast furnace slags and matte), which comprises reducing the size of the lead-contaminated industrial wastes and treating them, prior to encapsulation in a hardenable material, with the naturally occurring zeolite, clinoptilolite, in an amount sufficient to prevent lead ions (Pb.sup.+2) from leaching out of the industrial wastes, through exposure to the action of atmospheric agents (e.g., hot air and rain, or as a result of cyclical freezing and thawing in temperature climates), even over an extended period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.