Claims
- 1. A process for treating lead-contaminated, solid industrial wastes to make said wastes ecologically safe for disposal which comprises, (a) reducing the size of the lead-contaminated, solid industrial waste, (b) admixing said solid industrial waste with a mixture comprising at least about 10% by weight of an encapsulating, hardenable material in solid, granular form and at least about 10% by weight of a zeolite capable of binding the lead ions in the lead-contaminated, solid industrial waste to lower the leachable lead in the admixture after slurrying with water to below about 5 ppm, (c) adding water to the admixture in an amount sufficient to form, with agitation, a homogeneous slurry of said industrial waste, zeolite and encapsulating, hardenable material, and (d) allowing the slurry to harden.
- 2. The process of claim 1 wherein the zeolite capable of binding the lead ions in the industrial waste is clinoptilolite.
- 3. The process of claim 2 wherein the encapsulating, hardenable material is Portland Cement.
- 4. The process of claim 1 wherein the lead-contaminated industrial waste is reduced in size by crushing.
- 5. The process of claim 3 wherein the Portland Cement and clinoptilolite are used in about equal amounts by weight.
- 6. A process for treating the toxic, lead-contaminated, solid discardable by-products generated in primary and secondary lead smelting operations to make said lead-contaminated, solid discardable by-products ecologically safe for disposal which comprises, (a) reducing the size of the lead-contaminated, solid discardable by-products, (b) admixing said lead-contaminated, solid discardable by-products with a mixture comprising at least about 10% by weight of an encapsulating, hardenable material and at least about 10% by weight of a zeolite capable of binding the lead ions in the lead-contaminated, solid discardable by-products, to lower the leachable lead in the admixture after slurrying with water to below about 5 ppm, (C) adding water to the admixture in an amount sufficient to form, with agitation, a homogeneous slurry of lead-contaminated, solid discardable by-products, zeolite and encapsulating, hardenable material, and (d) allowing slurry to harden.
- 7. The process of claim 6 wherein the zeolite capable of binding the lead ions in the lead-contaminated, solid discardable by-products is clinoptilolite.
- 8. The process of claim 7 wherein the encapsulating, hardenable material is Portland Cement.
- 9. The process of claim 6 wherein the lead-contaminated, solid discardable by-product generated in primary and secondary lead smelting operations is reduced in size by crushing.
- 10. The process of claim 8 wherein the Portland Cement and clinoptilolite are used in about equal amounts by weight.
- 11. A hardened slurry comprising an admixture of lead-contaminated, solid industrial waste, at least about 10% by weight of an encapsulating hardenable material and at least about 10% by weight of a zeolite capable of binding the lead ions in the solid industrial waste to lower the leachable lead in the hardened slurry to below about 5 ppm.
- 12. The hardened slurry of claim 11 wherein the zeolite capable of binding the lead ions in the solid industrial waste is clinoptilolite.
- 13. The hardened slurry of claim 12 wherein the encapsulating, hardenable material is Portland Cement.
- 14. A hardened slurry comprising an admixture of lead-contaminated, solid discardable by-products generated by primary or secondary lead smelting operations, at least about 10% by weight of an encapsulating hardenable material and at least about 10% by weight of a zeolite capable of binding the lead ions in said lead-contaminated, solid discardable by-products to lower the leachable lead in the hardened slurry to below about 5 ppm.
- 15. The hardened slurry of claim 14 wherein the zeolite capable of binding the lead ions in the lead-contaminated, solid discardable by-products is clinoptilolite.
- 16. The hardened slurry of claim 15 wherein the encapsulating, hardenable material is Portland Cement.
- 17. The hardened slurry of claim 16 wherein the Portland Cement and clinoptilolite are used in about equal amounts by weight.
RELATED APPLICATIONS
This application is a continuation-in-part of the copending U.S. patent application Ser. No. 07/761,163, now abandoned, which was filed on Sep. 11, 1991.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4116705 |
Chappell |
Sep 1978 |
|
4537710 |
Komarneni et al. |
Aug 1985 |
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Non-Patent Literature Citations (1)
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Dialog Abstract--"Studies on cement solidification of radioactive chemical slurry" Suzhen et al., China (Mar. 1986). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
761163 |
Sep 1991 |
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