Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1991-03-21
1992-07-07
Morris, Theodore
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 13, 134 10, 134 28, 134 29, 134 251, 423DIG20, 423588, 423 89, B08B 308, C22B 306, C22B 312, C22B 320
Patent
active
051279630
ABSTRACT:
A novel chemical extraction/washing process is described for detoxifying lead contaminated materials, and in particular, for detoxifying broken lead/acid storage battery casings made from ebonite. In particular, the preferred process of the invention enables the lead content of broken ebonite battery casing material to be reduced to the point that the processed ebonite is no longer a potential harzardous waste by any EPA definition. In the preferred embodiment, the novel process of the invention makes use of the chemical leaching capabilities of nitric acid, and the water solubility of lead nitrates, to dissolve and then wash away the combined lead compounds that contaminate and render hazardous broken ebonite battyer casing material, leaving a clean and usable ebonite product for recycling.
REFERENCES:
patent: 1168418 (1916-01-01), Ramage
patent: 4460442 (1984-07-01), Ducati
patent: 4927510 (1990-05-01), Olper et al.
Cadman and Dellinger, "Techniques for Removing Metals from Process Wastewater", Chemical Engineering, Apr. 15, 1974, p. 79.
Hartup George R.
Leonard Jack E.
El-Arini Zeinab
Morris Theodore
Rubber Recycling, Inc.
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