Process for stabilizing metals in ash

Details Process for stabilizing metals in ash Process for stabilizing metals in ash

1994-03-31

1995-04-04

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210751, 210912, 588256, C02F 162, C02F 1100

Patent

active

054034965

ABSTRACT:
A process for stabilizing metals in ash to prevent leaching of the metals is disclosed. The pH of an aqueous slurry of ash is reduced to less than 5 in the presence of an iron salt. The pH-reduced slurry is then treated with an organo sulfur containing compound and an alkaline earth metal oxide or hydroxide in specific weight proportions relative to the iron salt and to each other.

REFERENCES:
patent: 4698162 (1987-10-01), Guibault et al.
patent: 4943377 (1990-07-01), Legare, III
patent: 4957634 (1990-09-01), Bowers, Jr.
patent: 5259975 (1993-11-01), Mohn
patent: 5264135 (1993-11-01), Mohn
Product Data Sheet for AMERSEP.RTM. 5320 Coagulant (1991).
Product Data Sheet for AMERSEP MP-3R Metals Precipitant (1991).
Product Data Sheet for AMERSEP MP-7 Metals Precipitant (1989).
Turpin et al, "Methods to Treat EP Toxic Foundry Wastes and Wastewaters AFS Transactions" (1990).

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