초록

Further, the method of the invention can be utilized in a multi-stage recovery system to selectively separate and recover targeted metals at even higher efficiencies.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process for separating and recovering metals from acidic waste streams and acidic process liquids comprising:(a) feeding an acidic waste stream or acidic process liquid into a chamber, said acidic waste stream or acidic process liquid containing metals including cadmi

[ What is claimed is:] [1.]1. A process for separating and recovering metals from acidic waste streams and acidic process liquids comprising:(a) feeding an acidic waste stream or acidic process liquid into a chamber, said acidic waste stream or acidic process liquid containing metals including cadmium and lead and having a pH of from about 0.0 to about 4.0;(b) adding a complexing agent to said acidic waste stream or acidic process liquid to form metal ion complexes in said waste stream or process liquid to cause said metals to precipitate in the form of a sludge, said complexing agent being a mixture of water, an inorganic base selected from the group consisting of sodium hydroxide, calcium hydroxide and potassium hydroxide and a thiocarbamate or dithiocarbamate selected from the group consisting of sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, and mixtures thereof;(c) dewatering and drying said sludge to a substantially anhydrous state; and,(d) melting said dewatered and dried sludge to recover said metals therefrom.