High efficiency process for treating mixed metal waste
First Claim
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1. A process for recovering metals from electrical batteries having metal casings and for rendering hazardous materials present therein non-hazardous, wherein said process comprises the steps of:
- a) placing the electrical batteries while still enclosed in their metal casings in an aqueous solution of HX, wherein X is chlorine or bromine,and mechanically agitating said electrical batteries to form an aqueous reaction mixture into which gases released from said electrical batteries are absorbed;
b) ventilating hydrogen gas emitted from the solution;
c) filtering said reaction mixture to form a solid residual waste and a first filtrate containing water-soluble metal halides formed from the reaction of HX and the electrical batteries; and
d) recovering metals from said metal halides.
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Abstract
A process for rendering hazardous materials present in multi-element waste non-hazardous, and for recovering valuable components of said waste, particularly metals, comprising contacting the waste with an aqueous solution of HX, wherein X is halogen, thereby converting metals present in the waste to the corresponding halides, and subsequently separating said metal halides from other components of the reaction mixture and from each other.
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Citations
10 Claims
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1. A process for recovering metals from electrical batteries having metal casings and for rendering hazardous materials present therein non-hazardous, wherein said process comprises the steps of:
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a) placing the electrical batteries while still enclosed in their metal casings in an aqueous solution of HX, wherein X is chlorine or bromine, and mechanically agitating said electrical batteries to form an aqueous reaction mixture into which gases released from said electrical batteries are absorbed; b) ventilating hydrogen gas emitted from the solution; c) filtering said reaction mixture to form a solid residual waste and a first filtrate containing water-soluble metal halides formed from the reaction of HX and the electrical batteries; and d) recovering metals from said metal halides. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification