METHOD FOR TREATING LEAD ANODE SLIME
First Claim
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1. A method of treating lead anode slime, comprising the steps of:
- (a) providing a feed mixture comprising lead anode slime;
(b) smelting the feed mixture in a smelting furnace at a temperature above 1000°
C. to smelt the feed mixture and to volatized and remove at least part of antimony (Sb), fluoride (F) and arsenic (As) comprised in the feed mixture to obtain a first metal phase, a lead (Pb) slag and first process gas comprising volatilized Sb, F and As;
(c) cleaning the obtained first process gas in a venturi scrubber by contacting the said first process gas and a first venturi solution in the venturi scrubber to remove at least part of the Sb, F and As from the said first process gas to obtain a first cleaned process gas at least partly depleted of Sb, F and As and a second venturi solution comprising removed part of Sb, F and As;
(d) filtering at least part of the obtained second venturi solution to obtain a first venturi slime comprising Sb and a third venturi solution comprising F and As;
(e) adding a precipitation agent to the third venturi solution to precipitate at least part of F and As and filtering the thus obtained mixture to obtain a fourth venturi solution at least partly depleted of F and As and a F/As precipitate; and
(f) recycling the obtained fourth venturi solution to step (c) as a part of the first venturi solution.
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Abstract
The present invention relates to a method of treating lead anode slime having high fluorine and arsenic content, in particular to a method comprising smelting of the lead anode slime and cleaning the produced off gases in a one or more wet gas cleaning stages.
1 Citation
13 Claims
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1. A method of treating lead anode slime, comprising the steps of:
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(a) providing a feed mixture comprising lead anode slime; (b) smelting the feed mixture in a smelting furnace at a temperature above 1000°
C. to smelt the feed mixture and to volatized and remove at least part of antimony (Sb), fluoride (F) and arsenic (As) comprised in the feed mixture to obtain a first metal phase, a lead (Pb) slag and first process gas comprising volatilized Sb, F and As;(c) cleaning the obtained first process gas in a venturi scrubber by contacting the said first process gas and a first venturi solution in the venturi scrubber to remove at least part of the Sb, F and As from the said first process gas to obtain a first cleaned process gas at least partly depleted of Sb, F and As and a second venturi solution comprising removed part of Sb, F and As; (d) filtering at least part of the obtained second venturi solution to obtain a first venturi slime comprising Sb and a third venturi solution comprising F and As; (e) adding a precipitation agent to the third venturi solution to precipitate at least part of F and As and filtering the thus obtained mixture to obtain a fourth venturi solution at least partly depleted of F and As and a F/As precipitate; and (f) recycling the obtained fourth venturi solution to step (c) as a part of the first venturi solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification