Method for recovering lead from lead-containing solid wastes
A solid waste and chloride technology, applied in the field of lead recovery, can solve the problems of complex lead paste, inability to directly apply lead-containing solid waste recycling, difficult recovery and treatment, etc., and achieves high lead recovery rate, low processing cost, and easy operation. Effect
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[0036] Example 1
[0037] This embodiment includes the following steps:
[0038] (1) Lead leaching in concentrated salt solution: crush the lead slag of electrolytic manganese anode mud, ball mill to below 60 mesh, weigh 50g, leaching in 200ml sodium chloride-calcium chloride solution, the concentration of sodium chloride in the solution 300g / L, calcium chloride concentration 20g / L, leaching is accompanied by stirring, leaching temperature is 80°C, leaching time is 2 hours; after filtering, a lead-containing filtrate is obtained;
[0039] (2) Precipitation of lead in alkaline solution: Add 10wt% NaOH solution (2ml) to the filtrate obtained in step (1) to make the PbCl in the solution 2 Completely converted into basic lead chloride, the conversion temperature is 80°C, the conversion time is 32 minutes, the reaction is complete, filtered and washed, to obtain filtrate and filter residue, the filter residue is basic lead chloride;
[0040] (3) Conversion of basic lead chloride: add the b...
Example Embodiment
[0043] Example 2
[0044] This embodiment includes the following steps:
[0045] (1) Leaching lead in concentrated salt solution: crush the lead slag of electrolytic manganese anode sludge, ball mill to below 60 mesh, weigh 50g, leaching in 300ml sodium chloride-calcium chloride solution, the concentration of sodium chloride in the solution 300g / L, the concentration of calcium chloride is 40g / L, the leaching is accompanied by stirring, the leaching temperature is 90°C, and the leaching time is 1.5 hours; filtered to obtain filtrate and filter residue;
[0046] (2) Precipitation of lead in alkaline solution: Add 10wt% NaOH solution (3.5ml) to the filtrate obtained in step (1) to make the PbCl in the solution 2 Completely converted into basic lead chloride, the conversion temperature is 90°C, the conversion time is 30 minutes, the reaction is complete, filtered and washed to obtain filtrate and filter residue, the filter residue is basic lead chloride;
[0047] (3) Conversion of basic l...
Example Embodiment
[0050] Example 3
[0051] This embodiment includes the following steps:
[0052] (1) Lead leaching in concentrated salt solution: crush the lead slag of electrolytic manganese anode sludge, ball mill to below 60 mesh, weigh 50g, leaching in 300ml calcium chloride solution with concentration of 350g / L, leaching temperature is 70℃ , Leaching time is 1.0 hour; filter to obtain filtrate and filter residue;
[0053] (2) Precipitation of lead in alkaline solution: Add 10wt% NaOH solution (3.5ml) to the filtrate obtained in step (1) to make the PbCl in the solution 2 Completely converted into basic lead chloride, the conversion temperature is 70°C, the conversion time is 30 minutes, the reaction is complete, filtered and washed, to obtain filtrate and filter residue, the filter residue is basic lead chloride;
[0054] (3) Conversion of basic lead chloride: add the basic lead chloride obtained in step (2) to a 10wt% NaOH solution to completely convert the basic lead chloride in the solution i...
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