Feasibility of extracting lead from lead battery recycling site soil using high‐concentration chloride solutions

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Abstract
This paper describes research on a technique for removing lead from soil using 4 ‐6 M chloride solutions at pH 4. Two soils we re studied in this work: (1) a high‐silt, highclay, lead battery recycling site (LBRS) soil and (2) a highsand LBRS soil. Testing determined that a batch‐extraction process using chloride solutions reduced the lead in the high‐silt, high‐clay soil from 67,400 to 1,500–2,000 mg/kg and in the high‐sand soil from 14,400 to 600 mg/kg. Both treated soils passed the EPA's Toxicity Characteristic Leachate Procedure test. In addition, concentrated chloride solutions we re as effective as both EDTA and HCl at removing lead from the high‐silt, high‐clay soil. The ability of chloride solutions to remove lead as efficiently as EDTA while providing easy recovery of the chloride‐complexed lead illustrates the viability of the process.