Batch and flow leaching studies were carried out using a lime-precipitated plating waste sludge to study the influence of soluble silicates on metal ion leachability. A reduction in metal ion leaching was observed when soluble silicates were used either alone or with a portland cement/fly ash combination. These results suggest that sodium silicate reduces the solubility of metal ions in the waste matrix in addition to protecting the matrix from mild acidic breakdown.
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