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This invention is a two-stage polishing process that results in the removal of interfering soluble selenium (selenious acid, H2SeO3) from the acidic stack wash of copper smelters, making the resulting solution ideal as an ion exchange feed solution from which the critical meta

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The Vacuum Safety Relief Valve (VSRV or "Flapper Valve") provides several key safety features not available commercially. First it works to ensure a vacuum vessel is only pumped or re-pumped when ready i.e. manual action.