| abstract |
The present invention relates to a method of separating arsenic and optionally antimony from a starting material, said method comprising the steps of: - contacting a first portion of iron, arsenic, copper and optionally antimony with a low acid A first solid-liquid separation step in which a first solid leach residue is separated from a first leach solution, a second solid-liquid separation step for leaching a second portion of iron, arsenic, copper and optionally antimony into a second leach solution A second solid-liquid separation step in which a second solid leach residue is obtained and a second leach solution is recycled back to the low acid leach step, a precipitate comprising ferric arsenate and optionally antimony compounds, And a third solid-liquid separation step in which the copper-containing solution is separated from the obtained precipitate. |