| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for stably producing scorodite having low arsenic elution. SOLUTION: The method for producing scorodite comprises a step of washing the synthesized and separated scorodite with water and separating the washed scorodite from the used washing water by solid-liquid separation. The step is carried out many times. After the n-th step (n≥1) is carried out, the concentration of a liquid component after reaction containing at least one selected from the group consisting of Cu, S and Fe contained in the used washing water and the concentration of the As ion contained therein are measured. The concentration of the liquid component after reaction to be targeted is decided according to the measured results and set. The step is repeated to the extent that the measured concentration of the liquid component after reaction in the washing water used for washing the synthesized and separated scorodite is reduced to the targeted value or lower. COPYRIGHT: (C)2010,JPO&INPIT
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