Operational details of iron removal using xanthosiderite method

2016-12-20View Original

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Dear fellow sailors, I have been using the xanthoferrous sulfate method to remove iron recently. The solution contains 25 g/L of ferric chloride (based on iron content, to simulate a chloride-based system); sodium sulfate is added in an amount 1.2 times the stoichiometric ratio, and then 30% sodium hydroxide is added slowly to adjust the pH. It seems that iron hydroxide precipitate forms right from the start, and it’s difficult to filter this precipitate. I’m not sure why My temperature is around 85°C; it’s sometimes not very stable and drops to 80°C. Does the temperature affect whether the precipitate is iron hydroxide or jarosite?

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Operational details of iron removal using xanthosiderite method

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