Alumina Bayer process leaching experiment
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I have just started working with the alumina production process, and I am currently conducting leaching experiments. The amount of residue remaining after dissolution is relatively large; I’m not sure if this is caused by the precipitation of a large amount of aluminum oxide. If so, what methods can be used for analysis? Ore composition: alumina: 92%, silica: 1.65%, titanium oxide: 0.73%. The dissolution temperature is 250 degrees, the time is 2 hours, the amount of ore added is 24.86 g, and the amount of alkali (sodium hydroxide) is 28.39 g dissolved in 100 ML of water. I’m not sure if these process conditions are correct; I seek advice from those with more experience. Thank you!
The temperature required for production is 260
Your experiment has the following issues: 1. The leaching conditions need to be determined based on the type of ore； 2. The composition of your ore is suspicious; the alumina content is too high. Are the results of your raw material analysis correct? 3. The dissolution temperature and dissolution time do not meet the requirements of actual industrial production ； 4. The concentration of the dissolved alkaline solution is too low.
It was recently improved. Bauxite is processed; could you provide the process parameters used in actual industrial production?
Bro, could you give me some reference on the process parameters? Thank you!
I studied alumina in college, but I forgot – it’s not a mineral, right? Minerals usually contain large amounts of red mud!
Increase the liquid-solid ratio to prevent sodium aluminate from crystallizing; if the crystals are too fine, they are difficult to filter. Seeds need to be added to the enamel tank so that the crystals can grow larger and thus be easier to filter!
Under the above conditions, 7.1 g of red mud was obtained after dissolution and filtration, which seems like a relatively large amount
It looks a bit confusing. It seems you mean during the precipitation process. I just did the dissolution.
Increasing the liquid-solid ratio means diluting and filtering after the leaching is complete? Can the supersaturated dissolution of sodium aluminate be eliminated after dilution? I’m confused. . .
It’s impossible to achieve such a high level of A/S even after processing. You can discuss the details in a private message.