Design of stirrers for copper extraction mixed clarification tanks
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When designing agitators for copper extraction mixed-settling tanks, different manufacturers seem to use different designs for the diameter, blade length, and width of the agitator impellers; some of these impellers even have auxiliary impellers at their upper end. The solvent extraction manual generally specifies that the diameter of the impeller should be one-third of the side length of the mixing chamber, with the blade length being 0.25 times the diameter and the width being 0.16 times the diameter. I saw a plant with a capacity of 500 tons; the side length of the mixing chamber is 1400 mm, the diameter of the impeller is 800 mm, it has 6 blades, with each blade being 275 mm long and 90 mm wide. The auxiliary impeller has 6 blades, with a blade length of 150 mm and a width of 95 mm. Is this design reasonable? Let’s discuss how to design it more reasonably.
-- It’s only 500 tons – that’s too small; there’s no need for an auxiliary impeller! --
These design choices are based on the material properties and operating conditions, with empirical values provided in design manuals under ideal conditions. In practical applications, it is impossible to meet such ideal conditions; this is true for mixing processes as well – often, experience is needed to determine the size that yields the best results.
The design of the impeller seems quite complex; although it consists of just a few simple blades. Those who know about this could share their insights so that we can all learn from it
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How to design it reasonably? This issue is a bit too broad; what’s reasonable is to achieve mixing effects at the lowest possible cost. The purpose of mixing is to ensure that the liquid undergoes a certain number of cycles, and the main factors determining this number of cycles are the shape, diameter, and speed of the impeller. A higher speed requires a smaller impeller, while a lower speed necessitates a larger one. Therefore, different manufacturers may design their impellers differently, but the goal remains the same: to achieve the necessary number of mixing cycles.
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This post was last edited by An indifferent life on 2012-6-7 23:40. I understand that what is reasonable is to achieve the desired performance while minimizing investment and saving energy. In fact, mixing designs vary greatly, and a proper combination is quite important. To meet the process requirements, it is necessary to take into account both pumping and mixing, while also ensuring a certain discharge volume. There are many considerations involved in stirring for organic extraction, requiring certain engineering experience and a large number of simulation experiments. Imported mixer manufacturers often conduct sample analysis and charge a certain fee for the tests, making them expensive. Of course, domestic mixers can be manufactured after all; there are already many engineering projects in China where they perform very well. I recommend that everyone support domestic products and cheer for localization!