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Equipment for powder mixing
We have a hummer mill for powder pulverization - it works fine with dry powder.
The question is how to mix pulverized powder with liquid binder properly (for pressing it afterwards).
I was thinking something like paddle or ribbon mixer with sprayers is a way to go, but totally unsure. Maybe something like simple impact mixer (with knife blades) will work? Can somebody suggest what is usually used for this purpose?
Huge Thank you in advance! -
4 Replies
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For lab work, 1-2 kilos, hammer mill dry, drip or spray binder into a double-planetary mixer filled with powder, hammer mill again.
For production, paddle/ribbon/P-K blender or equivalent with sprayer to add binder, then hammer/pin/cone or jet mill.A good resource is Powder & Bulk Solids magazine -
Thank you Bob!
You are one of the most knowledgeable contributors here and always helping out, just want to thank you a lot!
I’ve checked the Powder & Bulk Solids magazine - pretty good source, although kind of hard to navigate.Hope you don’t mind another question re equipment.
I spoke to several equipment engineers (Hosokawa is extremely helpful!) and started to worry about pulverizing in hummer mill after binder incorporation. Most of them said that the mesh can get clogged if powder is sticky.
Have you ever experienced this problem with hummer mills? We are planning to buy another mill soon, so I am thinking if there is an advantage of pin mill over hummer mill? (Cannot go with jet type due to it’s power/pressure requirements) -
Way back in the dim mists of time, when I worked for Estee Lauder, we used Hosokawa hammer mills for all powders. (more advanced info requires consulting fees) The trick is that you have to change screens. Dry powder went through an 0.020 herringbone screen, if I remember right. Wet powder (after binder addition) went through an 0.250 screen.
There are also techniques that will help wet, sticky powder through a hammer mill - it shouldn’t be that hard to figure out.And yes, it is a major PITA to clean the mill after the batch is all done. -
Thank you Bob!
I’ll try the technique you’ve mentioned, hope my guess is correct, we’ll see
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