[mehdimahmoodi]

hi.
i have a question about spray dryer, i already appreciate you for your attention.
i had a 100 ml of water soluble copper nitrate (Cu(NO3)2.3H2O) (50 wt% water ), i.e.. my solution contains 50 g water and g copper nitrate as above mentioned formula) and used Mini Spray Dryer  and at last i just gain about 10 g of dried powders of copper powder!!! i think this is because this powder is very Viscous and almost 80 percent of it precipitated on walls of chamber of this devise , can you help me with this problems?!
or just clarify exact parameter for adjustment the devise for this solution or Proposal some additional matter to solve this issue. 
best regard

[Arkcon]

Generally, when spray drying something, say milk or eggs, the solution is "slurryed up" with excess water so its spray better.  You're doing something very different, making a very strong solution of soluble solid in water.  Also, what can you tell us about your drying conditions -- how warm is it in the chamber, and do you pull a vacuum to dry things better.

[mehdimahmoodi]

hi thank you dear friend for your answer, i set chamber temp. on 180 0C (degree of centigrade). thus based on your advice its better to i repeat my test with different ratio, for ex. 20 wt%, (20 g of copper nitrate  based solution and 80 g water)?! indeed, i use Mini Spray Dryer B-290 – Particle technology in the lab. you can see poster of it in attachment.