Dispersing WC-Co to water
Dispersing WC-Co to water
(OP)
Hello!
I have a problem with dispersing tungsten carbide-cobalt to water. I try to make hard metal-water dispersion to spray drying. Aim is to use polyvinylalcohol as a binder. I use propeller mixer and I add powder slowly to fluid. Problem is following: If I have slow mixing speed, powder sedimentates to the bottom of vessel. With high speed, air is mixed to dispersion and it makes viscosity of dispersion very high (not able to pump). What kind of mixer should I use and what chemicals would make dispersing easier (wetting, antifoam)?
I have a problem with dispersing tungsten carbide-cobalt to water. I try to make hard metal-water dispersion to spray drying. Aim is to use polyvinylalcohol as a binder. I use propeller mixer and I add powder slowly to fluid. Problem is following: If I have slow mixing speed, powder sedimentates to the bottom of vessel. With high speed, air is mixed to dispersion and it makes viscosity of dispersion very high (not able to pump). What kind of mixer should I use and what chemicals would make dispersing easier (wetting, antifoam)?





RE: Dispersing WC-Co to water
m777182
RE: Dispersing WC-Co to water
RE: Dispersing WC-Co to water
Your vessel will be probably dished bottom type with side baffles, slightly higher to correspond to the standard proportions. You must not allow your particles to settle down because you will need an enormous power, up to 15 to 20 times the normal one to suspend it again!
If you do not want to be involved in calculations yourself, contact vendors of equipment and do not forget to point out very high density of your particles!
m777182