Blue Powder

Blue Powder

 

a dust rich in zinc that is recovered in adapters equipped with condensers (extractors) during the production of zinc in horizontal retorts. The term “blue powder” also refers to the dust trapped in scrubbers; scrubbers are used to purify the gases of vertical retorts during zinc production.

Blue powder represents 2–5 percent of the zinc charged into a retort. The particle size of blue powder is less than 100 microns. Blue powder contains 85-95 percent Zn, 1.5-2.5 percent Pb, 2-6 percent C, 0.5-2 percent Cd, and 2-2.5 percent other impurities. It is sometimes rich in cadmium and may act as a raw material in the recovery of cadmium.

Blue powder with the highest degree of purity is used in the cementation (precipitation) of such metals as gold, silver, copper, cadmium, and indium, and also in the chemical industry. Impure blue powder is either processed separately to recover zinc and cadmium (the residue is returned into the initial charge of a retort) or fed directly into an initial charge.

References in periodicals archive ?
Its rural crime team was this week alerted to a poisoned squirrel found coated with blue powder on the moors.
The final tank dimensions were 384"(L) x 48"(W) x 48"(H) and the aquarium rested on a stable and durable blue powder coated steel stand that supported a full weight of 40,000 LBS.
Then there was some further chatting and talking and it is alleged Mr Rigby produced a small bag from his pocket and threw the bag of blue powder into his face.
After the police were alerted the female deputy head kept watch on Armitage and described hearing a 'pop' and seeing blue powder and smoke coming from the gun.
Tonight he attempts to navigate a sail boat across the English channel using a clutch of old-school methods, the most bizarre of which requires an excitable dog, blue powder and a Susan Boyle CD.
Spicegold is a shimmering electric blue powder shadow that looks as good on lids as it does as a liner.
DO UPDATE THE SMOKY EYE LOOK Copy Kate Bosworth - blend blue powder shadow on top of your usual charcoal.
Our investigation showed that the improvised explosive is actually a hoax device composed of a rifle grenade and a 40 mm M203 grenade, wiring and a soda can with blue powder which was not really an explosive,'' Pacinos said.
So we touched it and noticed that this blue powder came off on our hands," a substance Allen describes as being the consistency and color of pool cue chalk.
His teeth and gums were stained blue and there were traces of blue powder on his lips and around his mouth.
During the opening minutes of the performance, the dancers (Schmid and Pernette joined by Isabelle Celer and Dominique Jegou) are met with nervous coughs in the crowd as they stand motionless and nude on the dimly lit stage, their bodies covered only by thin patches of blue powder, which flakes off as they move onto the otherwise gleaming white floor.
It is available in a galvanized zinc or recycling blue powder coated finish.