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 ?
In their gender reveal party over the weekend in Avant Garde CrossFit gym, it was made known that the two are having another baby boy when Arellano popped one of the balloons and a cloud of blue powder erupted.
A blue powder popped at the end of the challenge signifying that they are having a baby boy.
Paramedic Andrew Tite said the teenager was very pale and said he had taken a blue powder mixed with a drink, which he believed was MDMA.
Then there are the drizzles and the powders: vanilla syrup, mango syrup, blue drizzle (or white chocolate mocha sauce, according to the list of ingredients), classic syrup, pink powder and sour blue powder.
Police warning about mystery powder UNIDENTIFIED blue powder has contaminated a large section of one bank of the River Usk in Newport.
One morning, bird-watching in the cemetery (his secret hobby), he sees an elderly woman sniffing brilliant blue powder from a gravestone.
Its rural crime team was this week alerted to a poisoned squirrel found coated with blue powder on the moors.
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.
7-Hydrazinyl-1-phenyl-3-phenyldiazenyl-5- propyl-1H-pyrimido[4,5-e][1,3,4]thiadiazine 2g This compound was obtained as a blue powder in 85% yield, mp 265-266oC (dec); IR (KBr disk): n, 1750 cm-1, 2930 cm-1, 3340 cm-1 and 3440 cm-1; 1H-NMR: (CDCl3) d, 1.
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.