Pharyngeal swab sampling vehicle

Pharyngeal swab sampling vehicle
How many times can n95 masks be reused? In high-risk environments, the duration of use of n95 masks should not exceed 4 hours. If the mask is contaminated, deformed, damaged, or breathing hard, it n

Vanadium pentoxide recovery process

Recovery of vanadium pentoxide

(1) Recovery from vanadium slag: Vanadium slag is a vanadium-containing raw material with high vanadium content, and the recovery technology is relatively mature. At present, the general process is the sodium roasting p