Electrostatic charging, pneumatic transport

Dust explosion possible if in powder or granular form, mixed with air. If dry, it can be charged electrostatically by swirling, pneumatic transport, pouring, etc. 

The probability of the formation of polymer agglomerates is appreciably increased by electrostatic interactions. This phenomenon is, inter alia, also known in the handling of polymer powders. Owing to the fact that the polymer particles are not electrically conductive, electrostatic charging occurs in pneumatic transport systems in an... 

Ally, M.R. and G. E. Klinzing, Inter-relation of Electrostatic Charging and Pressure Drops in Pneumatic Transport," Powder Tech, (short Comm.) 44, 1985, pp. 85-88. 

Bo ngpoint/C 249 Melting point. 93 Fla8hp<. X 112 Relativedensity (water—1) 0.9 Relativevapordensity(air-1) 5.7 Relative density at 20C of saturated mixture vapor/air(air-1) 1 Vapor pressure, mm Hg at 1259.9 Reilativemolecuiarmass l 4.2 Qrossformula WHITE CRYSTALS In dry state can form electrostatic charge if stirred, transported pneumatically, poured etc. Reacts with strong oxidants. ... 

In dry state can form electrostatic charge If stirred, transported pneumatically, poured, etc. 

Ally MR, Klinzing GE. Inter-relation of electrostatic charging and pressure drops in pneumatic transport. Powder Tech 44(l) 85-88, 1985. 

In his treatment of clouds of particles, Soo (1967) considered most systems having intimate contact all the way from packed beds through fluidization to dense-phase pneumatic transport. His analysis of clouds by individual particle bombardments between themselves and the confining wall relies on impact mechanics. This approach has served as a basis for both heat and electrostatic charge transfer in particulate systems. The elasticity of the particles and contact times became vital parameters in the analysis. 

Before processing, wool has to be scoured to remove contaminating particles such as dirt, sweat, and wool fat. The wool is dried in perforated cylinder driers and then opened in the breaker card. After these stages the fibers are oiled to alter the frictional properties of the fibers and to prevent electrostatic charging. The fibers are then pneumatically transported to the mixing chamber. Because raw wool scouring systems are very expensive and subject to strict environmental protection laws, most worsted spinning mills purchase scoured wool, card slivers, or combed slivers. 

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