Production of Noble Metal Powders

Crystallization of oxide high iron melts

“…As a result of cooling granular material with the size of particles 1.5 -2.0 mm was formed. Calculation of cooling time for these particles has been performed according to equation [4]: The granules generated were exposed to isothermal annealing in electric resistant furnace (duration 5 and 60 minutes) at a temperature 1023 К in inert atmosphere.…”

Recovery of palladium(II) by methanogenic granular sludge

“…1A and F, rapid removal of Pd(II) was observed in cell-free assays supplemented with H 2 and formate, indicating the ability of both compounds to reduce Pd(II) abiotically. In this regard it is important to note that previous studies have shown that H 2 at ambient temperature can effectively reduce PdCl 2À 4 in aqueous solution to Pd(0) (Henglein, 2000), and formate and its salts are commonly used in chemical reduction methods to obtain palladium powder (Naboychenko and Murashova, 2009). Several studies investigating the effect of microorganisms on Pd(II) reduction by H 2 or formate have reported that reduction did not occur in cell-free controls, suggesting that microbial activity was required for the reaction to occur (Lloyd et al, 1998;Yong et al, 2002).…”

The influence of gas pressure and temperature on the characteristics of aluminium powder produced by a novel low-pressure hot gas atomisation process

“…Theoretically speaking, the increase of the gas temperature affects positively the internal gas energy towards producing tinier metallic particles. The decrease in the mean diameter of the powder depends on the square root of the absolute gas temperature [36,37]. In this case, a gas temperature of 473.15 K (200°C) and 673.15 K (400°C) reduces the particle size by 11% and 19%, respectively.…”