Leady oxides particle size distribution

Leady oxide manufacture. Pure lead ingots are subjected to simultaneous grinding and surface oxidation (ball-mill method) or are melted and oxidized in humidified air (Barton pot method). A 60—80% oxidized lead powder (leady oxide) is obtained with a corresponding particle size distribution. 

A definite amount of leady oxide is separated by a series of sieves of different mesh size placed above each other into fractions with different particle size distribution. The leady oxide is usually fed in the form of suspension. After a certain period of vibration of the sieve system, the weights of the different powder fractions are measured. A particle size distribution curve is plotted. 

Figure 5.11 presents the particle size distribution curve for leady oxide produced by the ball mill method. The determination was performed by sedimentation analysis of the leady oxide in 0.1% NaPOs solution at 36 °C. The obtained data evidence that all leady oxide particles are... 

Particle size distribution of ball mill leady oxide powder. 

Logarithmic plots of the particle size distribution by diameter for ball mill and Barton pot leady oxides are presented in Fig. 5.12 [22]. The two curves differ significantly, indicating considerably higher percentage of particles with diameters less than 1 pm in the ball mill oxide as compared to the Barton pot oxide. This particle size distribution is responsible for the higher reactivity and the acid absorption of ball mill leady oxide, as well as for its lower apparent density. 

Figure 5.13 shows a typical particle size distribution for leady oxides after different treatments in a hammer mill [23]. A decrease of the air flow rate through the mill leads to a decrease in median particle diameter from 5.3 to 2.1 pm and an increase of the percent share... 

Particle size distribution curves for ball mill and Barton pot leady oxides. Logarithmic plots [22]. 

Effect of mill conditions on the particle size distribution of leady oxide [23]. 

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