The chemical composition of lead powder is a mixture of metal lead and lead, the lead powder produced by ball milling can obtain 60% -70% of the lead, and Barton Law powder can be as high as 80% oxidation. lead.(3) Real density, visual density, minus density
The density of the lead powder is in a sense that is related to the size of the particles. In fact, the lead powder of fine particles generally contains more leads, and the coarse particle lead powder is more lead. The real density of the lead powder containing metal lead is high, so density is related to particle size.
1 Real density real density is determined by the solid relative density determination of the particles in the lead powder, only by the density of their particles. The real density can be calculated based on the analytical data of the lead oxide and the metal lead content, that is, their respective relative densities.
2 The visual density view density (perfusion density) is an important process parameter. Therefore, its viewpoint density is measured on the lead 'powder, which can ensure stable production characteristics.
There are standard test methods and equipment for the measurement method of the visual density. An internationally versatile "Scott container" test density instrument called Scott density. The flour powder is freely dropped into the Scott container, which can be calculated.
Scott container is a box of a rectangular cylinder, mounted on a base, and the box is filled with free fall and then shaped. The general hem (W.) minus the Scott container (Wi).
Container head powder net weight W One W. One W,
The ratio of the total volume (container size is Scott container volume) D first W / V formula, W is the finishing weight; V is Scott container volume; D is the visual density (in units of CM3). The data measured by this method does not represent the relationship between particle size. The lead pink density obtained from Scott visual density is between 1.4-1.8 g / cm3.
3 True Density The mockup density can also be determined using the same standard method. When the lead powder filled with the container (to be powered), or smash (tweeter, tightening), this parameter is similar to the visual density. Both the world's battery factories have their own standards or approval methods to determine the minus density. The key is the quality of lead powder (the degree of force and the mockup), but the mockup density is more practical for the production tubular battery and the dry charge battery.
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