Please don't read selectively.
I already explained that such 'sparks' are typically jagged edged and not perfectly formed spheres, or slightly pear shaped, depending on how far they fall when cooling. So please dont refer to your 'scraping of sparks ' as being microspheres. Those are microparticles. And such jagged edged 'sparks' are what is normally found in all background dust in an industrial zone, but in a far less concentration.
Also, the very large percentage of microspheres that was identified in the dust are elemental iron, not scraped off steel particles. And elemental iron is impossible to separate out from steel simply by friction.
But elemental iron is a bi-product of a thermetic reaction of course.
http://www.nmsr.org/nmsr911.htm
The iron is heated red hot or hotter and subjected to hurricane force blast furnace like wind. The iron flakes are liberated as small particles and some iron is vaporized. Like drops of water, the iron flakes form molten spheres that solidify and the fume also condenses into spheres, the most efficient geometrical form. … The formation of iron and other type spheres at temperatures obtainable by the combustion of petroleum or coal based fuels is not a new or unique process. These spheres are the same as iron and alumino-silicate spheres in the well-studied fly ash formed from contaminants in coal as it is burned in furnaces. – Rich Lee"
The answer to the mystery of the microspheres - "Iron melts only at temperatures far higher than possible in normal fires, so how could microspheres have possibly been formed on 9/11?" – is simply that very small metal particles have much lower melting points than their bulk material counterparts (around 900 o C for iron nanoparticles, as opposed to 1535 o C for bulk iron). This is called the "thermodynamic size effect." The towers contained thousands of computers and electric gadgets. Wires and filaments and meshes from electronics, as well as thin rust flakes and other small iron particles, could all have easily been made into microspheres during the WTC conflagration. To see a vivid demonstration of this phenomenon, watch the video on NMSR's YouTube channel, 'theNMSR', in which a BIC lighter is used to burn steel wool, creating numerous iron microspheres without any Thermite at all!
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