What is the method of silica fume encryption? 1. One method of producing encrypted silica fume is to put the produced silica fume into silos. Compressed air blows in from the bottom of the bin, causing particles to tumble. As the particles tumble, they gather. The heavier agglomerates fall to the bottom of the silo and are collected periodically. Because the agglomerates are held together relatively weakly, they break down with mixing during concrete production. What is the method of silica fume encryption? 2. Another method of producing dense silica fume is to mechanically compress the material produced. Although mechanically densified silica fume has been sold in the US market, we are not aware of any mechanically densified material in the world. If you are interested, please contact us below.