Competitiveness Of Silicon Metal Products

wallpapers Robot Tech 2021-01-29
Silica fume, also called micro-silica fume, scientific name "silica fume", is made by special trapping device to collect and process the smoke and dust escaping from exhaust gas during the process of smelting industrial silicon and ferrosilicon at high temperature in industrial electric furnace. In the escaping smoke and dust, the content of SiO2 accounts for about 90% of the total smoke and dust. The particle size is very small, and the average particle size is almost nanometer level, so it is called silica fume.
 
Although the early relative strength development of silica fume concrete is slower than that of pure cement concrete under the same water-binder ratio, the strength of silica fume concrete is greatly improved, and the absolute strength of silica fume concrete is higher than that of pure cement concrete. On the other hand, experience has shown that the early strength of HPC develops faster than that of NSC. Although the setting time of HPC may be slightly delayed, its hydration after setting will be greatly accelerated by the superplasticizer and silicon powder. The result is usually that the strength develops very quickly after setting.
 
For some silica fume concrete specimens with very low water-to-binder ratio dried or cured in air, there are reports of compression strength shrinkage (De Larrard and Aiticin 1993). This decrease in strength usually occurs after 90 d of age and is generally considered to be caused by internal self-drying and dry cracks. However, many other researchers' laboratory and field studies have shown that the later strength of HPC has not decreased. For example, the test results of all drill core samples from 3 months to 3 years from 6 different HPCs show that their strength is increasing. Of course, compared with NSC, HPC has less long-term strength growth potential.
 
Since metallic silicon is a hard and fragile material, the residue on the sieve cannot be effectively controlled during the grinding process. The phenomenon of over-grinding is serious, resulting in large product waste, high production costs, and product particle size that does not meet the standard, resulting in no product Competitiveness.

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