Unverdichteter Silicadampf, auch bekannt als roher Silicastaub oder primärer Silicastaub, ist ein Nebenprodukt des Hochtemperaturschmelzens von Ferrosilizium in industriellen Elektroöfen.
What is raw silica fume (primärer Silikatrauch)?
Raw silica ash is a gaseous dust released during the production of silicon metal or ferrosilicon alloy at high temperatures and collected by condensation. It has the characteristics of large specific surface area, high activity and small fineness. Because of its low bulk density of approximately 200+ kg per cubic meter, it is larger than the equivalent weight of encrypted silica fume, which can increase costs in terms of transportation.
Production process of Undensified silica fume
Abgasreinigung
Das aus dem Elektroofen ausgetragene Rauchgas strömt durch den Abzug, the main flue gas pipeline, kühlt durch den Kühler ab und gelangt dann in den Zyklonabscheider, und passiert dann den Stoffbeutel-Staubsammler. Das Rauchgas tritt durch das Gebläse in den Beutelfilter ein, der Staub wird von der Innenfläche des Filterbeutels abgefangen, und das gereinigte Rauchgas, das den Umweltschutzstandard erfüllt, wird von der Außenseite des Filterbeutels abgeführt und steigt zur Oberseite des Staubabscheiders, um durch die Austrittsöffnung in die Atmosphäre abgeführt zu werden.
Silica Fume collection
Wenn der Laufwiderstand oder die Zeit des Geräts den eingestellten Wert erreicht, Der Ascheentladevorgang beginnt. Using the negative pressure of the front section of the main fan, the process of cleaning silica dust from each compartment of the bag dust collector is realized through the switch of the anti-suction duct and the inlet and outlet duct valves, and the recovered dust is sent to the Silica Fume homogenizing device by the fan through the ash conveying duct.
Encryption processing (Verdichteter Silica-Rauch)
When making silica fume, manufacturers often carry out the third step, which is encryption processing. Considering the transportation cost, and other specific application needs, Hersteller von Kieselsäure will provide different microsilica according to the customer’s situation, so this is the reason why encrypted microsilica is more popular. Jedoch, Undensified silica fume also has many advantages.
What are the advantages of Undensified silica fume?
Silica Fume is often encrypted, which is also due to the characteristics of the Undensified silica fume itself, low bulk density resulting in higher transport costs, Hersteller müssen mehr Verpackungskosten investieren, Zusätzlich, Der unverdichtete Quarzstaub ist aktiver, Aufgrund des Phänomens der Flugasche vor Ort kann es leicht zu Abdriften kommen, was zu Sekundärverschmutzung führt. Jedoch, there are always two sides of a coin, there are disadvantages which means that it also has advantages, the Undensified silica fume also has the advantages of other types of silica fume do not have, wie folgt.
The Undensified silica fume is more convenient to use, aufgrund der Eigenschaften kleiner Partikel, leicht zu verteilen, Grundsätzlich muss die Betonmischzeit nicht verlängert werden. Es hat die Eigenschaft, die Druck- und Biegefestigkeit von Beton zu erhöhen, Wasserdurchdringungswiderstand, gute Füllwirkung und gute Anpassungsfähigkeit an wasserreduzierende Mittel. The color of as-built silica fume will be lighter than that of encrypted silica fume, Daher wird die Farbe des Betons nicht intensiver.
Silica fume improves the performance of concrete through physical and chemical mechanisms. Physical mechanisms include reducing bleed-through, providing nucleation point formation, und filling solid particles more efficiently.
Reduzierte Durchlässigkeit: Silica fume in fresh concrete significantly reduces permeability and enhances cohesion as a physical effect, the result of incorporating very fine particles into the mix. The higher the silica fume content, the more pronounced the effect. Enhanced bonding will benefit the hardened concrete structure by reducing segregation and gaps in the reinforcement and coarse aggregates.
Provide nodule point formation: Silica fume accelerates the hydration reaction of cement by providing nodule points in the early stages, in which the cement hydration products are more easily resolved from solution to form nodule points.
Granular packing: In hardened concrete, silica fume particles improve the filling of the solid material by occupying the gaps between cement particles, just as cement occupies the gaps between particles of fine aggregate, which in turn occupy the gaps between particles of coarse aggregate, an analogy that applies only when the surface forces between cement particles are negligible, d.h., when sufficient water reducing agent is present to overcome the effect of surface forces . In most concretes used for construction purposes, the addition of more silica fume leads to an increase in water demand, requiring the use of water reducers to increase workability.
To know the Difference Between Densified and Undensified Silica Fume, bitte besuche: https://hsamaterial.com/blog/difference-between-densified-and-undensified-silica-fume.html
Although the Undensified silica fume has its own performance limitations, jedoch, it also has many advantages, specific areas of use can be consulted Silica Fume manufacturer Henan Superior Abrasives, we can provide customers in different industries with different uses of high quality microsilica powder and provide technical support throughout the process, welcome your consultation.
