Supply Situation And Quality Standards Of Silica Fume

Silica fume is fine particles from cooling high SiO2 of submerged arc furnace in ferrosilicon or silicon metal production process

. The silica fume is filtered and collected by collector. General micro-silica fumes color is between light gray and dark gray. Its color depends on the carbon and iron oxide content. The higher the carbon content is, the darker the color will become. Color of encryption silica fume is darker than color of natural silica fume.

Silica fume can highly disperse in the concrete. It is filled between the cement particles and to increase the density. Silicon powder has a high activity and it can make more pure quartz, coke and wood chips by the reduction of by-products, smelting complex reaction. Of these, quartz stone and carbon at 1750 , the reduction reaction to produce unstable carbon monoxide at a temperature higher than 2160 C of SiO containing gasification sent encountered below 1100 C air and oxygen anti-more comprehensive and cement water 00kg/m3, the original gray-state micro-silica fume generally bagged transport, the density is very small, long-distance transport less efficient, multi-use artificial direct breaking of the oxygen-hydrogen compound reaction.

Silica fumes are supplied in the two forms for metal powder supplier: The former state silica fume and densified silica fume. The original gray-state micro-silica fume, through the dust collector products directly collected the loose volume of about 150-2 bags of silica fume into the concrete mixer and the working environment of dust, low efficiency. In order to solve the original gray-state micro-silica fume should not be long-distance transport and the problem of low efficiency, the development of encryption technology to improve the micro-silica fume loose density of silica fume. This technology enables the original gray-state micro-silica fume, scroll to gather a small group of particles in the compressed air flow under the action, which will loose volume of silica fume increased to 500-700 kg/m3, which greatly facilitates the use of encryption micro- silica fume small granule group particle cohesion is weak, in the concrete mixer in the mixing process is very easy to disperse the silica fume particles in the aggregate feeding into the mixer to ensure that the densified micro silicon particles group spread and good dispersion.

Higher SiO2 content, the higher the performance of silica fume, and other non-silica impurity content are low. Silica fume content> 85% carbon in the silica fume concrete containing adsorption part of the air-entraining agent, so the loss on ignition

by: anelwew

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