Mobility of silica fume is related with silicon content, but it is out of the proportion. For the same kind of silica fumes, some have good liquidity, while some simply do not have the liquidity.
For testing, the dispersant must be added. If trimeric sodium phosphate does not work, P530 is available. If both of them do not work, the silicon powder can not be used in the refractory industry.
Simple approach can be used without encryption silica fume, 40 g water, 60 g of silica fume and 0.2 g of dispersant (trimeric or P530). Stir dumping the glass, the natural flow, measuring flow area, if the average diameter greater than 150mm while liquidity is generally good, it is best to try to amorphous specimen test, the final judgment according to the amount of water mobility is good or bad. China's micro-silica fume rarely meets this standard. For the encryption of silica fume, can not use the above method only with the amorphous sample to be determined.
Amorphous specimen, the mobility of the detection of micro-silica fume, can easily determine a ratio, such as bauxite aggregate and powder can be used the following proportions: 5-3MM 40% of the bauxite aggregate, 3-1MM 13 %, 1-0MM 15%, 20% of 180 mesh alumina powder, aluminum cement 7%, 5% of silica fume, trimeric 0.15% or trimetric 0.07% six partial 0.05%.
Will be a good raw material weighing, add the dry mix in the mortar mixer, then stir adding 6% water, and then stirred for three minutes, look at the consistency of the mixture. If a more dilute, liquidity is good, and then proves that the quality of silica fumes. Such as flow, can appropriate to add a little water to determine the water demand how much. But mere experience judgment for accurate, you need to choose a better mobility of boron powder determine a standard amount of water. Mixing cement mortar fluidity tester determination of gravity and beat 15 times flow value, the value of the standard flow value. Determination of other kinds of silica fume, look to reach the water requirement of the standard current value, you can determine the good or bad flow of silica fume.
Bauxite aggregate and fine necessary should have a good selection for sintering. And each experiment is better to use the same batch. It is better to use new open package and stable quality cement when doing the aluminum cement experiments. There are differences in mobility in different seasons. Using castable specimen can accurate determine silica fume’s fluidity, strength, hardening time, contraction and other physical properties, but it is more trouble. And it can only be measured in the laboratory. There are almost no silicon plants in China with these experimental devices. If the production site needs to determine quality of the silica fume, a simple method should be found.Source:http://www.mhcmp.com
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