At present, there is a great controversy about the choice of refractory materials for white ash kiln. It is said that high-yield soft bricks are used, and there are high-aluminum bricks. It is said to use magnesium-aluminum spinel, and it is said to use phosphate composite bricks. Oh, there are also silicon bricks, there are many different opinions, then talk about this topic today... According to the material, the white ash kiln uses several refractory materials to choose several methods:
One is a high-load soft brick for the firing zone and a phosphate brick for the transition zone. His advantages are: phosphate brick wear-resistant and anti-scour, phosphoric acid combined with low-temperature sintered brick is the same as the basic and white ash raw material gas field, and the sintered white ash has good activity.
The other is a high-load soft brick for the firing zone and a high-aluminum brick for the transition zone. This kind of selection, high-aluminum bricks because of high purity, high temperature and corrosion resistance, another feature is that the cost of the series of bricks combined with phosphoric acid will be lower.
The third option is to use phosphate-composite composite bricks in the whole kiln, 2.8 or more composite bricks in the firing zone, and 2.6 or more composite bricks in the transition zone. But this cost will be higher than the previous two options.
The fourth option is to use magnesium-aluminum spinel bricks for firing, and phosphate bricks or silica bricks for the transition zone. The reason is that the raw material matrix for white ash is not as good as before, and the fuel is used to cause brick erosion. Aluminum spinel bricks have a relatively long life cycle. However, the cost is too high.At present, due to the increase in magnesia, the price of magnesium aluminate spinel bricks has risen too high.
The fifth option is to use silica bricks for firing, but there are not many bricks used at present, so don't make too many statements.
However, at present, there are also low-porosity bricks used in the research of the factory, which requires that the pores be below 10. However, there are not many used in the market, and low-porosity bricks are particularly resistant to corrosion.
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