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How to choose a good magnesium olive sand!
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Release time：2024-10-23
1. magnesium olive sand is pure in color, uniform in color, and dark green is a good product.
There are many black solids or gas-liquid inclusions in 2. magnesium olive sand, which will affect the value of magnesium olive sand. Generally, magnesium olive sand containing impurities does not need to be used as a gem ring surface. So pay attention to whether the interior is uncracked and flawless, and the value of flawed magnesium olive sand is low.
3. choose magnesium olive sand with straight edges and perfect cutting rules.
4. large particles of magnesium olive sand is very rare, semi-finished magnesium olive sand is mostly below 3ct, 3ct-10ct is very rare, more than 10ct is very rare.
Because andalusite, sillimanite and kyanite phase change into mullite at high temperature, and mullite expansion coefficient is small, it is beneficial to improve the thermal shock resistance of the material. The addition of andalusite in the material can form numerous fine voids of thermal stress diffusion, so that the stress generated by expansion and contraction in the interior of the refractory material is released, thus improving the thermal shock resistance of the material. Sillimanite is completely mullite at a higher temperature, which is beneficial to improve the high temperature creep resistance of the product. In addition, the volume expansion effect accompanying mullitization is also beneficial to high temperature creep resistance.
It is pointed out that the creep resistance of andalusite brick is better than that of ordinary high alumina brick, corundum brick and most mullite brick. Therefore, the development and utilization of "three stones" to improve the microstructure and thermodynamic properties of aluminum-silicon refractory materials has a lot of application space.
The reuse of refractory materials has been emphasized in many international conferences on refractory materials, which is undoubtedly a common concern of refractory producers and users. In this regard, users and refractory suppliers have good prospects for cooperation. For example, the cooperation between Baosteel and the refractory plant will recycle the used magnesia-carbon bricks to produce the same standard magnesia-carbon bricks. At the same time, carbon-containing refractories can be used to produce slag formers for reuse in the metallurgical industry.
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