마그네시아-알루미늄 스피넬의 기본 합성방법

마그네시아-알루미늄 스피넬 (MgAl2O4), 스피넬이라고도 불리는, 일반적으로 융점이 높은 중요한 무기 화합물입니다., 우수한 열 안정성, 기계적 강도와. It can be prepared through different synthetic methods, the following are some common ones:

Preparation of magnesium aluminum spinel

현재, spinel which can be used as a raw material for refractory materials must be obtained through a synthetic method. The main synthetic methods are sintering and electric fusion. The raw materials are high-purity alumina and chemical-grade magnesium oxide.

Preparation of spinel by sintering method

The advantage of the sintering method is that the process is a continuous ceramicization process, which can control the feeding speed and maintain a uniform temperature distribution in the kiln. 그러므로, the products produced are very homogeneous, with a grain size between 30-80 μm and a porosity. Lower (<3°%).

Preparation of spinel by electrofusion method

The electrofusion method is an intermittent operation process. The raw materials must be sorted and homogenized in advance before operation because if the raw material block is too large, the cooling time needs to be extended. At this time, the microstructure will be uneven during the cooling process, and If the cooling rate is too fast, the spinel crystal will be smaller on the outside than on the inside, and a large collection of low-melting-point impurities will accumulate in the center.

Characteristics of magnesium aluminum spinel

Magnesia-aluminum spinel has high slag corrosion resistance, 열 충격 저항, and high temperature and compressive strength. High-quality pre-synthesized spinel provides new raw materials for the production of amorphous and shaped high-purity refractory materials. 그러므로, Has been widely used.

Magnesia-aluminum spinel refractory castable

Magnesium-aluminum spinel-containing 다루기 힘든 캐스터블 are formulated from corundum, 마그네시아, 고알루미나 보크사이트, and synthetic magnesia-aluminum spinel aggregates and powders. Due to the existence and generation of spinel, expansion, and micro-cracks will occur, thereby buffering the thermal stress generated in the material. 그러므로, it has good resistance to slag erosion and thermal shock. 동시에, the spinel phase can wrap the periclase And improve the hydration resistance.