Customer in Malaysia ordered 4*20GP containers refractory high alumina bricks
In December. 4*20 GP containers high alumina bricks are packed for delivering to customer in Malaysia. High quality nice price refractory fire bricks in Topower Refractory.
To identify the quality and grade of high alumina bricks, it can be identified from three aspects: appearance, body density and testing.
First of all, identify it from the appearance color: if the color of the high alumina brick is yellow, it is a third-grade high-alumina brick. If the color is yellowish-white, it proves that it is a second-grade high-alumina brick. brick. If the appearance of these three colors is not smooth or there is no crystal phase, it means that the sintering temperature is low and the strength is not good when used.
In addition, it depends on whether there are black spots or large areas of burnt materials on the surface of high alumina bricks. If there are black spots, it is because the iron content of the raw materials is too high, and karst holes will appear during use, which will affect the service life. It also depends on whether the surface of the high-alumina brick is smooth. If the surface is not smooth, it is because the outriggers were fired during sintering, and there are large bricks pressed on it, resulting in uneven surface. This also affects the staggered layer during masonry, and will also affect the service life in the later period of use.
The next step is to look at the size. The size should be measured with a ruler. If the length, width, and thickness of the high-alumina brick are greater than 2mm, it means that the mold scale is too large, and it may also be the reason for the raw material. above. High alumina bricks of this size cannot be used.
The quality of high-alumina bricks can also be seen from the bulk density. The test method is to weigh the weight of a single brick with an electronic scale, and then measure the length, width, height or size of the high-alumina brick, and then calculate Volume, divided by weight by volume, is the specific gravity of high alumina bricks. If the specific gravity is lower than 2.3, it proves to be a third-grade high-alumina brick. If the bulk density is greater than 2.3, it is a second-grade high-alumina brick. If the bulk density is above 2.45 , that is the first grade high alumina brick.
The aluminum content of refractory bricks, if the aluminum content is 55%, is the third-grade high-alumina brick, if it is 65%, it is the second-grade high-alumina brick, if it is 75%, it is the first-grade high-alumina brick, but the aluminum content is To know through chemical tests. It cannot be seen directly.
In addition, the strength, thermal shock, and reburning line changes of refractory bricks can only be known through physical and chemical processes, which cannot be seen with the naked eye.
The load softening temperature of refractory bricks is also the most important item in the use process. There are two ways to identify this. One is to look at the sintering temperature of high-alumina bricks. If the sintering temperature is 1380, then the load is around 1400. If the sintering temperature It is 1450, then the load temperature is around 1480. However, if the load softening temperature is to be more accurate, it must be tested.
In general, the quality of high alumina bricks is judged from three intuitive methods: color, size shrinkage, and body density. Of course, if the user requires other indicators, it must be tested to find out.
