The quality and grade of high-alumina bricks can be identified from multiple aspects, mainly including color, flatness, surface quality, etc. The following is a detailed identification method:

· Color: The color of high-alumina bricks is related to their alumina content, and the color is usually white, but the specific color may vary due to factors such as temperature control and raw material ratio during the production process.

· Flatness: The surface of high-alumina bricks should be flat, without obvious bending, warping or unevenness. Bricks with uneven surfaces will increase the difficulty of construction during masonry, affecting the appearance quality and service life of the furnace lining.

· Surface quality: Observe whether the surface of high-alumina bricks is smooth, whether there are black spots or large areas of burnt materials.

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· Size: High-alumina bricks have regular sizes, small side length errors, and are usually within the allowable tolerance range. If the size deviation is large, it may affect the quality of masonry, resulting in uneven brick joints and reducing the overall strength and sealing of the furnace lining.

· Cracks and defects: Check whether there are defects such as cracks, pores, and inclusions on the surface and inside of high-alumina bricks. For bricks with slight cracks on the surface, you can use a hammer to tap gently and listen to the sound to judge the depth and severity of the cracks.

· Sound: Use two bricks to hit, and the sound of high-quality high-alumina bricks is crisp and not dull.

· Volume density: Volume density is one of the important indicators of high-alumina brick quality. Generally speaking, the higher the volume density, the better the strength and refractory performance of the brick.

· Alumina content: The main component of high-alumina bricks is alumina. The higher the alumina content, the better the refractory performance of the brick.