Classification of refractory clay
Refractory clay refers to clays with a refractoriness greater than 1580°C that can be used as refractory materials and bauxite used as refractory materials. In addition to their high refractoriness, they can maintain volume stability under high temperature conditions, and have slag resistance, resistance to rapid cooling and rapid heating, and certain mechanical strength, so they are extremely firm after calcination. Refractory clay is mainly used in the metallurgical industry as a raw material for the production of shaped refractories (bricks of various specifications) and unshaped refractories, and the amount accounts for about 70% of all refractories.
Refractory clay is divided into four types: soft clay, semi-soft clay, hard clay and high alumina clay according to plasticity, mineral characteristics and industrial use. Soft clay is generally soil-like, easily dispersible in water, and can form plastic mud mass after mixing with liquid; semi-soft clay has poor dispersibility, and its dispersing part can also form plastic mud mass after mixing with liquid . These two kinds of clay are often used as binders when making refractory products. Hard clay is often in block or plate shape, generally does not disperse in water, and has high refractoriness. It is the main raw material for refractory products. High alumina clay has high content of Al2O3, high hardness and specific gravity, and high refractoriness. It is often used to manufacture advanced clay products.
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