Explanation

Clay is a soil like mixture, mainly composed of clay mineral, with a particle size of less than 0.002mm. They can be formed by exogenous sedimentation, long-term weathering of the parent rock, or the influence of hydrothermal alteration. Common clay minerals include kaolinite, montmorillonite, hydromica, as well as palygorskite, sepiolite, rectorite, etc. In addition, clay may also contain a small amount of quartze, feldspar, mica and other mineral fragments, as well as tectonic minerals such as siderite and gypsum. Clay has a variety of properties, including cohesiveness, plasticity, adsorption, expansion, fire resistance and sintering. According to plasticity, clay can be divided into plastic clay (soft clay), semi soft clay and flint clay. According to refractoriness, they can be divided into refractory clay (refractoriness is greater than 1580 ° C), fusible clay (refractoriness is less than 1350 ° C) and refractory clay (refractoriness is 1350 ° C to 1580 ° C). According to the origin, clay can be divided into hydrothermal altered clay, weathered residual clay (residual clay) and sedimentary clay. According to mineral composition, they can be divided into kaolinite clay, montmorillonite clay, hydromica clay, palygorskite clay, sepiolhe clay, clay, etc. According to the use or characteristics, they can be divided into refractory clay, ceramic clay, haydite day, brick and tile clay, bentonite, etc. Clay is widely used in various fields, including architecture, ceramics manufacturing, pottery, brick and tile manufacturing, soil improvement, geological engineering, oil field exploitation, etc. Their diversity and characteristics make them important natural resources.

Classification