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    Fabrication of Bone China

    The formation of bone porcelain mainly depends on silica, alumina and calcium oxide. The higher the content of calcium oxide, the better the color. In nature, there are few sources of calcium oxide, so animal bone meal is selected as the source of calcium oxide.

     
    In fact, the so-called Bone China is a bone china product made of herbivore bone ash (mainly Ca3 (PO4) 2) as raw material, mixed with high-quality kaolin, quartz and other auxiliary materials, and glazed at 1280 ℃. Generally speaking, 25% bone powder is added to the raw material, which can be called Bone China, but the best Bone China recognized in the world today is 45% - 51% bone powder, and cow bone is preferred.
     
    The production process includes grouting, molding embryo making, gypsum mold dehydration, initial firing, glaze firing, decal paper baking and other processes. After firing at high temperature, it becomes a porcelain with high whiteness, high transparency and fine porcelain. In the firing process, bone porcelain has high requirements for its regularity, whiteness, transparency, thermal stability and other physical and chemical indexes, resulting in a high scrap rate It is used for exquisite materials, fine production and strict standards, so its value is higher than that of other ceramics.