輕燒鎂球、輕燒鎂粉等耐火材料 Refractory materials such as lightly burned magnesium balls and lightly burned magnesium powder

耐火材料種類繁多，例如輕燒鎂球、輕燒鎂粉等，通常按耐火度高低分為普通耐火材料（1580℃～1770℃）、高級耐火材（1770℃～2000℃）和特級耐火材料（2000℃以上）；按化學特性分為酸性耐火材料、中性耐火材料和堿性耐火材料。此外，還有用于特殊場合的耐火材料。  
　　現在對于耐火材料的定義，已經不僅僅取決于耐火度是否在1580℃以上了。目前耐火材料泛指應用于冶金、石化、水泥、陶瓷等生產設備內襯的無機非金屬材料。

There are many types of refractory materials, such as light-burned magnesium balls, light-burned magnesium powder, etc., usually divided into ordinary refractory materials (1580 ℃ ～ 1770 ℃), high-grade refractory materials (1770 ℃ ～ 2000 ℃), and special grade refractories ( Above 2000 ℃); According to chemical characteristics, it is divided into acid refractory, neutral refractory and alkaline refractory. In addition, there are refractories for special occasions.

The definition of refractory now depends not only on whether the refractory is above 1580 ℃. At present, refractory materials generally refer to inorganic non-metallic materials used in the lining of production equipment such as metallurgy, petrochemicals, cement, and ceramics.