轻烧镁球、轻烧镁粉等耐火材料 Refractory materials such as lightly burned magnesium balls and lightly burned magnesium powder

耐火材料种类繁多，例如轻烧镁球、轻烧镁粉等，通常按耐火度高低分为普通耐火材料（1580℃～1770℃）、高级耐火材（1770℃～2000℃）和特级耐火材料（2000℃以上）；按化学特性分为酸性耐火材料、中性耐火材料和碱性耐火材料。此外，还有用于特殊场合的耐火材料。  
　　现在对于耐火材料的定义，已经不仅仅取决于耐火度是否在1580℃以上了。目前耐火材料泛指应用于冶金、石化、水泥、陶瓷等生产设备内衬的无机非金属材料。

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.