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轮窑内燃焙烧红砖,有时出现“黑心”。这种“黑心”,大致可分为二类:一类为“欠火黑心”,呈灰黄色。产生的原因,是由于坯体内部温度不高,燃料不能完全燃烧,泥料中铁化合物受氧化作用极微(如温度低于690℃,泥料中低价铁就很难氧化成高价铁),故呈现与泥料颜色相似的“欠火黑心”。另一类为“过火黑心”,呈蓝色或蓝褐色。它比“欠火黑心”更为普遍。下面对此问题作比较详细的讨论,文中提到的“黑心”悉指正常情况下的“过火黑心”而言。
In the kiln firing roasting red brick, sometimes “black heart.” This kind of “black heart” can be roughly divided into two categories: one category is the “black heart” and it is gray-yellow. The reason is that the internal temperature of the blank is not high, and the fuel cannot be completely burned. The iron compound in the mud is oxidized very little (if the temperature is lower than 690°C, the low-priced iron in the mud will hardly be oxidized into high-priced iron). Therefore, the “black heart” is similar to the mud color. The other type is “over-fire black heart”, blue or blue-brown. It is more common than “black heart”. This issue is discussed in more detail below. The “black heart” mentioned in the text refers to the “over-heartedness” under normal circumstances.