我国许多城市都有大量工业和民用锅炉,其中链条炉和篦式炉占的比重较大。它们排出的煤渣如果集中起来用作小型空心砌块的骨料,不但能使这些废渣得到处理,而且为城市建设提供了性能良好的墙体材料。一般情况下,这种小砌块的生产成本都低于当地的粘土砖。 Many cities in China have a large number of industrial and civilian boilers, of which the proportion of chain furnaces and retort furnaces is relatively large. If the coal cinder they remove is used as aggregates for small hollow blocks, not only can these waste residues be treated, but they also provide good wall materials for urban construction. In general, the production costs of such small blocks are lower than the local clay bricks.