重钢3、4号高炉(620 m~3)分别在1980年和1987年大修停炉,破损调查发现,炉底的残砖几乎每块都装在一个“铅盒”内。炉底砖和耐热混凝土基础间的找平层全部被铅充填,冷却后形成一个厚约100 mm、直径9 m的大“铅饼”。在耐热混凝土基础中也渗入了不少铅。炉内的铅除部分随铁水带走外,大部分在炉内堆积,并沉积于风渣口水箱的间隙间,使水箱外表面变形,休风换水箱时铅液外 Heavy Steel No.3 and No.4 blast furnaces (620 m ~ 3) overhauled their furnaces in 1980 and 1987, respectively. A survey of damaged steel found that almost every piece of residual brick in the hearth was packed in a “lead box”. The screed between the furnace floor tile and the heat-resistant concrete foundation is all filled with lead and cools to form a large “lead cake” with a thickness of 100 mm and a diameter of 9 m. In heat-resistant concrete foundation also infiltrated a lot of lead. Most of the lead in the furnace is accumulated in the furnace with the molten iron removed, and deposited in the gap between the slag mouth and the water tank to deform the outer surface of the tank.