一、前言 我厂三座255立方米高炉生产锰铁,采用重力除尘和旋风除尘去除煤气中的粗灰尘。此粗灰尘统称瓦斯灰。我厂自生产锰铁以来,共产瓦斯灰约40万吨。这些瓦斯灰,1979年前,大部份倒在八宝桥等铁路沿线,1979 I. Introduction I plant three 255 cubic meters blast furnace production of ferromanganese, the use of gravity dust and cyclone dust removal of coarse dust in the gas. This coarse dust collectively referred to as gray ash. Since our plant produces ferromanganese, the total output of ash is about 400,000 tons. Most of these gas ash fell before the railway such as Babaoqiao in 1979, 1979