“综合利用问题要好好研究,这是今后发展的一个重要方向。”北京煤建公司在北京建材研究所的配合下,大搞群众运动,千方百计变“废”为宝。在蜂窝煤和煤球中掺入一定量的石屑,既保证了民用又烧制成功抗压强度为250～300公斤/厘米~2的炉灰水泥,现在已经在北京市试点推广。一、原材料、配比及工艺过程 “The issue of comprehensive utilization must be well studied. This is an important direction for future development.” With the cooperation of the Beijing Institute of Building Materials, Beijing Coal Construction Co., Ltd. has engaged in mass movements and has done everything possible to turn waste into treasure. The addition of a certain amount of stone chips in the coal briquettes and briquettes not only ensures that the civil and fired ash cements with a compressive strength of 250-300 kg/cm2 can be successfully promoted in Beijing. First, raw materials, ratio and process