石家庄有7家热电厂、化肥厂等大中型企业，每年排放煤灰和工业渣160万吨。1990年以前，只有市建材二厂一家生产粉煤灰蒸压加气砼砌块，年生产5万m3左右，产品主要销往北京、天津、青岛等地，本市用量不大。后有一集体性质的砼制品厂兼营生产空心砌块，销路一直未曾打开。1991年 Shijiazhuang has seven large- and medium-sized enterprises, such as thermal power plants and fertilizer plants, and emits 1.6 million tons of coal ash and industrial slag each year. Before 1990, only a building material plant No. 2 produced fly ash autoclaved aerated concrete blocks with an annual production of 50,000 m3. The products were mainly sold to Beijing, Tianjin, and Qingdao. Afterwards, there was a collective product of glutinous rice products that produced hollow blocks, which had never been opened. year 1991