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我国各工业部门每年排放的工业废渣约5亿吨,其中粉煤灰4,500万吨、煤矸石16,000万吨、各种冶金废渣12,600万吨、炉渣7,400万吨、化工废渣1,440万吨。历年累计堆存量达53亿吨,占地89万亩,污染农田25万亩。每年向江河湖海排放1,500万吨。如何把这些工业废渣变为宝贵的资源?我们建材工业部门利用它来生产建筑材料做出了不少成绩。据统计,1984年我国工业废渣利用总量为1.3亿吨,占排
The annual industrial waste discharged by various industrial sectors in China is about 500 million tons, including 45 million tons of fly ash, 16 million tons of coal gangue, 126 million tons of metallurgical waste residue, 74 million tons of slag, and 14.4 million tons of chemical waste. Over the past year, the cumulative stockpiling capacity reached 5.3 billion tons, covering an area of 890,000 mu and polluting 250,000 mu of farmland. Every year, 15 million tons of water are discharged into rivers, lakes and seas. How do these industrial wastes become valuable resources? The building materials industry has made many achievements in using it to produce building materials. According to statistics, in 1984, the total amount of industrial waste residue in China was 130 million tons, accounting for