论文部分内容阅读
业内人士认为,对环境危害较大的有害固体废弃物——碱渣和铬渣的综合利用前景看好。 碱渣是氨碱法生产纯碱过程中排放的废渣,生产1吨纯碱约排放10立方米的废液,其中含固渣500公斤,主要成分为氯化钙、氯化钠、碳酸钙和水。我国每年碱渣排放量为150万吨左右,大部分碱渣是堆存处理,不但要耗费巨资建渣场,而且由于碱渣碱性大,还会因雨水及其它因素造成周围土地碱化。如果碱渣废液排入大海,与海水混合时会产生次
Industry insiders believe that the prospects for the comprehensive utilization of harmful solid wastes such as alkaline slag and chromium slag, which are harmful to the environment, are promising. Soda ash is the waste residue discharged during the production of soda ash from ammonia-alkali production. The production of 1 tonne of soda ash wastes about 10 m3 of waste liquid, which contains 500 kilograms of solid residue. The main components are calcium chloride, sodium chloride, calcium carbonate and water. In China, the amount of alkali slag discharge is about 1.5 million tons per year. Most of the alkali slag is stored in a heap. Not only does it cost a huge amount of money to build a slag yard, but due to the alkalinity of the alkali slag, the surrounding land is also alkalized due to rainwater and other factors. . If alkali waste liquid is discharged into the sea, it will be generated when mixed with seawater