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日本电力工业中心研究成功用火力发电厂的煤灰制成新的颗粒肥料,方法是在氮肥、钾肥原料中加入磷酸溶液,再加进
Japan Electric Power Industry Center successfully used coal ash from thermal power plants to make new granular fertilizers by adding phosphoric acid solution to nitrogenous and potash raw materials and adding