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在地下水、地表水、河水、湖水等原水中，通过进入锅炉使用加热循环过程中，就会有碳酸钙产生，呈松软海绵状，遇盐酸泡沸溶解；这种垢里面钙镁的含量占98%，所以也叫钙镁垢；是原始的、也是一次性水垢；在锅炉循环用水中，水需要处理后循环利用，循环多次的水就会存在杂质多、细菌多、酸碱不平衡、各种腐蚀性强的特点；为了改善这种状况，让水达标，往往给水添加众多药剂；为了防腐加入聚磷酸钠，为了絮凝沉淀加聚硅酸絮凝剂，为了防止溶解氧过多加亚硫酸盐，这些加入的盐类和已经形成的钙镁垢结合在一起，加上设备的腐蚀产物，遇到高温就会形成一种更坚硬的、各种颜色的水垢，较难处理；这种垢就是二次水垢。海扬磁水商务部0536-8970809