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在地下水、地表水、河水、湖水等原水中，通過進入鍋爐使用加熱循環過程中，就會有碳酸鈣產生，呈松軟海綿狀，遇鹽酸泡沸溶解；這種垢里面鈣鎂的含量占98%，所以也叫鈣鎂垢；是較原始的、也是一次性水垢；在鍋爐循環用水中，水需要處理后循環利用，循環多次的水就會存在雜質多、細菌多、酸堿不平衡、各種腐蝕性強的特點；為了改善這種狀況，讓水達標，往往給水添加眾多藥劑；為了防腐加入聚磷酸鈉，為了絮凝沉淀加聚硅酸絮凝劑，為了防止溶解氧過多加亞硫酸鹽，這些加入的鹽類和已經形成的鈣鎂垢結合在一起，加上設備的腐蝕產物，遇到高溫就會形成一種更堅硬的、各種顏色的水垢，較難處理；這種垢就是二次水垢。海揚磁水商務部0536-8970809