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工业磷酸三钠的主要用途是水处理药剂。动力锅炉(汽包炉)炉内添加磷酸三钠对炉水进行校正处理,是目前防止锅炉结垢的重要技术措施。水溶性钙盐是锅炉的主要结垢物质,它与磷酸三钠相遇一般情况下生成Ca_3(PO_4)2,它本身就是一种坚硬的水垢。但在高温高压的炉内且在适宜的碱性条件(pH=9～11)下,将按下式反应: 5Ca~(2+)+3PO_4~(3-)+OH~→Ca_5(OH)(PO_4)_3产物亦可写成[3Ca_3(PO_4)_2·Ca(OH)_2],叫做碱性磷灰石,它是一种松软的水渣,易随锅炉排污除去,故不致于造成结垢。工业磷酸三钠的质量检验,在化工部标准《HGl-322～78》中有明确规定。测试方法采用磷钼酸喹啉重量法,它比原标准《HGl-322-66》采用磷酸铵镁重量
The main use of industrial sodium phosphate is water treatment chemicals. Power boiler (drum boiler) add trisodium phosphate to the furnace water correction, is to prevent boiler scaling an important technical measure. Water-soluble calcium salt is the main fouling substance of the boiler, which meets with sodium trisodium to form Ca_3 (PO_4) 2, which is itself a kind of hard scale. But in the high temperature and pressure furnace and under the appropriate alkaline conditions (pH = 9 ~ 11), the reaction will be the following formula: 5Ca ~ (2 +) + 3PO_4 ~ (3 -) + OH ~ → Ca_5 (OH) (PO_4) _3 product can also be written as [3Ca_3 (PO_4) _2 · Ca (OH) _2], which is called alkaline apatite. It is a kind of soft water slag that is easy to be removed by boiler blowdown, . Industrial trisodium phosphate quality inspection, the Ministry of Chemical Industry standard “HGl-322 ~ 78” clearly defined. Test method using quinoline phosphomolybdate gravimetric method, which is more than the original standard “HGl-322-66” with ammonium magnesium phosphate weight