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The acids, alkalis and organic solvents used in the cleaning operation are cleaning agents in a broad sense. However, there are also some special or special cleaning agents in water treatment technology. They are usually a kind of surfactant, which are used to clean impurities such as water, sediment and floating rust on the metal surface. For example, sodium Dihexyl sulfosuccinate is one of the commonly used cleaning agents. It is an anionic surfactant. Some large-scale chemical fertilizer plants in China have used the mixture of organic phosphate and sodium polyacrylate as cleaning agent when there is a shortage of special cleaning agent, and achieved good results. The dosage is 80 ~ 100 μ G / g, pH is controlled at about 6.0 ~ 7.5, and the cleaning time is about 24h. From the hanging pieces of cooling tower pool and return pipeline bypass, most of the original corrosion products can be cleaned and reveal the true color of the metal. Organic phosphonate and polyacrylic acid are a composite corrosion and scale inhibitor, which has a good scale inhibition effect on calcium scale. Therefore, it is also effective to remove calcium scale in the cleaning of the device that has operated for a certain time. It is reported that the same application has been used abroad.

In addition, some domestic factories have also used sodium tripolyphosphate or sodium hexametaphosphate to replace special cleaning agents for cleaning. Because sodium tripolyphosphate itself has the function of dispersing cleaning, cleaning with them or combining cleaning with pre membrane will also have a certain effect.

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