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olyacrylamide is called "Baiye Auxiliary Agent", not only in the common industrial sewage treatment process, but also in the field of building pile shield mud. When building piles or shield tunnels in cities, adding polymers can effectively protect the walls and prevent collapse accidents, so that construction projects can proceed normally. However, there was no place to discharge the mud in the midsummer after the mud was recycled. In the past, many construction sites dug a pond and waited for the mud to sink to the bottom naturally. This traditional natural settlement takes time and effort. Now, The construction site can separate mud and water by using polyacrylamide to accelerate the sedimentation of mud, save time and effort in environmental protection.

The construction of pile driving shield mud needs the Polyacrylamide for construction mud to achieve the effect of mud removal when separating mud and water. Then, we know that polyacrylamide can be divided into cationic, anionic and nonionic types according to the ionic characteristics. There are three or four types, there are six types of cations, and one type of non-ion. Which model is effective?

The consistency of the piling mud is very large, which requires that the polyacrylamide agent used has a particularly good dispersion property in the mud. It must be fully fused and mixed with the mud to achieve the state of flocculation and agglomeration, and the mud at the construction site The output is very large, and it must meet the construction requirements on site. This makes it necessary for the user to choose a non-ionic Polyacrylamide for construction mud or anionic polypropylene with high molecular weight when choosing a flocculant, and can quickly and uniformly merge with the mud Amide. Which model to use depends on the actual application and debugging on site.

In recent years, most of these process systems have adopted mud collection tanks, coagulation tanks, clear liquid tanks, sediment separation systems, dosing systems, drainage systems, and slag discharge systems.

Its working principle is: the mud is collected into the hand sedimentation tank through the pipeline, and pretreated by the mud dehydrator to remove most of the fine sand and part of the mud in the mud water, and the filtrate enters the secondary settling tank through the drainage system. The second settling tank must be treated with flocculant. After the mud water is processed by the dehydrator, the water in the clearing tank can be directly returned to the system, and zero discharge is truly achieved. When the sludge concentration is high, the slurry dehydration treatment is directly carried out. Generally, a coagulant needs to be added to improve the sludge drainage and ensure that the polyacrylamide has sufficient dispersion in the slurry, which can improve the flocculation sedimentation effect and promote better Slurry separation.

In the infrastructure construction, anionic polyacrylamide or cation should be selected according to the characteristics of the mud. The mud in different regions should be selected for small-scale experiments to select polyacrylamide products suitable for the customer's site. According to our long-term experiment summary, most construction mud treatment uses anionic polyacrylamide flocculant, the degree of hydrolysis is between 25-40%, the mud flocculation treatment effect is better.

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