Shield technology is often used in urban subway engineering. In the process of balanced shield construction, additives such as foaming agents and stabilizers are added to reduce the wear of the shield machine and reduce the internal friction of muck cutting. The water separated by the shield needs to be recycled. The use of additives brings troubles to the sand cleaning and separation stage of the shield, but this also causes a large amount of foam in the water separated from the sand cleaning, which will affect the water. recycle. This requires the use of mud cleaning defoamer for defoaming.
(Picture: Shield method construction)
Shield cleaning and separation foam problem
The mud-water cleaning and separation system in the shield construction field is an important guarantee for the normal tunneling of the shield machine. The operation process is generally divided into three stages:
1. Feeding stage: transport the sand that needs to be separated to the feeding port and then to the next stage.
2. Sediment cleaning stage: the circulating water washes and filters the sediment, and the separated clean sand is transported to the finished product warehouse. During the cleaning process, due to the addition of additives during the construction process, the silt is prone to foam in a large amount during cleaning, the precipitated muddy water will have a large amount of foam, and the precipitated muddy water will enter the mud-water separation stage.
3. Mud-water separation stage: Separate the muddy-water sedimented in the sediment cleaning stage. During the separation process, flocculants and separating agents will be added for pressure drying. Foam will affect the separation of mud and water, and the separated water is transported to the mud cleaning stage for use. Therefore, it is necessary to defoam the mud-water separation foam.
(Picture: Foam problem in mud-water separation)
Nanhui Mud Cleaning Defoamer——Professional solution to cleaning foam
Subway shield construction is often used in large-scale projects. During the separation of sediment and sand in the shield, it is easy to cause foaming problems due to construction characteristics and other reasons. Foam will affect the normal operation of mud and water separation, and the separated water will seriously affect recycling. , It will have a very negative impact on the entire construction progress. The water after mud-water separation can be treated by adding flocculants, defoamers, etc., mud-water separation foam and foam problems in water treatment are recommended by Nanhui chemical additives manufacturers Mud cleaning defoamer controls foam.
(Picture: Sample of Nanhui Mud Cleaning Defoamer)
Guangdong Nanhui chemical additives manufacturers specialize in the development and production of defoamers, thickeners, flocculants, dispersants, etc. In response to the foam problem encountered in the underground subway shield project, Nanhui manufacturer has developed a mud cleaning defoamer to eliminate the foam problem in the sediment separation system. It has good defoaming and anti-foaming effects. The product features are as follows:
1. Professional manufacturers have R&D and production, strong strength, perfect formula, and guaranteed after-sales service;
2. The formula concentration of defoamer is high, and the amount of addition is small, which can control the cost of defoaming;
3. The quality of the raw materials in the defoaming formula is good. After professional configuration, the defoaming is fast and the foam suppression time is long.
4. It is researched and developed for the subway shield construction scene. The defoaming is highly targeted, which can solve the foam problem of the sediment cleaning system and prevent the foam from affecting the sand cleaning and mud-water separation. The water separated after defoaming is convenient for recycling.
