Control of indicators for insoluble substances in polyaluminum chloride water analysis

        The water insoluble substances in Polyaluminum Chloride liquid are relatively large, which can cause a large amount of solid impurities in Polymeric Aluminium Chloride and a decrease in content. This not only affects the appearance of the product, but also has a certain degree of impact on its performance, pipeline corrosion and blockage. In addition, relevant national standards have strict regulations on the insoluble substance content of products of different grades, with liquid first-class products being less than 0.2% and liquid first-class products being less than 0.5%. It can be seen that, The water insoluble substance in polyaluminum chloride is a very important indicator.

In order for various manufacturers to achieve the target of water insoluble substances in Polymeric Aluminium Chloride , the next step in producing liquid polyaluminum chloride is usually to remove the insoluble substances. There are mainly two methods:

One method is the natural sedimentation method, which usually takes about 7-10 days and has a long production cycle, affecting the output of products. It is not suitable for manufacturers with small factory areas. Moreover, for some products with high alkalinity, due to the high viscosity of the products, insoluble substances are difficult to separate, and even after several days of sedimentation, they cannot meet relevant regulations. The color of the polyaluminum chloride produced by this natural sedimentation method is very dark and turbid, and the content generally does not exceed 29%, Dissolve and mix the colors of the liquid.

Another method is to use a plate and frame filter press for filtration. Plate and frame Polyaluminum Chloride is a widely used method nowadays. The solid color of the produced polyaluminum chloride is bright yellow, and the insoluble substances in water are low. During use, there is little residue generated, which is not suitable for corrosion of pipelines and greatly reduces the labor intensity of workers. Therefore, plate and frame polyaluminum chloride is very popular among customers. It is also the type of polyaluminum chloride with the largest market share in the future.

Although the plate and frame type Polymeric Aluminium Chloride has low water insoluble substances, it needs a large investment and high power consumption. The filter cloth used in the plate and frame during filtration is easily damaged after strong pressure filtration. A batch of filter cloth is changed about a week. Therefore, for most manufacturers, in order to reduce equipment investment, they mostly use natural sedimentation method. However, the water insoluble substances produced by them are difficult to meet the standards. The cost of polyaluminum chloride produced by natural sedimentation method is definitely much lower. This is one of the reasons why the price difference of polyaluminum chloride with the same content can be so much.

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