We all know that the effectiveness of polyaluminum chloride is closely and directly related to its active ingredient, alumina. The content of alumina varies from 20% to 30%, so we need to test its purity, which means we need to know the content to have an understanding of the quality.
At present, when we use polyaluminum chloride to detect its content, we generally adopt the standard practice of *, which is to dissolve the product sample, then add acid. Under the action of acid, polyaluminum will be degraded, and then zinc chloride will be added for titration. After analyzing the ions in the sample, relevant usage data will be obtained, and the content of the product can be calculated based on the data. However, as it is a manual experiment, there may be some deviation in the calculation, but this deviation cannot exceed 0.1% for liquid products and 0.2% for solid products. Therefore, when purchasing, there may be situations where the purity is insufficient, but anything within the deviation range is considered normal and there is no need to worry too much about purity issues.
What should be noted when using polyaluminum chloride products? Do not add directly before use. It is better to determine the usage model and dosage according to the different raw water, because this is an inorganic polymer compound that is easily soluble in water but has certain products. Therefore, the dosage can be determined through experiments based on the quality of the raw water. When choosing, in order to facilitate transportation and storage, most people choose solid products for use. Before use, they must dissolve them thoroughly. When dissolving, they can be mixed and dissolved in a ratio of solid: water=1:5, and then diluted with water. Generally, if the concentration is below 1%, hydrolysis is likely to occur, which will reduce the effectiveness of the product. If the concentration of the product is too high, it is easy to cause waste.
It should be noted that when using, it is better to prepare the liquid into a 5-10% aqueous solution, and adjustments should be made at any time during use. If the alum in the sedimentation tank is small and the turbidity is high, it is due to insufficient dosage. If the alum is large and flips up, it is often due to excessive dosage, and timely adjustments are needed to ensure the effectiveness of use.
