Chemicals and stabilizing factors determining the formation of drinking water grade polyaluminium chloride
drinking water grade polyaluminium chlorideIs a variety of chemical substances by high temperature and high pressure reaction polymerization refined from the electrolyte, can effectively and quickly reduce the water multi-negatively charged colloidal charge.
drinking water grade polyaluminium chlorideFeatures:
1. Large molecular weight, strong adsorption capacity, large floc formation, and high flocculation settlement.
2. The degree of polymerization is fast, and it is stirred quickly after addition, thus saving flocculation time.
3. The temperature effect is not obvious, even if the water temperature is low, it will not affect the use effect, and the low temperature use effect is very good.
4. of waterPHThe value decrease is small and is used in the medium range.
5. The amount of addition used is small, and the amount of sludge formed by its products is small, which is particularly convenient for management and operation.
6. Drinking water grade polyaluminum chloride is less corrosive to equipment and pipelines.
Therefore,drinking water grade polyaluminium chlorideAluminum sulfate can be gradually replaced in the field of water treatment, but its disadvantage is that the price is higher.
Decisiondrinking water grade polyaluminium chloridePerformance factors:
1. Aluminum oxide content: The density of the flocculant product determines the content. The higher the density of the flocculant product, the higher the content.
2. Inorganic salt: In order to improve the stability and coagulation ability of drinking water grade polyaluminum chloride, inorganic salts (suchCaCl2,MnCl2etc.) or high molecular weight (such as polyvinyl alcohol, polyacrylamide, etc.). added during use.
3. Alkalization degree: the higher the alkalization degree of drinking water grade polyaluminum chloride, the stronger its adsorption bridging ability, close[Al（OH）3]nEasy to produce precipitation, so the stability is poor. Because drinking water grade polyaluminium chloride isAlCl3stepwise hydrolytic conversionAl（OH）3A chemical formed in a process in which the degree of hydroxylation is the degree of alkalinity, which is the ratio of hydroxyl equivalents to aluminum equivalents in polyaluminum chloride.
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