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Polyaluminum Chloride Dissolved In The Impurities Produced By The Reasons and Solutions

2023-11-14 15:57

    Polyaluminum chloride is a commonly used water treatment chemicals, is widely used in municipal water, industrial wastewater, domestic wastewater and other fields. The agent can effectively improve the water quality, remove suspended solids, organic matter, heavy metals and other pollutants, is an indispensable and important part of the water treatment project.

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    Polyaluminum chloride is a commonly used water treatment chemicals, is widely used in municipal water, industrial wastewater, domestic wastewater and other fields. The agent can effectively improve the water quality, remove suspended solids, organic matter, heavy metals and other pollutants, is an important and indispensable part of water treatment works. Why there will be magazines when polyaluminum chloride is dissolved?

    1. The presence of impurities: insufficient polyaluminum chloride content, low content polyaluminum chloride products contain some impure substances. To solve this problem, you can try to use a higher quality product, or check the purity of polyaluminum chloride before dissolving.

    2. Too high concentration: If the concentration of polyaluminum chloride is too high, it may lead to the formation of precipitates. In this case, try to reduce the concentration of polyaluminum chloride, such as reducing its dosage or diluting it.

    3. Temperature change: Temperature change may also lead to precipitates after dissolution of polyaluminum chloride. At high temperatures, polyaluminum chloride may dissolve more easily, while at low temperatures, precipitates may form more easily. Therefore, a stable temperature should be maintained when using polyaluminum chloride.

    4. Insufficient agitation: If insufficient agitation is used when dissolving polyaluminum chloride, it may result in the formation of precipitates. To solve this problem, try to increase the stirring time or use a more powerful stirrer.

    5. impurities in the water: if the water in which the polyaluminum chloride is dissolved contains impurities, it may also lead to the formation of precipitates. To solve this problem, try using a purer water source or filtering the water before dissolving.

    Production of raw materials such as aluminum ore, calcium aluminate powder and other raw materials of different origins, resulting in the production of liquid products are also very different, most of the raw materials produced in the liquid products are more insoluble, difficult to settle, not only affecting the appearance of the product, but also reduce the performance of the product, so usually the last step in the production of liquid polyaluminum chloride is to remove insoluble substances in it. There are two main methods for this:

    The first is the natural sedimentation method, which usually takes about 7-10 days, the production cycle is relatively long, affecting the output of the product, and is not suitable for some manufacturers with a small area, and for some products with high salinity, the insoluble matter is difficult to be separated due to the relatively high viscosity of the product, even if it is precipitated for several days, it still can't meet the relevant requirements in the national standards;

    Another method is to use plate and frame filter press to press filtration, which is not only a big investment and power consumption, but also requires that the salinity of the product can not be too high (generally below 80%), which limits the scope of application of the product.

    Polyacrylamide can be used as coagulant aid to remove insoluble matter in polyaluminum chloride:

    Polyacrylamide is a widely used organic polymer flocculant, generally used as a coagulant aid, in the coagulation process, through the charge neutralization and adsorption bridging effect to increase the particle size of the floc, to accelerate its settlement and thus improve the coagulation effect. The use of polyacrylamide and other organic polymer flocculants is a way to accelerate the precipitation of insoluble materials in polyaluminum chloride. But the effect of ordinary polyacrylamide in accelerating the precipitation of insoluble matter in polyaluminum chloride is not obvious. There have been reports on the application of polyacrylamide in the preparation of liquid polyaluminum chloride, but there is no large-scale input. The effect of modified polyacrylamide on the settling speed of insoluble matter in liquid polyaluminum chloride and its coagulation performance provides a practical and effective solution to the problems commonly encountered in the actual production process of liquid polyaluminum chloride.