Powdery high-whiteness polyaluminium chloride complex and preparation method thereof

Abstract

The invention discloses a powdery high-whiteness polyaluminium chloride complex and a preparation method thereof. The mass content of alumina is 28 to 30 percent, the mass content of acrylic amide-dimethyldiallylammoniumchloride copolymer is 1 to 5 percent, the alkalinity is 55 to 85 percent, the whiteness is 80 to 90 percent, the mass content of water-insoluble substance is 0.5 to 1.5 percent, and the mass content of iron ions is less than 0.01 percent. When the complex is used for papermaking white water treatment, the complex controls fin fiber, filler and gooey and the like in the papermaking white water with small using amount and low using cost; when the complex is used for treating the papermaking white water, the sediment floccule is recycled for papermaking and the adding amount of the sediment floccule in papermaking reaches 5 percent, the whiteness of the formed paper is still not reduced; when the complex is added into the papermaking pulp, the complex has strong charge neutralization capability for pulp fiber, and can obviously improve the retention rate of the fiber and the inorganic filler and reduce the turbidity of the papermaking white water; when the using amount of the complex reaches 3 percent, the whiteness of the formed paper is still not reduced; and when newspaper is manufactured by de-inking, bleaching and pulping waste paper and the white water is recycled, the complex can improve the whiteness of the formed paper.

Description

technical field [0001] The invention relates to a composite of an inorganic aluminum salt water purifying agent and a water-soluble organic cationic polymer copolymer and a preparation method thereof, especially powdery polyaluminum chloride and acrylamide-dimethyl diallyl ammonium chloride Copolymer composite preparation method. technical background [0002] On the one hand, the paper industry is developing in the direction of "four highs" (high quality, high production capacity, high efficiency and high speed), and on the other hand, it is facing the challenges of "two severe" situations (shortage of raw materials and higher requirements for environmental protection) . Paper mills have to increase the amount of secondary fiber and reduce the amount of water discharged, making the water system in the paper production process more closed, and the white water of papermaking contains more pollutants. Pollutants in papermaking white water are mainly fine fibers, hydrolyzed si...

AI Technical Summary

Problems solved by technology

[0004] Compared with organic cationic additives, polyaluminum chloride, an inorganic polymer flocculant, has many advantages in the paper industry, such as: aluminum ions in polyaluminum chloride, in addition to having a higher positive charge, and negative charge In addition to the fact that the fibers are easy to combine, the aluminum hydrate ion with a relatively high positive charge can also perform a complex reaction with the hydroxyl groups in the fiber. In addition, the production cost and use cost of inorganic polyaluminium chloride are relatively low, which is very good Papermaking retention aids, but due to some defects, such as polyaluminum chloride with high salinity, the color is dark, so it cannot be used in the production process of white paper, and high-purity polyaluminum chloride, although the whiteness has a certain degree increase, but its basicity is relatively low, and its flocculation and bridging ability is very poor. The small dosage cannot meet the flocculation requirements. If the dosage is too large, it will not only increase the cost, but also reduce the whiteness of white paper. Therefore, the development of high whiteness and high flocculation The new polyaluminum chloride and its composite products with the ability are worthy of in-depth research

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