Purification decolouring method of poly aluminium chloride solution used for paper making sizing precipitant and its technology

Abstract

This invention relates to a purification decoloration technique and process by ordinary aggregated alumina, the characters are: adding such as-reduced aluminum materials as aluminum crumbs to ordinary aggregated alumina solution, and heat it to a certain temperature. Through acid dissolution of alumina and the surface arrosion of metal aluminum, metal ion and organic impurities in oxidation reduction solution, the aim of purification and decoloration can be achieved, and its products can be used as precipitant in paper-making. The technique is simple, the decoloration speed is high, the efficiency is high, and it is easy to manipulate, the cost is low and can improve the qualities of aggregated alumina.

Description

technical field [0001] The invention relates to a purification and decolorization method and process of a common polyaluminum chloride flocculant, in particular to a decolorization method and process of a polyaluminum chloride used as a paper-making sizing precipitant. Background technique [0002] The traditional acidic papermaking process uses dispersed rosin size as the sizing agent and aluminum sulfate as the sizing precipitant. The paper produced has poor whiteness, easy yellowing, brittleness, short shelf life, poor sizing effect, and is difficult to produce high-grade paper. Paper. However, polyaluminum chloride is used instead of aluminum sulfate as the precipitant for paper sizing, which can be used for sizing under neutral conditions of pH 6.5 to 7.5. Good hardness, low yellowing value, high bursting strength, and calcium carbonate with high whiteness, small particle size and low price can be used as paper-making filler. At the same time, the use of polyaluminum ...

AI Technical Summary

Problems solved by technology

This process needs to add activated carbon, which increases the production cost, and the micro-electrolysis reaction is carried out at room temperature, the removal speed of heavy metals and organic matter is slow, and the reaction time is long

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