Elemental chlorine free bleaching method for plant fiber stuff
A plant fiber and elemental chlorine technology, applied in pulp bleaching and other directions, to reduce environmental pollution, reduce pollution, and improve pulp strength
Active Publication Date: 2010-08-25
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology
CN1065578C only found the final bleaching section suitable for chemical wood pulp, and did not involve the bleaching of straw pulp
Method used
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Abstract
The invention relates to an elemental chlorine free bleaching method. In the method, dioxin and AOX are removed from the source by adopting D section bleaching and P section bleaching. The straw pulp is bleached by adopting the elemental chlorine free bleaching method, so that the problem that wastewater obtained by bleaching by the chlorine-containing bleaching method is most severely polluted is solved; and the bleaching process is simple and practicable. Each index of the bleached stuff can be compared with that of broadleaf wood pulp.
Description
technical field The invention relates to a method for bleaching pulp, in particular to a method for bleaching plant fiber pulp without elemental chlorine. Background technique The development of my country's pulp bleaching technology is slow, especially the straw pulp bleaching technology still uses chlorine and hypochlorite bleaching. It has been proved that this kind of bleaching wastewater contains a series of organic halides including dioxin and AOX, which will cause great harm to human health and the environment. The pollution caused by chlorine bleaching is quite serious, which is far from meeting the requirements Environmental Protection Requirements for Limiting the Discharge of Organic Halides in Bleaching Wastewater. At present, the use of chlorine bleaching methods has been expressly banned internationally. Therefore, it is imminent to find a chlorine-free bleaching method suitable for straw pulp as soon as possible. CN1940176A discloses a two-stage bleaching ...
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Inventor 李洪法宋明信毕衍金赵淑晶阎俊钦金艳彬
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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