Pollution-free production process of plant fiber pulp

Abstract

The invention provides a pollution-free production process of plant fiber pulp. The method is characterized by obtaining the bleached fine pulp with concentration being 30-40% through coarse pulp preparation, defibrination treatment, desanding treatment, screening treatment, concentration and shoving treatment. The process has the following beneficial effects: the auxiliary has strong wetting and infiltrating functions, promotes the sodium hydroxide to rapidly wet the surface of the fibers and be infiltrated into the fibers with the reactive agent generated by hydrogen peroxide in the presence of the decomposing agent and ensures the chromophore in the lignin to be decomposed into low molecular colorless substances while the lignin is degraded and dissolved out; the stabilizing agent can complex and shield chromogenic metal ions and is characterized by reducing generation of the chromophoric groups, thus improving the whiteness of the pulp; under the action of the surfactant in the auxiliary, the dissolved lignin, colloid and the like can be uniformly dispersed in the water to be prevented from being adsorbed by the plant fibers again; and the pulp washing and bleaching procedures are omitted in the method, and at the same time, the waste water in the pulping process can be fully reused through simple treatment, thus not producing pulping back liquor causing serious pollution.

Description

technical field [0001] The invention belongs to papermaking and pulping technology, in particular to a pollution-free production process of plant fiber pulp. Background technique [0002] Pulp and papermaking is an industry that will never decline, and it is also a pillar industry of my country's national economy. However, the papermaking industry is one of the main industries that pollute the environment. Its total wastewater discharge ranks third in industrial wastewater. Therefore, the papermaking wastewater treatment technology It has always been a research hotspot in the paper industry and environmental protection circles at home and abroad. [0003] Although combustion alkali recovery is an effective method to solve cooking black liquor at present, the one-time investment is huge and the operation cost is high. In addition, the traditional alkali recovery technology not only burns the available organic matter in the black liquor, but also produces a large amount of har...

AI Technical Summary

Problems solved by technology

[0007] The common problem in the above-mentioned technical scheme is that the pulping process still needs to use chlorine-containing bleaching agent