Method for improving utilization rate of P-RC-APMP (pre-treatment alkaline hydrogen peroxide mechanical pulp) process pulping and bleaching filter liquid

Abstract

The invention relates to the field of chemomechanical process pulping, belongs to improvement on a P-RC-APMP (pre-treatment alkaline hydrogen peroxide mechanical pulp) pumping process, and particularly relates to a method for improving the utilization rate of P-RC-APMP process pulping and bleaching filter liquid. The P-RC-APMP process pumping comprises the following steps that wood sheets sequentially pass through a steam steamer, a 1# extrusion spiral device, a 1# pre-soaking reaction cabin, a 2# extrusion spiral device and a 2# pre-soaking reaction cabin to obtain pulp; the pulp passes through a 1# main mill, a medium concentration bleaching tower, a 1# extrusion spiral device, a high concentration bleaching tower, a 2# extrusion spiral device, a 2# main mill, a staying tower and a 3# extrusion spiral device, in one step, also passes through a latency device, a low concentration mill, a screening device and a concentration machine, and finally reaches a pulp storage tower to complete the pulping. The method has the advantages that through the bleaching liquid multi-stage distribution more favorable for the sufficient realization of the effects of the bleaching liquid and combining the reverse flow reuse of the bleaching filtering liquid at the same time, the utilization efficiency of the bleaching liquid is improved to the maximum degree.

Description

technical field [0001] The invention relates to the field of chemical mechanical pulping, which is an improvement to the pulping process of pretreated alkaline hydrogen peroxide mechanical pulp (P-RC APMP), and in particular relates to a method for improving the utilization efficiency of bleaching liquor produced by P-RC APMP pulping method. Background technique [0002] P-RC APMP pulping is a new generation of chemical mechanical pulping process developed after chemical thermomechanical pulp (BCTMP) and alkaline hydrogen peroxide mechanical pulp (APMP). It is known as "the most promising development in the 21st century." "The pulping process. The process uses alkaline hydrogen peroxide impregnation solution to complete pulping and bleaching simultaneously, and has the advantages of simple production process, high pulp yield, low production line construction and operation costs, and more importantly, only a small amount of completely non-toxic is used in the entire producti...

AI Technical Summary

Problems solved by technology

However, it is inevitable that the P-RCAPMP bleaching solution cannot play a 100% role, and there will still be a certain amount of H in the filtrate after bleaching. 2 o 2 , NaOH, Na 2 SiO 3 , DTPA and other chemical agents, if the utilization efficiency of chemical agents is not improved as much as possible, on the one hand, it will cause waste and increase chemical consumption, and on the other hand, it will also increase the burden on subsequent sewage treatment

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