Waste paper light residue recovering and processing technology

Abstract

The invention relates to the technical field of comprehensive processing methods of waste residues, and concretely relates to a waste paper light residue recovering and processing technology. The technology comprises the following steps: (1) light residues are magnetically separated; (2) the magnetically separated light residues are fed into a pulp disintegrator, and are disintegrated to obtain afirst-stage accepted stock and a first-stage residue pulp; (3) the first-stage residue pulp is processed by a defibrizer, a re-crusher and a cylinder screen to an accepted stock, the accepted stock returns into the pulp disintegrator, and is disintegrated again, and the first-stage accepted stock goes through a residue remover and a pressure screen to obtain a second accepted stock and a second-stage residue pulp; (4) the second-stage accepted stock enters an OCC line heavy residue remover and is recovered, and the second-stage residue pulp enters a flotation light residue machine to obtain athird-stage accepted stock and a third-stage residue pulp; (5) the third-stage accepted stock enters the pulp disintegrator, and is disintegrated, and the third-stage residue pulp enters an impurity separator, and undergoes flotation to obtain a fourth-stage accepted stock and a fourth-stage residue pulp; and (6) the fourth-stage accepted stock enters the pulp disintegrator, and is disintegrated again, and the fourth-stage residue pulp and the residue pulp which is obtained after treatment using the cylinder screen are mixed, and then undergo sludge pressing treatment. Valuable components in the light residue of the waste paper pulping workshop are recycled to the greatest extent, and recycled metal and plastic granules which are the externally transported have single composition, and canbe conveniently recycled subsequently.

Description

technical field [0001] The invention relates to the technical field of waste residue comprehensive treatment methods, in particular to a waste paper light residue recovery and treatment process. Background technique [0002] A large amount of paper is used in our country every year, but a large amount of waste residue will appear in the papermaking process. According to statistics, about every ton of paper produced will produce 0.2 tons of pulping light residue. my country's waste paper pulping increased from 28.1 million tons in 2005 to 53.05 million tons in 2010, accounting for the proportion of total pulp consumption increased from 54.0% to 62.7%, of which the proportion of domestic waste paper pulp increased from 27.8% to 38.0%. [0003] The main components of light slag in waste paper pulping workshop are plastic, paper fiber, metal and other impurities. According to statistics, in dry light slag, plastic accounts for 70%, metal accounts for 5%, paper fiber accounts f...

AI Technical Summary

Problems solved by technology

However, chlorine ions are introduced during the treatment process, which will cause certain pollution and poor environmental protection.

In addition, the recovery rate of metal resources is relatively low through this method of waste residue treatment, which will also cause waste of resources to a certain extent.