SU926130A1 - Method for refining printed waste paper - Google Patents

Description

(54) METHOD (PROMOTIONAL PRINTING HARDWARE

I

The invention relates to the production of pulp from waste paper, in particular to a method of removing ink from waste paper and can be used in the pulp and paper industry in the manufacture of newsprint.

Methods are known for beating up waste paper, including dissolving paper pulp in a pulper, and treating it with chemical reagents to separate the Printing Ink from the fibers. The ink particles are then removed from the resulting suspension by flotation.

Alkali is widely used as a chemical reagent for separating printing ink particles, which facilitates the saponification of binder inks.

In order to prevent the mass from yellowing from exposure to alkali and to achieve a higher degree of whiteness, bleaching agents in the form or are also added to the pulper. After separation

Particles of paint should float to the surface, which is facilitated by their coaguli in large flakes. For this purpose, surface active substances (surfactants) and organic reagents are used, for example, soap or fatty acids forming hydrophobic flakes, to which paint particles and air bubbles are attached, are used. The whiteness of the refined waste mass is

0 55%. A further increase in whiteness (up to 60%) can be obtained by increasing the amount of hydrogen peroxide fed into the pulper and the addition of protein from the refined mass of hydrosulphonite C.

Claims (3)

There is a known method for refining waste paper, in which an alkaline solution is fed into the waste paper grinding machine, into which water glass and hydrogen peroxide are added to bleach hair and dissolve paint, and oleic acid 2 is added as a wetting and flotation reagent. Closest to the present invention is a method for refining waste paper by dissolving it, treating it with an organic solvent-based composition, such as kerosene, in which the surface-active substances are dissolved, and with a 10% aqueous alkali solution 31. A disadvantage of the known methods is primarily that the treatment of the paper pulp with alkalis and bleaching agents leads to the destruction of the fiber structure, reduction in their durability, and therefore makes it impossible to repeatedly recover the pulp from waste paper as a raw material for paper production. In addition, the reagents used are deficient, have a complex composition and require maintaining the pH of the medium and the hardness of fresh water within narrow limits, the need for careful control of the environment and adjustment complicates the process and increases its cost. The purpose of the invention is to simplify the process. This goal has been achieved by the fact that according to the method of upgrading printed garbage, including dissolving paper pulp, treating it with flotation reagent in the presence of kerosene and flotation, a mixture of dioxane and pyranic alcohols is a byproduct of dimethyldioxane production () isoprene rubber) and is a T-66 reagent according to TU 38 103243-74, operating with O1.O1.74. on O1.O1.80, PRI me R. A dry waste mass, mainly newspaper, is loaded into the chamber of a mechanical flotation machine. T-bb and kerosene reagents are added before the supply or after feeding the pulp into the 9 O4 flotation cell. The dissolution temperature is maintained at 205 ° C. For 10 kg of dry newspaper macula tours add 3 kg of kerosene and 1.5 kg of reagent. The resulting paper pulp has a degree of whiteness of about 6O%. The strength properties and the length of the fibers of the resulting pulp are the same as the corresponding indicators of the fibers from which the original waste paper is made. Thus, preservation of the whiteness, strength of paper fibers and their structure, and, consequently, repeated regeneration is possible. The advantage of the method is the use of a cheap by-product, which reduces the cost of the process, as well as simplifying the method, which does not require additional treatment with alkali. The mixture of T-bb and kerosene reagent used for treatment is not sensitive to water hardness, which simplifies the control and regulation of the technological process. DETAILED DESCRIPTION OF THE INVENTION The invention includes a method for upgrading printed waste paper, including dissolving paper pulp, treating it with a photoparaent in the presence of kerosene, and flotation, characterized in that, to simplify the process, a mixture of dioxane and pyran series is used as a photodiode dioxane. Sources of information taken into account in the examination 1. Pulp and paper industry. Express information, 1974, h 12. 2. The patent of Germany No. 2339591, cl. 55 in 4, 1974. 3. The UK patent number 1347971, cl. D 21 1l / 1974 (prototype).