Two-step isolation type full non-chlorine full cotton stalk bleaching pulp cleaning production process

Abstract

The invention discloses a clean production technology of two-step isolation type totally chlorine-free and whole cotton stalk bleaching pulp, which has the advantages of simplifying the process, saving cost, reducing pollution, saving energy and the like. The clean production technology comprises the following steps of: 1) material preparation: the whole cotton stalk plant material is treated with cotton-shell removal, leave removal and cutting-off; 2) steaming and water washing; 3) discongesting: the whole cotton stalk material is sent to a compressing and discongesting machine for compression and discongesting; 4) first-step dipping: a one-step bleaching solution is used for dipping the whole cotton stalk material released from the compressing and discongesting machine, and the dipping is maintained; 5) first-step bleaching: the dipped whole cotton stalk material is heated and bleached; 6) jordaning of a first stage: the bleached whole cotton stalk material is ground into unscreened stock by a pulping machine; 7) second-step dipping: the unscreened stock ground by the pulping machine is dipped by using a second-step bleaching solution; 8) second-step bleaching: the unscreened stock treated with second-step dipping is heated and bleached; 9) jordaning of a second stage: the unscreened stock treated with second-step bleaching is ground and dissolved into water pulp; 10) pulp washing and pulp shoving; and 11) stock screening and pulp forming.

Description

technical field [0001] The invention belongs to the field of clean pulping and papermaking of all chlorine-free bleached pulp, and in particular relates to a clean pulp production process suitable for using an alkaline peroxide chemical-mechanical pulping process to carry out bleaching of all-chlorine-free cotton-stalk pulp. Background technique [0002] The clean production of chlorine-free cotton stalk bleached pulp by chemical mechanical pulping method should create a set of full cotton stalk bleaching pulp suitable for the raw material according to the characteristics of cotton stalk raw materials and the advantages and disadvantages of various chemical mechanical pulping processes. Clean pulping process of chlorine-free bleached pulp. [0003] The biggest feature of cotton stalk raw materials is that the roots, stalks and branches of all cotton stalk raw materials are uneven in hardness, uneven in density, and soft in texture. The raw materials that are cut and crushed ...

AI Technical Summary

Problems solved by technology

[0007] For the poplar chemical-mechanical pulping process introduced in the published patents, the practice of the present invention proves that the processing technology for poplar chips has many unsuitable points for the raw material of cotton stalks, mainly because the temperature is too low, Can not meet the bleaching strength requirements of cotton stalks

[0008] In addition, in the traditional bleaching production process, the heating medium is generally water and steam in direct contact with the slurry, which has the problems of inaccurate measurement, pollution of the heating medium, increased amount of primary sewage, waste of chemicals, and waste of energy.