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Method and device for preparing chemical-mechanical pulp

A preparation device and a technology of chemical-mechanical pulp, applied in chemical/chemical-mechanical pulp, pulp bleaching, pretreatment with alkaline compounds, etc., can solve the problem of high pulping cost and achieve the effect of reducing pulping cost

Active Publication Date: 2017-05-17
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the proportion of recycled alkali used in the pulping section exceeds 50%, the whiteness of the pulp cannot be maintained above 75% ISO, and additional auxiliary chemicals need to be added, which leads to higher pulping costs

Method used

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  • Method and device for preparing chemical-mechanical pulp
  • Method and device for preparing chemical-mechanical pulp

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0033] refer to figure 1 , the first embodiment of the preparation method of the chemical pulp of the present invention, comprises the following steps:

[0034] Step S110: performing pre-soaking treatment on the hard material, and adding a chemical alkali whose specific gravity is greater than 50% of the recovered alkali during the pre-soaking treatment process.

[0035] The hard material is the raw material for preparing the chemical-mechanical pulp of the present invention. The hard material is one or more of coniferous wood and hardwood.

[0036] The pre-soaking treatment refers to a process of adding pre-soaking chemicals to the hard material and soaking with it. Among them, the commonly added pre-soaking chemicals are chemical alkalis, which generally include mixed alkalis of recycled alkalis and commercial alkalis. Wherein, the recovered alkali refers to the alkali obtained through the nitric causticization reaction after the waste water produced in the pulping proces...

no. 2 approach

[0041] refer to figure 2 , the second embodiment of the preparation method of the chemical pulp of the present invention, comprises the following steps:

[0042] Step S210: Perform one-stage pre-soaking treatment on the hard material, and add chemical alkali whose specific gravity is 100% of recovered alkali during the one-stage pre-soaking treatment process.

[0043] The hard material is one or more of coniferous wood and broad-leaved wood, for example, one or more of acacia, pine and eucalyptus can be used, and the present embodiment adopts acacia, pine and eucalyptus Mixed wood chips, wherein the ratio of acacia: pine: eucalyptus is in the range of 60-80:10-30:0-10.

[0044] During the first stage of presoaking treatment, the added proportion of the recovered alkali is 100%, and the added amount of the recovered alkali is 20kg / adt-22kg / adt.

[0045] Step S220: The material after the first-stage pre-soaking treatment is subjected to the second-stage pre-soaking treatment,...

Embodiment 1

[0066] The input mechanism conveys mixed wood chips containing acacia wood, pine wood and eucalyptus wood, wherein the ratio of acacia wood: pine wood: eucalyptus wood is 70:20:10.

[0067] A section of pretreatment mechanism, such as a wood chip tearing machine, performs extrusion and tearing treatment on the hard material. Wherein the torque of the wood chip tearing machine is set to 155kN·m.

[0068] The hard material that has been squeezed and torn by the pretreatment mechanism enters a stage of prepreg in the prepreg mechanism for a stage of prepreg treatment. During the process of the stage of prepreg treatment, the feeding mechanism feeds the The recovered alkali with a specific gravity of 100% is added to the pre-soaking mechanism, and the added amount of the recovered alkali is 21kg / adt.

[0069] The hard material after one-stage prepreg treatment is sent to the second-stage pretreatment mechanism, such as a wood chip tearing machine for extrusion and tearing, wherei...

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Abstract

The invention discloses a chemi-mechanical pulp preparing method. The method comprises the following steps of presoaking hard materials, adding chemical alkali with the proportion of recovery alkali larger than 50% in a presoaking process, bleaching the presoaked materials, and adding chemical alkali with the proportion of commercial alkali larger than 50% in a bleaching process. The invention further discloses a chemi-mechanical pulp preparing device. By means of changing the using proportion of the presoaking section and the using proportion of the bleaching section in a pulping process, the pulp brightness is guaranteed, and most generated recovery alkali can be timely consumed away. Thus, the synchronous continuous operation of a pulp line and a recycling work section is achieved, and the pulping cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing chemical-mechanical pulp and a device thereof. Background technique [0002] A variety of alkaline chemicals are used in the preparation of chemical-mechanical pulp, and the resulting wastewater has a high alkali content and cannot be discharged directly. In order to solve this problem, the industry usually recycles the wastewater to obtain recovered alkali. The recycled soda obtained from the recovery is used to replace part of the commercial soda as the raw material of the pulping section, which is environmentally friendly and saves consumables. [0003] In order to ensure the smooth progress of the pulping line, at least 70% of the recovered alkali produced in the wastewater recovery section must be consumed in the pulping section. However, when the proportion of recovered alkali used in the pulping section exceeds 50%, the whiteness of the pulp cannot be maintained above 75% ISO, and additional auxil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/02D21B1/16D21C1/06D21C9/10
CPCD21B1/16D21C1/06D21C9/10
Inventor 宋世昌唐飞郑江
Owner GOLD EAST PAPER JIANGSU
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