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Pulping method using high-concentration brine as cooking medium

A concentrated brine and medium technology, applied in the field of pulp and paper making, can solve the problems of difficult recycling and treatment of high-salt wastewater and large water resource consumption, and achieve the effect of reducing the content of impurities and various ions and avoiding consumption

Inactive Publication Date: 2018-12-18
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a pulping method using high-concentration brine as a cooking medium to solve the problems of excessive consumption of water resources in the paper pulping industry and difficult recovery and treatment of high-salt wastewater

Method used

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Examples

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Embodiment 1

[0062] The pulping method using high-concentration brine as the cooking medium of the present embodiment comprises the following steps:

[0063] (1) Add a precipitant and a flocculant to the high-concentration brine, mix well, and then settle it until the turbidity of the supernatant is lower than 25FTU and the color is lower than 15 degrees, remove the precipitate, and obtain the pretreated high-concentration brine;

[0064] Wherein, the high-concentration brine is seawater, and its main components are as follows: the salt content of seawater is 35.5g / kg, wherein, the content of sodium element is 10.77g / kg, the content of magnesium element is 1.29g / kg, calcium The element content is 0.412g / kg. The flocculant is PAC, and its dosage is that the volume ratio of the flocculant to the high-concentration brine is 5:1000. The precipitation agent is NaOH and Na 2 CO 3 It is mixed according to the mass ratio of 4:1, and the dosage is 5.5:1000 of the mass ratio of the precipitant t...

Embodiment 2

[0071] The pulping method using high-concentration brine as the cooking medium of the present embodiment comprises the following steps:

[0072] (1) Add a precipitant and a flocculant to the high-concentration brine, mix well, and then settle it until the turbidity of the supernatant is lower than 25FTU and the color is lower than 15 degrees, remove the precipitate, and obtain the pretreated high-concentration brine;

[0073] Wherein, the high-concentration brine is brackish water, and its main components are as follows: the salt content of brackish water is 10.6g / kg, wherein, the content of sodium element is 3.26g / kg, and the content of magnesium element is 0.20g / kg, the content of calcium element is 0.54 / kg. The flocculant is PAM, and its dosage is that the volume ratio of the flocculant to the high concentrated brine is 20:1000. The precipitation agent is NaOH and Na 2 CO 3 It is mixed according to the mass ratio of 1:2, and its dosage is 2:1000 of the mass ratio of th...

Embodiment 3

[0080] The pulping method using high-concentration brine as the cooking medium of the present embodiment comprises the following steps:

[0081] (1) Add a precipitant and a flocculant to the high-concentration brine, mix well, and then settle it until the turbidity of the supernatant is lower than 25FTU and the color is lower than 15 degrees, remove the precipitate, and obtain the pretreated high-concentration brine;

[0082] Wherein, the high-concentration brine is high-salt wastewater produced by RO treatment, and its main components are as follows: the salt content of high-concentration brine is 45.7g / kg, wherein the content of sodium element is 13.90g / kg, and the content of magnesium element The content is 1.66g / kg, and the content of calcium element is 0.531g / kg. The flocculant is formed by mixing PAC and PAM in a mass ratio of 1:2, and the dosage is that the volume ratio of the flocculant to the high-concentration brine is 12:1000. The precipitation agent is NaOH and N...

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Abstract

The invention provides a pulping method using high-concentrated brine as a cooking medium, and the pulping method comprises the following steps: adding a flocculating agent to the high-concentrated brine, settling, adding an alkali to the high-concentrated brine, and mixing evenly to obtain a cooking liquid; adding a plant fiber raw material to the cooking liquid, then adding a catalyst to the cooking liquid, mixing evenly, heating and cooking the mixed liquid, and extracting pulp black liquor in pulp to obtain the pulp black liquor and target pulp. The pulping method using the high-concentrated brine as the cooking medium can make full use of water resources such as sea water and inland brackish water to avoid competition with resident living water, other industrial water and the like, can also utilize the high salinity wastewater produced by RO treatment technology, only solves the water resource problem of pulping and papermaking, but also solves the wastewater treatment problem ofthe RO treatment technology.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and in particular relates to a pulping method using high-concentration brine as a cooking medium. Background technique [0002] According to the statistics of the Ministry of Environmental Protection of my country, the total water consumption of my country's paper industry in 2015 was 11.835 billion tons, of which fresh water was 2.898 billion tons, accounting for 7.5% of the total industrial fresh water consumption. The huge consumption of water resources has become a bottleneck restricting the development of the pulp and paper industry. Many large-scale pulp and paper projects are restricted due to the high demand for water resources. Some coastal water-scarce areas in my country have restricted the use of pulp and paper enterprises Provide fresh water. [0003] In addition to the consumption of water resources, the wastewater generated by the pulp and paper industry is also a major probl...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C3/22D21H11/12
CPCD21C3/02D21C3/222D21H11/12
Inventor 陈夫山王亚腾宋晓明
Owner QINGDAO UNIV OF SCI & TECH
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