CN102817267A - Method for enhancing using effect of magnesium oxide in P-RC APMP (Preconditioning-Refiner Chemical Treatment Alkaline Peroxide Mechanical Pulp) production by grinding pretreatment - Google Patents
Method for enhancing using effect of magnesium oxide in P-RC APMP (Preconditioning-Refiner Chemical Treatment Alkaline Peroxide Mechanical Pulp) production by grinding pretreatment Download PDFInfo
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- CN102817267A CN102817267A CN2012102588907A CN201210258890A CN102817267A CN 102817267 A CN102817267 A CN 102817267A CN 2012102588907 A CN2012102588907 A CN 2012102588907A CN 201210258890 A CN201210258890 A CN 201210258890A CN 102817267 A CN102817267 A CN 102817267A
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Abstract
The invention relates to a method for enhancing the using effect of magnesium oxide in P-RC APMP (Preconditioning-Refiner Chemical Treatment Alkaline Peroxide Mechanical Pulp) production by grinding pretreatment. The method comprises the following steps of: (1) adding magnesium oxide suspension liquid in wood filiform pulp which is subjected to first-stage defibrination, transferring into a high-concentration remaining section together with the pulp so as to bleach the pulp; (2) extruding and collecting the extruded-out residue liquid for detecting the waste liquid characteristic after the bleaching; (3) carrying out second-stage defibrination to the bleached pulp in a pulping machine; (4) carrying out latency treatment on the pulp obtained after the second-stage defibrination; (5) screening the pulp obtained after the latency treatment by a slotted screen; (6) taking a part pulp sample after the latency treatment, pulping to (45 plus or minus 2) degrees SR by a PFI mill under the concentration of 10%, and then defibering; and (7) carrying out papermaking of handsheet and physical property detection. Compared with the traditional P-RCAPMP technique which uses soda as an alkali source, according to the method provided by the invention, not only the optical properties of bulk, light-scattering coefficient and the like of the pulp are enhanced, but also the physical property of the pulp are enhanced to a certain degree, so that the using effect of magnesium oxide as alkaline peroxide leaching alkali source in high-yield pulp can be enhanced better, so that the production quality of the high-yield pulp is improved.
Description
Technical field
The invention belongs to the pulping and paper-making field, relate to chemi-mechanical pulp, especially a kind of method that preliminary treatment improves magnesia result of use in P-RC APMP produces of grinding of utilizing.
Background technology
High yield pulp is meant pulping yield in the slurry kind more than 75%, and general yield is 75%～95%.High yield pulp had both comprised traditional SGW (SGW), pressure ground wood pulp (PGW), chip groundwood (RMP), comprised various chemi-mechanical pulps (CMP), thermomechanical pulp (TMP), bleached chemical thermomechanical pulp (BCTMP), the APMP (APMP) that development in recent years is got up again and adopted gentle preliminary treatment to add the chemically treated APMP of mill (P-RC APMP).Wherein, SGW and RMP pulping process since equipment capacity low with aspects such as pulp property is relatively poor, superseded basically at present; TMP technology is raw material with needlebush (like dragon spruce, pine etc.) usually, and the paper pulp of being produced only is used for more limited paper kind such as supercalendered paper, newsprint etc.; BCTMP, APMP and P-RC APMP pulping process are raw material with broadleafs such as poplar, birch, Eucalyptus, maples usually; The pulp brightness of being produced, bulk and mechanical strength are all higher; Its good pulp property receives welcome more and more widely, is usually used in recent years substituting or partly substitutes bleaching leaf wood chemical pulp producing high-grade paper or cardboard.Compare with chemical pulp; High yield pulp can more effectively utilize fibrous raw material; And have that yield height, consumption of chemical agent are few, capital expenditure province, raw material wide accommodation, advantage such as the pulp applications scope is wide, waste liquor contamination is few, ton slurry water consumption is few, production process cleaning, paper product health are nontoxic; Growth rate is very fast since the eighties in last century, is one of slurry kind that mainly develops 21 century.At present, usually said high yield pulp mainly refers to chemi-mechanical pulp, i.e. BCTMP, APMP and P-RC APMP.
It is alkali source that the pulping process of high yield pulp adopts NaOH usually, partly degrades but the strong basicity of NaOH can cause hemicellulose, and paper pulp yield reduces, and the contaminated wastewater load increases.The use of NaOH makes that the initial alkalescence of paper pulp system is higher, and a large amount of anionic trashes that form thus can and be copied paper quality to paper machine operation and bring harmful effect; Also can cause the formation of oxalates with NaOH as the alkali source of high yield pulp hydrogen peroxide bleaching, calcium ion is easy to enrichment takes place and forms calcium oxalate dirt thing in oxalates and the system, thereby influences the production operation and the pulp quality of high yield.Therefore, the scientific research personnel of domestic and international pulping and paper-making circle has actively developed with MgO or Mg (OH) in recent years
2Deng weak base is the research work of the high yield cooking bleaching technology of alkali source.
China is the abundantest country of magnesium ore resources in the world, and magnesia also has long production history, and its price is far below NaOH.Therefore, research and development substitute with magnesium alkali or part substitutes the high yield cooking technology of soda as the bleaching alkali source, and eliminating or reducing traditional is the problem that exists in the high yield cooking technology of alkali source with the soda, and very important meaning is arranged.
By retrieval, do not find the publication document identical as yet with the present patent application.
Summary of the invention
The objective of the invention is to be to provide a kind of method that preliminary treatment improves magnesia result of use in P-RC APMP produces of grinding of utilizing, this method is ground preprocessing means through magnesia and is improved magnesium alkali as the effect of high yield pulp bleaching alkali source in alkaline hydrogen peroxide bleaching technology.
The present invention solves its technical problem and takes following technical scheme to realize:
A kind of utilization ground the method that preliminary treatment improves magnesia result of use in P-RC APMP produces, and step is:
⑴ will pass through in the wood wool shape slurry that grinds behind one section defibrination that pretreated magnesia magma joins P-RC APMP production technology, together get into high dense stops with slurry then and section slurry bleached;
⑵ after bleaching action finishes, taking-up part slurry appearance, the raffinate that extruding and collection are extruded is used to measure bleaching waste liquor pH value, electrical conductivity, cationic demand and chemical oxygen consumption (COC);
⑶ will carry out two sections defibrinations through the slurry after too high dense stop is handled in fiberizer, the slurry after will handling through two sections defibrinations disappears to dive and handles, and starches dense 0.5%-8%, and temperature 60-95 ℃, the 20-40 min that dives disappears;
⑷ screen the slurry that disappears after diving with slotted screen, and the slurry of collecting after screening stores for future use;
⑸ take out slurry after the part screening handsheet of manufacturing paper with pulp, and measures the physical performance index of paper pulp, copy sheet before, earlier with slurry under 10% concentration with the making beating of PFI mill to (45 ± 2) oSR, discongest 15000 commentaries on classics with the standard fluffer;
⑹ carry out manufacturing paper with pulp of handsheet according to U.S.'s pulping and paper-making association criterion method and corresponding physical property detects.
And; The preprocess method of magnesia magma is among the said step ⑴: technical grade magnesia pressed powder is joined in the grinder container; Use running water to be mixed with the suspension of concentration as 5%-30%, then in grinding machine for grinding, grinding blue rotating speed is 1000 rpm; After grinding certain hour, take off magnesian container is housed, be transferred in the magnesia dipper magnesia magma after grinding subsequent use.
And the high dense section conditions of bleaching to slurry that stops is among the said step ⑴: slurry concentration 15%-35%, and total alkali charge 2.0%-3.5%, the mol ratio ratio of wherein grinding pretreated MgO replacement NaOH is 25%-50%, Na
2SiO
30.5%-2.0%, DTPA 0.1%-0.5%, H
2O
22.5%-6.0%, MgSO
40.05%-0.2%, bleaching temperature 80-87 ℃, bleaching time 60-95 min.
And two sections defibrination conditions are among the said step ⑶: 0.08-0.20 mm in slit between mill, refining concentration 2%-10%.
And employed chemicals consumption all measures with over dry slurry quality of fiber percentage.
Advantage of the present invention and good effect are:
1, through grinding preliminary treatment, its particle diameter can be by reducing to 2.5 μ m about 20 μ m with magnesia in the present invention, and the active oxidation content of magnesium improves more than 30%.After use was used for P-RC APMP through the magnesia after the milled processed, the bulk of gained sheet pulp was between 3.40 cm
3/ g-3.20 cm
3Between/the g; The ISO whiteness can be increased to 75.0% by 72.6%; Tensile index can be increased to 9.61 Nm/g by 8.74 Nm/g; Tear index can be by 1.07 mNm
2/ g is increased to 1.49 mNm
2/ g, and the bleaching waste liquor load does not have significant change (waste liquid electrical conductivity 1.65-2.35 mS/cm), chemical oxygen demand cod
CrMaintain between the 880-920 mg/L, about cationic demand 2.30 mmol/L.
2, the paper pulp that the present invention produced is mainly used in the production of medium-to-high grade paper or cardboard; Also can be used for joining and copy supercalendered paper, newsprint and write cultural paper; According to the purposes of high-yield pulp, can suitably adjust the consumption and the corresponding pulping process parameter of chemicals in this pulping process, rationally control magnesian preliminary treatment degree; Can effectively improve magnesium alkali and partly replace the effect of soda, as improve pulp brightness and strength character as high yield pulp alkaline hydrogen peroxide bleaching alkali source.
3, the present invention compares traditional with the high yield cooking technology of soda as alkali source; This method can not only improve optical properties such as the bulk, light scattering coefficient of paper pulp; Also can improve simultaneously the physical property of paper pulp to a certain extent; Can improve the effect of magnesia better, improve the quality of production of high yield pulp as high yield pulp alkaline hydrogen peroxide bleaching alkali source.
Description of drawings
Fig. 1 is P-RC APMP pulping process flow figure of the present invention
Fig. 2 is the perspective view of grinder of the present invention, wherein: the 1-motor; The 2-main frame; The 3-lid; 4-embraces folder; 5-grinds blue; The 6-dispersion impeller; The 7-container; The 8-frequency converter; The 9-support; The 10-base plate.
The specific embodiment
Below in conjunction with embodiment, the present invention is further specified, following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
Embodiment 1:
The employed magnesium alkali of present embodiment is solid technical grade magnesium oxide powder, and its physicochemical characteristic is: white powder, and odorless, tasteless, nontoxic is slightly soluble in water, and the suspension of its water is alkalescent; Be insoluble in organic solvent; Can be dissolved in acid and ammonium salt; The purity of commodity is 87.07%, and calcium oxide content is 1.59%, and iron ion content is 0.38%, and manganese ion content is 0.09%, and content of copper ion is 7 ppm.
The used technical grade magnesia of present embodiment is solid powdery; Grinding pretreated mode is: technical grade magnesia pressed powder is joined in the grinder container; Use running water to be mixed with the suspension of concentration as 5%-30%, then in grinding machine for grinding, grinding blue rotating speed is 1000 rpm.After grinding 5 min, take off magnesian container is housed, be transferred in the magnesia dipper magnesia magma after grinding subsequent use.
A kind of utilization ground the method that preliminary treatment improves magnesia result of use in P-RC APMP produces, and is specially:
With among the present invention through grinding in the wood wool shape slurry behind one section defibrination that pretreated magnesia magma joins P-RC APMP production technology, together get into high dense stops with slurry then and section slurry bleached.High dense stop section conditions of bleaching is: total alkali charge (in NaOH) 2.0%-4.0%, Na
2SiO
30.5%-2.0%, DTPA 0.1%-0.3%, H
2O
23.0%-5.0%, MgSO
40.05%-0.2%, slurry concentration 25%-30%, temperature 80-87 ℃, time 60-95 min.It is 30%-50% that MgO replaces NaOH ratio (mol ratio).
⑵ after treat that bleaching action finishes, take out part slurry appearance, extruding and the raffinate of collecting after extruding are used to measure bleaching waste liquor pH value, electrical conductivity, cationic demand and chemical oxygen consumption (COC) (COD
Cr).
⑶ the slurry after too high dense stop is handled carries out two sections defibrinations in disc mill.Two sections defibrination conditions are: defibrination slit 0.1 mm, refining concentration 10%.Slurry behind two sections defibrinations done disappearing and dive to handle (starch dense 3%-5%, 95 ℃ of temperature, 40 min that dive disappear);
⑷ through the slotted screen screening of 0.15 mm, and the slurry of collecting at last through 0.15 mm slotted screen stores for future use.
⑸ manufacture paper with pulp before the handsheet, earlier with slurry under 10% concentration with the making beating of PFI mill to (45 ± 2) oSR, discongest 15000 commentaries on classics with the standard fluffer.
⑹ carry out manufacturing paper with pulp and the respective physical Performance Detection of handsheet according to U.S. pulping and paper-making association relevant criterion method (Tappi Standard Method):
After grinding 5 min under the 1000 rpm rotating speeds, the magnesian particle diameter of gained is 8.2 μ m to magnesia in a, the present embodiment through grinder, and the active oxidation content of magnesium is 56.77%;
The physical property of the P-RC APMP sheet pulp of the magnesia preparation of b, present embodiment utilization grinding gained is: bulk 3.27 cm
3/ g, ISO whiteness 73.3%, light scattering coefficient 40.45%, tensile index 8.87 Nm/g, tear index 1.37 mNm
2/ g; Bleaching waste liquor performance: bleaching waste liquor electrical conductivity 1.87 mS/cm, cationic demand 2.32 mmol/L, chemical oxygen demand COD
Cr880 mg/L.
Embodiment 2:
The employed magnesium alkali of present embodiment is solid technical grade magnesium oxide powder, and its physicochemical characteristic is: white powder, and odorless, tasteless, nontoxic is slightly soluble in water, and the suspension of its water is alkalescent; Be insoluble in organic solvent; Can be dissolved in acid and ammonium salt; The purity of commodity is 87.07%, and calcium oxide content is 1.59%, and iron ion content is 0.38%, and manganese ion content is 0.09%, and content of copper ion is 7 ppm.
The used technical grade magnesia of present embodiment is solid powdery; Grinding pretreated mode is: technical grade magnesia pressed powder is joined in the grinder container; Use running water to be mixed with the suspension of concentration as 5%-30%, then in grinding machine for grinding, grinding blue rotating speed is 1000 rpm.After grinding 10 min, take off magnesian container is housed, be transferred in the magnesia dipper magnesia magma after grinding subsequent use.
A kind of utilization ground the method that preliminary treatment improves magnesia result of use in P-RC APMP produces, and method is:
With among the present invention through grinding in the wood wool shape slurry behind one section defibrination that pretreated magnesia magma joins P-RC APMP production technology, together get into high dense stops with slurry then and section slurry bleached.High dense stop section conditions of bleaching is: total alkali charge (in NaOH) 2.0%-4.0%, Na
2SiO
30.5%-2.0%, DTPA 0.1%-0.3%, H
2O
23.0%-5.0%, MgSO
40.05%-0.2%, slurry concentration 25%-30%, temperature 80-87 ℃, time 60-95 min.It is 30%-50% that MgO replaces NaOH ratio (mol ratio).
⑵ after treat that bleaching action finishes, take out part slurry appearance, extruding and the raffinate of collecting after extruding are used to measure bleaching waste liquor pH value, electrical conductivity, cationic demand and chemical oxygen consumption (COC) (COD
Cr).
⑶ the slurry after too high dense stop is handled carries out two sections defibrinations in disc mill.Two sections defibrination conditions are: defibrination slit 0.1 mm, refining concentration 10%.Slurry behind two sections defibrinations done disappearing and dive to handle (starch dense 3%-5%, 95 ℃ of temperature, 40 min that dive disappear).
⑷ through the slotted screen screening of 0.15 mm, and the slurry of collecting at last through 0.15 mm slotted screen stores for future use.
⑸ manufacture paper with pulp before the handsheet, earlier with slurry under 10% concentration with the making beating of PFI mill to (45 ± 2) oSR, discongest 15000 commentaries on classics with the standard fluffer.
⑹ carry out manufacturing paper with pulp and the respective physical Performance Detection of handsheet according to U.S. pulping and paper-making association relevant criterion method (Tappi Standard Method):
After grinding 10 min under the 1000 rpm rotating speeds, the magnesian particle diameter of gained is 5.6 μ m to magnesia in a, the present embodiment through basket grinder, and the active oxidation content of magnesium is 60.04%;
The physical property of the P-RC APMP sheet pulp of the magnesia preparation of b, present embodiment utilization grinding gained is: bulk 3.24 cm
3/ g, ISO whiteness 73.86%, light scattering coefficient 40.48%, tensile index 8.99 Nm/g, tear index 1.39 mNm
2/ g; Bleaching waste liquor performance: bleaching waste liquor electrical conductivity 2.20 mS/cm, cationic demand 2.24 mmol/L, chemical oxygen demand COD
Cr886 mg/L.
Embodiment 3:
The employed magnesium alkali of present embodiment is solid technical grade magnesium oxide powder, and its physicochemical characteristic is: white powder, and odorless, tasteless, nontoxic is slightly soluble in water, and the suspension of its water is alkalescent; Be insoluble in organic solvent; Can be dissolved in acid and ammonium salt; The purity of commodity is 87.07%, and calcium oxide content is 1.59%, and iron ion content is 0.38%, and manganese ion content is 0.09%, and content of copper ion is 7 ppm.
The used technical grade magnesia of present embodiment is solid powdery; Grinding pretreated mode is: technical grade magnesia pressed powder is joined in the grinder container; Use running water to be mixed with the suspension of concentration as 5%-30%, then in grinding machine for grinding, grinding blue rotating speed is 1000 rpm.After grinding 20 min, take off magnesian container is housed, be transferred in the magnesia dipper magnesia magma after grinding subsequent use.
A kind of utilization ground the method that preliminary treatment improves magnesia result of use in P-RC APMP produces, and method is:
With among the present invention through grinding in the wood wool shape slurry behind one section defibrination that pretreated magnesia magma joins P-RC APMP production technology, together get into high dense stops with slurry then and section slurry bleached.High dense stop section conditions of bleaching is: total alkali charge (in NaOH) 2.0%-4.0%, Na
2SiO
30.5%-2.0%, DTPA 0.1%-0.3%, H
2O
23.0%-5.0%, MgSO
40.05%-0.2%, slurry concentration 25%-30%, temperature 80-87 ℃, time 60-95 min.It is 30%-50% that MgO replaces NaOH ratio (mol ratio).
⑵ after treat that bleaching action finishes, take out part slurry appearance, extruding and the raffinate of collecting after extruding are used to measure bleaching waste liquor pH value, electrical conductivity, cationic demand and chemical oxygen consumption (COC) (COD
Cr).
⑶ the slurry after too high dense stop is handled carries out two sections defibrinations in disc mill.Two sections defibrination conditions are: defibrination slit 0.1 mm, refining concentration 10%.Slurry behind two sections defibrinations done disappearing and dive to handle (starch dense 3%-5%, 95 ℃ of temperature, 40 min that dive disappear).
⑷ through the slotted screen screening of 0.15 mm, and the slurry of collecting at last through 0.15 mm slotted screen stores for future use.
⑸ manufacture paper with pulp before the handsheet, earlier with slurry under 10% concentration with the making beating of PFI mill to (45 ± 2) oSR, discongest 15000 commentaries on classics with the standard fluffer.
⑹ carry out manufacturing paper with pulp and the respective physical Performance Detection of handsheet according to U.S. pulping and paper-making association relevant criterion method (Tappi Standard Method):
After grinding 20 min under the 1000 rpm rotating speeds, the magnesian particle diameter of gained is 4.3 μ m to magnesia in a, the present embodiment through basket grinder, and the active oxidation content of magnesium is 62.62%;
The physical property of the P-RC APMP sheet pulp of the magnesia preparation of b, present embodiment utilization grinding gained is: bulk 3.20 cm
3/ g, ISO whiteness 74.50%, light scattering coefficient 41.31%, tensile index 9.61 Nm/g, tear index 1.49 mNm
2/ g; Bleaching waste liquor performance: bleaching waste liquor electrical conductivity 2.35 ms/cm, cationic demand 2.35 mmol/L, chemical oxygen demand COD
Cr915 mg/L.
Claims (5)
1. one kind is utilized the method for grinding preliminary treatment raising magnesia result of use in P-RC APMP produces, and it is characterized in that: step is:
⑴ will pass through in the wood wool shape slurry that grinds behind one section defibrination that pretreated magnesia magma joins P-RC APMP production technology, together get into high dense stops with slurry then and section slurry bleached;
⑵ after bleaching action finishes, taking-up part slurry appearance, the raffinate that extruding and collection are extruded is used to measure bleaching waste liquor pH value, electrical conductivity, cationic demand and chemical oxygen consumption (COC);
⑶ will carry out two sections defibrinations through the slurry after too high dense stop is handled in fiberizer, the slurry after will handling through two sections defibrinations disappears to dive and handles, and starches dense 0.5%-8%, and temperature 60-95 ℃, the 20-40 min that dives disappears;
⑷ screen the slurry that disappears after diving with slotted screen, and the slurry of collecting after screening stores for future use;
⑸ take out slurry after the part screening handsheet of manufacturing paper with pulp, and measures the physical performance index of paper pulp, copy sheet before, earlier with slurry under 10% concentration with the making beating of PFI mill to (45 ± 2) oSR, discongest 15000 commentaries on classics with the standard fluffer;
⑹ carry out manufacturing paper with pulp of handsheet according to U.S.'s pulping and paper-making association criterion method and corresponding physical property detects.
2. a kind of method that preliminary treatment improves magnesia result of use in P-RC APMP produces of grinding of utilizing according to claim 1; It is characterized in that: the preprocess method of magnesia magma is among the said step ⑴: technical grade magnesia pressed powder is joined in the grinder container; Use running water to be mixed with the suspension of concentration as 5%-30%; In grinding machine for grinding, grinding blue rotating speed is 1000 rpm then; After grinding certain hour, take off magnesian container is housed, be transferred in the magnesia dipper magnesia magma after grinding subsequent use.
3. a kind of method that preliminary treatment improves magnesia result of use in P-RC APMP produces of grinding of utilizing according to claim 1; It is characterized in that: the high dense section conditions of bleaching to slurry that stops is among the said step ⑴: slurry concentration 15%-35%; Total alkali charge 2.0%-3.5%; The mol ratio ratio of wherein grinding pretreated MgO replacement NaOH is 25%-50%, Na
2SiO
30.5%-2.0%, DTPA 0.1%-0.5%, H
2O
22.5%-6.0%, MgSO
40.05%-0.2%, bleaching temperature 80-87 ℃, bleaching time 60-95 min.
4. a kind of method that preliminary treatment improves magnesia result of use in P-RC APMP produces of grinding of utilizing according to claim 1; It is characterized in that: two sections defibrination conditions are among the said step ⑶: 0.08-0.20 mm in slit between mill, refining concentration 2%-10%.
5. a kind of utilization the according to claim 1 ground the method that preliminary treatment improves magnesia result of use in P-RC APMP produces, and it is characterized in that: employed chemicals consumption all measures with over dry slurry quality of fiber percentage.
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| CN201210258890.7A CN102817267B (en) | 2012-07-24 | 2012-07-24 | Method for enhancing using effect of magnesium oxide in P-RC APMP (Preconditioning-Refiner Chemical Treatment Alkaline Peroxide Mechanical Pulp) production by grinding pretreatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192502A (en) * | 2016-07-18 | 2016-12-07 | 山东太阳纸业股份有限公司 | A kind of method improving P RC APMP legal system slurry bleaching filtrate utilization rate |
| CN110725148A (en) * | 2019-10-18 | 2020-01-24 | 天津科技大学 | Technology for stabilizing pH value in hydrogen peroxide oxidation bleaching process |
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| GB2053170A (en) * | 1979-03-09 | 1981-02-04 | Feldmuehle Ag | Alumina ceramic components |
| CN1769587A (en) * | 2005-09-22 | 2006-05-10 | 岳阳纸业股份有限公司 | Refined light weight coated paper and its production process |
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| GB2053170A (en) * | 1979-03-09 | 1981-02-04 | Feldmuehle Ag | Alumina ceramic components |
| CN1769587A (en) * | 2005-09-22 | 2006-05-10 | 岳阳纸业股份有限公司 | Refined light weight coated paper and its production process |
| CN101324038A (en) * | 2008-07-10 | 2008-12-17 | 岳阳纸业股份有限公司 | Papermaking process of low basis weight enamelled paper |
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| 袁玮等: "镁碱对PRC-APMP纸浆性能的影响", 《纸和造纸》, vol. 28, no. 09, 31 December 2009 (2009-12-31), pages 25 - 29 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192502A (en) * | 2016-07-18 | 2016-12-07 | 山东太阳纸业股份有限公司 | A kind of method improving P RC APMP legal system slurry bleaching filtrate utilization rate |
| CN106192502B (en) * | 2016-07-18 | 2018-06-19 | 山东太阳纸业股份有限公司 | A kind of method for improving P-RC APMP legal systems slurry bleaching filtrate utilization rate |
| CN110725148A (en) * | 2019-10-18 | 2020-01-24 | 天津科技大学 | Technology for stabilizing pH value in hydrogen peroxide oxidation bleaching process |
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| CN102817267B (en) | 2014-12-17 |
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