CN1193061A

CN1193061A - Cooling-pulping paper-making method

Info

Publication number: CN1193061A
Application number: CN98112413A
Authority: CN
Inventors: 周湘洪
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-23
Filing date: 1998-03-23
Publication date: 1998-09-16
Anticipated expiration: 2018-03-23
Also published as: CN1077631C

Abstract

The present invention discloses a paper-making method by adopting cold pulping process, and is characterized by that said invention directly uses chemical agent to make bleaching treatment, according to a certain mixing ratio NaOH and H2O2 are slowly added to a fibered pulp one afler another or simultaneously, and the temperature of the fibered pulp is controlled within 60-110 deg.C by using reaction heat, bleaching time is 30 sec. to 3 hr., so that the fibered pulp with whiteness of above 70 deg. can be obtained. The bleaching liquor is filtered, and the bleach sludge is removed, said bleaching liquor can be circularly used. Said invention possesses the features of simplified production process, saving energy source, reducing cost, shortening bleaching time and raising pulp quality, etc..

Description

The method of cooling-pulping paper-making

The present invention relates to papermaking, particularly the pulping process method.

In the prior art, slurrying generally all will be adopted technologies such as chemicals boiling, rinsing, and is dark through the pulp color of boiling, and bleaching is difficult, and pulping process easy damaged fiber, contaminated environment.Adopt the bleaching method of more chlorination---alkali treatment---calcium hypochlorite to pollute greatly, eliminate the H that promoted the use of in recent years ₂O ₂The method for bleaching of-NaOH still needs a series of corollary equipments such as steam, just can reach requirement through long reaction, and manufacturing technique requirent is strict, and used chemical agent is wide in variety, consumes greatly the cost height.In small business, utilize waste cotton velvet slurrying also to adopt series of process flow processs such as adding alkaline boiling, rinsing, the cost height, seriously polluted.

The objective of the invention is fundamentally to solve the problem that exists in the above-mentioned pulping process, provide a kind of without technologies such as boilings and directly adopt the cooling-pulping paper-making method of Chemical treatment.

Technical scheme of the present invention is: at first fibrous raw material is removed slag, cleans, disperses, be mixed with the fiber pulp of fibre-bearing 20～40%, press then fibrous raw material: NaOH: H ₂O=10: 0.15～0.45: the proportioning of 0.28～2.00 (by content 100%, weight ratio) successively or simultaneously slowly adds NaOH, H ₂O ₂In the fiber pulp of the fibre-bearing 20%～40% of having prepared, utilize reaction heat that the temperature of fiber pulp is controlled at 60～110 ℃, bleaching time 30 seconds to 3 hours gets the above fiber pulp of fibre whiteness 70 degree, bleaching water recycles after removing the gred after filtration, goes up paper machine making again and becomes paper.

In above-mentioned operating process, must add chemical agent by described ratio range, namely the concentration of fiber pulp is not too high or too low, and excessive concentration affects degree of bleaching, and concentration is excessively low, needs to increase consumption of chemical agent, increases cost, and has increased sewage quantity; NaOH, H ₂O ₂The value amount too high, increased cost, and reaction heat can surpass 110 ℃, increase unsafe degree, the value amount is excessively low, reaction heat does not reach requirement; NaOH, H ₂O ₂Answer gradation to add, slowly add or drip by flow-control, prevent that the moment reaction is overheated, difficult control of temperature, even bumping and setting off an explosion.

The present invention preferably technical scheme is: in the pulping bleaching process, press fibrous raw material: NaOH: H ₂O ₂=10: 0.25～0.35: the proportioning of 0.8～1.1 (weight ratio) in the fiber pulp of fibre-bearing 20%～40% successively or add simultaneously NaOH, H ₂O ₂, utilize reaction heat that the temperature of fiber pulp is controlled at 80～95 ℃, in the bleaching time 5 minutes, get the above fiber pulp of whiteness 80 degree.

The present invention preferably technical scheme also can be: in the pulping bleaching process, do not change fibrous raw material and NaOH, H ₂O ₂Proportioning, and increase NaClO, namely press fibrous raw material: NaOH: H ₂O ₂: NaClO=10: 0.15～0.45: 0.28～2: the proportioning of 0.15～0.45 (weight ratio) adds NaOH, H successively in the fiber pulp of fibre-bearing 20%～40% ₂O ₂, NaClO, can improve whiteness 10 degree, make the above fiber pulp of whiteness 80 degree; If with NaOH, H ₂O ₂All reduce by 40% by aforementioned proportioning, increase corresponding NaC1O, namely press fibrous raw material: NaOH: H ₂O ₂: NaC1O=10: 0.09～0.27: 0.17～1.2: 0.15～0.45 (weight ratio) proportioning is bleached, and can reach same bleaching effect, but NaClO compares H ₂O ₂Price want considerably cheaper, so just greatly reduce production cost.

The technical scheme that the present invention makes yellow paper for worshipping the gods is: utilize waste cotton to make raw material, through dredging suede remove slag cleanings, cold pulping and bleaching, in the cotton fiber slurry of having bleached in cotton fiber: alkaline Jing Huang: the ratio of precipitated calcium carbonate=10: 0.05～0.15: 0.25～0.75 add alkaline Jing Huang and precipitated calcium carbonate manufacture paper with pulp again yellow paper for worshipping the gods.

Above-mentioned cooling-pulping paper-making method is that first slurrying is bleached fiber pulp then, in practical operation, also can bleach fibrous raw material earlier, and slurrying again, its used chemical agent and proportioning are as hereinbefore.Used fibrous raw material is various strings, as waste cotton, waste paper, rag, fiber crops, sugared slag, xylon, bamboo fibre etc.

Compared with prior art, the present invention has following tangible advantage:

1, simplified production technology, energy savings has reduced production cost.Cold pulping and bleaching of the present invention without boiling, without sulfuric acid, without liquid chlorine and waterglass, and utilizes waste fiber to make raw material, make the slurrying cost per ton only in 1000 yuan, and prior art slurrying cost is per ton more than 4000 yuan.

2, shorten bleaching time, improved stock quality.As long as cold pulping and bleaching of the present invention is NaOH and H ₂O ₂Proportioning appropriate, reaction temperature can reach more than 80 ℃, bleaching time only needs a few minutes, degree of bleaching is than for a long time better, and the bleaching of prior art needs about 4 hours, without sulfuric acid, without boiling, has protected preferably fiber quality in pulping bleaching.

3, reduce environmental pollution, saved water consumption.The different boilings of the present invention, carry out chemical treatment at the sealing stock tank, avoided air pollution, the rinse water that does not add chemical agent in the pulping process is advanced filtering ponds and can be recycled again through post precipitation, the superfluous water that has added chemical agent in the pulping process is gone into the white water chest recycle, the precipitated fiber screenings regularly goes out to remake pulping raw material clearly in the white water chest, has solved the pollution problem of sewage to environment.

Below the present invention is described in further detail by specific embodiment.

Embodiment 1 waste cotton velvet 100kg, disperse the eliminating particle laggard pulper of shape impurity and add water 140kg to filter by slanted screen through dredging the suede machine, filtered water enters filtering ponds, linter pulp enters the hollander making beating, make the linter pulp 300kg that contains dried fiber 33% (weight), enter again stock tank and add the chemical agent bleaching: with NaOH10kg, the H of concentration 27.5% (weight) of concentration 30% (weight) ₂O ₂20kg adds the stock tank bleaching successively, 70 ℃ of the reaction heat that produces, 90 minutes reaction time, the linter pulp that makes enters the further refinement of jordan, cross then plansifter and sift out thick long fibre continuation making beating, plain boiled water enters white water chest and recycles, and thin linter pulp advances header box to be sent, and becoming whiteness through paper machine making again is the paper of 70 degree.

Embodiment 2～5 fibrous raw materials are respectively waste paper, rag, fiber crops, sugared slag, and pulping bleaching step and method are with embodiment 1, and process control parameter sees table 1 for details.

Embodiment 6～8 slurrying steps and method are with embodiment 1, and the fiber pulp that makes enters stock tank, adds successively NaOH, H ₂O ₂With the NaClO bleaching, addition and process control parameter see table 1 for details.

Embodiment 9 fibrous raw materials are waste cottons, pulping bleaching step and method are with embodiment 1, process control parameter sees table 1 for details, in addition, in the linter pulp of going into stock tank, add the yellow 1kg of alkaline Jing again, precipitated calcium carbonate 5kg makes yellow paper for worshipping the gods, and its whiteness of ashes after this yellow paper for worshipping the gods burning can reach more than 60 degree.

Table 1 cold pulping technology controlling and process table

Embodiment	Fiber pulp concentration (%)	Chemical agent prescription (kg)			Bleaching temperature (℃)	Bleaching time (minute)	Whiteness (degree)
		Chemical agent prescription (kg)						27.5％H ₂O ₂	?30％NaOH	?30％NaClO
		?1	?40	????20				27.5％H ₂O ₂	?30％NaOH	?30％NaClO	????10	????0	??70	??90	??70
?2	?35	?1	?40	????20	????72	????5	????0	??110	??0.5	??98	????10	????0	??70	??90	??70
?2	?35	?3	?30	????10	????72	????5	????0	??110	??0.5	??98	????15	????0	??60	??150	??70
?4	?25	?3	?30	????10	????40	????8	????0	??92	??1.5	??90	????15	????0	??60	??150	??70
?4	?25	?5	?20	????29	????40	????8	????0	??92	??1.5	??90	????11	????0	??80	??5	??80
?6	?40	?5	?20	????29	????6	????3	????15	??80	??5	??80	????11	????0	??80	??5	??80
?6	?40	?7	?30	????44	????6	????3	????15	??80	??5	??80	????9	????5	??85	??1	??90
?8	?20	?7	?30	????44	????20	????10	????10	??90	??2	??80	????9	????5	??85	??1	??90
?8	?20	?9	?40	????20	????20	????10	????10	??90	??2	??80	????10	????0	??70	??80	??70

Claims

1, a kind of method of cooling-pulping paper-making comprises that removing slag of fibrous raw material clean dispersion, pulping bleaching, manufacture paper with pulp into the process such as paper, it is characterized in that in the pulping bleaching process by fibrous raw material: NaOH: H ₂O ₂The proportioning of=10: 0.15～0.45: 0.28～2.00 (by content 100%, weight ratio) successively or simultaneously slowly adds NaOH, H ₂O ₂In the fiber pulp of the fibre-bearing 20%～40% of having prepared, utilize reaction heat that the temperature of fiber pulp is controlled at 60～110 ℃, bleaching time 30 seconds to 3 hours gets the above fiber pulp of fibre whiteness 70 degree, and bleaching water recycles after removing the gred after filtration.

2, the method for cooling-pulping paper-making according to claim 1 is characterized in that the optimum formula that uses in the pulping bleaching process is fibrous raw material: NaOH: H ₂O ₂=10: 0.25～0.35: 0.8～1.1 (weight ratio).

3, the method for cooling-pulping paper-making according to claim 1, the reaction temperature that it is characterized in that pulping bleaching is 80～95 ℃.

4, the method for cooling-pulping paper-making according to claim 1, the chemical agent that it is characterized in that pulping bleaching can also be NaOH, H ₂O ₂And NaClO, its proportioning is: fibrous raw material: NaOH: H ₂O ₂: NaClO=-10: 0.15～0.45: 0.28～2.00: 0.15～0.45, can make the above fiber pulp of whiteness 80 degree.

5, the method for cooling-pulping paper-making according to claim 1 is characterized in that pulping bleaching chemical agent proportioning can be with NaOH and H ₂O ₂All reduce by 40%, increase corresponding NaClO, namely press fibrous raw material: NaOH: H ₂O ₂: NaClO=10: 0.09～0.27: 0.17～1.20: 0.15～0.45 (weight ratio) proportioning is bleached, and reaches effect same.

6, the method for cooling-pulping paper-making according to claim 1 is characterized in that fibrous raw material can first slurrying after bleaching, also can bleach earlier rear slurrying.

7, the method for cooling-pulping paper-making according to claim 1 is characterized in that in the cotton fiber bleached slurry in cotton fiber: alkaline Jing Huang: the ratio of precipitated calcium carbonate=10: 0.05～0.15: 0.25～0.75 add basic yellow and precipitated calcium carbonate manufacture paper with pulp again yellow paper for worshipping the gods.

8, the method for cooling-pulping paper-making according to claim 1 is characterized in that used fibrous raw material is various strings.