CN103334329A - Bamboo pulp green liquor silica pre-removing method through utilizing sodium bentonite and application of method - Google Patents
Bamboo pulp green liquor silica pre-removing method through utilizing sodium bentonite and application of method Download PDFInfo
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- CN103334329A CN103334329A CN2013102677002A CN201310267700A CN103334329A CN 103334329 A CN103334329 A CN 103334329A CN 2013102677002 A CN2013102677002 A CN 2013102677002A CN 201310267700 A CN201310267700 A CN 201310267700A CN 103334329 A CN103334329 A CN 103334329A
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- sodium bentonite
- bamboo pulp
- green liquor
- pulp green
- silica removal
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Abstract
The invention discloses a bamboo pulp green liquor silica pre-removing method through utilizing sodium bentonite and an application of the device, and belongs to the technical field of paper making. The method comprises the following steps of: 1, adding water into sodium bentonite according to the mass ratio of sodium bentonite to water being 1 to 8-64, mixing and completely stirring for 5-10 minutes so as to obtain a sodium bentonite slurry; and 2, adding bamboo pulp green liquor to be treated into the sodium bentonite slurry, completely stirring for 5-10 minutes, standing, and then filtering to obtain filter liquor so as to obtain the bamboo pulp green liquor after the silica pre-removing. The sodium bentonite serves as a silica pre-removing agent for the silica pre-removing treatment on the bamboo pulp green liquor, so that a 'silica interference' problem in a paper making process can be relieved. Experiments prove that the silica pre-removing rate of the silica pre-removing agent, namely the sodium bentonite can reach 50.8%, and the silica removing loads of subsequent processes are relieved, so that the reaction energy consumption of enterprises is effectively lowered.
Description
Technical field
The invention belongs to pulp technology for making paper, be specifically related to a kind of sodium bentonite to method and the application thereof of the pre-silica removal of bamboo pulp green liquor.
Background technology
The non-wood-fiber paper making raw material is the resource of a kind of important renewable fiber of China.Particularly after country releases " 12 energy-saving and emission-reduction planning ", environmental protection and energy-saving and emission-reduction being had higher requirement, is very necessary so correctly be familiar with non-wood material in the importance aspect China's pulping and paper-making and position.
Because the cause specific of non-wood fibrous raw material self, hemicellulose level is than timber height, and heteroproteose cell is many, ash content height, silica account for ash content more than 60%, and the result causes alkali recovery process " silicon interference " problem, it is mainly reflected in evaporation, workshop sections such as causticization and lime recovery.At caustic room, have CaSiO in the green liquor causticizing reaction
3Generate, reduced the causticizing efficiency of green liquor, in addition, generated lime at burning of lime sludge and be back in the process of caustic room, silicon in the white clay can reduce the lime activity, in addition, the silicon in the white clay can make in the white clay residual base number higher, because residual alkaloid substance fusing point is lower than lime, fusing earlier before white clay carries out calcination reaction or in the course of reaction, form piece or stick on the inwall of limekiln with lime and form balling, ring formation and knot ring, the result causes that the limekiln is as easy as rolling off a log breaks down.
More than these problems alkali recovery efficiency is reduced, and it is serious to make papermaking wastewater handle workshop section's power consumption, does not reach national requirements.The researcher has proposed a lot of solutions for bamboo pulp green liquor " silicon interference " problem, as carbon dioxide process, aluminate method and soda lime method etc., these methods all only are confined to special silica removal section, because silicone content is higher in the green liquor, cause silica removal section consumption amount of reagent big, not capable of circulation, power consumption is big, finally makes entreprise cost increase.
General desiliconizing agent great majority are selected for use a large amount of chemical reagent to carry out chemical method and handled, and are irreversible though the method can improve silica removal efficient, do not circulate, and the cost height, shortcomings such as the big even change green liquor character of consumption are difficult to avoid.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of sodium bentonite to method and the application thereof of the pre-silica removal of bamboo pulp green liquor, safe and effective, the energy-conserving and environment-protective of this method.
The present invention is achieved through the following technical solutions:
Sodium bentonite may further comprise the steps the method for the pre-silica removal of bamboo pulp green liquor:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:8～64, in sodium bentonite, add water, after the mixing, fully stir 5～10min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 5～10min after, leave standstill, cross leaching filtrate then, obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp filtrate and the mass ratio of the sodium bentonite in the sodium bentonite slip are 30～50:1.
Sodium bentonite may further comprise the steps the method for the pre-silica removal of bamboo pulp green liquor:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:32, in sodium bentonite, add water, after the mixing, fully stir 5min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 5min after, leave standstill, filter then, get filtrate, obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite in the sodium bentonite slip are 45.7.
Step 2) described time of repose is 15～25min.
Also comprise will obtain the bamboo pulp green liquor of pre-silica removal after handling send into silica removal workshop section, the precipitation that filtration obtains is sent into washing room, washing and recycling obtains sodium bentonite.
Sodium bentonite is as the application of the pre-desiliconizing agent of papermaking bamboo pulp green liquor.
The application of sodium bentonite in the pre-desiliconizing agent of preparation papermaking bamboo pulp green liquor.
Compared with prior art, the present invention has following beneficial technical effects:
Sodium bentonite is a kind of in the bentonite, be to divide according to exchangeable cations kind, content between montmorillonite layer, alkalescence coefficient more than or equal to 1 be sodium bentonite, the present invention with sodium bentonite as pre-desiliconizing agent, the bamboo pulp green liquor is carried out pre-silica removal to be handled, thereby can alleviate " silicon interference " problem in the paper process, checking by experiment, the pre-silica removal rate of the pre-desiliconizing agent sodium bentonite that the present invention is used can reach 50.8%, reduce the silica removal load of follow-up workshop section, thereby reduced the energy consumption of reaction of enterprise effectively.The present invention utilizes sodium bentonite simple to operate, safe and effective to the method for the pre-silica removal of bamboo pulp green liquor, and environmental friendliness is fit to large-scale industrialization and amplifies production.
Further, the sodium bentonite behind the pre-silica removal of the present invention can wash the back recycle and reuse, thereby has further reduced energy consumption.
The present invention verified the silica removal performance of sodium bentonite, thereby sodium bentonite can be applied in the pulp technology for making paper as pre-desiliconizing agent by tests such as silica removal test and element silicon spectroscopy detection.
Description of drawings
Fig. 1 is the comparison collection of illustrative plates of three kinds of bentonite adsorption swelling performances of the present invention's screening;
Fig. 2 is the required amount of water of swollen sodium bentonite and expansion capacity graph of a relation in green liquor;
Fig. 3 is the element silicon alkali resistant dissolubility infrared spectrogram of sodium bentonite in strong alkali solution;
Fig. 4 can spectrogram for what add silicone content in the bamboo pulp green liquor before and after the sodium bentonite, wherein a for silicone content in the bamboo pulp green liquor that does not add sodium bentonite can spectrogram, b can spectrogram for what add silicone content in the bamboo pulp green liquor after sodium bentonite is handled.
The specific embodiment
The present invention is described in further detail below in conjunction with concrete drawings and Examples, and the explanation of the invention is not limited.
The used bamboo pulp green liquor of the present invention is that its composition is between soda pulping process factory alkali recovery vehicle: total alkali 137.21g/L, active alkali 39.88g/L, Na
2CO
397.27g/L, Na
2S31.94g/L, SiO
24.36g/L the pH value of green liquor is 13.54.
A kind of sodium bentonite that utilizes may further comprise the steps the method for the pre-silica removal of bamboo pulp green liquor:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:32, in sodium bentonite, add water, after the mixing, fully stir 5min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 5min after, leave standstill 15min, filter then, get filtrate, namely obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite dry ground in the sodium bentonite slip are 45.7.
Embodiment 2
A kind of sodium bentonite that utilizes may further comprise the steps the method for the pre-silica removal of bamboo pulp green liquor:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:15, in sodium bentonite, add water, behind the mixing, fully stir 8min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 8min after, leave standstill 15min, filter then, get filtrate, namely obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite dry ground in the sodium bentonite slip are 45.7.
Embodiment 3
A kind of sodium bentonite that utilizes may further comprise the steps the method for the pre-silica removal of bamboo pulp green liquor:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:25, in sodium bentonite, add water, behind the mixing, fully stir 10min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 5min after, leave standstill 20min, filter then, get filtrate, namely obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite dry ground in the sodium bentonite slip are 30.
Embodiment 4
A kind of sodium bentonite that utilizes may further comprise the steps the method for the pre-silica removal of bamboo pulp green liquor:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:8, in sodium bentonite, add water, behind the mixing, fully stir 10min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 10min after, leave standstill 25min, filter then, get filtrate, namely obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite dry ground in the sodium bentonite slip are 50;
Bamboo pulp green liquor after the pre-silica removal that 3) will obtain is handled is sent into silica removal workshop section, and the precipitation that filtration obtains is sent into washing room, and washing and recycling obtains sodium bentonite, and sodium bentonite can reuse.
The silica removal compliance test result experiment of sodium bentonite of the present invention is as follows:
1, screening bentonite
In experiment, choose 3 kinds of different classes of bentonites and compared research, take by weighing the original soil of 3.125g, white bentonite and sodium bentonite respectively, and place 3 100ml beakers, add 100mL distilled water, stir 5min after, respectively add 9.70g sodium carbonate in 3 beakers and 3.1g vulcanized sodium (disturbs in order to get rid of other elements, only simulate the alkalescence of bamboo pulp green liquor), and add a spot of Fe
2+Be used for detecting three kinds of bentonitic adsorption capacities, continue to stir 5min, three kinds are poured into mixed liquor respectively in three 100mL graduated cylinders, survey its sinking speed and leave standstill 24h, read expansion capacity, referring to Fig. 1, from Fig. 1, as can be seen, three kinds of bentonitic expanding volume contrasts, in identical time of repose, the expanding volume of sodium bentonite is maximum relatively, therefore screens sodium bentonite as pre-desiliconizing agent of the present invention.
2, the adsorption test of sodium bentonite
Water and sodium bentonite are pressed mass ratio 2,4,8,16,32,64 ratio, be configured to the sodium bentonite slip respectively, pour in the alkali lye more respectively then, the alkali lye pH value that can find by experiment to add behind the sodium bentonite slip is almost constant, after leaving standstill 24h, can find, sodium bentonite becomes fluffy green soil layer and is distributed in the graduated cylinder uniformly, in alkali lye, will settle down after the nonferrous metal ion absorption after this explanation sodium bentonite imbibition, has absorption property preferably, constant after the increase increase earlier of the expansion capacity of sodium bentonite along with amount of water, and as can be known from Fig. 2, when the water addition ratio example is water: during sodium bentonite=32:1, the expansion capacity maximum of sodium bentonite, expansion effect is best.
3, silica removal testing experiment
Press water: the mass ratio of sodium bentonite=32:1, preparation sodium bentonite slip, the sodium bentonite slip is added in the simulation solution with the identical alkali content of bamboo pulp green liquor, wherein, the mass ratio of simulation solution and sodium bentonite dry ground is 45.7, after stirring 5min, leave standstill 20min, suction filtration, get the filtrate crystallization and evaporation, measure by Fourier infrared spectrograph, infrared spectrogram result as shown in Figure 3, as can be seen, do not find the corresponding peak of Si-O, can prove that sodium bentonite is no element silicon stripping in strong alkali solution, can further specify sodium bentonite and can be used to do pre-desiliconizing agent.
4, measure the forward and backward silicone content test of silica removal
Press water: the mass ratio of sodium bentonite=32:1, sodium bentonite is added to the water, fully stirs 5min, make its swollen after, pour into again in the pending bamboo pulp green liquor, (wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite dry ground in the sodium bentonite slip are 45.7) fully stirs 5min, after leaving standstill 20min, suction filtration washs reuse with sediment, and clear liquid is measured silicone content with the silicon molybdenum blue method.By measuring, the silicone content that does not add in the bamboo pulp green liquor before sodium bentonite is handled is 0.25%, is 0.123% through the pretreated silicone content of sodium bentonite, and pre-silica removal rate can reach 50.8%, illustrates that pre-silica removal effectiveness is comparatively obvious.
5, element silicon spectroscopy detection test
Press water: the mass ratio of sodium bentonite=32:1, sodium bentonite is added to the water, fully stirs 5min, make its swollen after, pour into again in the pending bamboo pulp green liquor, (wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite dry ground in the sodium bentonite slip are 45.7) fully stirs 5min, after leaving standstill 20min, suction filtration washs reuse with sediment, the filtrate crystallization and evaporation, utilize energy disperse spectroscopy to carry out spectroscopy detection, power spectrum result contrasts a and b, as can be seen as shown in Figure 4, after pre-silica removal is handled, the peak of element silicon significantly decreases, and is same, illustrated that also sodium bentonite has pre-silica removal effectiveness.
In sum, agent is subjected to domestic and international efforts at environmental protection person's attention to bentonite as Industrial Wastewater Treatment, factory handles waste water through its powerful physical absorption ability commonly used, and absorption bentonite later can be recycled, and meets the strategic objective of national sustainable development more.Sodium bentonite is a kind of in the bentonite, be according to exchangeable cations kind between montmorillonite layer, content is divided, alkalescence coefficient more than or equal to 1 be sodium bentonite, the present invention is by screening, obtain good pre-desiliconizing agent---sodium bentonite, its be a kind of be the clay pit of main component with the montmorillonite, reserves are abundant, and are cheap, have very big specific area, can produce huge surface can, thereby have stronger adsorption capacity, the expansion capacity of sodium bentonite can reach 48mL in strong alkali solution, and wherein silicon alkali resistant dissolubility is extremely strong, when the sodium bentonite consumption is 0.3%, pre-silica removal rate is 50.8%, and sodium bentonite still has suction-operated behind washing and filtering, can add when green liquor clarification, therefore in clarification, reach the effect of silica removal, alleviated follow-up workshop section silica removal load.
Claims (6)
1. sodium bentonite is characterized in that the method for the pre-silica removal of bamboo pulp green liquor, may further comprise the steps:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:8～64, in sodium bentonite, add water, after the mixing, fully stir 5～10min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 5～10min after, leave standstill, cross leaching filtrate then, obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp filtrate and the mass ratio of the sodium bentonite in the sodium bentonite slip are 30～50:1.
2. sodium bentonite according to claim 1 is characterized in that the method for the pre-silica removal of bamboo pulp green liquor, may further comprise the steps:
1) get sodium bentonite, press sodium bentonite: the mass ratio of water=1:32, in sodium bentonite, add water, after the mixing, fully stir 5min, obtain the sodium bentonite slip;
2) the sodium bentonite slip is added pending bamboo pulp green liquor, fully stir 5min after, leave standstill, filter then, get filtrate, obtain the bamboo pulp green liquor after pre-silica removal is handled; Wherein, pending bamboo pulp green liquor and the mass ratio of the sodium bentonite in the sodium bentonite slip are 45.7.
3. sodium bentonite according to claim 1 and 2 is characterized in that step 2 to the method for the pre-silica removal of bamboo pulp green liquor) described time of repose is 15～25min.
4. sodium bentonite according to claim 1 is to the method for the pre-silica removal of bamboo pulp green liquor, it is characterized in that, comprise that also the bamboo pulp green liquor after the pre-silica removal processing that will obtain is sent into silica removal workshop section, the precipitation that filtration obtains is sent into washing room, washing and recycling obtains sodium bentonite.
5. sodium bentonite is as the application of the pre-desiliconizing agent of papermaking bamboo pulp green liquor.
6. the application of sodium bentonite in the pre-desiliconizing agent of preparation papermaking bamboo pulp green liquor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907059A (en) * | 2015-05-20 | 2015-09-16 | 陕西科技大学 | Desorption regeneration method for silicon trapping agent in alkali-recovery workshop section |
| CN106283787A (en) * | 2016-09-05 | 2017-01-04 | 陕西科技大学 | A kind of method suppressing sulfate process bamboo wood slurrying silicon dissolution |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060225852A1 (en) * | 2005-04-11 | 2006-10-12 | Jan Pekarovic | Process for removing silica from cellulosic material |
| CN102337696A (en) * | 2011-10-31 | 2012-02-01 | 陕西科技大学 | Method for removing silicon in green liquid through cooperation of calcium oxide and aluminum salt |
-
2013
- 2013-06-28 CN CN2013102677002A patent/CN103334329A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060225852A1 (en) * | 2005-04-11 | 2006-10-12 | Jan Pekarovic | Process for removing silica from cellulosic material |
| CN102337696A (en) * | 2011-10-31 | 2012-02-01 | 陕西科技大学 | Method for removing silicon in green liquid through cooperation of calcium oxide and aluminum salt |
Non-Patent Citations (6)
| Title |
|---|
| 刘娜等: "膨润土在造纸工业中的应用于开发前景", 《纸和造纸》, no. 2, 31 March 2003 (2003-03-31) * |
| 张陶芸: "草浆黑液硅干扰及除硅技术", 《纸和造纸》, no. 4, 31 July 1999 (1999-07-31) * |
| 徐同台等: "《钻井工程井壁稳定新技术》", 30 September 1999, article "硅酸盐稳定粘土作用机理研究" * |
| 徐永建等: "竹浆碱回收绿液铝盐法除硅研究", 《中国造纸》, vol. 32, no. 1, 31 January 2013 (2013-01-31) * |
| 杨久义等: "用膨润土制备造纸废水处理用混凝剂的研究", 《非金属矿》, vol. 27, no. 1, 31 January 2004 (2004-01-31) * |
| 赵丽红: "膨润土的特点及其在造纸工业中的应用", 《中国造纸》, vol. 23, no. 10, 31 October 2004 (2004-10-31) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907059A (en) * | 2015-05-20 | 2015-09-16 | 陕西科技大学 | Desorption regeneration method for silicon trapping agent in alkali-recovery workshop section |
| CN106283787A (en) * | 2016-09-05 | 2017-01-04 | 陕西科技大学 | A kind of method suppressing sulfate process bamboo wood slurrying silicon dissolution |
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Application publication date: 20131002 |