CN102337690B - Pulping method for stewing bamboo material by using aluminum salt and retaining silicon at same time - Google Patents

Pulping method for stewing bamboo material by using aluminum salt and retaining silicon at same time Download PDF

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CN102337690B
CN102337690B CN 201110338151 CN201110338151A CN102337690B CN 102337690 B CN102337690 B CN 102337690B CN 201110338151 CN201110338151 CN 201110338151 CN 201110338151 A CN201110338151 A CN 201110338151A CN 102337690 B CN102337690 B CN 102337690B
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silicon
bamboo
sodium
boiling
bamboo chip
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CN102337690A (en
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徐永建
唐凌云
田勇
朱振峰
张美云
张鼎军
易贻端
郭端华
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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Abstract

The invention relates to a pulping method for stewing bamboo material by using aluminum salt and retaining silicon at the same time, which comprises the following steps: adding solid sodium sulfide, aluminum sulfate, aluminum oxide, calcium oxide or sodium metaaluminate into a sodium hydroxide solution, and uniformly mixing to prepare a boiling liquid; and adding the uniformly mixed boiling liquid into a bamboo strip, boiling, and then spraying and discharging. In the invention, the aluminum sulfate, aluminum oxide, calcium oxide or sodium metaaluminate is added before boiling, and then, boiling is carried out. Experimental researches show that silicon in the bamboo material can be continually dissolved out in an alkaline solution, the alkaline solution continually enters cells at the same time, the silicon dissolved out reacts with the alkaline solution to generate sodium silicate, and the sodium silicate further reacts with the aluminum salt to generate precipitate similar to zeolite; and such precipitate has high adsorbability and can be adsorbed on the surface or at the inside of fibers, thereby preventing the silicon in the material from being dissolved in the alkaline solution and then transferred to a black liquid. Thus, majority of the silicon in the material can be retained on the surface or at the inside of fibers, thereby reducing the content of silicon oxide in the black liquid.

Description

The synchronous precipitating-silica pulping method of bamboo pulp aluminium salt boiling
Technical field
The invention belongs to the pulping process of paper industry, be specifically related to the synchronous precipitating-silica pulping method of a kind of bamboo pulp aluminium salt boiling.
Background technology
Non-wood material occupies important proportion in China's pulping and paper-making, wherein bamboo class raw material has the advantages such as average fiber length is long, growth cycle is short, but the reason owing to bamboo class raw material self, hemicellulose level in the body is high, dioxide-containing silica accounts for 0.8~1.3% of dry weight, also produces easily " silicon interference ", and the existence of silica makes black liquor increase fast in the increase of evaporation process medium viscosity with concentration, thereby affect the evaporation of black liquor, the easy fouling of black liquor; Because the fusing point of sodium metasilicate is high, causes the higher temperature of black-liquor combustion needs and energy consumption; Green liquor mesosilicic acid sodium forms calcium silicates in the causticization process, the sad filter of the fine and smooth difficult precipitation of particle causes white clay washing difficulty, and the residual alkali number of white clay is high, and alkali runs off large; The calcium silicates of white clay makes burning of lime sludge recovery lime need very high energy consumption.
At present carried out a large amount of research for " silicon interference " problem of bamboo wood black digestion liquid both at home and abroad.The silicon removing process that proposes has following several: it is the technique of before the boiling bamboo chip being carried out alkali preliminary treatment silica removal that the preliminary treatment of bamboo chip alkali removes silicon technology, and this technique is got the raw materials ready loss greatly, and the preliminary treatment thermal energy consumption is large, and waste liquid can't be processed and cause new environmental pollution; Black liquor calcium salt silica removal is to add the purpose that lime reaches silica removal in black liquor, but this technique is discharged about 1/3~1/2 causticization white clay total amount, not only causes alkali loss but also causes new solid waste pollution; Two sections causticization silicon removing process can be removed about 56% silicon, but two step causticization silicon removing process will increase a cover causticization flow process newly, 30% efflux white clay and can cause environmental pollution equally; Although green liquor carbonating silicon removing process can effectively be removed silicon, owing in the silica removal process, cause the pH value to change greatly, need stripping to recover just can send into the causticization section after original character, and can cause the loss of sulphur; The clearance of the saturated carbon dioxide silicon removing process of rare black liquor silicon is higher, but system complex, and must the supplemental hydrogen sodium oxide molybdena behind silica removal to improve black liquor pH value; Dense saturated rare black liquor silicon removing technique silica removal effect is better, but needs a newly-increased cover carbon dioxide generating device, and exists black liquor to replenish the problem of alkali.Above method all solves " silicon interference " problem from the source, and investment that can increase equipment etc.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of bamboo pulp aluminium salt boiling synchronous precipitating-silica pulping method, namely be before boiling, to add aluminium salt to cooking liquor, bamboo has suppressed the transfer of silicon in the black liquor in the boiling delignification, reduced the dioxide-containing silica in the black liquor.
For achieving the above object, the technical solution used in the present invention is:
1) bamboo is cut into 25~30mm length, the wide bamboo chip of 3~5mm, the concentration of then getting bamboo chip dry weight 22~25% is the sodium hydroxide solution of 120~130g/L, and 6~6.25% vulcanized sodium, 0~3% calcium oxide and 0.5~1% aluminium salt stir and makes cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1: 4.5~5.5, rises from room temperature and is warming up to 150 ℃~160 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.
Described aluminium salt is one or more the mixture in sodium metaaluminate solid, aluminum sulfate or the aluminium oxide.
The present invention is directed to conventional bamboo wood sulfate pulping and proposed the pulping process that silicon is stayed in a kind of new boiling synchronously, namely is to add aluminium salt before boiling, then carries out boiling.Experimental studies have found that the silicon continuous stripping of meeting in alkaline solution in the bamboo raw material, alkaline solution constantly enters in the cell simultaneously, the silicon of stripping and alkaline solution reaction generate sodium metasilicate, sodium metasilicate further generates the sediment of similar zeolite with the aluminium reactant salt, this sediment has absorption property, can be adsorbed on fiber surface or inside, having stoped the silicon in the raw material to be dissolved in the backward black liquor of alkali lye shifts, silicon major part in the raw material has been stayed fiber surface and inside like this, and then has reduced the content of silica in the black liquor.Another one characteristics of the present invention be aluminium salt selection and composite on, multiple aluminium salt is better than single aluminium salt.The synchronous precipitating-silica pulping method technological operation of aluminium salt boiling is convenient, does not need existing equipment adjusted greatly to organize production; The aluminium salt source of adding simultaneously is abundant.
The specific embodiment
Embodiment 1:1) bamboo is cut into long, the wide bamboo chip of 3~5mm of 25~30mm, the concentration of then getting bamboo chip dry weight 22% is the sodium hydroxide solution of 120g/L, and 6% vulcanized sodium and 0.5% sodium metaaluminate solid stir and make cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1: 4.5, rises from room temperature and is warming up to 150 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.Stay the silicon effect with paper pulp screened yield, kappa value, slurry ash content and dioxide-containing silica, the leading indicators such as black liquor dioxide-containing silica represent.Screened yield 43.56%, kappa value 25, slurry ash content 1.35%, slurry dioxide-containing silica 0.65%, black liquor dioxide-containing silica 0.25%.
Embodiment 2:1) bamboo is cut into long, the wide bamboo chip of 3~5mm of 25~30mm, the concentration of then getting bamboo chip dry weight 23% is the sodium hydroxide solution of 125g/L, and 6.25% vulcanized sodium, 1% calcium oxide and 0.8% aluminum sulfate stir and makes cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1: 5, rises from room temperature and is warming up to 155 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.Stay the silicon effect with paper pulp screened yield, kappa value, slurry ash content and dioxide-containing silica, the leading indicators such as black liquor dioxide-containing silica represent.Screened yield 43.78%, kappa value 26, slurry ash content 1.45%, slurry dioxide-containing silica 0.69%, black liquor dioxide-containing silica 0.28%.
Embodiment 3:1) bamboo is cut into long, the wide bamboo chip of 3~5mm of 25~30mm, the concentration of then getting bamboo chip dry weight 24% is the sodium hydroxide solution of 125g/L, and 6% vulcanized sodium, 3% calcium oxide and 0.6% aluminium oxide stir and make cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1: 5.5, rises from room temperature and is warming up to 160 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.Stay the silicon effect with paper pulp screened yield, kappa value, slurry ash content and dioxide-containing silica, the leading indicators such as black liquor dioxide-containing silica represent.Screened yield 44.25%, kappa value 25, slurry ash content 1.50%, slurry dioxide-containing silica 0.72%, black liquor dioxide-containing silica 0.24%.
Embodiment 4:1) bamboo is cut into 25~30mm length, the wide bamboo chip of 3~5mm, the concentration of then getting bamboo chip dry weight 25% is the sodium hydroxide solution of 130g/L, and 6.10% vulcanized sodium, 1.5% calcium oxide, 0.3% sodium metaaluminate solid and 0.6% aluminum sulfate stir and makes cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1: 4.8, rises from room temperature and is warming up to 153 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.Stay the silicon effect with paper pulp screened yield, kappa value, slurry ash content and dioxide-containing silica, the leading indicators such as black liquor dioxide-containing silica represent.Screened yield 43.55%, kappa value 25, slurry ash content 1.38%, slurry dioxide-containing silica 0.64%, black liquor dioxide-containing silica 0.30%.
Embodiment 5:1) bamboo is cut into 25~30mm length, the wide bamboo chip of 3~5mm, the concentration of then getting bamboo chip dry weight 23.5% is the sodium hydroxide solution of 123g/L, and 6.15% vulcanized sodium, 2.5% calcium oxide, 0.4% sodium metaaluminate solid and 0.3% aluminium oxide stir and make cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1: 5.2, rises from room temperature and is warming up to 157 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.Stay the silicon effect with paper pulp screened yield, kappa value, slurry ash content and dioxide-containing silica, the leading indicators such as black liquor dioxide-containing silica represent.Screened yield 43.65%, kappa value 25, slurry ash content 1.48%, slurry dioxide-containing silica 0.74%, black liquor dioxide-containing silica 0.32%.
Embodiment 6:1) bamboo is cut into 25~30mm length, the wide bamboo chip of 3~5mm, the concentration of then getting bamboo chip dry weight 24.5% is the sodium hydroxide solution of 128g/L, and 6.25% vulcanized sodium, 2% calcium oxide, 0.2% sodium metaaluminate solid, 0.3% aluminum sulfate and 0.5% aluminium oxide stir and make cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1: 5.4, rises from room temperature and is warming up to 159 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.Stay the silicon effect with paper pulp screened yield, kappa value, slurry ash content and dioxide-containing silica, the leading indicators such as black liquor dioxide-containing silica represent.Screened yield 43.55%, kappa value 25, slurry ash content 1.43%, slurry dioxide-containing silica 0.66%, black liquor dioxide-containing silica 0.26%.

Claims (1)

1. the synchronous precipitating-silica pulping method of bamboo pulp aluminium salt boiling is characterized in that:
1) bamboo is cut into 25~30mm length, the wide bamboo chip of 3~5mm, the concentration of then getting bamboo chip dry weight 22~25% is the sodium hydroxide solution of 120~130g/L, and the mixture of one or more in 6~6.25% vulcanized sodium, 0~3% calcium oxide and 0.5~1% sodium metaaluminate solid, aluminum sulfate or the aluminium oxide stirs and makes cooking liquor;
2) cooking liquor is joined in the bamboo chip, the mass ratio that adds again entry adjusting bamboo chip and liquid is 1:4.5~5.5, rises from room temperature and is warming up to 150 ℃~160 ℃ at 150 minutes, is incubated 60 minutes the batch turning of spurting under maximum temperature.
CN 201110338151 2011-10-31 2011-10-31 Pulping method for stewing bamboo material by using aluminum salt and retaining silicon at same time Active CN102337690B (en)

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CN102877361A (en) * 2012-09-28 2013-01-16 湖南文理学院 Silicon retention agent for pulping by grass materials and cooking method
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
CN112080957A (en) * 2020-09-18 2020-12-15 广东鼎丰纸业有限公司 High-efficiency caustic soda anthraquinone cooking aid and preparation method thereof

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GB381697A (en) * 1931-09-19 1932-10-13 Erik Ludvig Rinman Method of relieving alkaline waste liquors from the soda or sulphate pulp manufacture, of silica
CN1042964C (en) * 1993-12-01 1999-04-14 北京轻工业学院 Straw pulp black liquor silicon removing method

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