CN101177264A - Method for combined production of activative carbon, white carbon black and soda by employing biomass power plant waste - Google Patents
Method for combined production of activative carbon, white carbon black and soda by employing biomass power plant waste Download PDFInfo
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- CN101177264A CN101177264A CNA2007100537172A CN200710053717A CN101177264A CN 101177264 A CN101177264 A CN 101177264A CN A2007100537172 A CNA2007100537172 A CN A2007100537172A CN 200710053717 A CN200710053717 A CN 200710053717A CN 101177264 A CN101177264 A CN 101177264A
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 87
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000002028 Biomass Substances 0.000 title claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 24
- 239000006229 carbon black Substances 0.000 title claims description 36
- 239000010908 plant waste Substances 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- 230000003213 activating effect Effects 0.000 title 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Substances [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 58
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 48
- 241000209094 Oryza Species 0.000 claims abstract description 45
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 45
- 235000009566 rice Nutrition 0.000 claims abstract description 45
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 42
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 23
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 18
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003546 flue gas Substances 0.000 claims abstract description 15
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 10
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 6
- 239000010903 husk Substances 0.000 claims abstract description 6
- 235000017550 sodium carbonate Nutrition 0.000 claims description 40
- 235000011089 carbon dioxide Nutrition 0.000 claims description 36
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 26
- 238000000855 fermentation Methods 0.000 claims description 23
- 230000004151 fermentation Effects 0.000 claims description 23
- 239000000047 product Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 238000001556 precipitation Methods 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 11
- 230000029087 digestion Effects 0.000 claims description 9
- 230000008929 regeneration Effects 0.000 claims description 8
- 238000011069 regeneration method Methods 0.000 claims description 8
- 229960001866 silicon dioxide Drugs 0.000 claims description 8
- 208000005156 Dehydration Diseases 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000018044 dehydration Effects 0.000 claims description 7
- 238000006297 dehydration reaction Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- 238000010298 pulverizing process Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 239000012065 filter cake Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000007790 solid phase Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 9
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- 238000004062 sedimentation Methods 0.000 abstract 2
- 238000010000 carbonizing Methods 0.000 abstract 1
- 238000002386 leaching Methods 0.000 abstract 1
- 235000019241 carbon black Nutrition 0.000 description 25
- 235000011121 sodium hydroxide Nutrition 0.000 description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 235000019738 Limestone Nutrition 0.000 description 3
- ZZVUWRFHKOJYTH-UHFFFAOYSA-N diphenhydramine Chemical compound C=1C=CC=CC=1C(OCCN(C)C)C1=CC=CC=C1 ZZVUWRFHKOJYTH-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241000872198 Serjania polyphylla Species 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
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- 235000012204 lemonade/lime carbonate Nutrition 0.000 description 2
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- 238000005201 scrubbing Methods 0.000 description 2
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- MTJGVAJYTOXFJH-UHFFFAOYSA-N 3-aminonaphthalene-1,5-disulfonic acid Chemical compound C1=CC=C(S(O)(=O)=O)C2=CC(N)=CC(S(O)(=O)=O)=C21 MTJGVAJYTOXFJH-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 241001314440 Triphora trianthophoros Species 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
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- 239000003337 fertilizer Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010795 gaseous waste Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- 230000007935 neutral effect Effects 0.000 description 1
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- 229940034610 toothpaste Drugs 0.000 description 1
- 239000000606 toothpaste Substances 0.000 description 1
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Abstract
The invention relates to a combined producing method of active carbon, silica hydrated and soda with the waste of biomass power plant, which comprises the following steps: firstly, immersing and leaching the ash of rice husk of the power plant with lye to generate sodium silicate solution or sol and insoluble substance; secondly, separating the sodium silicate solution or sol from the insoluble substance, and carbonizing and neutralizing the sodium silicate solution or sol with the carbon dioxide recovered from the flue gas of the power plant to generate sedimentation of silicon dioxide and sodium carbonate solution; finally, preparing active carbon, silica and soda with the insoluble substance, the sedimentation of silicon dioxide and the sodium carbonate solution. The invention has the advantages that the ash of rice husk can be fully utilized, the carbon dioxide in the flue gas can be reasonably utilized, thereby the power plant has a great progress toward the target of zero draining, and the production cost and the energy consumption are reduced greatly, and the profit is increased obviously, and the invention has the great social and economic benefit.
Description
Technical field
The present invention relates to the comprehensive utilization technique of biomass fermentation power plant waste, refer to a kind of method of utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash particularly.
Background technology
Based on the more and more shortage of natural energy sources such as the coal on the our times, oil, the scientific and technical personnel of various countries adopt biomass to replace the coal equal energy source in research and generate electricity.With China is example, has set up the biomass fermentation power plant that tens of families adopt the generating of rice husk class material.These biomass fermentation power plant can generate a large amount of rice hull ash and stack gas the like waste when combusting rice hull obtains clean electric energy.At present, for the processing of rice hull ash class waste, general's part wherein is as agricultural fertilizer usually for people, and also some is used for repairing the roads as filler, and the rice hull ash that major part can't be handled then directly is dropped.For the processing of stack gas, generally be through all emptying after the simple desulfurization, be easy to cause topsoil.In a word, the waste rice hull ash and the stack gas of existing biomass fermentation power plant are not all effectively administered.
In order effectively to utilize rice hull ash, scientific and technical personnel find that through further investigation the major ingredient in the rice hull ash is a silicon-dioxide, silicon-dioxide can be extracted the industrial white carbon black of preparation.At present, the production technique of white carbon black generally is that the employing natural siliceous sand is a raw material, become silicon-dioxide and make white carbon black through pyrolytic decomposition, but this arts demand cost lot of energy, production cost is higher.The technology of producing white carbon black with rice hull ash has many research in China, generally is earlier with the rice hull ash dipping by lye, adopts hydrochloric acid or sulfuric acid neutral method that the dipping by lye thing is carried out acidification then, obtains producing the raw material of white carbon black.Because strong acid, highly basic in this technological process are indispensable, particularly strong acid enter indispensablely, both increased industrial hazard level, also enlarged the severity of environmental pollution.Simultaneously, its production efficiency is low, and product structure is single, has only white carbon black a kind of, and waste of raw materials is big.
Produce white carbon black with rice hull ash and study, and finished breadboard little cut-and-try work in India Lei Jisite academy of sciences.The design of this experiment is to soak rice hull ash with caustic soda, as the acidifying medium, soak is carried out acidification with carbonic acid gas, generates silicon-dioxide and sodium carbonate solution, and after separating, solid is a silicon-dioxide, and liquid is sodium carbonate solution.In liquid, feed liming then, generate lime carbonate and sodium hydroxide solution.With its separation, operation went to soak rice hull ash before sodium hydroxide solution was delivered to again, and lime carbonate then with the limestone kiln calcining, resolves into calcium oxide and carbonic acid gas.Its design embedding claims a perfectly circulation, adopts the method for limestone calcination to produce carbonic acid gas unfortunately, not only can make waste gas and dust form vicious cycle, pollute even more seriously because of the appearance in limestone kiln, and can increase a large amount of energy consumptions.Secondly, for uninterrupted circulation, the soda ash that is generated has also been slatterned.
Summary of the invention
Purpose of the present invention aims to provide a kind of method of utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash.It is by fully utilizing rice hull ash and stack gas that power plant burning produced, the waste of biomass fermentation power plant is turned waste into wealth, gas discharging in flue greenhouse significantly reduces, really becomes an environment-friendly type power station.
For achieving the above object, the method of utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash that the present invention is designed, be the process that rice hull ash that power plant burning rice husk biolobic material is produced and stack gas are carried out comprehensive treating process, this method comprises the steps:
1) digestion rice hull ash: with the rice hull ash that above-mentioned burning was produced is raw material, is solvent with the sodium hydroxide solution, makes rice hull ash that chemical reaction take place in sodium hydroxide solution, obtains the solid-liquid mixture of sodium silicate solution or colloidal sol and insolubles;
2) separate solid-liquid mixture: the solid-liquid mixture that step 1) obtained is carried out filtration treatment, the sodium silicate solution of liquid phase or the insolubles of colloidal sol and solid phase are separated;
3) preparation gac: to step 2) the insolubles filter cake that is obtained carries out pickling, uses hot wash then, passes through centrifuge dehydration, high temperature drying, air cooling, pulverizing and/or forming processes again, obtains active carbon finished products;
4) reclaim carbonic acid gas: with the flue gas that above-mentioned burning was produced is raw material, adopting existing any sulfur removal technology that flue gas is carried out desulfurization earlier handles, adopt MEA (a hydramine) method to absorb carbonic acid gas in the flue gas then, to be absorbed with the solution thermal regeneration of carbonic acid gas again, and make the carbonic acid gas in the solution parse standby;
5) sic acid sodium: the carbonic acid gas that step 4) reclaimed is passed into step 2) in the sodium silicate solution or colloidal sol that is obtained, make sodium silicate solution or colloidal sol and carbonic acid gas generation acidifying neutralization reaction, generate the solidliquid mixture of precipitation of silica and sodium carbonate solution;
6) separate silicon-dioxide: the solidliquid mixture that step 5) generated is carried out filtration treatment, wherein precipitation of silica and sodium carbonate solution are separated;
7) preparation white carbon black: to the isolated precipitation of silica of step 6) wash, drying and pulverization process, acquisition white carbon black finished product;
8) preparation soda ash: the isolated sodium carbonate solution of step 6) is carried out centrifugal dehydration treatment,, obtain technical grade soda ash finished product again through calcining.
Above-mentioned steps 1) in, the preferred mass percentage concentration is 10～35% sodium hydroxide solution, it in the volume ratio of sodium hydroxide solution and rice hull ash 1: 1～3 ratio, in digestion temperature is that 85～90 ℃, digestion time are under the condition of 1～3h, make rice hull ash that sufficient chemical reaction take place in sodium hydroxide solution, effective ingredient wherein is fully utilized.Its chemical equation is as follows:
2NaOH+ rice hull ash=Na
2SiO
3+ H
2The O+ insolubles
Above-mentioned steps 3) in, the preferred mass percentage concentration is 20～30% hydrochloric acid soln, 25% hydrochloric acid soln preferably, in the volume ratio of hydrochloric acid soln and insolubles is 4～6: 1 ratio, 5: 1 ratio preferably, to step 2) the insolubles filter cake that obtained carries out pickling, until its pH value=6.8～6.9; Use the hot water repetitive scrubbing then, till its pH value=7.0; Pass through centrifuge dehydration, 650 ℃ of left and right sides high temperature drying 15～18min, airflow cooling, pulverizing and/or forming processes again, can obtain that foreign matter content is low, hygienic standard is high, specific surface area reaches 1000～3000m
2The active carbon finished products of/g.
Above-mentioned steps 4) in, flue gas can be cooled to then it is pressurized to 600mmH below 40 ℃
2About the O post, adopt lime or gac dry desulfurization, make amount of sulfur contenting in smoke less than 5mg/Nm
3Adopt present popular MEA (a hydramine) method to remove the carbonic acid gas in the flue gas again, absorption temperature is 40 ℃; Solution with absorbing carbon dioxide carries out thermal regeneration at last, and regeneration temperature is 104～110 ℃, makes purity reach 90～99% carbonic acid gas and parses standby from absorbent solution.
Above-mentioned steps 5) in, be 0.1～0.3Mpa, 0.2Mpa preferably preferably at carbonic acid gas air pressure, design temperature is 85～95 ℃, preferably 90 ℃, reaction times is 1～3h, preferably under the condition of 2.5h, make sodium silicate solution or colloidal sol and carbonic acid gas that sufficient acidifying neutralization reaction take place, to generate precipitation of silica and sodium carbonate solution as much as possible, lay a solid foundation for preparing white carbon black and soda ash.Its chemical equation is as follows:
Na
2SiO
3+CO
2＝Na
2CO
3+SiO
2
The present invention is leached the rice hull ash that power plant burning generated with alkali lye after, use the carbonic acid gas that from power station stack gas, reclaims to carry out carbonization (acidifying) neutralizing treatment again, charcoal insolubles, precipitation of silica and the sodium carbonate solution that is obtained is respectively applied for preparation gac, white carbon black and soda ash, and its advantage is:
One, adopt carbonic acid gas as the acidifying neutralization medium, carbonic acid gas is taken to the stack gases in power station, not only raw materials cost is extremely low, there is sufficient assurance in the source, and replace sulfuric acid or hydrochloric acid with carbonic acid gas, in technological operation, got rid of the intervention of strong acid, avoided sulfuric acid or hydrochloric acid many danger and potential safety hazard and the pollution of environment in transportation, in storing and producing.Factory with 30,000 tons of annual output white carbon blacks is an example, can save about 1.6 ten thousand tons of sulfuric acid or hydrochloric acid every year.
Two, rice hull ash and stack gas are turned waste into wealth, not only can obtain industrial gac and white carbon black, and increased the soda ash product newly, killing three birds with one stone has significantly increased the economic benefit in power station.Be example still, can increase about 1.5 ten thousand tons of soda ash product every year, about 2000～3,000 ten thousand yuan of income with the factory that produces 30000 tons of white carbon blacks per year.
Three, the reasonable utilization of a large amount of stack gases significantly reduces the greenhouse gases carbonic acid gas and the sulfurous gas in power station, has effectively reduced the discharging of industrial gaseous waste, makes the power station become the cleaning factory of an environment-friendly type.Be example also, can reduce the discharging carbon dioxide every year near 10000 tons with the factory that produces 30000 tons of white carbon blacks per year.
In sum, the waste of a biomass fermentation power plant can obtain three Industrial products through after the comprehensive treating process: white carbon black can supply the usefulness of multiple industry such as rubber, plastics, paint, toothpaste, catalyzer, insulation, water conditioning; Soda ash also is the indispensable basic chemical raw materials of national economy, can also obtain the activated carbon product of some amount in addition.Therefore, the rice hull ash of power plant burning can be fully exploited, partial CO 2 gas in the flue tail gas also can obtain reasonable use, the power station is put to the zero-emission target stepped major step, and production cost of products and energy consumption have significantly been reduced, significantly increase the profit in power station, had important social benefit and economic benefit.
Description of drawings
Accompanying drawing is a kind of process flow diagram that utilizes the method for biomass fermentation power plant Litter co-producing active carbon, white carbon black and soda ash.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Utilize the technical process of biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash shown in the accompanying drawing, comprise the steps:
1) digestion rice hull ash: getting the rice hull ash of carbonaceous amount content about 30% that biomass fermentation power plant combusting rice hull produced is raw material, with mass percent concentration is that 20～25% sodium hydroxide solution is a solvent, in the volume ratio of sodium hydroxide solution and rice hull ash is that 1: 2～2.5 ratio mixes it, be condition digestion 1.5～2.5h of 85～90 ℃ then in digestion temperature, make rice hull ash that sufficient chemical reaction take place in sodium hydroxide solution, obtain the solid-liquid mixture of sodium silicate solution or colloidal sol and insolubles.
2) separate solid-liquid mixture: the solid-liquid mixture that step 1) obtained is carried out filtration treatment, the sodium silicate solution of liquid phase or the insolubles of colloidal sol and solid phase are separated.
3) preparation gac: adopting mass percent concentration is 25% hydrochloric acid soln, is 5: 1 ratio in the volume ratio of hydrochloric acid soln and insolubles, to step 2) the insolubles filter cake that obtained carries out pickling, until its pH value=6.8～6.9; Use the hot water repetitive scrubbing then, till its pH value=7.0; Through centrifugal dehydration treatment, 650 ℃ of left and right sides high temperature drying 15～18min, airflow cooling, pulverization process, can obtain active carbon finished products again.Extremely low, the specific surface area of its foreign matter content is at 1600～2700m after testing
2In the scope of/g.
4) reclaim carbonic acid gas: the flue gas that is produced with biomass fermentation power plant combusting rice hull is a raw material, earlier flue gas is cooled to then it is pressurized to 600mmH below 40 ℃
2The O post adopts traditional lime or gac dry desulfurization, makes the outlet amount of sulfur contenting in smoke less than 5mg/Nm
3Adopt sophisticated MEA (a hydramine) method to remove the carbonic acid gas in the flue gas again, its absorption temperature is about 40 ℃; Solution with absorbing carbon dioxide carries out thermal regeneration at last, and the thermal regeneration temperature is about 104～110 ℃, and carbonic acid gas is parsed from solution, and its purity can reach 90～99%.
5) sic acid sodium: the carbonic acid gas that step 4) reclaimed is passed into step 2) in the sodium silicate solution or colloidal sol that is obtained, can externally be provided with in the carbonating tower of recirculation heater and carry out, setting temperature of reaction and be 90 ℃, carbonic acid gas air pressure is that 0.2Mpa, reaction times are 2.5h, make sodium silicate solution or colloidal sol and carbonic acid gas that sufficient acidifying neutralization reaction take place, generate the solidliquid mixture of precipitation of silica and sodium carbonate solution.
6) separate silicon-dioxide: the solidliquid mixture that step 5) generated is carried out filtration treatment, wherein precipitation of silica and sodium carbonate solution are separated.
7) preparation white carbon black: to the isolated precipitation of silica of step 6) wash, drying and pulverization process, can obtain the white carbon black finished product.Its specification of quality meets the HG/T3061-1999 standard after testing, and specific surface area reaches 160～190m
2/ g.
8) preparation soda ash: the isolated sodium carbonate solution of step 6) is carried out centrifugal dehydration treatment, through calcining, can obtain technical grade soda ash finished product again.Its specification of quality meets the GB210-80 standard after testing, can be used as the raw material of producing glass.
The carbon content of rice hull ash determines the output of above-mentioned three finished products.Biomass fermentation power plant with annual electricity generating capacity 1.2MW is an example, but about 1.789 ten thousand villages of production in every year rice hull ash if wherein contain 30% carbon, then can produce about 5000 tons of gac, about 1.2 ten thousand tons of white carbon black, about 6000 tons of soda ash every year.Certainly, as the power station wish that rice husk burns fully more, carbon content in the rice hull ash is few more good more.
Claims (8)
1. method of utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash is the process that rice hull ash that power plant burning rice husk biolobic material is produced and stack gas are carried out comprehensive treating process, and it is characterized in that: this method comprises the steps:
1) digestion rice hull ash: with the rice hull ash that above-mentioned burning was produced is raw material, is solvent with the sodium hydroxide solution, makes rice hull ash that chemical reaction take place in sodium hydroxide solution, obtains the solid-liquid mixture of sodium silicate solution or colloidal sol and insolubles;
2) separate solid-liquid mixture: the solid-liquid mixture that step 1) obtained is carried out filtration treatment, the sodium silicate solution of liquid phase or the insolubles of colloidal sol and solid phase are separated;
3) preparation gac: to step 2) the insolubles filter cake that is obtained carries out pickling, uses hot wash then, passes through centrifuge dehydration, high temperature drying, air cooling, pulverizing and/or forming processes again, obtains active carbon finished products;
4) reclaim carbonic acid gas: with the flue gas that above-mentioned burning was produced is raw material, adopting existing any sulfur removal technology that flue gas is carried out desulfurization earlier handles, adopt the carbonic acid gas in the MEA process absorption flue gas then, to be absorbed with the solution thermal regeneration of carbonic acid gas again, and make the carbonic acid gas in the solution parse standby;
5) sic acid sodium: the carbonic acid gas that step 4) reclaimed is passed into step 2) in the sodium silicate solution or colloidal sol that is obtained, make sodium silicate solution or colloidal sol and carbonic acid gas generation acidifying neutralization reaction, generate the solidliquid mixture of precipitation of silica and sodium carbonate solution;
6) separate silicon-dioxide: the solidliquid mixture that step 5) generated is carried out filtration treatment, wherein precipitation of silica and sodium carbonate solution are separated;
7) preparation white carbon black: to the isolated precipitation of silica of step 6) wash, drying and pulverization process, acquisition white carbon black finished product;
8) preparation soda ash: the isolated sodium carbonate solution of step 6) is carried out centrifugal dehydration treatment,, obtain technical grade soda ash finished product again through calcining.
2. the method for utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash according to claim 1, it is characterized in that: in the said step 1), the employing mass percent concentration is 10～35% sodium hydroxide solution, in the volume ratio of sodium hydroxide solution and rice hull ash is 1: 1～3 ratio, makes rice hull ash that chemical reaction take place in sodium hydroxide solution.
3. the method for utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash according to claim 1 and 2, it is characterized in that: in the said step 1), in digestion temperature is that 85～90 ℃, digestion time are under the condition of 1～3h, makes rice hull ash that sufficient chemical reaction take place in sodium hydroxide solution.
4. the method for utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash according to claim 1 and 2, it is characterized in that: in the said step 3), the employing mass percent concentration is 20～30% hydrochloric acid soln, in the volume ratio of hydrochloric acid soln and insolubles is 4～6: 1 ratio, to step 2) the insolubles filter cake that obtained carries out pickling.
5. the method for utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash according to claim 4, it is characterized in that: in the said step 3), the employing mass percent concentration is 25% hydrochloric acid soln, in the volume ratio of hydrochloric acid soln and insolubles is 5: 1 ratio, to step 2) the insolubles filter cake that obtained carries out pickling.
6. the method for utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash according to claim 1 and 2 is characterized in that: in the said step 4), flue gas is cooled to then it is pressurized to 600mmH below 40 ℃
2The O post adopts lime or gac dry desulfurization, makes amount of sulfur contenting in smoke less than 5mg/Nm
3Adopt MEA process to remove carbonic acid gas in the flue gas again, absorption temperature is 40 ℃; Solution with absorbing carbon dioxide carries out thermal regeneration at last, and regeneration temperature is 104～110 ℃, makes purity reach 90～99% carbonic acid gas and parses standby from solution.
7. the method for utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash according to claim 1 and 2, it is characterized in that: in the said step 5), at carbonic acid gas air pressure is that 0.1～0.3Mpa, design temperature are that 85～95 ℃, reaction times are under the condition of 1～3h, makes sodium silicate solution or colloidal sol and carbonic acid gas that sufficient acidifying neutralization reaction take place.
8. the method for utilizing biomass fermentation power plant waste co-producing active carbon, white carbon black and soda ash according to claim 7, it is characterized in that: in the said step 5), at design temperature is that 90 ℃, carbonic acid gas air pressure are that 0.2Mpa, reaction times are under the condition of 2.5h, makes sodium silicate solution or colloidal sol and carbonic acid gas that sufficient acidifying neutralization reaction take place.
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