CN101050076A - Method for stabilizing fly ash of municipal incinerator, and utilization of resource - Google Patents
Method for stabilizing fly ash of municipal incinerator, and utilization of resource Download PDFInfo
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- CN101050076A CN101050076A CNA2007100738152A CN200710073815A CN101050076A CN 101050076 A CN101050076 A CN 101050076A CN A2007100738152 A CNA2007100738152 A CN A2007100738152A CN 200710073815 A CN200710073815 A CN 200710073815A CN 101050076 A CN101050076 A CN 101050076A
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- Prior art keywords
- flying dust
- concrete
- mortar
- sand
- heavy metal
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000010881 fly ash Substances 0.000 title claims abstract description 11
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 10
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 38
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 21
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 16
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims abstract description 13
- 238000005987 sulfurization reaction Methods 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims description 68
- UYJXRRSPUVSSMN-UHFFFAOYSA-P ammonium sulfide Chemical compound [NH4+].[NH4+].[S-2] UYJXRRSPUVSSMN-UHFFFAOYSA-P 0.000 claims description 16
- 230000006641 stabilisation Effects 0.000 claims description 12
- 238000011105 stabilization Methods 0.000 claims description 12
- 239000002956 ash Substances 0.000 claims description 11
- 238000004064 recycling Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000007900 aqueous suspension Substances 0.000 claims description 2
- 229910003439 heavy metal oxide Inorganic materials 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- 230000001988 toxicity Effects 0.000 abstract description 14
- 231100000419 toxicity Toxicity 0.000 abstract description 14
- 239000007787 solid Substances 0.000 abstract description 8
- 238000000605 extraction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002411 adverse Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 231100001261 hazardous Toxicity 0.000 abstract 1
- 230000036571 hydration Effects 0.000 abstract 1
- 238000006703 hydration reaction Methods 0.000 abstract 1
- 229910021645 metal ion Inorganic materials 0.000 abstract 1
- 230000000704 physical effect Effects 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 45
- 239000004568 cement Substances 0.000 description 15
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 239000002920 hazardous waste Substances 0.000 description 12
- 238000012423 maintenance Methods 0.000 description 12
- 238000003756 stirring Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 239000002893 slag Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000004575 stone Substances 0.000 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 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 150000002013 dioxins Chemical class 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000009156 water cure Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052980 cadmium sulfide Inorganic materials 0.000 description 1
- -1 carbonate compound Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005008 domestic process Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000138 intercalating agent Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
This invention discloses a method for stabilizing and utilizing fly ashes of urban solid garbage incinerator. The method utilizes fly ashes of urban solid garbage incinerator to replace 5-25% of fine aggregate (sand) of concrete or mortar to produce concrete blocks or construction mortar. The method utilizes hydration/NH4HCO3 carbonation/ (NH4)2S sulfurization to stabilize heavy metals in fly ashes. The heavy metals are stabilized in the form of insoluble salts without the need for introducing metal ions. The replacement of fine aggregate (sand) of concrete or mortar by stabilized fly ashes does not impose any adverse effect on the physical properties of concrete or mortar, and can improve the physical strength of concrete due to its hydraulicity. The heavy metal stripping concentration in the stripping solution of concrete or mortar sample is much less than that specified in Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity GB 5085.3-1996.
Description
Technical field:
The invention belongs to Solid Waste Treatment and Resources and utilize technical field, particularly relate to the method for stabilizing fly ash processing of urban solid garbage incinerator and recycling.
Background technology:
Along with the extensive popularization of domestic city solid refuse burning electricity generation technology, the flying dust amount that incinerator produces increases day by day.And this flying dust toxic heavy metal such as a large amount of mercury of enrichment, cadmium, lead not only, and enrichment a large amount of dioxins materials, thereby (GB 18485-2001) expressly provides danger wastes by national standard, must carry out stabilization treatment before ultimate disposal.
Domestic stabilization treatment research at flying dust has been the focus of environmental protection area research, at present in colleges and universities such as Tongji University, Zhejiang University and Tsing-Hua University and scientific research institutions the research work of handling at flying dust is arranged all.On the stabilization treatment of flying dust, the main method that adopts has: melting and solidification, cement solidification, chemically stable and acid and other solvents are to effective extraction of heavy metal.Cement solidification is the domestic method that generally adopts, but all obviously increases with the quality and the volume of the flying dust after this method curing, thereby has increased the weight of the burden of refuse landfill.Smelting furnace solidify be more than 1200 ℃ with waste residue fusions such as flying dusts, quenching through cooling off after obtains character and totally different glass state material originally.Ash melting can reduce volume, reduces shared landfill place; The Dioxins destruction that is decomposed; Heavy metal substance volatilizees or is fused in the vitreum, melts the possibility that again and reduces greatly.But the investment of this method is big, energy consumption is high, fusion facility operations and operational management are complicated.Acid and other solvents are applicable to the occasion that heavy metal concentration is bigger to effective extraction of heavy metal, and the content of heavy metal is about 2% in the flying dust.Because heavy metal is the main harm thing in the flying ash of garbage cremator, the various chemical agent stabilization technologies that carry out at heavy metal in the flying dust come into one's own day by day.Especially the chemical agent stabilization compare with other stabilization method have that technology is simple, energy consumption is low, increase-volume than little, expense is moderate even advantage such as cheap, all is considered to a developing direction of stabilizing fly ashization at home and abroad.
The medicament that is used for stabilizing fly ashization mainly contains nine water cure sodium, phosphoric acid salt, green vitriol and organic intercalating agent etc., weigh the stabilization effect and the economic serviceability of each stabilization medicament, nine water cure sodium are preferable, but because this compound is a kind of very important raw material that is applied to aspects such as process hides, papermaking, printing and dyeing, pharmacy, chemical industry, the market requirement is big, can not guarantee the demand that flying dust is handled fully.In addition, too much sodium sulphite makes some heavy metal sulfides that generated to meeting, as HgS, and As
2S
3, Sb
2S
3, SnS
2And MoS
3Transform and form thiosulphate, thereby cause the stripping once more of heavy metal, contaminate environment.Therefore, a kind of safe, economic and practical chemical stabilizer of active demand and a kind of effective stabilization method heavy metal element in can the stable curing flying dust, and with its recycling.
Summary of the invention:
Problem to be solved by this invention is the method that proposes a kind of chemical stabilization and recycling urban solid garbage incinerator flying dust at above-mentioned existing existence deficiency.It is characterized in that: behind flying dust process aquation, carbonating and the stable heavy metal element wherein of sulfurized acting in conjunction, the fine aggregate (sand) that substitutes certain proportion (5～30%) in concrete or the mortar is made concrete or masonry mortar.
The quality proportioning that is used for stablizing the chemical reagent of flying dust and flying dust is as follows:
Bicarbonate of ammonia: flying dust=0.01～0.2
Ammonium sulfide: flying dust=0.005～0.02
Its concrete steps are as follows:
1) aquation: the oxyhydroxide of iron, nickel, manganese and chromium is water-fast insoluble compound, and (its solubility product is 10
-13-10
-38Between).Thereby flying dust at first adds the aqueous suspension aquation, changes heavy metal oxides such as iron, nickel, manganese, chromium in the flying dust into water-fast oxyhydroxide, reduces the consumption of subsequent compound with this.
2) carbonating: add bicarbonate of ammonia in the flying dust after aquation and carry out carbonating, heavy metal elements such as free lead, cadmium, zinc, barium, silver and manganese change water-fast carbonate compound in the flying dust, ammonium ion just changes gaseous ammonia under the alkali condition and volatilizees executing of flying dust hydrated product, does not have residuals to exist fully.
3) sulfuration: heavy metal exists with the form of sulfide mostly at occurring in nature, as greenockite, zink sulphide, lead glance etc., character is highly stable, by the geochemical process of nature, be difficult to disassociation, the metal that refine or discharge wherein also must lean on artificial smelting means such as electrolysis.Therefore, utilizing ammonium sulfide to handle heavy metal in the flying dust, to make it become metallic sulfide be extremely faint to the influence that environment produces.All be converted into water-fast sulfide after the reaction of heavy metal element in the flying dust and ammonium sulfide and stablized.Select last purpose of adding ammonium sulfide to be to avoid the sulfonium ion of negative divalence in the ammonium sulfide and the consumption that the non-heavy metal class substance reaction in the flying dust increases ammonium sulfide among the present invention.
4) a certain proportion of fine aggregate (sand) is made concrete or masonry mortar in alternative concrete of the flying dust of overstabilization or mortar.
Through above-mentioned " aquation-bicarbonate of ammonia carbonating-ammonium sulfide sulfuration " stabilization and cemented processing, heavy metal in the urban solid garbage incinerator flying dust and harmful ion seal admittedly, substitute by physics or form such as absorption is solidified in the water inlet muddy water product structure, make the heavy metal in the flying dust become more stable, but reach the degree of safe utilization and realize changing waste into resources.
Because the volcanic ash characteristic that flying dust self has, the present invention makes concrete or masonry mortar with urban solid garbage incinerator flying dust as the building mixing material, not only can strengthen the physical strength of concrete or mortar, and its every leaching toxicity index detection all meets national standard.Thereby solved the processing difficult problem of flying ash of garbage cremator up hill and dale, accomplishing turns waste into wealth, and is the breakthrough to urban solid garbage incinerator flying dust processing and utilizing.
Embodiment:
Application example one:
1, the flying ash of garbage cremator of collecting is preserved (the anti-moisture absorption hardens) by the mode that stores cement;
2, the flying dust of getting 1.2kg substitutes the sand of respective quality in the concrete, and flying dust is placed concrete mixer, adds the water of 6.6kg, stirs 10min;
3, add the bicarbonate of ammonia of 0.012kg, stir after 2 minutes, interpolation 0.024kg concentration is 25 percent ammonium sulfide solution, restir 5min;
4,, mix to above-mentioned solution interpolation 10.0kg cement (P.032.5), 40.8kg stone, 23.8kg sand according to C20 concrete quality proportioning.
5, make the test block of 150mm * 150mm * 150mm, the demoulding and get the physical size (being accurate to 0.1mm) of test block with dipstick metering behind the diel;
6, after 28 days, measure the physical size of test block in maintenance under the environment of humidity again, and be calculated as follows the shrinking percentage of test block.
(28 days size of size-test block of 24 hours of test block)/24 hours size * 100% of test block
The result show flying dust substitute in the concrete concrete test block that 5% fine aggregate (sand) makes after the demoulding 24 hours and through maintenance in 28 days after, the highly stable no shrinkage phenomenon of its test block size.
Find that by test the flying dust of interpolation does not only influence concrete ultimate compression strength, and can also increase concrete ultimate compression strength to its mechanical property.
The concrete test block that will contain flying dust is broken into the disintegrating slag of particle diameter less than 5mm, carries out Hazardous wastes and leaches its heavy metal content of toxicity discriminating back discovery also well below " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB 5085.3-1996) limit value.
Application example two:
1, the flying ash of garbage cremator of collecting is preserved (the anti-moisture absorption hardens) by the mode that stores cement;
2, the flying dust of getting 19.5kg places concrete mixer, adds the water of 56.0kg, stirs 10min;
3, add the bicarbonate of ammonia of 1.95kg, behind the stirring 2min, interpolation 0.78kg concentration is 25 percent ammonium sulfide solution, restir 5min;
4, mix according to C30 concrete quality proportioning interpolation 100.0kg cement (P.C32.5), 305.0kg stone, 163.0kg sand.
5, make the test block of 150mm * 150mm * 150mm, the demoulding and get the physical size (being accurate to 0.1mm) of test block with dipstick metering behind the diel;
6, after 28 days, measure the physical size of test block in maintenance under the environment of humidity again, and calculate the shrinking percentage of test block.
The result show flying dust substitute in the concrete concrete test block that 10% fine aggregate (sand) makes after the demoulding 24 hours and through maintenance in 28 days after, its test block size is highly stable, no shrinkage phenomenon.
Find that by test the flying dust of interpolation does not only influence concrete ultimate compression strength, and can also increase concrete ultimate compression strength to its mechanical property.
The concrete test block that will contain flying dust is broken into the disintegrating slag of particle diameter less than 5mm, carries out Hazardous wastes and leaches its heavy metal content of toxicity discriminating back discovery also well below " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB 5085.3-1996) limit value.
Application example three:
1, the flying ash of garbage cremator of collecting is preserved (the anti-moisture absorption hardens) by the mode that stores cement;
2, the flying dust of getting 3.05kg places concrete mixer, adds the water of 4.5kg, stirs 10min;
3, add the bicarbonate of ammonia of 0.61kg, behind the stirring 2min, interpolation 0.244kg concentration is 25 percent ammonium sulfide solution, restir 5min;
4, mix according to C50 concrete quality proportioning interpolation 10kg cement (P.042.5R), 26.1kg stone, 9.15kg sand.
5, make the test block of 150mm * 150mm * 150mm, the demoulding and get the physical size (being accurate to 0.1mm) of test block with dipstick metering behind the diel;
6, after 28 days, measure the physical size of test block in maintenance under the environment of humidity again, and calculate the shrinking percentage of test block.
The result show flying dust substitute in the concrete concrete test block that 25% fine aggregate (sand) makes after the demoulding 24 hours and through maintenance in 28 days after, the highly stable no shrinkage phenomenon of its test block size.
Find that by test the flying dust of interpolation does not only influence concrete ultimate compression strength, and can also increase concrete ultimate compression strength to its mechanical property.
The concrete test block that will contain flying dust is broken into the disintegrating slag of particle diameter less than 5mm, carries out Hazardous wastes and leaches its heavy metal content of toxicity discriminating back discovery also well below " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB 5085.3-1996) limit value.
Application example four
1, the flying ash of garbage cremator of collecting is preserved (the anti-moisture absorption hardens) by the mode that stores cement;
2, the flying dust of getting 2.85kg substitutes the sand of respective quality in the mortar, and flying dust is placed mortar mixer, adds the water of 10.0kg, stirs 10min;
3, add the bicarbonate of ammonia of 0.0285kg, stir after 2 minutes, interpolation 0.056kg concentration is 25 percent ammonium sulfide solution, restir 5min;
4, according to the quality proportioning of mortar grade M5, add 10.0kg cement (P.O32.5) to above-mentioned solution and mix with 54.15kg river sand.
5, make the test block of 70.5mm * 70.5mm * 70.5mm, the demoulding and get the physical size (being accurate to 0.1mm) of test block with dipstick metering behind the diel;
6, after 28 days, measure the physical size of test block in maintenance under the environment of humidity again, and calculate the shrinking percentage of test block.
The result show flying dust substitute in the mortar mortar specimen that 5% fine aggregate (sand) makes after the demoulding 24 hours and through maintenance in 28 days after, its test block size is highly stable, no shrinkage phenomenon.
Find that by test the flying dust of interpolation does not only influence the ultimate compression strength of mortar, and can also increase the ultimate compression strength of mortar to its mechanical property.
The mortar specimen that will contain flying dust is broken into the disintegrating slag of particle diameter less than 5mm, carries out Hazardous wastes and leaches toxicity and differentiate that the back finds that its heavy metal content is also well below " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB5085.3-1996) limit value.
Application example five:
1, the flying ash of garbage cremator of collecting is preserved (the anti-moisture absorption hardens) by the mode that stores cement;
2, the flying dust of getting 4.7kg places mortar mixer, adds the water of 8.8kg, stirs 10min;
3, add the bicarbonate of ammonia of 0.47kg, behind the stirring 2min, interpolation 0.188kg concentration is 25 percent ammonium sulfide solution, restir 5min;
4, quality proportioning interpolation 10.0kg cement (No. 325 silicate cements), the 42.3kg river sand according to mortar grade M7.5 mixes.
5, make the test block of 70.5mm * 70.5mm * 70.5mm, the demoulding and get the physical size (being accurate to 0.1mm) of test block with dipstick metering behind the diel;
6, after 28 days, measure the physical size of test block in maintenance under the environment of humidity again, and calculate the shrinking percentage of test block.
The result show flying dust substitute in the mortar mortar specimen that 10% fine aggregate (sand) makes after the demoulding 24 hours and through maintenance in 28 days after, its test block size is highly stable, no shrinkage phenomenon.
Find that by test the flying dust of interpolation does not only influence the ultimate compression strength of mortar, and can also increase the ultimate compression strength of mortar to its mechanical property.
The mortar specimen that will contain flying dust is broken into the disintegrating slag of particle diameter less than 5mm, carries out Hazardous wastes and leaches toxicity and differentiate that the back finds that its heavy metal content is also well below " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB5085.3-1996) limit value.
Application example six:
1, the flying ash of garbage cremator of collecting is preserved (the anti-moisture absorption hardens) by the mode that stores cement;
2, the flying dust of getting 10.5kg places mortar mixer, adds the water of 7.0kg, stirs 10min;
3, add the bicarbonate of ammonia of 2.1kg, behind the stirring 2min, interpolation 0.84kg concentration is 25 percent ammonium sulfide solution, restir 5min;
4, quality proportioning interpolation 10.0kg cement (No. 325, slag silicate rock cement), the 31.5kg river sand according to mortar grade M10 mixes.
5, make the test block of 70.5mm * 70.5mm * 70.5mm, the demoulding and get the physical size (being accurate to 0.1mm) of test block with dipstick metering behind the diel;
6, after 28 days, measure the physical size of test block in maintenance under the environment of humidity again, and calculate the shrinking percentage of test block.
The result show flying dust substitute in the mortar mortar specimen that 25% fine aggregate (sand) makes after the demoulding 24 hours and through maintenance in 28 days after, its test block size is highly stable, no shrinkage phenomenon.
Find that by test the flying dust of interpolation does not only influence the ultimate compression strength of mortar specimen, but also increased the ultimate compression strength of mortar its mechanical property.
The mortar specimen that will contain flying dust is broken into the disintegrating slag of particle diameter less than 5mm, carries out Hazardous wastes and leaches its heavy metal content of toxicity discriminating back discovery also well below " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB 5085.3-1996) limit value.
Claims (4)
1, the method for a kind of stabilizing fly ash of municipal incinerator and recycling, it is characterized in that: behind flying dust process aquation, carbonating and the stable heavy metal element wherein of sulfurized acting in conjunction, 5～25% fine aggregate (sand) is made concrete segment or masonry mortar in alternative concrete or the mortar.
2, the method for stabilizing fly ash of municipal incinerator according to claim 1 and recycling is characterized in that flying ash of garbage cremator step stable and recycling is:
Flying dust at first adds the aqueous suspension aquation, changes heavy metal oxides such as iron, nickel, manganese, chromium in the flying dust into water-fast oxyhydroxide; Add bicarbonate of ammonia then in the flying dust after aquation and carry out carbonating; Then in flying dust, add ammonium sulfide and stablize heavy metal element in the flying dust, substitute in concrete or the mortar 5～25% fine aggregate (sand) with the flying dust after the stabilization at last and make concrete segment or masonry mortar.
3, the method for stabilizing fly ash of municipal incinerator according to claim 2 and recycling, it is characterized in that: the used compound of flying dust carbonating is a bicarbonate of ammonia, the sulfuration compound used therefor is an ammonium sulfide, and the mass ratio that flying dust substitutes fine aggregate (sand) in concrete or the mortar is 5～25%.
4, the method for stabilizing fly ash of municipal incinerator according to claim 3 and recycling is characterized in that the mass ratio of bicarbonate of ammonia, ammonium sulfide and flying dust is respectively:
Bicarbonate of ammonia: flying dust=0.01～0.2
Ammonium sulfide: flying dust=0.005～0.02.
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