CN103145442B - Method for preparing sintering-free ceramsite by using chemical sludge - Google Patents
Method for preparing sintering-free ceramsite by using chemical sludge Download PDFInfo
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- CN103145442B CN103145442B CN201310105707.4A CN201310105707A CN103145442B CN 103145442 B CN103145442 B CN 103145442B CN 201310105707 A CN201310105707 A CN 201310105707A CN 103145442 B CN103145442 B CN 103145442B
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- sludge
- ash
- dry blend
- roasting
- drying
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- 239000010802 sludge Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000126 substance Substances 0.000 title abstract description 12
- 239000002956 ash Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000010881 fly ash Substances 0.000 claims abstract description 11
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 8
- 239000010440 gypsum Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 20
- 238000003889 chemical engineering Methods 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000010903 husk Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 7
- 239000002910 solid waste Substances 0.000 abstract description 6
- 238000002386 leaching Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 abstract description 2
- 239000004088 foaming agent Substances 0.000 abstract 1
- 239000012798 spherical particle Substances 0.000 abstract 1
- 230000001988 toxicity Effects 0.000 abstract 1
- 231100000419 toxicity Toxicity 0.000 abstract 1
- 241000196324 Embryophyta Species 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 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
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for preparing non-sintered ceramsite by using chemical sludge, belonging to the technical field of treatment and recycling of dangerous solid wastes in the chemical industry. Firstly, drying sludge to obtain dried sludge; then roasting and drying the sludge, and crushing the obtained sludge ash by using a crusher; mixing the sludge ash powder, the fly ash, the cement, the gypsum powder, the light material and the foaming agent in proportion, uniformly stirring, adding water, stirring, preparing spherical particles, and finally naturally curing to obtain the baking-free filler. The invention takes dangerous solid waste chemical sludge and industrial solid waste fly ash as main raw materials, and adopts a non-sintering process, and carries out natural maintenance in the later period, thereby having less equipment investment, simple process route and low energy consumption; the prepared ceramsite has high strength, large specific surface area, rough surface and more pores, the leaching toxicity of heavy metals is in accordance with GB5085.3-2007, and the ceramsite can be used for water treatment engineering.
Description
Technical field
The present invention relates to a kind of method of utilizing chemical engineering sludge to prepare non-sintered haydite, belong to chemical industry hazardous solid waste and process disposal and resource technology field.
Background technology
Chemical industry is polluted many and serious, and especially, in chemical wastewater treatment process, every annual meeting produces a large amount of excess sludges, and their complicated components contain poisonous and hazardous organism and heavy metal etc.For a long time, domestic ubiquity the tendency of the light mud of heavy water, and the safe disposal ability of mud is always in lower level.
The disposal options of existing chemical engineering sludge is mainly to burn, but incineration disposal expense is high, and many units exist the problem of disposing capacity deficiency, therefore, then mud is illegally shifted, is toppled over, and causes serious environmental pollution.The lime-ash that sludge incineration produces is also dangerous solid waste, generally needs first pre-treatment, then carries out security landfill.Therefore the processing costs of incineration residue is also very high, and a lot of enterprises are difficult to bear, then process as general solid waste, make sludge burning ash residue not obtain rational ultimate disposal, become important environment risk source, also reasonably do not fully utilized, caused the waste of resource.Sludge burning ash residue is carried out to innoxious and resource utilization, turn waste into wealth, meet the requirement of recycling economy and Sustainable development, be extremely important.
The features such as it is large that the haydite that the lytag of take is representative generally has specific surface area, and porosity is large, and physical strength is high, and chemistry and biologically stable are good have obtained applying more and more widely in engineering of water treatment.The main chemical compositions of chemical engineering sludge lime-ash and flyash are very approaching, all belong to CaO-SiO
2-Al
2o
3-Fe
2o
3system, thereby there is the utilization of resources.
The preparation method of China's haydite be take sintering process as main at present, but agglomerating plant investment is large, and energy consumption is high, and production cost is improved, and has limited to a certain extent the development of haydite manufacturer.
Summary of the invention
The object of the invention is to provide in order to improve the deficiencies in the prior art that a kind of physical strength is high, specific surface area is large, chemistry and a kind of good method of utilizing chemical engineering sludge to prepare non-sintered haydite of biologically stable, this haydite utilizes chemical engineering sludge and industrial waste flyash, adopt non-sintered method, thereby investment reduces, energy efficient, reduce costs, for the recycling treatment of chemical engineering sludge has been opened up new approach.
Technical scheme of the present invention is: a kind of method of utilizing chemical engineering sludge to prepare non-sintered haydite, it is characterized in that, and concrete steps are as follows:
(1) dry chemical engineering sludge, obtains dewatered sludge;
(2) roasting dewatered sludge, gained mud lime-ash is pulverized with pulverizer;
(3) various raw materials are mixed by proportioning, the dry blend that stirs to obtain, the mass percent that wherein in dry blend, each component and each component account for dry blend total amount is respectively: mud lime-ash 20%-50%, flyash 25%-40%, cement 10%-25%, gypsum 5%-15%, light material 1%-5%, whipping agent 0.2%-0.6%;
(4) in above-mentioned dry blend, add water and stir, mix, its amount of water is the 30%-40% of dry blend weight;
(5) make spheroidal particle, its particle diameter is 5-10mm;
(6) natural curing 7-15 days.
Preferably described light material is pearlstone, rice husk or wood chip.Preferred selected whipping agent is aluminium powder or zinc powder.In preferred steps (1), the temperature of sludge-drying is 105-120 ℃, and be 8-24h time of drying.In preferred steps (2), the temperature of roasting dewatered sludge is 550 ℃-700 ℃, and roasting time is 20-40min.
In the present invention, mud lime-ash is similar to the main chemical compositions of flyash, possesses potential pozzolanic activity.Cement provides an effective alkaline environment as exciting agent, with SiO
2and Al
2o
3effect, generates the compound with hydraulic gelling property, the heavy metal in mud lime-ash is had to solidification simultaneously.Adding of gypsum can be accelerated active SiO
2, A1
2o
3reaction, simultaneously gypsum again can with A1
2o
3reaction, the calcium sulphoaluminate gum material of the generation hydraulicity.Light material can reduce the density of haydite, makes it lightization, and has certain bioaffinity.Whipping agent in alkaline environment can with the water releasing hydrogen gas that reacts, make filler produce pore, form light porous structure.
Beneficial effect:
Compare with traditional sludge treatment and haydite preparation method, tool has the following advantages:
1, in the present invention, the mass percent of mud lime-ash reaches 20%～50%, and utilization ratio is high, has greatly solved the problem of outlet of chemical engineering sludge.
2, the flyash in the present invention is also industrial solid castoff, further embodies efficient recycling rate, has obviously good environmental benefit and economic benefit, has dissemination.
3, the present invention is in mud ash comprehensive utilization, realized the solidifying of heavy metal, and therefore has innoxious and double effects resource utilization.
4, the present invention adopts non-sintered technique, and the later stage is carried out natural curing, and facility investment is few, operational path is simple, and energy consumption is low.
5, the haydite intensity that prepared by the present invention is high, and specific surface area is large, surface irregularity, and hole is many; To the fixed rate of each heavy metal all more than 60%, Leaching Heavy Metals meets < < Hazardous wastes judging standard leaching characteristic identification > > (GB5085.3-2007), can be used for engineering of water treatment.
Accompanying drawing explanation
Fig. 1 is that the prepared pottery of embodiment 1 is expected surperficial SEM Electronic Speculum figure;
Fig. 2 is the SEN Electronic Speculum figure of the prepared haydite section of embodiment 1;
Fig. 3 is process flow diagram of the present invention.
Embodiment
Process flow diagram of the present invention is as shown in Figure 3:
Embodiment 1:
Get water ratio and be certain chemical plant excess sludge of 84%, 110 ℃ of dry 12h, are placed in retort furnace in 700 ℃ of roasting 20min by dewatered sludge, cooling pulverize with pulverizer afterwards.Get respectively mud lime-ash 35g, flyash 20g, 32.5R composite Portland cement 10g, gypsum 5g, wood chip 1g, aluminium powder 0.4g, fully stirring and evenly mixing obtains dry blend, adds water and accounts for dry blend quality 36%, stirring and evenly mixing, then makes spherical haydite again, and its diameter is at 5-10mm.Haydite at normal temperature, protect under damp condition maintenance 10 days.Test, its tap density is 723kg/m
3, 1h water-intake rate is that 28.5%, BET specific surface area is 30.801m
2/ g, ultimate compression strength is 3.2MPa.Prepared pottery material surface and the SEM Electronic Speculum figure of section as depicted in figs. 1 and 2, can find out from scheming: non-sintered haydite is surperficial and inside is coarse, have numerous micro channels, and this structure is highly beneficial to adhering to, growing of microorganism.
Embodiment 2:
Get water ratio and be certain chemical plant excess sludge of 89%, 105 ℃ of dry 24h, are placed in retort furnace in 600 ℃ of roasting 30min by dewatered sludge, cooling pulverize with pulverizer afterwards.Get respectively mud lime-ash 35g, flyash 40g, 32.5R composite Portland cement 15g, gypsum 10g, pearlstone 3g, zinc powder 0.4g, fully stirring and evenly mixing obtains dry blend, adds water and accounts for 32% of dry blend quality, stirring and evenly mixing, then makes spherical haydite again, and its diameter is in 5-10mm left and right.Haydite at normal temperature, protect under damp condition maintenance 7 days.Test, its tap density is that tap density is 785kg/m
3, 1h water-intake rate is that 25.7%, BET specific surface area is 21.175m
2/ g, resistance to compression Compressive Strength is 3.5Mpa.
Embodiment 3:
Get water ratio and be certain chemical plant excess sludge of 78%, 120 ℃ of dry 8h, are placed in retort furnace in 550 ℃ of roasting 40min by dewatered sludge, cooling pulverize with pulverizer afterwards.Get respectively mud lime-ash 20g, flyash 35g, 32.5R composite Portland cement 25g, gypsum 15g, rice husk 5g, aluminium powder 0.21g, fully stirring and evenly mixing obtains dry blend, adds water and accounts for 38% of dry blend quality, stirring and evenly mixing, then makes spherical haydite again, and its diameter is in 5-10mm left and right.Haydite at normal temperature, protect under damp condition maintenance 15 days.Test, its tap density is 826kg/m
3, 1h water-intake rate is that 20.3%, BET specific surface area is 9.117m
2/ g, ultimate compression strength is 4.1Mpa.
The comparison of the non-sintered haydite Leaching Heavy Metals of table 1 and < < Hazardous wastes judging standard leaching characteristic identification > >
Claims (4)
1. utilize chemical engineering sludge to prepare a method for non-sintered haydite, it is characterized in that, concrete steps are as follows:
(1) dry chemical engineering sludge, obtains dewatered sludge;
(2) roasting dewatered sludge, gained mud lime-ash is pulverized with pulverizer;
(3) various raw materials are mixed by proportioning, the dry blend that stirs to obtain, the mass percent that wherein in dry blend, each component and each component account for dry blend total amount is respectively: mud lime-ash 20%-50%, flyash 25%-40%, cement 10%-25%, gypsum 5%-15%, light material 1%-5%, whipping agent 0.2%-0.6%; Described light material is pearlstone, rice husk or wood chip;
(4) in above-mentioned dry blend, add water and stir, mix, its amount of water is the 30%-40% of dry blend weight;
(5) make spheroidal particle, its particle diameter is 5-10mm;
(6) natural curing 7-15 days.
2. method according to claim 1, is characterized in that selected whipping agent is aluminium powder or zinc powder.
3. method according to claim 1, is characterized in that the temperature of sludge-drying in step (1) is 105-120 ℃, and be 8-24h time of drying.
4. method according to claim 1, is characterized in that the temperature of roasting dewatered sludge in step (2) is 550 ℃-700 ℃, and roasting time is 20-40min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310105707.4A CN103145442B (en) | 2013-03-28 | 2013-03-28 | Method for preparing sintering-free ceramsite by using chemical sludge |
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|---|---|---|---|
| CN201310105707.4A CN103145442B (en) | 2013-03-28 | 2013-03-28 | Method for preparing sintering-free ceramsite by using chemical sludge |
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| CN103145442A CN103145442A (en) | 2013-06-12 |
| CN103145442B true CN103145442B (en) | 2014-07-16 |
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