CN101376573A - Method for recycling sludge of sewage plant to produce cement - Google Patents
Method for recycling sludge of sewage plant to produce cement Download PDFInfo
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- CN101376573A CN101376573A CNA2007100550586A CN200710055058A CN101376573A CN 101376573 A CN101376573 A CN 101376573A CN A2007100550586 A CNA2007100550586 A CN A2007100550586A CN 200710055058 A CN200710055058 A CN 200710055058A CN 101376573 A CN101376573 A CN 101376573A
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- mud
- sludge
- cement
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- kiln
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention relates to a method which is used for directly applying the settled sludge of a wastewater treatment plant to the cement production after treatments of iron removing, sterilization and deodorization, dehydration and drying. The method comprises the following steps: firstly, the iron of the sludge is removed; secondly, the sludge is sterilized and deodorized; thirdly, the sludge is dehydrated and dried; fourthly, the mixture amount of the sludge is determined; fifthly, the sludge enters a kiln system for calcining; and sixthly, the clinker obtained by the incineration and gypsum are mixed and made into cement by a cement grinding mill. The method adopting the invention has the following advantages: firstly, the resource utilization of the sludge is realized, a large amount of clay mineral is economized, and the precious land resource is saved; secondly, the abundant heat value of the sludge can be effectively utilized, and the coal resource can be economized; thirdly, the harmless treatment is carried out to the sludge at the temperature higher than 1450 DEG C, both the organic matters and the inorganic matters in the municipal sludge can be cracked and calcined into harmless matters, and the possibilities of producing poisonous gases and waste residues are avoided during the low temperature treating process; fourthly, the heavy metals in the municipal sludge are dissolved in the portland cement clinker minerals in a solid way, and are tightly combined with the cement ingredients by chemical bonds, and the heavy metal pollution phenomenon cannot happen under the usual conditions; and fifthly, the mixed and burnt sludge does not increase the clinker calcination difficulty and does not reduce the cement strength, but also has a certain mineralization promoting effect on the cement clinker calcination to a certain extent.
Description
Technical field
The present invention relates to a kind of sewage plant sludge that utilizes through sterilization and deodorization with dehydrate and handle that the back substitutes the part clay as one of raw material and the method that is used to produce cement.
Background technology
Mud is meant the sedimentable matter that Sewage Plant produces in sewage treatment process, stench that mud distributes and microorganism have fatal lethality to environment.At present, the main methods of mud has landfill method, composting process and burning method.Landfill method and composting process have that floor space is big, long processing period, cause the shortcoming of secondary pollution easily.Burning method is more thorough to the processing of mud, but also exists shortcoming: (1) generally needs to add the other fuel that adds because sludge moisture content is bigger, and calorific value is low, has increased unnecessary expenditures; (2) mud can produce the dioxin highly toxic substance in the process of burning, and its purification system investment is bigger, the running cost height.
According to analysis, sewage plant sludge main component after removing its loss on ignition approaches to be used to produce the clayey raw material of cement, and therefore can be used as raw material from composition mud is used to produce cement.Cement kiln has that disposing sludge quantity is big, dead time length, self-purification degree height, the secondary pollution in kiln of less investment, furnace gas temperature height, material is few, handle advantage completely.In the calcination process of grog, do not contain residue and produce, calcining back heavy metal element is fixed in the lattice of clinker mineral.Mud is after cement kiln is handled sintering, and cement becomes cement stone through hydration and hardening, leaches toxicity again and differentiates that heavy metal content is minimum in the leach liquor.The finished product of cement are concrete, and the heavy metal in the concrete component is fixed, thereby are irremovable, and the heavy metal in the mud enters concrete through cement and is present in hydrated cement-hardened cement paste or the concrete interstitial water.Because hardened cement paste has the ability of great constraint heavy metal, so heavy metal seldom can disengage from concrete.Because the pore structure of concrete densification has very big resistance to diffusion, effectively stoped the release that is dissolved in heavy metal in the hardened cement paste space in addition.Therefore, the heavy metal in the concrete component can not influence environment.
Summary of the invention
The object of the present invention is to provide the method for a kind of sewage plant sludge, turn waste into wealth, reduce and pollute, the effect that reduces cost to reach through being used to produce cement after the drying treatment.
To achieve these goals, technical program of the present invention lies in adopting a kind of sewage plant sludge to be used to produce the method for cement after treatment, may further comprise the steps:
(1) deironing of mud: utilize magnetic to remove metallic iron in the mud;
(2) sterilization and deodorization of mud: in mud, add a certain amount of sterilization and deodorization agent;
(3) mud dehydrate processing: by dehydrating, make sludge water content less than 20%;
(4) determine the incorporation of mud;
(5) go into the kiln calcining;
(6) calcining gained grog and gypsum fit into cement grinding mill, make cement.
Sterilization and deodorization agent in the described step (2) is a unslaked lime, and its addition is 1～5% of a mud weight.
Drying plant in the described step (3) comprises open storage seasoning, filter-press dehydration, centrifuge dehydration and vacuum hydro-extraction.
The incorporation of mud is determined according to sludge heavy-metal content in the described step (4).
Mud in the described step (5) is directly to be admitted to rotary system and to calcine in any position from decomposing furnace, kiln tail smoke-box, kiln body middle part, four positions of chamotte cooler through transport unit.
The present invention is mud that Sewage Plant is produced through sterilization and deodorization and dehydrates after the processing, drops into directly that calcining is cement clinker in the rotary kiln.Utilize to replace after the sewage plant sludge drying raw clay to drop in the rotary kiln, calcining obtains Portland clinker under 1450 ℃ the high temperature being higher than, and admixture gypsum and blended material grinding obtain cement again, and guarantee its quality.
Adopt method of the present invention to have following effect: (1) recycling municipal sludge, save a large amount of clay minerals, the land resources of saves valuable; (2) harmless treatment municipal sludge under greater than 1450 ℃ temperature, is that organism or inorganics all can be sintered into innoxious compound in the municipal sludge.Produce the possibility of poisonous fume and waste residue when having avoided subzero treatment; (3) heavy metal in the municipal sludge is solidly soluted in the Portland clinker mineral and goes, closely be combined in the cement composition, under the usual conditions condition, can not produce heavy metal and reveal and leach phenomenon by chemical bond; (4) burning mixed mud does not only increase clinker calcination difficulty and reduces strength of cement, has promoter action on the contrary to a certain extent, and the burn-ability to raw material also has some improvement in addition.
The gas temperature of the kiln hood of the rotary kiln of cement mill calcination of chamotte can reach more than 1800 ℃, temperature of charge can reach more than 1450 ℃, under so high temperature, the mud of handling is dropped in the rotary kiln, wherein objectionable constituent will all be cracked into harmless material.Rotary kiln has the strict facility that gathers dust, and can effectively remove obnoxious flavour.Simultaneously, the cement burning system is a negative-pressure operation, has avoided obnoxious flavour to reveal in production environment.The acidic substance that alkaline matter in the cement kiln system can produce with mud chemical combination mutually become stable salt, are convenient to the purifying treatment of waste gas, and can carry out together with the cement industry process.Most heavy metals in the waste material and waste residue also can be fixed in the grog by calcining, can not pollute environment.
Adopt method of the present invention for small and medium cities, can save about 30 mu in soil, about 6000 tons of coals, special about 1,000,000 yuan of sludge treatment expenses, about 300,000 yuan of clay winning trucking costs every year.
Embodiment
The specific embodiment of the present invention is as follows:
(1) deironing of mud: utilize magnetic to remove metallic iron in the mud.
(2) sterilization and deodorization of mud: utilize unslaked lime as the sterilization and deodorization agent, the ratio with 1%～5% adds in the mud.
(3) mud dehydrate processing: utilize seasoning in the air, pressure-filtering dehydration drying, centrifugal drying, vacuum hydro-extraction dry technology, mud dehydrated processing, make sludge water content less than 20%.
(4) determine the mud incorporation: to meet following table acceptance of the bid punctual for heavy metal content in mud, determines to be limited to 20% on the incorporation of mud; When heavy metal content in the mud exceeds in the following table limit standard, determine to be limited to 10% (the above mud volume all is as the criterion with mud after the drying) on the incorporation of mud.
| Cd | Cu | Pb | Zn | Cr | Ni | Hg | As | |
| Heavy metal content | <5 | <250 | <300 | <500 | <600 | <100 | <5 | <75 |
(5) go into the kiln calcining
Because still can residual a certain amount of moisture in the less and mud of volume, do not adopt and raw material blended mode, mud directly is admitted to kiln system calcining formation grog in any position from decomposing furnace, kiln tail smoke-box, kiln body middle part, four positions of chamotte cooler through belt conveyor, screw reamer, pipeline transport unit.This kind feed way is simple, and it is thorough fast to handle harmful volatile component.
(6) cement performance test
The grog and the gypsum of calcining gained fit into cement grinding mill, make cement, and its physicals is tested, test result such as following table:
The cement performance test-results
By testing data as can be seen, the present invention is with sewage plant sludge instead of part clay ingredient burning silicate cement, can not exert an influence to the quality of cement products.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1, the method that is used to produce cement after a kind of sewage plant sludge process deodorizing dry is handled is characterized in that: may further comprise the steps:
(1) deironing of mud: utilize magnetic to remove metallic iron in the mud;
(2) sterilization and deodorization of mud: in mud, add a certain amount of sterilization and deodorization agent;
(3) mud dehydrate processing: by dehydrating, make sludge water content less than 20%;
(4) determine the incorporation of mud: determine addition content according to contents of heavy metal elements in the mud;
(5) go into the kiln calcining: mud drops into the clinker burning system in arbitrary position from kiln tail smoke-box, decomposing furnace, kiln body middle part, chamotte cooler.
(6) calcining gained grog and proper amount of gypsum and blended material fit into cement grinding mill, make cement.
2, the method that is used to produce cement after sewage plant sludge process deodorizing dry according to claim 1 is handled, it is characterized in that: the sterilization and deodorization agent in the described step (2) is a unslaked lime, its addition is 1%～5% of a mud gross weight.
3, the method that is used to produce cement after sewage plant sludge process deodorizing dry according to claim 1 is handled, it is characterized in that: the dehydrating and drying method in the described step (3) comprises seasoning in the air, pressure-filtering dehydration drying, centrifugal drying and vacuum hydro-extraction dry technology.
4, the method that is used to produce cement after sewage plant sludge process deodorizing dry according to claim 1 is handled, it is characterized in that: the mud volume in the described step (4) is determined according to heavy metal content in the mud.
5, the sewage plant sludge according to claim 1 method that is used to produce cement after handling through deodorizing dry is characterized in that: the mud in the described step (5) is directly to be admitted to rotary system and to calcine in any one position from decomposing furnace, kiln tail smoke-box, kiln body middle part, four positions of chamotte cooler through transport unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100550586A CN101376573A (en) | 2007-08-30 | 2007-08-30 | Method for recycling sludge of sewage plant to produce cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100550586A CN101376573A (en) | 2007-08-30 | 2007-08-30 | Method for recycling sludge of sewage plant to produce cement |
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| Publication Number | Publication Date |
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| CN101376573A true CN101376573A (en) | 2009-03-04 |
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| CNA2007100550586A Pending CN101376573A (en) | 2007-08-30 | 2007-08-30 | Method for recycling sludge of sewage plant to produce cement |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153297A (en) * | 2010-11-29 | 2011-08-17 | 赵楠 | Method and equipment for treating town sludge by novel dry-method cement kiln |
| CN102633415A (en) * | 2012-04-06 | 2012-08-15 | 江苏塞尚低碳科技有限公司 | Water paint production wastewater sludge recycling method |
| CN102826797A (en) * | 2011-06-14 | 2012-12-19 | 北京仁创科技集团有限公司 | Building material composition containing sludge and building rubbish and building material |
| CN103321185A (en) * | 2013-05-31 | 2013-09-25 | 南京信息工程大学 | Ecological impermeable cement canal |
| CN105000815A (en) * | 2014-04-17 | 2015-10-28 | 宝山钢铁股份有限公司 | Method for synergistically treating heavy metal sludge in cement production |
| CN105621827A (en) * | 2016-01-21 | 2016-06-01 | 云南铜业股份有限公司 | Heavy metal sludge precalcination-solidification treatment method |
| CN105967493A (en) * | 2016-07-11 | 2016-09-28 | 安徽锋亚环境技术有限公司 | 'One-stop' solution system and 'one-stop' solution method for tap water plant sludge treatment |
| CN106186746A (en) * | 2016-06-30 | 2016-12-07 | 浙江新业管桩有限公司 | A kind of method utilizing printing and dyeing sludge to prepare clinker |
| CN109052879A (en) * | 2018-08-22 | 2018-12-21 | 国诚集团有限公司 | A kind of municipal sludge drying method |
| CN109180033A (en) * | 2018-09-20 | 2019-01-11 | 王敏 | A kind of preparation method of radiation proof cement |
| CN109437616A (en) * | 2018-12-18 | 2019-03-08 | 西安建筑科技大学 | A kind of method and system preparing cement using municipal sludge |
| CN110642486A (en) * | 2019-11-01 | 2020-01-03 | 界首市官星环保科技有限公司 | Sludge treatment method |
| CN115893917A (en) * | 2023-02-15 | 2023-04-04 | 河北工业大学 | Concrete for mixing seawater and fixing chloride ions in seawater |
-
2007
- 2007-08-30 CN CNA2007100550586A patent/CN101376573A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153297A (en) * | 2010-11-29 | 2011-08-17 | 赵楠 | Method and equipment for treating town sludge by novel dry-method cement kiln |
| CN102153297B (en) * | 2010-11-29 | 2013-04-24 | 赵楠 | Method and equipment for treating town sludge by novel dry-method cement kiln |
| CN102826797A (en) * | 2011-06-14 | 2012-12-19 | 北京仁创科技集团有限公司 | Building material composition containing sludge and building rubbish and building material |
| CN102633415A (en) * | 2012-04-06 | 2012-08-15 | 江苏塞尚低碳科技有限公司 | Water paint production wastewater sludge recycling method |
| CN103321185A (en) * | 2013-05-31 | 2013-09-25 | 南京信息工程大学 | Ecological impermeable cement canal |
| CN105000815A (en) * | 2014-04-17 | 2015-10-28 | 宝山钢铁股份有限公司 | Method for synergistically treating heavy metal sludge in cement production |
| CN105621827A (en) * | 2016-01-21 | 2016-06-01 | 云南铜业股份有限公司 | Heavy metal sludge precalcination-solidification treatment method |
| CN106186746A (en) * | 2016-06-30 | 2016-12-07 | 浙江新业管桩有限公司 | A kind of method utilizing printing and dyeing sludge to prepare clinker |
| CN105967493A (en) * | 2016-07-11 | 2016-09-28 | 安徽锋亚环境技术有限公司 | 'One-stop' solution system and 'one-stop' solution method for tap water plant sludge treatment |
| CN109052879A (en) * | 2018-08-22 | 2018-12-21 | 国诚集团有限公司 | A kind of municipal sludge drying method |
| CN109180033A (en) * | 2018-09-20 | 2019-01-11 | 王敏 | A kind of preparation method of radiation proof cement |
| CN109437616A (en) * | 2018-12-18 | 2019-03-08 | 西安建筑科技大学 | A kind of method and system preparing cement using municipal sludge |
| CN109437616B (en) * | 2018-12-18 | 2021-04-13 | 西安建筑科技大学 | Method and system for preparing cement by using municipal sludge |
| CN110642486A (en) * | 2019-11-01 | 2020-01-03 | 界首市官星环保科技有限公司 | Sludge treatment method |
| CN115893917A (en) * | 2023-02-15 | 2023-04-04 | 河北工业大学 | Concrete for mixing seawater and fixing chloride ions in seawater |
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Open date: 20090304 |