CN100398472C - Method and device of treating urban mud by using cement rotary kiln - Google Patents

Method and device of treating urban mud by using cement rotary kiln Download PDF

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Publication number
CN100398472C
CN100398472C CNB2005100691886A CN200510069188A CN100398472C CN 100398472 C CN100398472 C CN 100398472C CN B2005100691886 A CNB2005100691886 A CN B2005100691886A CN 200510069188 A CN200510069188 A CN 200510069188A CN 100398472 C CN100398472 C CN 100398472C
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sludge
rotary kiln
mud
cement
calcium oxide
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CNB2005100691886A
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Chinese (zh)
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CN1861532A (en
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陈子庭
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陈子庭
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Abstract

The present invention discloses a method for urban sludge treatment using a cement rotary kiln. The method uses the cement rotary kiln, the sludge silt containing calcium hydroxide is burnt into a calcia manufactured product so as to be reused for the pretreatment of dehydration, desiccation and calcium increase of urban sludge with 70 to 80 percent water content, and reduce treating cost. The present invention also discloses a treating device using the method, the treating device comprises a sludge pretreatment unit and a sludge silt and new material synthesizing unit. Because the edge of a helical blade with a shaft of a spiral stirring conveying mechanism used by the device is in uneven structure, the present invention increases stirring effect and integral strength; a material discharging cover of a material discharging opening of a reacting cylinder prevents inner airflow and outer airflow in the reacting cylinder from exchanging, avoids heat loss, and increases reaction speed and effect.

Description

Utilize cement rotary kiln to handle the method for municipal sludge
Technical field
The present invention relates to a kind of method that the excess sludge that is produced after the municipal sewage treatment is handled.
Background technology
The mud that municipal wastewater treatment plant produced is the sewage aggregation process of sewage work with the city, remaining residue behind the middle water qualified discharge.Be a kind ofly to distribute stench, contain multiple volatile gases, have multiple pathogenic bacteria and virus and with enriched material from all kinds of materials such as industrial waste, family's chemicals, sterilant, heavy metal ion, poisonous chemicals.
The prior art of handling above-mentioned municipal sludge adopts the heat-generating agent of two-pack to be added in the mud, and its liquid component evaporation is solidified.Be acidic components with dehydration aluminium strong acid salt and non-aluminium strong acid salt in the heat-generating agent, comprise 40-120 weight part dehydration aluminium strong acid salt, the 10-50 weight part non-aluminium strong acid salt that dewaters, raw materials used wide material sources are abundant, cheap, characteristics such as preparation is convenient, but the shortcoming of this treatment process is to need to add a large amount of above-mentioned two-pack heat-generating agents, the result who draws after the test that the manufacturing of technical grade is processed proves, one group of chemical composition of every increase, the cost (even its raw material sources are in industrial residue) that its dehydration processing is made is strengthened in the capital, the manufacturing processed of acid and alkali double component heat-generating agent, acidic components are neutralized in a large number, have strengthened manufacturing cost; Cause very big waste; The preprocessing process of mud can discharge a large amount of obnoxious flavoures, and environment is polluted.
Summary of the invention
Purpose of the present invention just provides a kind of method of utilizing cement rotary kiln to handle municipal sludge, the high problem of running cost that exists with the treatment process that solves prior art.
Technical scheme of the present invention is: this method comprises mud pre-treatment and sludge silt novel material synthesis technique, wherein:
The mud pre-treatment is to add active calcium oxide in mud, mud is carried out drying, dehydration, deodorizing, modification, solved leakage problems in the transportation of sludge silt effectively, reduced volume, and reach the solid content standard that the cement rotary kiln secondary clacining can bear, the physical condition that produces novel material necessity is provided for novel material is synthetic;
The sludge silt novel material is synthetic be divided into into:
(1) active calcium oxide synthesis technique, be used to produce active calcium oxide: Wingdale, acidifying iron, dehydration aluminium strong acid salt, the non-aluminium strong acid salt of dehydration and the above-mentioned pretreated sludge silt that contains calcium hydroxide are mixed back preheating and decomposition according to a certain percentage, sending into rotary kiln adding fuel again calcines, the cooling back obtains to contain the solids of active calcium oxide, and this solids is back to described mud pre-treatment.
(2) cement synthesis technique, be used to produce cement: Wingdale, clay, silica, ferric oxide (or iron powder) and the described pretreated sludge silt that contains calcium hydroxide are mixed back preheating and decomposition according to a certain percentage, sending into rotary kiln adding fuel again calcines, the cooling back obtains cement clinker, mix with gypsum and other slag, fly ash material again, obtain finished cement through behind the grinding.
Calcining temperature in the described active calcium oxide synthesis technique is 650~1100 ℃, and its product makes particulate state active oxidation calcium product through the granulation of adhesive-free tablets press again.
The weight part of the active material that is added in the described active calcium oxide synthesis technique is respectively: dehydration aluminium strong acid salt 10-30 weight part, non-aluminium strong acid salt 5-9 weight part dewaters.
Described mud pre-treatment also comprises the gas processing step of the gas that produces in the treating processes being carried out harmless processing.
Characteristics of the present invention are employed acidic components during with the manufacturing heat-generating agent, and being used in cement rotary kiln increases its activity in calcining reduction calcium oxide process, and active calcium oxide is recycled and reused for the mud preprocessing process.Also can be innoxious effectively and as cement raw material, brickmaking, road engineering filler etc. with excess sludge, finally enter the resource circulation utilization field.
Description of drawings
Fig. 1 is the process flow diagram that the present invention produces active calcium oxide;
Fig. 2 is the process flow diagram that the present invention makes cement.
Embodiment
Referring to Fig. 1 and Fig. 2, a kind of method of utilizing cement rotary kiln to handle municipal sludge, this method comprises mud pre-treatment A and two kinds of sludge silt novel material synthesis techniques, wherein:
The step of mud pre-treatment A comprises adds calcium oxide in mud, be transported in the reaction tube through stirring, and the excess sludge of water ratio 75% is carried out drying, dehydration, deodorizing, modification.Solve in the transportation of sludge silt seepage effectively and reduced volume, and reached the solid content standard (solid content 〉=90%) that the cement rotary kiln secondary clacining can bear.The physical condition that produces novel material necessity is provided for novel material is synthetic.
Described mud pre-treatment also comprises the gas processing step of the gas that produces in the treating processes being carried out harmless processing.The kind of emission gases: different treatment facilities and process can produce various foul gas.The main foul smell that the inlet water lifting pumps house property of sewage work is given birth to is a hydrogen sulfide, and the foul smell that produces in the preliminary sedimentation tank anaerobic sludge digestion process can produce ammonia and other volatile substances based on hydrogen sulfide and other sulfurous gas in the mud alkalization stabilization process.Can produce ammonia, amine, sulfocompound, lipid acid, foul smell such as aromatic series and dimethyl sulphide in the rubbish sludge composting process.Aerobic sigestion and sludge air drying process may produce very a spot of hydrogen sulfide, but mainly contain mercaptan and the generation of dimethyl sulphide gas.
The wet absorption oxidation style: the wet absorption oxidation style is a kind of stench control that is widely used in, and is very ripe, stable, effectively processing method.This technology is suitable for handling atm number most, and the stench air-flow of high density is stable as mud, the stench that drying and other treatment and burning process produced etc.Equipment commonly used has three kinds of towers: packing tower, spray tower and washing tower.Their design aim is exactly to increase liquid-gas contact to greatest extent, promotes rate of mass transfer, thereby reaches higher processing rate.In this treatment process, foul gas is at first absorbed by chemical solution, and is oxidized then, and treatment effect depends on the solubleness of foul gas in chemical solution.In the stench air-flow, contain ammonia simultaneously, when hydrogen sulfide and other sulfurous gas, usually need to adopt the multistage absorption system, first step water or sulphuric acid soln absorb removes ammonia, promotes the pH value with sodium hydroxide then, is absorbed and remaining foul gas of oxidation by oxidizing agent solutions such as clorox again, as hydrogen sulfide, mercaptan and dimethyl sulphide etc. pass through after the demister at last, directly discharging or with the cleaned air mixed diluting after be discharged in the atmosphere and go.The advantage of this method is by two-stage or three grades of absorption systems, can remove multiple foul gas widely, and reaches very high removal efficient.This system can adapt to the variation of airshed and concentration by the circular flow that adjusting adds dose and solution, therefore has stronger turndown ratio.The wet absorption oxidation style has directly been used the unit operation theory and practice experience in the chemical industry, have very ripe, reliably, effectively, therefore advantage such as particularly floor space is little, is used widely in developed countries such as the U.S., and in suitable period in future, will be the main flow of stench control techniques, particularly at the transformation of old factory with the circumscribed more all advantages of stench of removing of newly founding the factory in soil are arranged.The wet absorption oxidation style also has its shortcoming, water and the chemical solution a large amount of as needs consumption, electric power etc.If demister design is improper, may in emission gases, carry residual muriate secretly, making has the smell of the SYNTHETIC OPTICAL WHITNER of being similar in the exhaust.So demister also is a very important system integral part.
Sludge silt novel material synthesis technique has following two kinds:
(1) active calcium oxide synthesis technique, be used to produce active calcium oxide: Wingdale, acidifying iron, dehydration aluminium strong acid salt, the non-aluminium strong acid salt of dehydration and the above-mentioned pretreated sludge silt that contains calcium hydroxide are mixed back preheating and decomposition according to a certain percentage, send into rotary kiln adding fuel again and calcine, the cooling back obtains to contain the solids of calcium oxide.
Calcining temperature is 650~1100 ℃, and its product makes particulate state active oxidation calcium product through the granulation of adhesive-free tablets press again, and these goods are back to described mud pre-treatment.
The weight part of the active material that is added in the described active calcium oxide synthesis technique is respectively: dehydration aluminium strong acid salt 10-30 weight part, non-aluminium strong acid salt 5-9 weight part dewaters.
The embodiment of novel material synthesis technique: it is as follows to produce one ton of needed main raw material(s) of active calcium oxide and technology:
Sludge silt 1080Kg,
Wingdale 220Kg,
Acidifying iron 70Kg,
Dehydration aluminium strong acid salt 25Kg,
The non-aluminium strong acid salt 5Kg that dewaters,
Make the active calcium oxide finished granule through calcining (calcining temperature is 650~1100 ℃, 5~10 hours time), granulation process, as shown in Figure 1.This calcium oxide is re-used in water ratio increases the calcium mummification for the 70%-85% municipal sludge pre-treatment.
(2) cement synthesis technique, be used to produce cement: Wingdale, clay, silica, ferric oxide (or iron powder) and described sludge silt are mixed back preheating and decomposition according to a certain percentage, sending into rotary kiln adding fuel again calcines, the cooling back obtains cement clinker, with material mixing such as gypsum and other slag, flyash, obtain finished cement again through behind the grinding.
Specific embodiment: it is as follows to produce one ton of needed main raw material(s) of cement:
Wingdale 756Kg,
Clay 220Kg,
Silica 60Kg,
Ferric oxide 30Kg,
Gypsum 35Kg,
Sludge silt 324Kg.
Just replace 30% Wingdale, after 1100 ℃~1250 ℃ calcinings, adopt conventional cement production process can produce finished cement, as shown in Figure 2 with sludge silt.
The sludge treatment thing is carried out chemical analysis, and its calcium oxide content can be replaced with calcium oxide in the common cement raw material Wingdale up to 50%, and technology of the present invention adopts sludge treatment thing replace lime stone is prepared burden according to this test-results.Test raw materials used chemical ingredients and see Table 1.
Be simulated experiment situation as much as possible, this experiment selects for use two kinds of clay-type substance to prepare burden to inquire into the match condition of sludge treatment thing and different sorts stock yard; Simultaneously, experiment designs three proportionings altogether, simulates the low silicon rate batching of shaft kiln high saturation ratio respectively, silicon rate batching in the saturation ratio in the common rotary kiln, gives and decomposes the high silicon rate batching of the low saturation ratio of kiln, is referred to as 1#, 2#, 3# respectively; Concrete proportioning situation sees Table 2, grog chemical ingredients and mineral composition see Table 3.
The burn-ability experiment is undertaken by international GB9965-88, carry out simultaneously the XRD test rapidly in the free ca test, carry out petrographic investigation to obtaining grog by cement petrofacies testing procedures, three groups of raw material are carried out DTA-TG respectively analyze in air atmosphere following of 1400 ℃, 1450 ℃ firing temperatures.
Table 1: experimental raw chemical constitution
??Loss ??SiO 2 ??Al 2O 3 ??Fe 2O 3 ??CaO ??MgO ??∑
The sludge treatment thing ??29.58 ??7.39 ??1.54 ??0.67 ??56.10 ??3.67 ??98.95
Clay ??4.19 ??69.10 ??14.09 ??6.17 ??2.36 ??1.42 ??97.33
Shale ??5.36 ??60.34 ??16.13 ??9.26 ??2.92 ??2.24 ??96.25
Iron powder ??1.08 ??23.76 ??4.83 ??65.19 ??2.81 ??0.90 ??98.57
Table 2: each raw-meal ingredient of filling a prescription
Table 3: grog chemical ingredients and mineral composition
Burn-ability test experiments result:
Burn till at 1300 ℃, 1350 ℃, 1400 ℃, 1450 ℃ four temperature spots respectively testing three kinds of proportionings, it is as shown in table 4 that institute obtains grog free ca test result:
Table 4: free ca test result
When 1350 ℃ in visible three kinds of raw material of table 4 burn till in its grog free calcium contents drop to substantially about 3wt%, do not contain free ca substantially in 1400 ℃ of its grogs when burning till; Consider in three kinds of raw material all not add any mineralizer, therefore, can judge that carrying out cement raw mix proportioning with this sludge treatment thing as raw material can have preferable burn-ability index.
Hot analytical test experimental result:
All carry out the DTA---TG test to three kinds than sample, three samples of DTA---TG analysis revealed all contain a large amount of calcium hydroxides, and being embodied in it, bigger heat absorption paddy and weightlessness-machine are all arranged near 480 ℃ is calcium hydroxide at this temperature section dehydration becoming calcium oxide.By comparison, the lime carbonate heat absorption paddy of sample in 770 ℃~780 ℃ scopes is relative all less with weightless value.
Be the regeneration of final material promptly, essential substance modification is provided in the stage that sludge drying is handled.And with the generation of the material behind the sludge drying, two independent parts of implementing have been carried out technology and have been synthesized.
Test-results according to above (cement matrix key lab of national building materials research institute), determine the technological line of this patent, changed in the past that sludge drying and material generate, two portions are independently implemented the energy that causes, material, many-sided waste such as artificial.

Claims (4)

1. method of utilizing cement rotary kiln to handle municipal sludge, it is characterized in that: this method comprises mud pre-treatment and sludge silt novel material synthesis technique, wherein:
The mud pre-treatment is to add active calcium oxide in mud, mud is carried out drying, dehydration, deodorizing, modification, solved the leakage problems in the transportation of sludge silt effectively, reduced volume, and reach the solid content standard that the cement rotary kiln secondary clacining can bear, the physical condition that produces novel material necessity is provided for novel material is synthetic;
The sludge silt novel material is synthetic be divided into into:
(1) active calcium oxide synthesis technique, be used to produce active calcium oxide: Wingdale, acidifying iron, dehydration aluminium strong acid salt, the non-aluminium strong acid salt of dehydration and the above-mentioned pretreated sludge silt that contains calcium hydroxide are mixed back preheating and decomposition according to a certain percentage, sending into rotary kiln adding fuel again calcines, the cooling back obtains to contain the solids of active calcium oxide, and this solids is back to described mud pre-treatment;
(2) cement synthesis technique, be used to produce cement: Wingdale, clay, silica, ferric oxide or iron powder and the described pretreated sludge silt that contains calcium hydroxide are mixed back preheating and decomposition according to a certain percentage, sending into rotary kiln adding fuel again calcines, the cooling back obtains cement clinker, mix with gypsum and other slag, fly ash material again, obtain finished cement through behind the grinding.
2. the method for utilizing cement rotary kiln to handle municipal sludge according to claim 1; it is characterized in that: the calcining temperature in the described active calcium oxide synthesis technique is 650~1100 ℃, and its product makes particulate state active oxidation calcium product through the granulation of adhesive-free tablets press again.
3. the method for utilizing cement rotary kiln to handle municipal sludge according to claim 1, it is characterized in that: the weight part of the active material that is added in the described active calcium oxide synthesis technique is respectively: dehydration aluminium strong acid salt 10-30 weight part, non-aluminium strong acid salt 5-9 weight part dewaters.
4. the method for utilizing cement rotary kiln to handle municipal sludge according to claim 1, it is characterized in that: described mud pre-treatment also comprises the gas processing step of the gas that produces in the treating processes being carried out harmless processing.
CNB2005100691886A 2005-05-12 2005-05-12 Method and device of treating urban mud by using cement rotary kiln CN100398472C (en)

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CN101172790A (en) * 2007-10-26 2008-05-07 尹小林 Novel technique for producing concrete by using hygroscopic state sewage sludge waste slag B grade mixture material
CN102050586B (en) * 2010-11-08 2012-10-31 华南理工大学 Method for producing silicate cement by utilizing urban sewage plant sludge
CN102329059B (en) * 2011-08-09 2013-08-28 宾韬 Method for manufacturing environmental-friendly renewable energy by sludge
CN102718374A (en) * 2012-05-31 2012-10-10 郭涵 Method of utilizing vertical type cement kiln to process sludge
CN102718378B (en) * 2012-07-06 2014-01-01 沈阳航空航天大学 Method of cement kiln co-processing for calcium-added and passivated town sludge
CN104176953B (en) * 2013-05-27 2017-08-25 江苏国祯环保科技有限公司 The method that cement is produced using urban domestic sewage sludge
CN104355575B (en) * 2014-10-22 2016-04-06 浙江工业职业技术学院 Flyash printing and dyeing sludge geology polymer material and preparation method thereof
CN104478192A (en) * 2014-12-11 2015-04-01 北京建筑材料科学研究总院有限公司 Sludge material drying method applied to cement kiln calciner
CN104609685B (en) * 2015-01-28 2016-09-21 大连东泰有机废物处理有限公司 The method of cement kiln synergic processing anaerobically digested sludge
CN106323012A (en) * 2015-07-09 2017-01-11 武汉艾蒙窑炉技术有限公司 Rotary preheater and rotary kiln
CN105674734A (en) * 2016-03-29 2016-06-15 新疆广汇中化能源技术开发有限公司 Rotary kiln device
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
CN106186747A (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 high strength clinker

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