CN106635238A - Method for preparing light-weight particles from civil sludge and application thereof - Google Patents
Method for preparing light-weight particles from civil sludge and application thereof Download PDFInfo
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- CN106635238A CN106635238A CN201611234971.8A CN201611234971A CN106635238A CN 106635238 A CN106635238 A CN 106635238A CN 201611234971 A CN201611234971 A CN 201611234971A CN 106635238 A CN106635238 A CN 106635238A
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- sludge
- light granules
- mixed material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/029—Salts, such as carbonates, oxides, hydroxides, percompounds, e.g. peroxides, perborates, nitrates, nitrites, sulfates, and silicates
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to technical field of sludge reclamation, and concretely discloses a method for preparing light-weight particles from civil sludge and application thereof. The method at least comprises the following steps of weighing the following ingredients in percentage by mass: 45 to 80 percent of dry sludge, 12.5 to 45.5 percent of additives and 7.5 to 12.5 percent of bonding agents. The weighed dry sludge is treated into powder; then, the additives are added; material mixing treatment is performed to obtain a first mixed material; a proper number of solvents and bonding agents are added into the first mixed material; the material mixing treatment is performed to obtain a second mixed material; the second mixed material is treated into a particular blank body; drying treatment is performed; the particular blank body subjected to drying treatment is subjected to sintering treatment. The light-weight particles provided by the invention have the characteristics of few cracks, surface smoothness, low density, light weight, good water absorption performance, argillization difficulty, high pressure-resistant intensity (being higher than 6MPa) and the like, and is suitable for being applied to roof flower culture soil bases.
Description
Technical field
The present invention relates to recycling sludge processing technology field, more particularly to a kind of municipal sludge prepares light granules
Methods and applications.
Background technology
Municipal sludge is mainly made up of organic matter, inanimate matter and substantial amounts of moisture.Divided according to chemical constituent,
Can be divided into：Plant nutrient (such as carbon, hydrogen, nitrogen, phosphorus, potassium)；Inorganic nutrient substance (such as calcium, magnesium, sulphur)；Organic substance
(such as protein, fat)；Polluter (such as organic matter and heavy metal arsenic, cadmium, chromium, lead, copper).
Without the moisture percentage in sewage sludge of any process typically more than 99%, if after with machine dehydration, its moisture content can
To drop to 80% or so.If carrying out thickening again, moisture content can be reduced to 70% or so, therefore, sludge components are with water
It is main.
And according to the existing way of sludge water content, four class moisture can be divided into：
1) sludge Free water or Interstitial Water：Free water is moisture present in large space between mud granule and particle,
Can flow freely, account for sludge water content total amount 70% or so, easily remove；
2) sludge capillary combines water：Capillary water refer on solid particle contact surface by capillary pressure combine, account for sludge water content
20% or so；
3) Sludge Surface absorption water：Surface adsorption water refers to the moisture being attached on sludge little particle surface, accounts for sludge water content
7% or so；
4) sludge internal water or Biological water：Internal water refers to the liquid inside microbial cell, is difficult in dry run
It is removed, this part water in combination with solid particle, constitutes about the 3% of sludge water content typically by chemical force.
As the continuous development that human material lives, municipal sludge amount are more and more, how to process sludge and have become pendulum
In a great problem of each Development of large city.
Existing Treatment of Sludge mode, generally comprises drying sludge and recycling treatment and sludge incineration are processed.
Wherein, drying sludge is to utilize artificial heat, in the method that industrial equipment carries out deep dehydration to sludge.Can be
As preprocessing means before sludge composting, burning or hot chemical treatment, also can by dry products directly as agricultural fertilizer or certain
The auxiliary fuel of a little industrial departments.
The dry run of sludge can be divided into three phases：
First stage is the warm-up phase of sludge.In this stage, the temperature of sludge starts to increase from surface, while sludge table
The moisture in face can also accelerate evaporation, until it reaches certain temperature.And this temperature is relevant with several factors, such as surrounding enviroment
Temperature and humidity etc., also referred to as wet-bulb temperature, this temperature is general all lower slightly than environment temperature.
Second stage is constant rate drying period.In this stage, due to the moisture of Sludge Surface it is higher, so drying box is provided
Energy almost all be used for vaporizing the moisture of Sludge Surface.The rate of drying in this stage depends on the evaporation of Sludge Surface moisture
Speed, is the surface vaporization control stage.
Phase III is falling rate drying period.In this stage, the moisture of Sludge Surface evaporates and completes substantially, sludge water content
Evaporation is internally shifted from Sludge Surface, is evaporated the heat of moisture and is needed to pass to interior zone by solid, and internal moisture passes through
Solid Void to outside diffusion, evaporation rate also slowly slow down.The speed of this stage rate of drying evaporates with sludge internal moisture
Speed it is relevant, belong to diffusion inside control the stage.
And sludge incineration is the process for thoroughly being carbonized the organic matter in sludge using high temperature.In this process, not only
The volume of sludge can be substantially reduced, and the pathogen in the middle of sludge etc. can be killed thoroughly at high temperature.Sludge incineration
The heat that heat is discharged from the extraneous and carbonization process of itself.
Sludge incineration is under conditions of proper temperature and atmosphere, to crack organic matter in sludge and the anti-of burning occurs
Should.It is the most thorough to burn processing method as core, the organic matter in sludge can be made all to be carbonized, kill pathogen, and most
Reduce sludge volume in big degree ground.
After drying sludge process, sludge can not be thoroughly solved because having organic matter and inorganic matter and toxic heavy metal
Problem；Same sludge incineration also brings along the product hand after environmental pollution, and sludge incineration flips will ftracture even
Airborne dust, it is impossible to well by sludge coagulating is agglomerating or bulk.Either drying sludge or sludge incineration, all can not thoroughly solve
The problem that certainly municipal sludge is present.
In terms of the light granules of roof garden, common fertilizer is more open, and the wind on roof is larger, it is easy to by it
Blow away；Further, common fertilizer soil erosion is more, sewer pipe is easily blocked.Therefore, common fertilizer is difficult to meet its requirement.
Then it is thought that will be used in roof garden light soil after recycling sludge.
Although but can preserve organic matter after sludge convection drying at present, in being used in roof garden, hardness and
Water imbibition is unable to reach requirement；Or burning becomes light granules and similarly cannot for its water imbibition of roof garden and hardness
Reach requirement.And, the sludge after being either dried or burning is easily broken into powder, for easy airborne dust during roof
Even dispelled；The excessive load-bearing that can increase house of sludge moisture storage capacity of powder.
The content of the invention
Cannot meet roof etc. for easy airborne dust, hardness and water imbibition present in existing sludge light granules process
Require, embodiments provide a kind of method that municipal sludge prepares light granules.
And, the embodiment of the present invention additionally provides the application of the light granules.
In order to reach foregoing invention purpose, the embodiment of the present invention employs following technical scheme：
A kind of method that municipal sludge prepares light granules, at least comprises the following steps：
Weigh the following component of weight/mass percentage composition：
Dewatered sludge 45%～80%；
Additive 12.5%～45.5%；
Binding agent 7.5%～12.5%；
Wherein, in terms of the additive quality 100%, the additive includes following components：
White carbon 30%～58%；
Clay 28%～40%；
Diatomite 14%～35%；
The dewatered sludge for weighing process is powdered, add the white carbon, clay, diatomite, mixing treatment,
Obtain the first mixed material；
Appropriate solvent and the binding agent, mixing treatment is added to obtain the second mixture in first mixed material
Material；
Second mixed material is processed into graininess idiosome, and carries out dried process；
The graininess idiosome after by dried process is sintered.
And correspondingly, application of the light granules that as above prepared by method in flower planting soil matrix.
The method that municipal sludge provided in an embodiment of the present invention prepares light granules, based on municipal sludge, knot
Close additive and binding agent, the light granules of preparation have that crackle is few, surface is smooth, density is little, light weight, water absorbing properties are good
And the features such as be difficult argillization, compression strength and reach more than 6MPa；And in the preparation method, raw material sources are convenient, preparation technology
The features such as condition is simple, and a large amount of municipal sludges can be consumed, it is adapted to batch production and is applied to the soil matrix of flower planting
In, such as roof garden soil matrix.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
The embodiment of the present invention provides a kind of method that municipal sludge prepares light granules.
Methods described is at least comprised the following steps：
Weigh the following component of weight/mass percentage composition：
Dewatered sludge 45%～80%；
Additive 12.5%～45.5%；
Binding agent 7.5%～12.5%；
Wherein, in terms of the additive quality 100%, the additive includes following components：
White carbon 30%～58%；
Clay 28%～40%；
Diatomite 14%～35%；
The dewatered sludge for weighing process is powdered, add the white carbon, clay, diatomite, mixing treatment,
Obtain the first mixed material；
Appropriate solvent and the binding agent, mixing treatment is added to obtain the second mixture in first mixed material
Material；
Second mixed material is processed into graininess idiosome, and carries out dried process；
The graininess idiosome after by dried process is sintered.
Preferably, the granularity of the light granules is 2mm～5mm, and particle is too small, easily from the pertusate splendid attire carrier of tool
In expose, particle is excessive, is not suitable for the plantation of flowers.
Preferably, the clay is kaolin.Clay plays a part of to promote light granules shaping in component.
Preferably, the binding agent is PVA binding agents.
Above-described embodiment provide light granules, with crackle it is few, surface is smooth, density reaches 0.7～0.8kg/dm3、
Light weight, water absorbing properties are good and the features such as be difficult argillization airborne dust, compression strength and reach more than 6MPa.
The above-mentioned method for preparing light granules is further described in detail below.
In any embodiment, dewatered sludge is obtained by municipal sludge dried process.
It is above-mentioned dewatered sludge is processed into powder before, also include for dewatered sludge being dried process.
In one embodiment, the dried process temperature of dewatered sludge is 60 DEG C～80 DEG C.
Sludge after dried process, is pulverized in sludge using milling apparatus such as ball mill or other lapping devices
End, lapping mode can be any, mainly can be feasible by sludge grind into powder.
In a preferred embodiment, white carbon, clay and diatomite should be powder, so as to batch mixing it is uniform.
In a preferred embodiment, solvent is running water or deionized water.Add the purpose master of running water or deionized water
If in order that the first mixed material makes the second mixed material with viscosity.
In any embodiment, the first mixed material is powder, and the second mixed material has certain viscosity.
In a preferred embodiment, the particle diameter of graininess idiosome is 3mm～10mm.When this is mainly follow-up sintering process,
The volume of grain can reduce, it is to avoid the particle diameter of bulk particle is too small or excessive and cause final products to use.
In a preferred embodiment, in dry run, the temperature of dried process is 40 DEG C～70 DEG C to the particle of bulk.
Preferably, the temperature of the sintering processes is 800 DEG C～1000 DEG C, the time at least 10min of the sintering processes.
Under the sintering temperature and sintering time, the light granules compression strength for obtaining reaches 6MPa, is difficult to be broken into powder.
Light granules that the above embodiment of the present invention is provided and preparation method thereof, high temperature sintering after raw material is mixed is obtained
Product have that crackle is few, surface is smooth, density is little, light weight, water absorbing properties are good and be difficult argillization, compression strength and reach
The features such as more than 6MPa, and the features such as raw material sources are convenient, preparation process condition is simple, and a large amount of municipal sludges can be consumed,
It is adapted to batch production and popularization and application.
Further, the lightweight that the method for preparing light granules with municipal sludge that the above embodiment of the present invention is provided is obtained
Particle, in can be used for the soil matrix of flower planting, such as roof garden soil matrix.
When specifically used, light granules can be soaked in nutrient solution, be then transferred to flowerpot or garden surface
As soil matrix, either it is directly loadable into flowerpot or garden, after plantation flowers, periodically Ensure Liquid liquid and moisture thereto.
In order to preferably embody the method that municipal sludge provided in an embodiment of the present invention prepares light granules, below by
Multiple embodiments are further illustrated.
Embodiment 1
A kind of light granules, the component for adopting following weight/mass percentage composition is prepared for raw material：
Dewatered sludge 50%；
Additive 40%；
PVA 10%；
Wherein, in terms of the additive quality 100%, the additive includes following components：
White carbon 58%；
Kaolin 28%；
Diatomite 14%.
The method for preparing the light granules, comprises the steps：
1) each component is weighed according to the component in embodiment 1；
2) by the dewatered sludge for weighing in 60 DEG C of environment dried process, be then ground to powder；
3) white carbon for weighing, kaolin and diatomite and sewage sludge powder are carried out into mixing treatment, obtains the first mixture
Material；
4) add appropriate deionized water and PVA binding agents, mixing treatment in first mixed material, obtain second
Mixed material, the second mixed material has certain viscosity；
5) the second mixed material is put into mould, makes graininess idiosome, then graininess idiosome is placed in into 60 DEG C of rings
Dried process in border；
6) the graininess idiosome after dried process is placed in 900 DEG C and sinters 20min, natural cooling, you can obtain lightweight
Particle.
Performance detection is carried out to light granules prepared by embodiment 1, detection data is as shown in table 1.
Embodiment 2
A kind of light granules, the component for adopting following weight/mass percentage composition is prepared for raw material：
Dewatered sludge 80%；
Additive 12.5%；
PVA 7.5%；
Wherein, in terms of the additive quality 100%, the additive includes following components：
White carbon 50%；
Kaolin 30%；
Diatomite 20%.
The method for preparing the light granules, comprises the steps：
1) each component is weighed according to the component in embodiment 2；
2) by the dewatered sludge for weighing in 80 DEG C of environment dried process, be then ground to powder；
3) white carbon for weighing, kaolin and diatomite and sewage sludge powder are carried out into mixing treatment, obtains the first mixture
Material；
4) add appropriate deionized water and PVA binding agents, mixing treatment in first mixed material, obtain second
Mixed material, the second mixed material has certain viscosity；
5) the second mixed material is put into mould, makes graininess idiosome, then graininess idiosome is placed in into 60 DEG C of rings
Dried process in border；
6) the graininess idiosome after dried process is placed in 800 DEG C and sinters 20mim, natural cooling, you can obtain lightweight
Particle.
Performance detection is carried out to light granules prepared by embodiment 2, detection data is as shown in table 1.
Embodiment 3
A kind of light granules, the component for adopting following weight/mass percentage composition is prepared for raw material：
Dewatered sludge 42%；
Additive 45%；
PVA 13%；
Wherein, in terms of the additive quality 100%, the additive includes following components：
White carbon 30%；
Kaolin 40%；
Diatomite 30%.
The method for preparing the light granules, comprises the steps：
1) each component is weighed according to the component in embodiment 3；
2) by the dewatered sludge for weighing in 60 DEG C of environment dried process, be then ground to powder；
3) white carbon for weighing, kaolin and diatomite and sewage sludge powder are carried out into mixing treatment, obtains the first mixture
Material；
4) add appropriate deionized water and PVA binding agents, mixing treatment in first mixed material, obtain second
Mixed material, the second mixed material has certain viscosity；
5) the second mixed material is put into mould, makes graininess idiosome, then graininess idiosome is placed in into 60 DEG C of rings
Dried process in border；
6) the graininess idiosome after dried process is placed in 1000 DEG C and sinters 20min, natural cooling, you can obtain lightweight
Particle.
Performance detection is carried out to light granules prepared by embodiment 3, detection data is as shown in table 1.
Embodiment 4
A kind of light granules, the component for adopting following weight/mass percentage composition is prepared for raw material：
Dewatered sludge 45%；
Additive 42.5%；
PVA 12.5%；
Wherein, in terms of the additive quality 100%, the additive includes following components：
White carbon 33.3%；
Kaolin 33.3%；
Diatomite 33.3%.
The method for preparing the light granules, comprises the steps：
1) each component is weighed according to the component in embodiment 4；
2) by the dewatered sludge for weighing in 70 DEG C of environment dried process, be then ground to powder；
3) white carbon for weighing, kaolin and diatomite and sewage sludge powder are carried out into mixing treatment, obtains the first mixture
Material；
4) add appropriate deionized water and PVA binding agents, mixing treatment in first mixed material, obtain second
Mixed material, the second mixed material has certain viscosity；
5) the second mixed material is put into mould, makes graininess idiosome, then graininess idiosome is placed in into 80 DEG C of rings
Dried process in border；
6) the graininess idiosome after dried process is placed in 1000 DEG C and sinters 20min, natural cooling, you can obtain lightweight
Particle.
Performance detection is carried out to light granules prepared by embodiment 4, detection data is as shown in table 1.
The performance test data of light granules prepared by 1 embodiment of table 1～4
As seen from Table 1, embodiment 1～4 combines light granules prepared by additive using municipal sludge, and compression strength reaches
6.0MPa and more than, water absorption rate is more than 50%, and the smooth flawless in light granules surface, and density reaches 0.7kg/dm3。
In order to verify the impact of the additive of the embodiment of the present invention, the performance of light granules made by sintering temperature pair, under
Face is explained by multiple comparative examples.
(1) impact of the different formulations to light granules performance
Preparation preparation method according to above-mentioned 1～4 any embodiment prepares light granules, wherein, light granules material
Each composition composition proportion is 1:1, binding agent usage amount accounts for the 10% of material gross mass, refers to table 2.
The performance of light granules obtained in the different formulations of table 2
| Formula species | Made by light granules apparent form | Compression strength/MPa |
| Sludge+white carbon | There is a little crackle | 4.8 |
| Sludge+kaolin | There is a little crackle | 3.2 |
| Sludge+diatomite | Have compared with multiple crackses and frangible | 3.9 |
| Sludge+white carbon+diatomite | Surface is smooth | 5.4 |
| Sludge+kaolin+diatomite | Surface is smooth | 5.0 |
| Sludge+kaolin+white carbon+diatomite | Surface is smooth | 6.5 |
As known from Table 2, when formula is sludge+kaolin+white carbon+diatomite, obtained light granules surface is smooth,
And compression strength reaches 6.5MPa.Main cause is that white carbon is SiO2, the hardness of sludge can be improved, and it is kaolinic
Main component is 2SiO2●Al2O3●2H2O, can be such that sludge is preferably molded.
(2) impact of the different sintering temperatures to light granules performance
Remaining prepares light according to the preparation method of above-mentioned 1～4 any embodiment in addition to sintering temperature is according to table 3 Suo Shi
Matter particle, wherein, each composition composition proportion of light granules material is 1:1, binding agent usage amount accounts for material gross mass
10%, refer to table 3.
The performance of light granules obtained in the different sintering temperatures of table 3
As known from Table 3, when temperature is below 400 DEG C, the quality and color of idiosome are not changed significantly, and are illustrated now
Organic matter in idiosome is not also decomposed, and simply moisture therein and volatile material are evaporated.It is not reaching to burn
Purpose, it is undesirable.
When temperature is at 500 DEG C to 800 DEG C, although change significantly in quality, but its hardness is inadequate.Illustrate now
Organic matter in idiosome starts to decompose at high temperature, but many spaces can be also produced inside sludge, causes to burn till the hard of idiosome
Degree declines.
At 900 DEG C to 1000 DEG C, the surface of idiosome particle can generate certain fused mass, and the space between particle can be by it
Progressively it is full of.With the further raising of temperature, the fused mass of generation can increase, and the voidage inside idiosome can be reduced.In idiosome
After portion's voidage is reduced, can become closely knit between particle, and the fused mass that high temperature is produced has certain cohesive force, makes particle
Between mutual cohesive force strengthen, therefore its compression strength has and is obviously improved.
The mechanism of sintering process may be：When idiosome is sintered, the tension force on its surface is high, becomes in the structure of idiosome
Shape.When a temperature increases, the atom in idiosome obtains energy and migrates.As atom accelerates to collide, also can be again between particle
Combination, causes idiosome internal structure to change so that idiosome voidage is reduced, and intensity is increased, and density compacting becomes big, is finally completed burning
Process processed.
In the sintering procedure of idiosome, there is the control range of one section of temperature.In this condition, there is partial material in molten
State, temperature now is referred to as sintering temperature.All it is unfavorable for the success for sintering when sintering temperature is too high or too low, so obtains
Product have many not enough and defect.When temperature is also lower than sintering temperature lower limit, the product duration and degree of heating for obtaining is not enough, has embryo
Body voidage is excessive, and compression strength is low.Conversely, when the firing temperature sintering temperature upper limit is also high, the melting inside such idiosome
Thing is more, idiosome meeting softening transform, and the product for obtaining is that voidage is low, and very closely knit, intensity is significantly improved, but is unfavorable for plant
Take root growth.
(3) sludge and powder (include white carbon, clay and diatomite, wherein, be white carbon according to mass ratio：Clay：Silicon
Diatomaceous earth=1:1:1) impact of the different ratio to light granules performance
According to above-described embodiment and confirmatory experiment, according to 900 DEG C of calcining heat, in conjunction with the embodiments 1 preparation method, makes
The standby light granules filled a prescription such as table 4, and corresponding performance test is carried out, test result is as shown in table 4.
The performance of the light granules that the sludge of table 4 is obtained with powder different ratio
In table 4, scaling loss characteristic and water absorbing properties are inconsistent in quality, are that two sub-samplings are differed, and illustrate hereby.
Compression strength is whether judgement sample can bear certain pressure.Specific compression strength is with reference to national standard《It is disconnected
Split the measurement of modulus and breakdown strength》(GB/T3810.4-1999), resistance to compression is carried out on universal hydraulic testing machine to sample
The test of intensity.
Compression strength formula is：
P=Fmax/A × 10-3
In formula：The compression strength of P-idiosome, MPa；
The limit of Fmax-idiosome receives compressive load, KN；
The compression area of A-idiosome, m2。
As known from Table 4, at most, with the reduction of sludge quality, its loss on ignition is also being reduced the loss on ignition of pure sludge.Explanation
The reduction of idiosome quality is primarily due to the decomposition of organic matter in sludge.The idiosome that observation is burnt till finds：Pure sludge institute is into idiosome
Rough surface and very loose, after being soaked in water, it is easy to cave in water；And the proportioning of sludge and powder is 5:1 to 3:1 it
Between when, the compression strength for burning till idiosome is general, i.e., hardness is slightly improved, but can not meet requirement；When sludge and the proportioning of powder
3:1 to 1:When between 1, the compression strength for burning till idiosome reaches more than 6MPa, that is, hardness is significantly improved.So,
The sludge of the embodiment of the present invention and the quality proportioning of powder preferably 3:1～1:Between 1.
In table 4, the test process of water absorbing properties is：The light granules that six groups of experiments are obtained are taken respectively, and steaming is immersed in successively
In the middle of distilled water, 5min is stood；Then take out successively and with the weight that each sample is weighed after blotting paper sorbent surface moisture, its
In, the computing formula of water absorption rate：Water absorption rate=(quality-initial mass after water suction)/initial mass × 100%.
From table 4, when the proportioning of sludge and powder is 3:1～1:When between 1, water absorption rate height can cause the material to inhale
Receive certain nutrient solution.Therefore, the quality proportioning preferably 3 of embodiment of the present invention sludge and powder:1～1:1.
To the 6th group, the sludge 0.5023g after mummification is taken, its volume 0.39mL is measured after compressing tablet.Being calculated by density formula to do
The density of sludge is 1.29kg/dm3；Then will observe after the 6th group of dewatered sludge sintering, it is found that its volume is basically unchanged, but matter
Amount is reduced to 0.3021g, and it is 0.77kg/dm to be calculated by density formula and must burn till the density of idiosome3.Thus data can be seen that burning
Density into idiosome was greatly reduced compared with originally.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent or improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of method that municipal sludge prepares light granules, it is characterised in that at least comprise the following steps：
Weigh the following component of weight/mass percentage composition：
Dewatered sludge 45%～80%；
Additive 12.5%～45.5%；
Binding agent 7.5%～12.5%；
Wherein, in terms of the additive quality 100%, the additive includes following components：
White carbon 30%～58%；
Clay 28%～40%；
Diatomite 14%～35%；
The dewatered sludge for weighing process is powdered, the white carbon, clay, diatomite are added, mixing treatment is obtained
First mixed material；
The binding agent and appropriate solvent, mixing treatment is added to obtain the second mixed material in first mixed material；
Second mixed material is processed into graininess idiosome, and carries out dried process；
The graininess idiosome after by dried process is sintered.
2. the method for preparing light granules with municipal sludge as claimed in claim 1, it is characterised in that：The light granules
Granularity is 2mm～5mm.
3. the method for preparing light granules with municipal sludge as claimed in claim 1, it is characterised in that：The clay is kaolinite
Soil.
4. the method for preparing light granules with municipal sludge as claimed in claim 1, it is characterised in that：The binding agent is
PVA。
5. the method for preparing light granules with municipal sludge as claimed in claim 1, it is characterised in that：The sintering processes
Temperature is 800 DEG C～1000 DEG C, the time at least 10min of the sintering processes.
6. the method for preparing light granules with municipal sludge as claimed in claim 1, it is characterised in that：The graininess idiosome
Particle be 3mm～10mm.
7. the method for preparing light granules with municipal sludge as claimed in claim 1, it is characterised in that：The dried process
Temperature is 40 DEG C～70 DEG C.
8. the method for preparing light granules with municipal sludge as claimed in claim 1, it is characterised in that：The solvent is for originally
Water or deionized water.
9. the light granules that prepared by the method for preparing light granules with municipal sludge as described in any one of claim 1～8 exist
Application in flower planting soil matrix.
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| CN201611234971.8A CN106635238B (en) | 2016-12-28 | 2016-12-28 | Method for preparing light particles from municipal sludge and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611234971.8A CN106635238B (en) | 2016-12-28 | 2016-12-28 | Method for preparing light particles from municipal sludge and application |
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| CN106635238A true CN106635238A (en) | 2017-05-10 |
| CN106635238B CN106635238B (en) | 2020-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110483093A (en) * | 2019-09-11 | 2019-11-22 | 武汉钢铁有限公司 | Steel plant's comprehensive wastewater sludge base water-keeping material and preparation method thereof |
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| CN102757255A (en) * | 2012-07-13 | 2012-10-31 | 哈尔滨工业大学 | Method for preparing lightweight ceramisite by utilizing water supply sludge and sewage sludge |
| CN105174915A (en) * | 2015-08-20 | 2015-12-23 | 包头市正唐环保产业有限公司 | Technology utilizing waste solids to prepare ceramic particles used as soilless culture substrates |
| CN105541380A (en) * | 2015-12-21 | 2016-05-04 | 中国科学院过程工程研究所 | Fly ash coated sludge ceramsite and preparation method therefor |
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| CN102757255A (en) * | 2012-07-13 | 2012-10-31 | 哈尔滨工业大学 | Method for preparing lightweight ceramisite by utilizing water supply sludge and sewage sludge |
| CN105174915A (en) * | 2015-08-20 | 2015-12-23 | 包头市正唐环保产业有限公司 | Technology utilizing waste solids to prepare ceramic particles used as soilless culture substrates |
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| CN110483093A (en) * | 2019-09-11 | 2019-11-22 | 武汉钢铁有限公司 | Steel plant's comprehensive wastewater sludge base water-keeping material and preparation method thereof |
| CN110483093B (en) * | 2019-09-11 | 2022-02-08 | 武汉钢铁有限公司 | Comprehensive wastewater sludge-based water retention material for steel plant and preparation method thereof |
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| CN106635238B (en) | 2020-05-29 |
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