CN109851265A - A kind of controllable sludge silt soil matrix haydite of hole and preparation method thereof - Google Patents
A kind of controllable sludge silt soil matrix haydite of hole and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of controllable sludge silt soil matrix haydites of hole, are made of the raw material of following weight percent: sludge 45~55%, dregs 30~40%, shale 5~10%, rice husk 2%, hole adjusting control agent 4~6%, fluxing agent 0.2~2%；The hole adjusting control agent is compounded by ten phosphate dihydrate salt, potassium dihydrogen phosphate, boric acid therein at least two.Preparation method includes the following steps: S1, by sludge dewatering；Dregs and shale carry out drying break process respectively；S2, dregs, shale, rice husk, hole adjusting control agent and fluxing agent are uniformly mixed, are then uniformly mixed again with sludge；S3, spherical raw material are made in the mixture of step S2, are placed at shady and cool ventilation and are aged；S4, spherical raw material are placed in rotary kiln, first in 350~450 DEG C of 8~12min of preheating of temperature, then heat to 1100~1150 DEG C of 8~12min of roasting.The present invention carries out green resourceization disposition to the cities solid waste such as sewage sludge, architecture sediment and haydite is made, and is applied to the fields such as building materials, chemical industry, filtrate, plate, has good economic results in society.
Description
Technical field
The invention belongs to building material technical fields, and in particular to a kind of controllable sludge silt soil matrix haydite of hole and its system
Preparation Method.
Background technique
With the continuous propulsion of Urbanization in China, infrastructure construction goes from strength to strength, a large amount of city sewage and sludges
It is dealt carefully with solid wastes urgent needs such as architecture sediments.For city sewage and sludge, traditional anhydration and incineration is handled, and processing cost is high
The poisonous and harmful substances such as a large amount of dioxin, heavy metal can be also discharged simultaneously, secondary injury is caused to environment, and landfill etc. is handled
Method, and meeting polluted agricultural land, underground water etc.；For architecture sediment, impurity is more, and haze dirt is big, and arbitrarily stacking, landfill etc. are extensive
Processing method, can planning, management and environment to city bring many adverse effects.To realize the sustainable of environment and resource etc.
Development, the cities solid waste such as recycling, innoxious, minimizing disposition sewage sludge, architecture sediment are imperative.
Porous material has wide utilization prospect, can applying to using even porous haydite prepared by sludge, dregs
The industries such as work, building materials, filler, filtrate, while turning waste into wealth, added value also with higher.The country is to recycling sludge
Disposition aspect, is mostly the method using cooperative disposal, sewage sludge is added in rotary kiln of manufacture of cement etc., is handled
Efficiency comes first；Meanwhile the product of profession disposition sludge preparation consumes less sewage sludge, based on sludge brick etc. without abundant
It is limited to the effect for promoting the cities solid wastes such as disposal of resources sewage sludge using calorific value higher inside sludge.
The patent No. 201610477752.6 discloses a kind of sludge lightweight through-hole haydite, uses 20%~80% sludge,
5%~25% high viscous attapulgite clay, 2%~20% quick lime, 2%~20% atlapulgite, 2%~15% powdery are concave-convex
Stick foaming agent, 1%~10% cenosphere, 0.5%~5% expanded vermiculite and 0%~5% ferrous sulfate composition, system of the present invention
Standby cylindrical sludge lightweight through-hole haydite average bulk density is 720Kg/m3, water absorption rate 82%；The patent No.
201510603587.X discloses a kind of preparation method of sludge ceramsite, with 30%~40% city sewage and sludge, 35%~
45% shale, 5%~10% clay, 3%~8% cinder, 1%~2% bulking machine, 1%~2% aluminum oxide, 1%~
After 2% additive stirs and evenly mixs, roasted after the molding of drum-type molding machine.But the unbonded material composition of the above invention
With process flow that the stabilization of the pore structure of haydite and regulation are proposed to improve and be optimized, while to city sewage and sludge and building
The consumption of dregs is limited.
Summary of the invention
The object of the present invention is to provide a kind of controllable sludge silt soil matrix haydites of hole.
The controllable sludge silt soil matrix haydite of hole provided by the invention, is made: sludge of the raw material of following weight percent
45~55%, dregs 30~40%, shale 5~10%, rice husk 2%, hole adjusting control agent 4~6%, fluxing agent 0.2~2%；Institute
Hole adjusting control agent is stated to be compounded by ten phosphate dihydrate salt, potassium dihydrogen phosphate, boric acid therein at least two, hole adjusting control agent
Component and content difference obtain the different haydite in gap.
The sludge is the urban domestic sewage sludge of moisture content 45~55%.The dregs excavates base from construction site
The discarded clay in hole, moisture content≤20%.The discarded shale of digging, contains when the shale is from construction site smooth location
Water rate≤20%.
Preferably, the hole adjusting control agent by 8~14 parts by weight ten phosphate dihydrate salt and 1~4 parts by weight phosphoric acid
The ten phosphate dihydrate salt that potassium dihydrogen compounds perhaps 8~14 parts by weight compound or 8 with the boric acid of 1~4 parts by weight
The boric acid threes of ten phosphate dihydrate salt of~14 parts by weight, the potassium dihydrogen phosphate of 1~4 parts by weight and 1~4 parts by weight compound and
At the component and content difference of hole adjusting control agent obtain the different haydite in gap.The ten phosphate dihydrates salt is ten phosphate dihydrates
Trisodium or ten dihydrogen phosphate dihydrate potassium.
Preferably, the fluxing agent is iron oxide.
A method of the controllable sludge silt soil matrix haydite of above-mentioned hole is prepared, is included the following steps:
S1, original state sludge is dried to moisture content 45%~55% at 105 DEG C, dregs and shale are dried at 105 DEG C respectively
After be crushed to partial size less than or equal to 0.3mm；
S2, dregs, shale, rice husk, hole adjusting control agent and fluxing agent are uniformly mixed, are then uniformly mixed again with sludge,
Obtain the mixture of moisture content 20~25%；Control is adjusted by changing component and the content of hole adjusting control agent in this step
The gap of potting grain；
S3, the spherical raw material that the mixture of step S2 is made to 5~20mm of diameter, are placed in old at shady and cool ventilation after balling-up
Change for 24 hours；
S4, the spherical raw material after ageing are placed in rotary kiln, the first preheating 8 under the conditions of 350~450 DEG C of temperature~
12min then heats to 1100~1150 DEG C of 8~12min of roasting.
Preferably, the step S4 are as follows: spherical raw material are placed in industrial rotary kiln, in 400 DEG C of preheating 10min, then
In being warming up to 1150 DEG C of roasting 10min.
Since the moisture content of city sewage and sludge is 65%~85%, if without drying and dewatering processing, actual production
The sludge siccative consumed in the process will be very limited, it is difficult to meet the requirement that harmful substance minimizing is handled in sewage sludge, therefore
Original sample sewage sludge need to be dried；On the other hand, the molding granulation process of haydite needs to meet certain granulation moisture content,
Therefore it can use the participation moisture that sewage sludge is dried to after certain moisture content, relative to the complete drying particles of sludge, greatly
Reduce its energy consumption.Therefore, it is spare that sewage sludge is dried to moisture content 45%~55% at 105 DEG C.
Since the fineness of dregs directly affects plasticity, the mixing uniformity of haydite raw material, and then influence the molding of haydite
Complexity and Forming Quality, it is therefore desirable to break process be carried out to dregs, be crushed and use double-roll crusher and the broken machine of column.
It is granulated balling-up effect since dregs inner aqueous rate will have a direct impact on, while to reduce the energy consumption in production process,
It needs to carry out slag soil's water content drying and processing, this process utilizes the preheating in rotary kiln.
To enable the spherical haydite of preparation to form well, it is desirable that haydite has good plasticity, is determining material group
Under the premise of, this purpose can be reached by controlling its moisture content, while suitable moisture content can also reduce haydite and exist
The risk to crack during ageing, dry etc..
Since the moisture etc. after mixing inside raw material also needs the process of a diffusive migration, it is therefore desirable to give haydite raw material
Increase an ageing stage, the risk of haydite cracking when can be effectively reduced later period preheating sintering ceramsite.
Since sewage sludge is in the low-temperature prewarming stage, haydite raw material inside is mainly happens is that evaporation and the organic matter of moisture
Decomposed, but the organic matter inside haydite raw material is the main bleed ingredient that expansion is generated in haydite high-temperature calcination process,
Therefore to obtain porous ceramic grain matrix, the temperature of warm-up phase is unsuitable excessively high too long, therefore 350 are set by preheating temperature~
450 DEG C, preheating time is set as 8~12min.It is simultaneously to make haydite have be suitable for melt so that haydite is in high-temperature calcination process
Melt-viscosity is formed simultaneously the hard mineral skeleton such as mullite, should rationally control maturing temperature, therefore maturing temperature is arranged
It is 1100~1150 DEG C, calcining time is set as 8~12min.
In roasting process, iron oxide is reacted with reducing substances in the high temperature process can also generate oxygen while generating gas
Change ferrous iron, ferrous oxide can generate eutectic substance with the chemical substance of other inside haydite, and then reduce the firing temperature of haydite
Degree effectively lowers the firing energy consumption of haydite.
Compared with prior art, the invention has the following advantages:
(1) city sewage and sludge that the present invention uses, moisture content is high, harmful components are more and complicated, and traditional desiccation is burnt
It is high to burn cost of disposal, while a large amount of haze dirt and pernicious gas can be discharged, secondary injury can be caused to environment.Urban architecture dregs
Impurity is more, huddles the problems such as leaving about equally brings many adverse effects to environment.It is solid that the present invention can effectively improve above-mentioned city
Useless disposition benefit.
(2) present invention makes full use of the feature that the content of organic matter is high inside city sewage and sludge, provides for haydite good
Bleed medium provides good skeletal support medium for haydite, is using the high feature of silicon, aluminium equal size inside architecture sediment
Good pore structure is obtained, using compound hole adjusting control agent as the stabilization of haydite and optimization component, while iron oxide is added
So that haydite is formed suitable melt viscosity in high-temperature calcination process and reduces firing temperature.
(3) mixing granulation is carried out with the dregs after crushing drying after sludge uses original state sludge to slough partial moisture, is avoided
The high energy consumption of complete drying sludge, simplifies process flow, while a large amount of organic matter is that the firing of haydite mentions inside sludge
A large amount of calorific values have been supplied, the energy has been saved, moreover, the sintered heavy metal of sludge high temperature can be effectively secured to aluminosilicate net
It is environmentally friendly in network structure.
(4) gap of control haydite can be adjusted by changing component and the content of hole adjusting control agent in preparation process.
Haydite internal pore structure quantity is more, and pore-size is uniform, and quality is light, can be widely applied to haydite concrete, heat preservation
The building materials fields such as thermal insulation plate, non-burning brick, to the recycling of the cities such as sewage sludge, architecture sediment solid waste, minimizing and harmless
Changing disposition has positive progradation.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Specific embodiment
The present invention is described in further detail below, to enable those skilled in the art's refer to the instruction text being capable of evidence
To implement.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of a other elements or combinations thereof.
Embodiment 1
A kind of sludge silt soil matrix haydite, weight percentage, raw material include: sludge 45%, dregs 40%, shale
6%, rice husk 2%, hole adjusting control agent 5%, iron oxide 2%.Wherein, hole adjusting control agent forms are as follows: 14 parts by weight, ten phosphate dihydrate
Potassium dihydrogen, 2 parts by weight of phosphoric acid potassium dihydrogens composition, 3 part by weight of boric acid.
Steps are as follows for the preparation method of haydite:
S1, pre-treatment of raw material
S11, sewage sludge is pre-processed first, physics is dried for standby after breaking glue dehydration.
Since the moisture content of city sewage and sludge is high, and flocculence is presented, to reach sewage sludge minimizing, innoxious
The purpose of processing, it is necessary first to breaking emulsion and dewatering processing be carried out to sewage sludge, sewage sludge demulsification process will use auger
Machine carries out physics demulsification, and drying and dewatering process will utilize rotary kiln waste heat, to control suitable moisture content 45%.
S12, clay is pre-processed, drying is crushed spare.
The quality of clay is softer, carries out break process to it using double-roll crusher, can be by adjusting double roller spacing tune
The partial size of the broken clay particle of section, broken clay particle size controlling is in 0~0.3mm.
S13, by shale drying it is broken after it is spare.
Relative to clay, the quality of shale is harder, therefore break process, broken page are carried out to it using the broken machine of column
Rock grain diameter is controlled in 0~0.3mm.
S2, according to said ratio, dregs, shale, rice husk, hole adjusting control agent and fluxing agent are uniformly mixed, then again with
Sludge is uniformly mixed, and obtains the mixture of moisture content 20~25%.
S3, granulation, ageing drying
Using combined type pelletizer, said mixture is made spherical, the size of raw material ball controls between 5~25mm,
It is placed at shady and cool ventilation and is aged after balling-up, ageing process can make moisture inside haydite raw material, skeleton component, fluxing group
Point, the diffusion of the fine particles such as bleed component, steady gas component, migration, be conducive to the sintering in later period.
S4, spherical raw material are fired into haydite
Burning equipment use plug-in type rotary kiln, 400 DEG C of preheating temperature, preheating time 10min, 1150 DEG C of maturing temperature,
Calcining time 10min obtains target product sludge silt soil matrix haydite.
Moisture loss mainly occurs in cold stage (room temperature~300 DEG C)；Middle thermophase (300 DEG C~900 DEG C) chemicals
Oxidative decomposition takes place in matter, and gas starts largely to generate, and the formation for haydite multi-pore structure provides condition；High temperature rank
Section (900~firing temperature) generates the cenotypes such as mullite, the formation of new span while chemical substance continues oxygenolysis
Intensity for haydite matrix provides effective guarantee.
Embodiment 2
A kind of even porous sludge silt soil matrix haydite, weight percentage, raw material include: sludge 55%, dregs
30%, shale 8.7%, rice husk 2%, hole adjusting control agent 4%, iron oxide 0.3%.Wherein hole adjusting control agent forms are as follows: 8 parts by weight
Ten phosphate dihydrate trisodiums, 4 parts by weight of phosphoric acid potassium dihydrogens, 4 part by weight of boric acid.
Haydite preparation method: step S1-S3 is the same as embodiment 1；
S4, spherical raw material are fired into haydite
Burning equipment uses plug-in type rotary kiln, 400 DEG C of preheating temperature, preheating time 8min, 1100 DEG C of maturing temperature, roasts
Time 10min is burnt, target product sludge silt soil matrix haydite is obtained.
Embodiment 3
A kind of even porous sludge silt soil matrix haydite, weight percentage, raw material include: sludge 48%, dregs
33%, shale 10%, rice husk 2%, hole adjusting control agent 6%, iron oxide 1%.Wherein hole adjusting control agent forms are as follows: 14 parts by weight ten
Phosphate dihydrate trisodium, 1 parts by weight of phosphoric acid potassium dihydrogen, 1 part by weight of boric acid.
Haydite preparation method: step S1-S3 is the same as embodiment 1；
S4, spherical raw material are fired into haydite
Burning equipment use plug-in type rotary kiln, 400 DEG C of preheating temperature, preheating time 10min, 1150 DEG C of maturing temperature,
Calcining time 10min obtains target product sludge silt soil matrix haydite.
The performance of the controllable sludge silt soil matrix haydite of hole of embodiment 1-3 preparation is shown in Table 1.As can be seen that prepare
Porosity number of structures is more, and pore-size is uniform, and quality is light.
The performance of the controllable sludge silt soil matrix haydite of hole prepared by table 1, embodiment 1-3
Embodiment 4
A kind of even porous sludge silt soil matrix haydite, weight percentage, raw material include: sludge 48%, dregs
33%, shale 10%, rice husk 2%, hole adjusting control agent 6%, iron oxide 1%.Wherein hole adjusting control agent forms are as follows: 14 parts by weight ten
Phosphate dihydrate trisodium, 2 parts by weight of phosphoric acid potassium dihydrogens.
Haydite preparation method is the same as embodiment 3.
Embodiment 5
A kind of even porous sludge silt soil matrix haydite, weight percentage, raw material include: sludge 48%, dregs
33%, shale 10%, rice husk 2%, hole adjusting control agent 6%, iron oxide 1%.Wherein hole adjusting control agent forms are as follows: 14 parts by weight ten
Phosphate dihydrate trisodium, 2 part by weight of boric acid.
Haydite preparation method is the same as embodiment 3.
Embodiment 6
A kind of even porous sludge silt soil matrix haydite, weight percentage, raw material include: sludge 48%, dregs
33%, shale 10%, rice husk 2%, hole adjusting control agent 6%, iron oxide 1%.Wherein hole adjusting control agent forms are as follows: 10 parts by weight ten
Phosphate dihydrate trisodium, 4 part by weight of boric acid.
Haydite preparation method is the same as embodiment 3.
The performance of the controllable sludge silt soil matrix haydite of hole of embodiment 3-6 preparation is shown in Table 2.As can be seen that raw sludge,
Dregs, shale, rice husk, hole adjusting control agent and iron oxide usage ratio it is identical when, change the component of hole adjusting control agent and contain
Amount, haydite pore size distribution obtained are different.Therefore, it can according to need in actual production, by controlling hole
The component and content of adjusting control agent are distributed different haydites to prepare gap.
The performance comparison data of the controllable sludge silt soil matrix haydite of hole prepared by table 2, embodiment 3-6
In conclusion bleed component abundant, the higher sial of architecture sediment inside present invention combination city sewage and sludge
Matter content, the excellent foam stability energy of steady hole agent, fluxing agent form good liquid phase viscosity for solution and provide the characteristics such as advantage,
It can be effectively improved and be optimized the internal voids structure of haydite, reduce firing energy consumption, while the intensity of haydite can also be effectively ensured
Performance.By adjusting different former material compositions and sintering schedule, to meet requirement of the different industries to haydite performance, there is market
Application prospect.The high heating value inside sewage sludge is made full use of, provides a large amount of energy source, while benefit for the firing of haydite
Drying pretreatment is carried out to former material with the sintering waste heat of rotary kiln, optimizes energy flow, substantially reduces energy consumption.It is pretreated
Haydite raw material can be effectively reduced its preheating, the cracking risk in sintering process, effectively improve product quality.It is ceramisite sintered
In the process, can be by burnings such as pathogen, pernicious gas that city sewage and sludge carries totally, a while remaining huge sum of money after being sintered
Category can be effectively secured in the network structure of alumino-silicate, be a kind of effective way of harmlessness disposing city solid waste.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With.It can be applied to various suitable the field of the invention completely.It for those skilled in the art, can be easily
Realize other modification.Therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details.
Claims (10)
1. a kind of controllable sludge silt soil matrix haydite of hole, which is characterized in that be made of the raw material of following weight percent:
Sludge 45~55%, dregs 30~40%, shale 5~10%, rice husk 2%, hole adjusting control agent 4~6%, fluxing agent 0.2
~2%；The hole adjusting control agent is compounded by ten phosphate dihydrate salt, potassium dihydrogen phosphate, boric acid therein at least two.
2. the controllable sludge silt soil matrix haydite of hole as described in claim 1, which is characterized in that the sludge is moisture content 45
~55% urban domestic sewage sludge.
3. the controllable sludge silt soil matrix haydite of hole as described in claim 1, which is characterized in that the dregs is from building work
Excavate the discarded clay of foundation pit, moisture content≤20% in ground.
4. the controllable sludge silt soil matrix haydite of hole as described in claim 1, which is characterized in that the shale is from building work
The discarded shale of digging, moisture content≤20% when ground smooth location.
5. the controllable sludge silt soil matrix haydite of hole as described in claim 1, which is characterized in that the hole adjusting control agent is by 8
Ten phosphate dihydrate salt of~14 parts by weight compounded with the potassium dihydrogen phosphate of 1~4 parts by weight or 8~14 parts by weight ten
Phosphate dihydrate salt is compounded with the boric acid of 1~4 parts by weight or ten phosphate dihydrate salt of 8~14 parts by weight, 1~4 parts by weight
Potassium dihydrogen phosphate and the boric acid threes of 1~4 parts by weight compound, the component and content difference of hole adjusting control agent obtain sky
The different haydite of gap.
6. the controllable sludge silt soil matrix haydite of hole as claimed in claim 5, which is characterized in that the fluxing agent is oxidation
Iron.
7. a kind of preparation method of the controllable sludge silt soil matrix haydite of hole as claimed in any one of claims 1 to 6, feature
It is, includes the following steps:
S1, by sludge dewatering to moisture content 45~55%；Dregs and shale carry out drying break process respectively；
S2, dregs, shale, rice husk, hole adjusting control agent and fluxing agent are uniformly mixed, are then uniformly mixed, obtain with sludge again
The mixture of moisture content 20~25%；
S3, the spherical raw material that the mixture of step S2 is made to 5~20mm of diameter are placed at shady and cool ventilation after balling-up and are aged
24h；
S4, the spherical raw material after ageing are placed in rotary kiln, 8~12min are first preheated under the conditions of 350~450 DEG C of temperature, so
After be warming up to 1100~1150 DEG C of 8~12min of roasting.
8. the preparation method of the controllable sludge silt soil matrix haydite of hole as claimed in claim 7, which is characterized in that the step S1
In, original state sludge is dried to moisture content 45%~55%, dregs and shale at 105 DEG C, and to be crushed to partial size small after 105 DEG C of drying
In equal to 0.3mm.
9. the preparation method of the controllable sludge silt soil matrix haydite of hole as claimed in claim 8, which is characterized in that the hole tune
It is therein by ten phosphate dihydrate salt of 8~14 parts by weight, the potassium dihydrogen phosphate of 1~4 parts by weight, the boric acid of 1~4 parts by weight to control agent
At least two compound, and adjust the gap of control haydite by changing component and the content of hole adjusting control agent.
10. the preparation method of the controllable sludge silt soil matrix haydite of hole as claimed in claim 8, which is characterized in that the step
S4 are as follows: spherical raw material are placed in industrial rotary kiln, preheat 10min at 400 DEG C, roast 10min at 1150 DEG C.
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Cited By (5)
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| CN110963783A (en) * | 2019-12-26 | 2020-04-07 | 中建西部建设股份有限公司 | Sludge-based high-strength ceramsite and preparation method thereof |
| CN111116210A (en) * | 2019-12-30 | 2020-05-08 | 同济大学 | Method for preparing light ceramsite by utilizing biological coal ecological sintering waste soil |
| CN111704436A (en) * | 2020-06-30 | 2020-09-25 | 武汉明源碧景环保科技股份有限公司 | Device and method for preparing ceramsite by cooperation of coal gangue, phosphogypsum and sludge |
| CN112679222A (en) * | 2020-12-09 | 2021-04-20 | 辽宁省环保集团有限责任公司 | Resource disposal method for sludge drying incineration granulation |
| CN116375451A (en) * | 2023-02-03 | 2023-07-04 | 淮南东辰固废利用有限公司 | Raw material processing technology for producing ceramsite from coal gangue |
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| CN111704436A (en) * | 2020-06-30 | 2020-09-25 | 武汉明源碧景环保科技股份有限公司 | Device and method for preparing ceramsite by cooperation of coal gangue, phosphogypsum and sludge |
| CN111704436B (en) * | 2020-06-30 | 2021-03-09 | 武汉明源碧景环保科技有限公司 | Device and method for preparing ceramsite by cooperation of coal gangue, phosphogypsum and sludge |
| CN112679222A (en) * | 2020-12-09 | 2021-04-20 | 辽宁省环保集团有限责任公司 | Resource disposal method for sludge drying incineration granulation |
| CN116375451A (en) * | 2023-02-03 | 2023-07-04 | 淮南东辰固废利用有限公司 | Raw material processing technology for producing ceramsite from coal gangue |
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| CN109851265B (en) | 2021-08-17 |
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