CN104998896A - Method for restoring organic contaminated soil by using ceramsite preparation process - Google Patents
Method for restoring organic contaminated soil by using ceramsite preparation process Download PDFInfo
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- CN104998896A CN104998896A CN201510419907.6A CN201510419907A CN104998896A CN 104998896 A CN104998896 A CN 104998896A CN 201510419907 A CN201510419907 A CN 201510419907A CN 104998896 A CN104998896 A CN 104998896A
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Abstract
The invention relates to a harmless and resource technology for preparing a lightweight aggregate ceramsite by curing sintering of organic contaminated soil, at the same time, belongs to the field of contaminated soil restoration, and particularly provides a method for restoring the organic contaminated soil by using a ceramsite preparation process. The method includes the following steps: a, drying the organic contaminated soil in a 90-110 DEG C drying oven; b, crushing and grinding finely the organic contaminated soil of the step (a) with a ball mill, passing through a 100 mesh sieve, and sieving; c, stirring and mixing evenly the organic contaminated soil powder sieved in the step (b) with fly ash by a measuring and feeding system, conveying to a stirring nucleation system, adding water, mixing and nucleating, then producing molded blanks in a double-disc granulator machine, and conveying the blanks to a secondary drying room; d, preheating and sintering in an ignition sintering system; e, taking natural gas and coal gas in the step (d) as fuels, taking hot air as a co-fuel, mixing, and allowing the mixed gas to enter an ignition furnace spray nozzle in the ignition sintering system; and f, naturally cooling to room temperature in a finished product sieving system to obtain the ceramsite product.
Description
Technical field
The present invention relates to and utilize Polluted Soil to solidify innoxious, the resource technology that sinter and produce lightweight aggregate haydite, belong to contaminated soil remediation field, especially a kind of method preparing haydite technique renovation of organic pollution soil simultaneously.
Background technology
At present, half volatile high toxicity organic contamination (polycyclic aromatic hydrocarbon, organo-chlorine pesticide etc.) soil remediation mainly contains following method: chemical oxidation techniques, thermal desorption technology, soil elution technology, cement kiln synergic processing technology, phytoremediation technology, bioremediation technology, air lift technology etc.Except thermal desorption and cement kiln synergic processing technology, remaining recovery technique process half volatile high toxicity organic contamination limited efficiency, the more difficult reparation desired value reaching low concentration.
Relevant device as thermal desorption is expensive, desorption time is long, processing cost is crossed the problems such as height and solved not yet very well; Cement kiln synergic processing technology is applicable to process all organic polluted soils, but this technology utilization Polluted Soil produces the feature of clinker, make the treating capacity of Polluted Soil smaller (as the cement producing lines of 4000 tons only can process 200 tons of dirty soil/skies), affect process progress and increase prevention of secondary pollution difficulty.
Summary of the invention
The object of this invention is to provide a kind of method preparing haydite technique renovation of organic pollution soil, to realize innoxious, minimizing, the resource of organic contamination soil.
This technique comprises aggregate-storing system, dosing system, water system, stir nucleating systems, balling-up, cloth system, igniting sintering system, negative pressure, dust pelletizing system, finished product screen subsystem, wherein aggregate-storing system is connected by helix transporting device with dosing system, dosing system is connected with helix transporting device by bucket elevator with stirring nucleating systems, water system is connected by pipeline with stirring nucleating systems, stir nucleating systems and balling-up, cloth system is connected by port, igniting sintering system is connected by the continuous pallettype sintering machine in igniting sintering system with finished product screen subsystem, negative pressure, dust pelletizing system and igniting sintering system, finished product screen subsystem all adopts pipeline to connect.
Wherein aggregate-storing system is positioned at whole set process foremost, except containing except storage device, is also provided with the devices such as baking oven, ball mill, screening machine in storage device rear end.
Dosing system is positioned at aggregate-storing system rear end, storage device transports material in dosing system by helix transporting device, the spiral reamer scale metering material of system also makes material Homogeneous phase mixing, is provided with data acquisition unit, Real-Time Monitoring material metering feed situation in simultaneity factor.
Stir nucleation system bits in dosing system rear end, being transported to by bucket elevator and helix transporting device after material mixes in dosing system stirs in nucleating systems, material is nucleation under its effect, and water system is added water to it by pipeline simultaneously.
Balling-up, cloth system are positioned at stirs nucleation System Back-end, and material enters balling-up, cloth system by port between the two after nucleation in stirring nucleating systems, in two pan-pelletizer machine, produce shaping blank.Blank is evenly arranged and controls it by the distribution device of system highly sends into igniting sintering system.
Igniting sintering system, mainly containing secondary drying room, ignition furnace, continuous pallettype sintering machine etc., is positioned at balling-up, cloth system rear end.Shaping blank, successively by secondary drying room and continuous pallettype sintering machine, provides thermal source by ignition furnace, and ignition furnace is using natural gas and coal gas as the energy.
Finished product screen subsystem is positioned at igniting sintering system rear end, and the haydite produced is transported in finished product screen subsystem by continuous pallettype sintering machine by igniting sintering system, screens according to particle diameter.
Negative pressure, dust pelletizing system are connected with igniting sintering system, finished product screen subsystem by pipeline, provide the air needed for burning and collect the dusty gas, the dust that produce, and have the function of recovery waste heat by negative pressure.The dusty gas collected and dust process rear discharge up to standard by intrasystem smoke eliminator (sack cleaner and low temperature plasma waste gas treatment equipment).
Storage device, baking oven, ball mill, screening machine, helix transporting device, spiral reamer scale, data acquisition unit, bucket elevator, two pan-pelletizer machine, distribution device, secondary drying room, ignition furnace, continuous pallettype sintering machine, smoke eliminator (sack cleaner and low temperature plasma waste gas treatment equipment) are common apparatus, do not repeat them here.
Concrete technical scheme of the present invention is: the method for haydite technique renovation of organic pollution soil is prepared in a kind of utilization, and the method comprises the following steps:
A, organic contamination soil are dried in the baking oven (in aggregate-storing system) of 90 ~ 110 DEG C;
B, ball mill (in aggregate-storing system), by the organic contamination soil pulverizing and jevigating described in step (a), cross 100 mesh sieves screening (in aggregate-storing system);
Organic contamination soil powder after step (b) is sieved by c, dosing system and flyash are uniformly mixed in proportion, be transported to and stir nucleating systems and to add water mixing nucleation, after produce shaping blank at two pan-pelletizer machine (in balling-up, cloth system), and be transported to secondary drying room (igniting sintering system in);
Pre-thermal sintering in d, igniting sintering system: secondary drying room (in igniting sintering system) is between distributing trough (in balling-up, cloth system) and ignition furnace (lighting a fire in sintering system), utilize the waste heat of bellows to feed back and preheating is carried out to the described shaping blank of step (c), preheating 18-24min in the environment of 450-550 DEG C; Shaping blank after preheating continuous pallettype sintering machine (igniting sintering system in) on, complete sintering work by high temperature dot stove, sintering work condition carries out roasting 26-36min in 1180 ~ 1200 DEG C of environment;
Described in e, step (d) with natural gas, coal gas etc. for fuel, hot-air is combustion-supporting material, be mixed into igniting sintering system in ignition furnace nozzle;
F, in finished product screen subsystem, naturally cool to room temperature, namely obtain ceramic product.
Further, the flue gas that above-mentioned steps (a) (d) produces all is collected by negative pressure, dust pelletizing system and is entered smoke eliminator.
Further, above-mentioned smoke eliminator adopts bag-type dust and low temperature plasma waste gas treatment equipment.
The present invention adopts and prepares haydite PROCESS FOR TREATMENT organic contamination soil, it be simultaneously a kind of with organic contamination soil for primary raw material prepares the method for haydite.Haydite is prepared from by organic contamination soil and flyash two kinds of raw materials, and wherein organic contamination soil's water content is below 20%; First organic contamination soil is carried out dry, broken, sieve, stir, be molded over 1180-1200 DEG C of condition under fire 26-36min and become product.Have the following advantages: (1) system height is energy-conservation, negative pressure, dust pelletizing system and continuous pallettype sintering machine make secondary drying, preheating, sintering, cooling complete on a machine, and while meeting technological requirement, energy obtains efficiency utilization; (2) advanced in performance negative pressure system, exhausting amount meets igniter fuel Thorough combustion, the gas produced when effectively can get rid of burning; (3) use of clean energy resource, the thermal source of system is all from natural gas, coal gas etc., and the discharge of calorific value high pollution thing is few.
The flue gas major pollutants produced in preparation technology are dust and organic pollution gas, the bag-type dust equipment in flue gas purification system and the scrubbing tower in low temperature plasma equipment, can dust effectively in smoke treatment.The feature complicated for organic pollution in flue gas and kind is many, employing lower temperature plasma technology can organic pollution effectively in smoke treatment.This technology distinguishing feature has physical effect, chemical effect concurrently to pollutant, and have the obvious advantages such as energy consumption is low, efficiency is high, non-secondary pollution.
The produced leca of the present invention is kermesinus, and it is high that ceramic quality inside has microcellular structure light weight intensity, meets lightweight aggregate haydite 600 grades of building materials requirements of GB GB/T17431.2-2010 completely.
The present invention is on the defect basis overcoming prior art, and the technical requirement of comprehensive pollution soil process, in conjunction with the pollutant character of organic Polluted Soil, utilizes and prepare haydite technique renovation of organic pollution soil.Because the ultimate size of haydite is between 5mm to 25mm, the flyash of organic Polluted Soil quality more than 10% is wherein mixed using Polluted Soil as primary raw material, oven dry in preparation technology, preheating, the range of reaction temperature of the techniques such as sintering and residence time ranges, 90 ~ 110 DEG C respectively, 450-550 DEG C, 1180 ~ 1200 DEG C and 40-60min, 18-24min, 26-36min, these process characteristics are all conducive to the abundant precipitation of organic pollution in organic contamination soil and decompose and scale process, the organic pollution of separating out is by qualified discharge after efficient flue gas purification system process.Article one, produce Polluted Soil 300,000 side that can dissolve in sintering ceramsite production line year of 300,000 sides per year, average treatment amount is 1200 tons of dirty soil/skies, can 1/15 to 1/50 be reduced to through calculating single ton of processing cost, same cement kiln synergic processing process, the larger cost of this PROCESS FOR TREATMENT amount is lower, achieves the Synchronous lifting of technical benefits and economic benefit.
The soil of organic contamination simultaneously main component is soil, is a kind of outstanding natural resources.Haydite is as a kind of outstanding building material, at the energy and resource growing tension, country prohibits the use clay building materials to advocate today of energy-saving and emission-reduction, organic contamination soil is utilized to replace clay to prepare the main component that haydite make use of organic contamination soil simultaneously, turn waste into wealth, meet innoxious, minimizing and the resource principle of China's municipal solid wastes disposal, will vast potential for future development be had.
Accompanying drawing explanation
Fig. 1 the present invention prepares haydite technique renovation of organic pollution soil process chart.
Detailed description of the invention
If Fig. 1 is that the present invention prepares haydite technique renovation of organic pollution soil process chart.This technique comprises aggregate-storing system 1, dosing system 2, water system 3, stir nucleating systems 4, balling-up, cloth system 5, igniting sintering system 6, negative pressure, dust pelletizing system 7, finished product screen subsystem 8, wherein aggregate-storing system 1 is connected by helix transporting device with dosing system 2, dosing system 2 is connected with helix transporting device by bucket elevator with stirring nucleating systems 4, water system 3 is connected by pipeline with stirring nucleating systems 4, stir nucleating systems 4 and balling-up, cloth system 5 is connected by port, igniting sintering system 6 is connected by the continuous pallettype sintering machine in igniting sintering system 6 with finished product screen subsystem 8, negative pressure, dust pelletizing system 7 and igniting sintering system, finished product screen subsystem 8 all adopts pipeline to connect.
Wherein aggregate-storing system 1 is positioned at whole set process foremost, except containing except storage device, is also provided with the devices such as baking oven, ball mill, screening machine in storage device rear end.
Dosing system 2 is positioned at aggregate-storing system rear end, storage device transports material in dosing system 2 by helix transporting device, the spiral reamer scale metering material of system also makes material Homogeneous phase mixing, data acquisition unit is provided with, Real-Time Monitoring material metering feed situation in simultaneity factor.
Stir nucleating systems 4 and be positioned at dosing system 2 rear end, being transported to by bucket elevator and helix transporting device after material mixes in dosing system 2 stirs in nucleating systems 4, material is nucleation under its effect, and water system 3 is added water to it by pipeline simultaneously.
Balling-up, cloth system 5 system are positioned at stirs nucleating systems 4 rear end, and material enters balling-up, cloth system 5 by port between the two after nucleation in stirring nucleating systems 4, in two pan-pelletizer machine, produce shaping blank.Blank is evenly arranged and controls it by the distribution device of system highly sends into igniting sintering system 6.
Igniting sintering system 6, mainly containing secondary drying room, ignition furnace, continuous pallettype sintering machine etc., is positioned at balling-up, cloth system 5 rear end.Shaping blank, successively by secondary drying room and continuous pallettype sintering machine, provides thermal source by ignition furnace, and ignition furnace is using natural gas and coal gas as the energy.
Finished product screen subsystem 8 is positioned at igniting sintering system 6 rear end, and the haydite produced is transported in finished product screen subsystem 8 by continuous pallettype sintering machine by igniting sintering system 6, screens according to grade.
Negative pressure, dust pelletizing system 7 are connected with igniting sintering system 6, finished product screen subsystem 8 by pipeline, provide the air needed for burning and collect the dusty gas, the dust that produce, and have the function of recovery waste heat by negative pressure.The dusty gas collected and dust process rear discharge up to standard by intrasystem smoke eliminator (sack cleaner and low-temperature plasma waste gas treatment equipment).
Storage device, baking oven, ball mill, screening machine, helix transporting device, spiral reamer scale, data acquisition unit, bucket elevator, two pan-pelletizer machine, distribution device, secondary drying room, ignition furnace, continuous pallettype sintering machine, smoke eliminator (sack cleaner and low-temperature plasma waste gas treatment equipment) are common apparatus, do not repeat them here.
Below in conjunction with embodiment, the method that the present invention prepares haydite technique renovation of organic pollution soil is further described.
Certain place organic contamination soil is repaired to prepare haydite technique.Organic contamination soil is primarily of soil constitution and containing a small amount of organic pollution.Organic contamination soil major pollutants character analysis the results are shown in Table 1.
Table 1 organic contamination soil major pollutants proterties table
(superstate standard all far away)
Case study on implementation: in the present embodiment, flyash addition occupies 12% of machine Polluted Soil quality, sintering temperature 1180 ~ 1200 DEG C.Preparation method's step is as follows:
A, organic contamination soil are dried in the baking oven (in aggregate-storing system) of 90 ~ 110 DEG C;
B, ball mill (in aggregate-storing system 1), by the organic contamination soil pulverizing and jevigating described in step (a), cross 100 mesh sieves screening (in aggregate-storing system 1);
Organic contamination soil powder after step (b) is sieved by c, dosing system 2 and flyash are uniformly mixed in proportion, be transported to and stir nucleating systems 4 and to add water mixing nucleation, after produce shaping blank at two pan-pelletizer machine (in balling-up, cloth system 5), and be transported to secondary drying room (igniting sintering system 6 in);
Pre-thermal sintering in d, igniting sintering system 6: secondary drying room (in igniting sintering system 6) is between distributing trough (in balling-up, cloth system 5) and ignition furnace (lighting a fire in sintering system 6), utilize the waste heat of bellows to feed back and preheating is carried out to the described shaping blank of step (c), preheating 18-24min in the environment of 450-550 DEG C; Shaping blank after preheating continuous pallettype sintering machine (igniting sintering system 6 in) on, complete sintering work by high temperature dot stove, sintering work condition carries out roasting 26-36min in 1180 ~ 1200 DEG C of environment;
Described in e, step (d) with natural gas, coal gas etc. for fuel, hot-air is combustion-supporting material, be mixed into igniting sintering system 6 in ignition furnace nozzle;
F, in finished product screen subsystem 8, naturally cool to room temperature, namely obtain ceramic product.
The flue gas that g, above-mentioned steps (a) (d) produce all is collected by negative pressure, dust pelletizing system 7 and is entered smoke eliminator.
H, smoke eliminator adopt bag-type dust and low-temperature plasma waste gas treatment equipment.
After making haydite, the major pollutants PAH in haydite does not all detect, and in haydite, major pollutants character analysis the results are shown in Table 2.
Major pollutants proterties table in table 2 haydite
(NF employing 0.0 represents)
Adopt the haydite kermesinus obtained by above method, it is high that ceramic quality inside has microcellular structure light weight intensity.More than the regulation of cylindrical compress strength >=4.0Mpa in GB/T17431.2 – 2010, lower than the regulation of water suction≤10%.Haydite character analysis the results are shown in Table 3.
Table 3 haydite character analysis result
Claims (3)
1. a method for haydite technique renovation of organic pollution soil is prepared in utilization, comprises the following steps:
A, organic contamination soil are dried in the baking oven (in aggregate-storing system) of 90 ~ 110 DEG C;
B, ball mill (in aggregate-storing system), by the organic contamination soil pulverizing and jevigating described in step (a), cross 100 mesh sieves screening (in aggregate-storing system);
Organic contamination soil powder after step (b) is sieved by c, dosing system and flyash are uniformly mixed, be transported to and stir nucleating systems and to add water mixing nucleation, after produce shaping blank at two pan-pelletizer machine (in balling-up, cloth system), and be transported to secondary drying room (igniting sintering system in);
Pre-thermal sintering in d, igniting sintering system: secondary drying room (in igniting sintering system) is between distributing trough (in balling-up, cloth system) and ignition furnace (lighting a fire in sintering system), utilize the waste heat of bellows to feed back and preheating is carried out to the described shaping blank of step (c), preheating 18-24min in the environment of 450-550 DEG C; Shaping blank after preheating continuous pallettype sintering machine (igniting sintering system in) on, complete sintering work by high temperature dot stove, sintering work condition carries out roasting 26-36min in 1180 ~ 1200 DEG C of environment;
Described in e, step (d) with natural gas, coal gas etc. for fuel, hot-air is combustion-supporting material, be mixed into igniting sintering system in ignition furnace nozzle;
F, in finished product screen subsystem, naturally cool to room temperature, namely obtain ceramic product.
2. the method for haydite technique renovation of organic pollution soil is prepared in a kind of utilization according to claim 1, it is characterized in that, the flue gas flue gas that described step (a), (d) produce all is collected by negative pressure, dust pelletizing system and entered flue gas purification system.
3. the method for haydite technique renovation of organic pollution soil is prepared in a kind of utilization according to claim 1, it is characterized in that, described flue gas purification system adopts bag-type dust and low-temperature ion body processing method.
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106001080A (en) * | 2016-05-17 | 2016-10-12 | 曹树梁 | Method for separating and porcelainizing soil for treating toxic land parcel |
CN107363087A (en) * | 2017-09-13 | 2017-11-21 | 西南科技大学 | A kind of processing method of Petroleum concentration soil |
CN113249566A (en) * | 2021-03-03 | 2021-08-13 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
CN113732038A (en) * | 2021-09-13 | 2021-12-03 | 中冶节能环保有限责任公司 | Contaminated soil heat treatment system and process |
CN114789191A (en) * | 2022-04-12 | 2022-07-26 | 浙江大学 | System for repairing organic contaminated soil by fluidized discharge plasma |
CN115055506A (en) * | 2022-05-13 | 2022-09-16 | 北京建工环境工程咨询有限责任公司 | Contaminated soil remediation system |
Citations (1)
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CN102173850A (en) * | 2011-01-24 | 2011-09-07 | 天津壹生环保科技有限公司 | Energy-saving consumption-reducing technique for preparing haydite by co-disposing polluted soil and desilting sediment |
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2015
- 2015-07-17 CN CN201510419907.6A patent/CN104998896A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102173850A (en) * | 2011-01-24 | 2011-09-07 | 天津壹生环保科技有限公司 | Energy-saving consumption-reducing technique for preparing haydite by co-disposing polluted soil and desilting sediment |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106001080A (en) * | 2016-05-17 | 2016-10-12 | 曹树梁 | Method for separating and porcelainizing soil for treating toxic land parcel |
CN107363087A (en) * | 2017-09-13 | 2017-11-21 | 西南科技大学 | A kind of processing method of Petroleum concentration soil |
CN113249566A (en) * | 2021-03-03 | 2021-08-13 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
CN113249566B (en) * | 2021-03-03 | 2023-02-07 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
CN113732038A (en) * | 2021-09-13 | 2021-12-03 | 中冶节能环保有限责任公司 | Contaminated soil heat treatment system and process |
CN114789191A (en) * | 2022-04-12 | 2022-07-26 | 浙江大学 | System for repairing organic contaminated soil by fluidized discharge plasma |
CN115055506A (en) * | 2022-05-13 | 2022-09-16 | 北京建工环境工程咨询有限责任公司 | Contaminated soil remediation system |
CN115055506B (en) * | 2022-05-13 | 2024-04-19 | 北京建工环境工程咨询有限责任公司 | Contaminated soil restoration system |
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