CN116329254A - Synergistic treatment process for fly ash and carbonized slag - Google Patents

Synergistic treatment process for fly ash and carbonized slag Download PDF

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Publication number
CN116329254A
CN116329254A CN202310304159.1A CN202310304159A CN116329254A CN 116329254 A CN116329254 A CN 116329254A CN 202310304159 A CN202310304159 A CN 202310304159A CN 116329254 A CN116329254 A CN 116329254A
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fly ash
water
carbonized
treatment
heating
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CN116329254B (en
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耿海榕
黄伟强
郭鹏飞
董方敏
张俊耀
康广一
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Zhejiang Huiheyuan Environmental Technology Co ltd
Zhejiang Hehui Ecological Environment Technology Co ltd
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Zhejiang Huiheyuan Environmental Technology Co ltd
Zhejiang Hehui Ecological Environment Technology Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/38Stirring or kneading
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/35Shredding, crushing or cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B2101/00Type of solid waste
    • B09B2101/30Incineration ashes
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The application discloses a fly ash and carbide slag cooperative treatment process, which comprises the following steps: s1, uniformly mixing fly ash, carbide slag, water and ingredients to prepare fly ash slurry; s2, heating the fly ash slurry at 102-106 ℃ for 50-60 minutes to obtain an intermediate; s3, crushing the intermediate to obtain particles; and S4, carrying out melting treatment on the particles to obtain the glass body. The method adopts the mode of mixing the solution, so that the raw materials such as the fly ash and the like are fully mixed, the components in the glass body are uniformly distributed, and the water evaporation and the water-soluble chlorine escape are realized by adopting the mode of heating treatment, so that the production of industrial wastewater is reduced.

Description

Synergistic treatment process for fly ash and carbonized slag
Technical Field
The application relates to the technical field of fly ash treatment, in particular to a process for cooperatively treating fly ash and carbonized residues.
Background
The fly ash is a substance collected by a flue gas dust removal system after the garbage incineration, contains a large amount of soluble heavy metals, dioxins and the like, belongs to hazardous waste, and is mainly treated by high-temperature stabilization treatment at present, and the method for treating the fly ash at high temperature comprises the following steps: the fly ash after water washing is mixed with additives such as glass powder and the like to obtain a fly ash mixture, then the fly ash mixture is put into an equal melting system, the fly ash mixture is melted, organic pollutants such as dioxin and the like in the fly ash are decomposed at high temperature, and slag is rapidly cooled to form compact and stable glass body, so that leaching of heavy metals is effectively controlled.
The existing fly ash treated at high temperature has the following defects: 1. after the fly ash is subjected to multi-stage water washing, a large amount of industrial wastewater is generated, and the industrial wastewater can be discharged after being treated; 2. the fly ash after washing is mixed with the additive in a solid state, and the mixing is uneven, so that the amount of toxic extract in part of the vitreous body is out of specification, and the amount of toxic extract in part of the vitreous body is far below specification.
Disclosure of Invention
In order to solve at least one of the technical problems, a fly ash treatment process is developed, wherein raw materials are uniformly mixed and less industrial wastewater is generated, and the fly ash and carbonized residues are cooperatively treated.
The application provides a process for cooperatively treating fly ash and carbonized residues, which comprises the following steps:
s1, uniformly mixing fly ash, carbide slag, water and ingredients to prepare fly ash slurry;
s2, heating the fly ash slurry at 102-106 ℃ for 50-60 minutes to obtain an intermediate;
s3, crushing the intermediate to obtain particles;
and S4, carrying out melting treatment on the particles to obtain the glass body.
Through adopting above-mentioned technical scheme, the present solid state mode of mixing has been abandoned to this application, but adopts the mode of solution mixing, can make raw materials such as flying ash more fully mix to the toxic leaches in the messenger vitreous body distributes more evenly, and adopts the mode of heating treatment to make water evaporation and water-soluble chlorine escape, has reduced industrial waste water's production.
Optionally, the ingredients comprise rice hull powder.
By adopting the technical scheme, the rice hull powder is rich in lignin and silicon dioxide, and a large number of hydrophilic groups such as phenolic hydroxyl groups, alcoholic hydroxyl groups and the like exist in the lignin molecular structure, so that the hydrophilicity is increased, and the flow property of the raw materials during mixing can be regulated; silicon is the main element forming the vitreous structure, and silicon dioxide can promote the formation of particulate matter into the vitreous during high temperature melt processing.
Optionally, in the step S1, 45-52 parts of fly ash, 9-12 parts of carbide slag, 12-16 parts of water and 2.2-2.8 parts of ingredients are calculated according to parts by weight.
Optionally, in step S1, the fly ash, the carbonized residues, the water and the ingredients are uniformly mixed by a stirring device, the rotation speed during stirring is 70-85 revolutions per minute, and the stirring time is 25-30 minutes.
Optionally, in step S1, the carbon element in the carbide slag is 35% by mass, the silicon is 22% by mass, and the iron is 18% by mass.
By adopting the technical scheme, the carbonized slag is a residue of organic solid waste after pyrolysis treatment, is also a hazardous waste, is rich in carbon elements, can provide heat when heating the fly ash slurry, so that water and soluble chlorine in the fly ash slurry evaporate faster, can provide heat when melting treatment, thereby reducing the consumption of fuel of a melting furnace, is also rich in silicon, iron and the like, and can be well combined with calcium in the fly ash when melting treatment at high temperature to form vitrified products.
Optionally, the gas discharged during the heating treatment in the step S2 flows into the water tank, and the water flowing out of the water tank can be used as the source of water in the step S1 after chlorine removal.
By adopting the technical scheme, the water in the fly ash slurry is evaporated and the water-soluble chlorine escapes through the heating treatment, the water can absorb the soluble chlorine by contacting with the water, and the evaporated water vapor is condensed into water to be recycled.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the application abandons the existing solid mixing mode, but adopts a solution mixing mode, so that raw materials such as fly ash and the like are fully mixed, so that components in a glass body are distributed uniformly, water evaporation and water-soluble chlorine escape are realized by adopting a heating treatment mode, and the generation of industrial wastewater is reduced.
2. The water in the fly ash slurry is evaporated and the water-soluble chlorine escapes through the heating treatment, the escaping gas flows into the water tank and contacts with the water in the water tank, the water can absorb the soluble chlorine, and the evaporated water vapor is condensed into water for recycling.
Drawings
Fig. 1 is a schematic structural diagram of a hybrid heating device provided in the present application;
FIG. 2 is a process flow diagram of the co-treatment of fly ash and carbonized slag provided herein;
reference numerals illustrate: 1. a tank body; 2. an isolation bucket; 21. a feed opening; 22. an electric control valve I; 3. a mixing chamber; 31. a feed inlet; 32. a water inlet; 33. a stirring device; 4. a heating chamber; 41. an exhaust port; 42. an electric heating tube; 43. a door panel; 5. a water tank; 51. an air inlet pipe; 52. a water outlet; 53. a water outlet pipe; 54. a chlorine removal cartridge; 55. a flow meter; 56. and (3) a water pump.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples.
The application designs a process for cooperatively treating fly ash and carbonized residues, which comprises the following steps:
s1, uniformly mixing fly ash, carbide slag, water and ingredients to prepare fly ash slurry;
s2, heating the fly ash slurry at 102-106 ℃ for 50-60 minutes to obtain an intermediate;
s3, crushing the intermediate to obtain particles;
and S4, carrying out melting treatment on the particles to obtain the glass body.
The method adopts the mode of mixing the solution, so that the raw materials such as the fly ash and the like are fully mixed, the components in the glass body are uniformly distributed, and the water evaporation and the water-soluble chlorine escape are realized by adopting the mode of heating treatment, so that the production of industrial wastewater is reduced. The carbonized slag is a residue obtained after pyrolysis treatment of organic solid waste, is also a hazardous waste, is rich in carbon elements, can provide heat for heating the fly ash slurry, so that water and soluble chlorine in the fly ash slurry are quickly evaporated, and can provide heat for melting treatment, thereby reducing the consumption of fuel of a melting furnace.
In the above technical solution, optionally, the gas discharged during the heating treatment in step S2 flows into the water tank, and the water flowing out of the water tank can be used as the source of water in step S1 after chlorine is removed.
The water in the fly ash slurry is evaporated and the water-soluble chlorine escapes through the heating treatment, the escaping gas flows into the water tank and contacts with the water in the water tank, the water can absorb the soluble chlorine, and the evaporated water vapor can be recycled.
As shown in fig. 1, the present application provides a mixed heating device for collaborative treatment of fly ash and carbonized residues, comprising: tank 1, isolation bucket 2, water tank 5.
The separation hopper 2 is arranged in the tank body 1, the separation hopper 2 divides the inner cavity of the tank body 1 into a mixing chamber 3 and a heating chamber 4, the mixing chamber 3 is positioned above the heating chamber 4, the bottom of the separation hopper 2 is provided with a blanking opening 21, the mixing chamber 3 is communicated with the heating chamber 4 through the blanking opening 21, and the blanking opening 21 is provided with an electric control valve I22; the top of the mixing chamber 3 is provided with a feed inlet 31 and a water inlet 32, and a stirring device 33 is arranged in the mixing chamber 3; an electric heating tube 42 is arranged in the heating chamber 4, the electric heating tube 42 is a Teflon electric heating tube, a temperature sensor is arranged in the heating chamber 4 so as to monitor the heating temperature in the heating chamber 4, an exhaust port 41 is arranged on the side wall of the upper part of the heating chamber 4, and a door plate 43 is arranged on the side wall of the lower part of the heating chamber 4.
Tap water is stored in the water tank 5, an air inlet pipe 51 is arranged on the side wall of the lower portion of the water tank 5, the air inlet pipe 51 is arranged in an upward inclined mode, the air inlet pipe 51 is located below the air outlet 41, the air outlet 41 is connected with the air inlet pipe 51 through a downward inclined pipeline, the air inlet end of the air inlet pipe 51 is located above the water surface in the water tank 5, the air outlet end of the air inlet pipe 51 is located below the water surface in the water tank 5, a water outlet 52 is arranged at the bottom of the water tank 5, an electric control valve II is arranged on the water outlet 52, a water outlet pipe 53 is arranged at the water outlet end of the water outlet 52, a chlorine removal filter element 54, a flowmeter 55 and a water pump 56 are arranged on the water outlet 53, the chlorine removal filter element 54 is located between the water pump 56 and the water outlet 52 and used for intercepting chlorine in water, the flowmeter 55 is located between the water pump 56 and the water inlet 32, and the water outlet end of the water outlet pipe 53 is connected with the water inlet 32.
On the other hand, the application also provides a method for carrying out cooperative treatment on fly ash and carbonized residues by adopting the mixed heating device, which comprises the following steps:
s1, uniformly mixing the raw materials in the following table 1 in a mixing chamber 3 to prepare fly ash slurry
TABLE 1
Fly ash Carbide slag Water and its preparation method Rice hull powder
Example 1 50kg 10kg 15L 2.5kg
Example 2 45kg 9kg 12L 2.2kg
Example 3 52kg 12kg 16L 2.8kg
Example 4 48kg 10.5kg 14.5L 2.6kg
The carbide slag is a residue obtained after pyrolysis treatment of organic solid waste, wherein the mass percentage of carbon elements is 35%, the mass percentage of silicon is 22%, the mass percentage of iron is 18%, and the average grain diameter of the carbide slag is 8mm; the rice hull powder is dust-removing rice hull powder (screen bran) 2 of Beijing Hua Jie Ji Tai commercial Co.
Fly ash, carbide slag and rice hull powder enter the mixing chamber 3 from the feed inlet 31; the water is sourced from the water stored in the water tank 5, the chlorine removal cartridge can retain chlorine in the water, when the flowmeter 55 detects that the amount of water flowing into the mixing chamber 3 reaches the proportioning amount, the water pump 56 stops working, the second electric control valve is in a closed state, and then the stirring device 33 operates under the conditions shown in the following table 2, so that the fly ash, the carbide slag, the rice hull powder and the water are uniformly mixed, and the fly ash slurry is prepared.
TABLE 2
Rotating speed (rpm) Duration of rotation (minutes)
Example 1 70 30
Example 2 80 26
Example 3 75 28
Example 4 85 25
S2, heating the fly ash slurry prepared in the step S1 to prepare an intermediate
When the fly ash, the carbonized slag, the rice hull powder and the water are uniformly mixed, the stirring device 33 stops running, the first electric control valve 22 is in an open state, the fly ash slurry in the mixing chamber 3 falls into the heating chamber 4 through the discharging opening 21, then the first electric control valve 22 is in a closed state, the electric heating tube 42 is electrified to generate heat, so that the temperature in the mixing chamber 3 reaches the temperature shown in the table 3, and the obtained temperature is kept for a period of time shown in the table 3, so that the fly ash slurry is heated, the moisture in the fly ash slurry evaporates and the soluble chlorine escapes, an intermediate is obtained, the gas escaping from the fly ash slurry enters the water tank 5 through the air outlet 41 and the air inlet tube 51 and contacts with the water, the water can absorb the soluble chlorine, and the evaporated water vapor is condensed into water to be recycled.
TABLE 3 Table 3
Temperature (. Degree. C.) The duration (minutes) of the temperature hold
Example 1 105 60
Example 2 102 65
Example 3 106 50
Example 4 104 55
S3, crushing the intermediate prepared in the step S2 to prepare particles
The door panel 43 was opened, and the intermediate in the heating chamber 4 was taken out and subjected to pulverization treatment to obtain particles, the average particle diameters of which are shown in table 4.
TABLE 4 Table 4
Average particle diameter (mm)
Example 1 6
Example 2 8
Example 3 5
Example 4 10
And S4, melting and water quenching the particles obtained in the step S3 to obtain a glass body, wherein the melting temperature is shown in table 5.
TABLE 5
Melting temperature (. Degree. C.)
Example 1 1350
Example 2 1400
Example 3 1300
Example 4 1250
Experimental detection
The glass bodies obtained in examples 1 to 4 were subjected to acid leaching toxicity test according to GB5085.3-2007 hazardous waste identification Standard leaching toxicity test, and the test results are shown in Table 6 below.
TABLE 6
Figure BDA0004146121070000051
Figure BDA0004146121070000061
As is clear from the results of the examination in Table 6, the amount of toxic extract in the glass body obtained in the present application was lower than the standard value.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (6)

1. The process for cooperatively treating the fly ash and the carbonized slag is characterized by comprising the following steps of:
s1, uniformly mixing fly ash, carbide slag, water and ingredients to prepare fly ash slurry;
s2, heating the fly ash slurry at 102-106 ℃ for 50-60 minutes to obtain an intermediate;
s3, crushing the intermediate to obtain particles;
and S4, carrying out melting treatment on the particles to obtain the glass body.
2. The process according to claim 1, wherein in step S1, the ingredients comprise rice hull powder.
3. The process for the synergistic treatment of fly ash and carbonized residues according to claim 1, wherein in the step S1, 45-52 parts of fly ash, 9-12 parts of carbonized residues, 12-16 parts of water and 2.2-2.8 parts of ingredients are calculated according to parts by weight.
4. The process for the collaborative treatment of fly ash and carbonized residues according to claim 1, wherein in the step S1, the fly ash, carbonized residues, water and ingredients are uniformly mixed by a stirring device, the stirring speed is 70-85 rpm, and the stirring time is 25-30 minutes.
5. The process for the synergistic treatment of fly ash and carbonized slag according to claim 1, wherein in step S1, the mass percentage of carbon element in the carbonized slag is 35%, the mass percentage of silicon is 22% and the mass percentage of iron is 18%.
6. The process according to claim 1, wherein the gas discharged during the heating treatment in step S2 flows into the water tank, and the water flowing out of the water tank is used as a source of water in step S1 after chlorine removal.
CN202310304159.1A 2023-03-27 2023-03-27 Synergistic treatment process for fly ash and carbonized slag Active CN116329254B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09314088A (en) * 1996-05-28 1997-12-09 Mitsubishi Heavy Ind Ltd Treatment of fly ash
CN106903130A (en) * 2017-03-03 2017-06-30 东南大学 A kind of method of the middle firm incineration of refuse flyash heavy metal of warm treatment
CN108545933A (en) * 2018-05-04 2018-09-18 环境保护部南京环境科学研究所 A kind of method that dangerous waste incineration lime-ash prepares vitreum
CN109746253A (en) * 2019-03-18 2019-05-14 中冶南方都市环保工程技术股份有限公司 The method and device of metallurgical slag collaboration processing incineration of refuse flyash
CN112906218A (en) * 2021-02-07 2021-06-04 浙江和惠生态环境科技有限公司 Compatibility method, control system, equipment and storage medium for high-temperature melting treatment of fly ash
CN113926829A (en) * 2020-07-10 2022-01-14 清华大学 Carbon-containing fly ash high-temperature melting treatment system
CN114383142A (en) * 2021-12-24 2022-04-22 南京万德斯环保科技股份有限公司 Fusion method and system based on co-treatment of fly ash and leachate of waste incineration plant
CN115385577A (en) * 2022-10-11 2022-11-25 张锦彬 Fly ash thermal insulation cotton and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09314088A (en) * 1996-05-28 1997-12-09 Mitsubishi Heavy Ind Ltd Treatment of fly ash
CN106903130A (en) * 2017-03-03 2017-06-30 东南大学 A kind of method of the middle firm incineration of refuse flyash heavy metal of warm treatment
CN108545933A (en) * 2018-05-04 2018-09-18 环境保护部南京环境科学研究所 A kind of method that dangerous waste incineration lime-ash prepares vitreum
CN109746253A (en) * 2019-03-18 2019-05-14 中冶南方都市环保工程技术股份有限公司 The method and device of metallurgical slag collaboration processing incineration of refuse flyash
CN113926829A (en) * 2020-07-10 2022-01-14 清华大学 Carbon-containing fly ash high-temperature melting treatment system
CN112906218A (en) * 2021-02-07 2021-06-04 浙江和惠生态环境科技有限公司 Compatibility method, control system, equipment and storage medium for high-temperature melting treatment of fly ash
CN114383142A (en) * 2021-12-24 2022-04-22 南京万德斯环保科技股份有限公司 Fusion method and system based on co-treatment of fly ash and leachate of waste incineration plant
CN115385577A (en) * 2022-10-11 2022-11-25 张锦彬 Fly ash thermal insulation cotton and preparation method thereof

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