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Ceramsite preparation method using waste incineration fly ash and ceramsite prepared by method

A technology for waste incineration fly ash and ceramsite, which is applied in the field of waste incineration fly ash resource utilization, can solve the problems of low dosage of waste incineration fly ash, poor pressure strength of ceramsite cylinder and high melting temperature, and achieves high efficiency and large scale. Disposal and utilization, excellent performance, the effect of reducing bulk density

Pending Publication Date: 2021-08-06
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain ceramsite whose properties basically meet the requirements, there are problems such as low dosage of waste incineration fly ash (suitable dosage is less than 60%), high melting temperature (~1400°C), long melting time (~50min ), poor compressive strength of ceramsite cylinder, etc.

Method used

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  • Ceramsite preparation method using waste incineration fly ash and ceramsite prepared by method
  • Ceramsite preparation method using waste incineration fly ash and ceramsite prepared by method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use waste incineration fly ash as raw material, add limestone, fly ash, and clay, and control the mass ratio of the main components of the system. After mixing with water evenly, pelletize through a pelletizer to obtain ceramsite green pellets, and dry the pellets in an oven. , Muffle furnace roasting, you can prepare ceramsite.

[0022] In this embodiment, the main component mass ratio is: CaO / SiO 2 =0.3, (SiO 2 +Al 2 o 3 ) / (CaO+Fe 2 o 3 +MgO)=6.

[0023] In this embodiment, the particle size of the green pellets is 10mm.

[0024] In this embodiment, the water content of the raw balls is 20%.

[0025] In this embodiment, the firing temperature is 1050°C.

[0026] In this embodiment, the firing time is 15 minutes.

[0027] The ceramsite bulk density that present embodiment 1 obtains is 530kg / m 3 , the cylinder compressive strength is 8MPa, and the 1h water absorption rate is 5%. The dioxin content, leachable heavy metal content, soluble chlorine content, sulfi...

Embodiment 2

[0029] Use waste incineration fly ash as raw material, add limestone, clay, and sludge, and control the mass ratio of the main components of the system. After mixing evenly with water, pelletize through a pelletizer to obtain green pellets of ceramsite. The pellets are dried in an oven, The ceramsite can be prepared by roasting in a muffle furnace.

[0030] In this embodiment, the main component mass ratio is: CaO / SiO 2 =0.25, (SiO 2 +Al 2 o 3 ) / (CaO+Fe 2 o 3 +MgO)=7.

[0031] In this embodiment, the particle size of the green pellets is 10mm.

[0032] In this embodiment, the water content of the raw balls is 20%.

[0033] In this embodiment, the firing temperature is 900°C.

[0034] In this embodiment, the firing time is 10 minutes.

[0035] The ceramsite bulk density that present embodiment 2 obtains is 510kg / m 3 , the cylinder compressive strength is 5MPa, and the 1h water absorption rate is 6%. The dioxin content, leachable heavy metal content, soluble chlorine c...

Embodiment 3

[0037] Use waste incineration fly ash as raw material, add limestone, fly ash, clay, sludge, and control the mass ratio of the main components of the system, mix with water evenly, and pelletize through a pelletizer to obtain ceramsite raw pellets, raw pellets After drying in an oven and firing in a muffle furnace, ceramsite can be prepared.

[0038] In this embodiment, the main component mass ratio is: CaO / SiO 2 =0.2, (SiO 2 +Al 2 o 3 ) / (CaO+Fe 2 o 3 +MgO)=8.

[0039] In this embodiment, the particle size of the green pellets is 20mm.

[0040] In this embodiment, the water content of the raw balls is 9%.

[0041] In this embodiment, the firing temperature is 800°C.

[0042] In this embodiment, the firing time is 5 minutes.

[0043] The ceramsite bulk density that present embodiment 3 obtains is 500kg / m 3 , the cylinder compressive strength is 7MPa, and the 1h water absorption rate is 9.5%. The dioxin content, leaching heavy metal content, soluble chlorine content, sul...

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Abstract

The invention discloses a preparation method of ceramsite by utilizing waste incineration fly ash and the ceramsite prepared by the preparation method. According to the invention, the waste incineration fly ash is used as a raw material, limestone and a high-silicon substance are added, and the generation amount of a liquid phase in a roasting process is controlled by regulating and controlling the mass ratio of the main components as follows: CaO / SiO2=0.2-0.35, and (SiO2+Al2O3) / (CaO+Fe2O3+MgO)=5-8. Therefore, the cylinder compressive strength of the ceramsite is improved, and the roasting temperature is reduced. The waste incineration fly ash, the limestone, the high-silicon substance and water are uniformly mixed according to the mass ratio, pelletizing is conducted, drying is conducted, and roasting is conducted at the temperature of 800-1200 DEG C for 5-30 minutes to obtain the ceramsite with excellent performance. The method has the advantages of being simple in process, low in production cost, high in resource utilization rate, environmentally friendly and the like, thorough detoxification and efficient resource utilization of the waste incineration fly ash can be synchronously achieved, raw materials can be provided for the ceramsite industry, and dependence on natural raw materials is reduced.

Description

technical field [0001] The invention relates to a method for resource utilization of waste incineration fly ash, in particular to a method for utilizing waste incineration fly ash to prepare ceramsite to realize thorough detoxification and resource utilization of fly ash, and belongs to the technical field of metallurgy and environmental protection. Background technique [0002] With the rapid development of my country's economy and society, the process of urbanization is accelerating, and the amount of garbage generated is also increasing year by year. According to the statistics of the National Bureau of Statistics, in 2019, the volume of domestic garbage removal in my country reached 242 million tons, of which the amount of incineration and harmless treatment was 1.22. million tons. Domestic waste incineration is becoming more and more popular because of its advantages of volume reduction, energy recovery, high temperature of incineration can kill bacteria and viruses, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/135C04B33/13C04B33/132
CPCC04B33/1355C04B33/131C04B33/1352C04B33/1321C04B33/1328C04B2235/442C04B2235/96C04B2235/77Y02P40/60
Inventor 古佛全龙於洋沈东升濮锴
Owner ZHEJIANG GONGSHANG UNIVERSITY
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