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A method and device for preparing ceramsite by pyrolyzing biochar from sludge

A biochar and pyrolysis technology, applied in the production of ceramic products, clay products, ceramic materials, etc., can solve the problem of low degree of comprehensive utilization on a large scale, and achieve the effect of large-scale utilization and high-efficiency solidification.

Active Publication Date: 2019-03-05
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention overcomes the existing low degree of comprehensive utilization of sludge pyrolysis biochar and eliminates the potential accumulation pollution of heavy metals in land use of biochar, and provides a method and device for preparing ceramsite by sludge pyrolysis biochar , through the high-temperature ceramsiteization of sludge pyrolysis biochar to realize efficient resource utilization of sludge pyrolysis biochar

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  • A method and device for preparing ceramsite by pyrolyzing biochar from sludge
  • A method and device for preparing ceramsite by pyrolyzing biochar from sludge

Examples

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Effect test

Embodiment 1

[0054] Example 1: Preparation of ceramsite by 100% sludge pyrolysis biochar

[0055] figure 1 It is a diagram of the device for preparing ceramsite by pyrolyzing biochar from sludge. The labels in the attached drawings indicate: 1. Storage bin for biochar from sludge pyrolysis; 2. 1# quantitative feeding device; 5. Grinding device; 6. Humidity control 7. Water adding device; 8. 1# conveying device; 9. Forming and granulating device; 10. 2# conveying device; 11. Drying device; 12. 3# conveying device; 13. Medium temperature pre-burning device; 14. High temperature Pre-burning device; 15. Cooling device.

[0056] like figure 1 As shown, firstly, the sludge pyrolysis biochar in the sludge pyrolysis biochar storage bin 1 is sent to the 1# quantitative feeding device 2, and the sludge biochar of a certain quality is weighed and sent to the grinding device 5 for pulverization. Grinding, controlling the particle size of the grinding material to be less than 100 mesh, and determini...

Embodiment 2

[0058] Example 2: 80% sludge pyrolysis biochar + 20% fly ash to prepare ceramsite

[0059] figure 2It is a diagram of the device for preparing ceramsite by pyrolyzing biochar from sludge. The reference numbers in the attached drawings indicate: 1. Storage bin for sludge pyrolysis biochar; 2. 1# quantitative feeding device; 3. Storage bin for other auxiliary materials; 4. 2# Quantitative feeding device; 5. Grinding device; 6. Humidity control device; 7. Water adding device; 8. 1# conveying device; 9. Forming and granulating device; 10. 2# conveying device; 11. Drying device; 12. 3# conveying device; 13. Medium-temperature pre-burning device; 14. High-temperature pre-burning device; 15. Cooling device.

[0060] like figure 2 As shown, firstly, the sludge pyrolysis biochar in the sludge pyrolysis biochar storage bin 1 is sent to the 1# quantitative feeding device 2, and 80% of the sludge pyrolysis biochar weighing 80% is sent to the grinding device 5, Simultaneously, the fly...

Embodiment 3

[0064] Example 3: 70% sludge pyrolysis biochar + 20% fly ash to prepare ceramsite + 10% kaolin

[0065] like figure 2 As shown, firstly, the sludge pyrolysis biochar in the sludge pyrolysis biochar storage bin 1 is sent to the 1# quantitative feeding device 2, and the sludge pyrolysis biochar weighing 70% is sent to the grinding device 5, At the same time, the mixture of fly ash and kaolin with a mixing ratio of 2:1 in the storage bin 3 of other auxiliary materials is sent to the grinding device 5 for mixing and grinding through the 2# quantitative feeding device 4 weighing 30% of the fly ash , the particle size of the powder and abrasive is controlled to be less than 300 mesh, and the main chemical composition range of the mixture of sludge pyrolysis biochar and fly ash is determined as follows: SiO 2 : 46%, A1 2 o 3 : 19%, Fe 2 o 3 : 7%, CaO+MgO: 6%, K 2 O+Na 2 O: 6%, C: 12%; continue to send the mixed powder and abrasive to the humidity control device 6, add water t...

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Abstract

The invention discloses a method and device for preparing ceramsite from sludge pyrolytic biochar. The method includes the steps that powder grinding, humidifying, pelleting, low-temperature drying, middle-temperature presintering, high-temperature sintering and cooling are carried out on the sludge pyrolytic biochar to obtain the ceramsite. The device comprises a quantitative feeding device, a water adding device, a humidifying device, a forming and pelleting device, a drying device, a middle-temperature presintering device, a high-temperature sintering device and a cooling device. The sludge pyrolytic biochar is used for preparing the ceramsite, large-scale utilization of the sludge pyrolytic biochar is achieved, heavy metal element in the sludge pyrolytic biochar is further efficiently solidified and passivated, potential heavy metal accumulated pollution of the sludge pyrolytic biochar in the land using process is avoided, and the method and device are particularly suitable for resource utilization of sludge pyrolytic biochar with heavy metal content exceeding standard. The method is simple, practical, low in equipment investment and low in cost and has good economic benefits and environmental benefits.

Description

technical field [0001] According to the International Patent Classification (IPC), the invention belongs to the field of ceramsite material preparation, and in particular relates to a method and a device for preparing ceramsite by pyrolyzing biochar from sludge. Background technique [0002] With the rapid development of my country's social economy and urbanization process, the scale of urban sewage treatment plants and the amount of sludge produced continue to increase. At present, the national sludge output is about 30 million tons (moisture content is about 97%), and it is estimated that by 2016 will reach 36 million tons. With the significant improvement of sewage treatment efficiency, the output of municipal sludge is increasing rapidly, and the pressure of municipal sludge disposal is increasing. In the late 1980s, the resource utilization of sludge was valued and developed rapidly, and sludge pyrolysis and gasification technologies developed rapidly. At present, most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B33/132C04B33/135
CPCC04B33/1321C04B33/1352C04B38/00C04B38/0074Y02P40/60
Inventor 余广炜余铖汪印
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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