Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing granular activated carbon from sludge

A technology of sludge granules and activated carbon, which is applied in chemical instruments and methods, inorganic chemistry, and other chemical processes, can solve the problems of inconvenient use of powdered activated carbon, low carbon content in sludge, and low added value of products, and achieve The effect of saving production energy consumption, reducing environmental pollution and prolonging the service life of equipment

Pending Publication Date: 2022-01-04
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sludge incineration will produce dioxins, odors and corrosive gases, which are highly corrosive to boilers and power generation equipment in high temperature environments, so it is imperative to develop a new sludge treatment method
There is a study of simply adopting the method of heat treatment to prepare powdery activated carbon from sludge, but because the carbon content of sludge is low (carbon content is less than 60%), the adsorption performance of the prepared product is very low (iodine adsorption value is less than 500mg / g, The methylene blue adsorption value is less than 65mg / g), and the powdered activated carbon is inconvenient to use, and the added value of the product is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of sludge granular activated carbon and its preparation method, is first to dry the sludge at 120 DEG C, control its moisture below 15%, and then press (1.0-3.0) the sludge, powdery molasses waste charcoal and wood tar: (0.5-2.0): (0.05-0.1) weight ratio, after stirring at 80-150°C, extrude into granules, harden the shaped granules for 1-3 hours, and then heat the shaped granules to 250-400°C Pre-carbonize for 1-3 hours, and finally, use water vapor as an activator to activate the above-mentioned treated material at 500-700°C for 2-4 hours to make sludge activated carbon and sludge granules The activated carbon product has an iodine adsorption value of more than 750mg / g, a methylene blue adsorption value of more than 75mg / g, and an abrasion resistance of more than 80%. It can be widely used in the fields of gas phase and liquid phase adsorption.

Embodiment 2

[0023] A kind of sludge granular activated carbon and its preparation method, is to first dry the sludge at 120 ℃, control its water content below 15%, and then mix the sludge, powdered molasses waste carbon and wood tar according to the ratio of 1.0:0.5:0.05 Weight ratio, after stirring at 80°C, extrude into granules, harden the shaped granules for 1 hour, then heat the shaped granules to 250°C for pre-carbonization for 1 hour, finally, use water vapor as an activator, The final material is activated and reacted at 500°C for 2 hours, and then it can be made into sludge activated carbon. The iodine adsorption value of the prepared sludge granular activated carbon product is 780mg / g, the methylene blue adsorption value is 75mg / g, and the wear resistance is 85%.

Embodiment 3

[0025] A kind of sludge granular activated carbon and its preparation method, is to first dry the sludge at 120°C, control its water content below 15%, and then mix the sludge, powdered molasses waste carbon and wood tar according to the ratio of 3.0:2.0:0.1 Weight ratio, after stirring at 150°C, extrude into granules, harden the shaped granules for 3 hours, then heat the shaped granules to 400°C for pre-carbonization for 3 hours, and finally, use water vapor as an activator, The raw material can be activated and reacted at 700°C for 4 hours to make sludge activated carbon. The iodine adsorption value of the prepared sludge granular activated carbon product is 920mg / g, the methylene blue adsorption value is 135mg / g, and the wear resistance is 82%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Iodine adsorption valueaaaaaaaaaa
Adsorption value of methylene blueaaaaaaaaaa
Iodine adsorption valueaaaaaaaaaa
Login to View More

Abstract

The invention discloses sludge-based granular activated carbon and a preparation method thereof. The preparation method comprises the following steps: drying sludge at 120 DEG C, controlling the water content of the sludge to be 15% or below, uniformly stirring the sludge, powdery molasses waste carbon and wood tar according to a weight ratio of (1.0-3.0): (0.5-2.0): (0.05-0.1) at 80-150 DEG C, conducting extruding into granules, hardening the formed granules for 1-3 hours, then heating the formed particles to 250-400 DEG C for pre-carbonization for 1-3 hours, and finally, carrying out an activation reaction on the treated material at 500-700 DEG C for 2-4 hours by adopting water vapor as an activating agent so as to prepare the sludge activated carbon. A prepared sludge-based granular active carbon product has an iodine adsorption value of more than 750 mg / g, a methylene blue adsorption value of 75 mg / g or more and abrasive resistance of more than 80%, and can be widely applied to the field of gas phase and liquid phase adsorption.

Description

technical field [0001] The invention belongs to the field of sludge treatment, in particular to a method for preparing granular activated carbon from sludge. Background technique [0002] Sludge is formed from the solid sedimentation of water and wastewater treatment processes. Sludge contains C, H, O, N, S, P, K and other elements, which are valuable resources that can be used. At the same time, sludge is a kind of harmful waste in the environment, which can deteriorate the soil and poison the food. , causing harm to the human body. The traditional sludge treatment process involves three treatment methods: landfill, incineration or composting, each of which has its own advantages and disadvantages. In recent years, sludge incineration power generation has been favored by industry insiders. However, sludge incineration will produce dioxins, odors and corrosive gases, which are highly corrosive to boilers and power generation equipment in high temperature environments, so ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J20/20B01J20/30C01B32/324C01B32/336
CPCB01J20/20C01B32/324C01B32/336
Inventor 刘石彩王亚利王傲许伟卢辛成
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com