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Method of utilizing polluted soil and industrial sludge to prepare ceramsite and ceramsite prepared thereby

A technology for polluted soil and industrial sludge, applied in clay products, applications, household appliances, etc., can solve problems such as insufficient treatment capacity of heavy metal polluted soil, achieve low environmental release risk of heavy metals, low heavy metal residue rate, and improve environmental safety. Effect

Inactive Publication Date: 2017-08-18
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems in the prior art, such as insufficient ability to treat heavy metal-contaminated soil, the present invention provides a method for preparing ceramsite by using polluted soil and industrial sludge. The existing ceramsite roasting kiln facilities are used to realize two types of ceramsite through process improvement. The better resource utilization feasibility of waste can simultaneously absorb two types of pollutants, heavy metal polluted soil and industrial sludge, and can prepare ceramsite

Method used

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  • Method of utilizing polluted soil and industrial sludge to prepare ceramsite and ceramsite prepared thereby
  • Method of utilizing polluted soil and industrial sludge to prepare ceramsite and ceramsite prepared thereby
  • Method of utilizing polluted soil and industrial sludge to prepare ceramsite and ceramsite prepared thereby

Examples

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Effect test

Embodiment 1

[0050] The decommissioned soil of an electroplating plant was taken, and its heavy metal copper content was 8321mg / kg, zinc content was 4390mg / kg, chromium 2561mg / kg and nickel 331mg / kg, and the two indicators of arsenic and mercury were not detected. Take the printing and dyeing sludge, the heavy metal copper content is 300mg / kg, and the zinc content is 131mg / kg. Sieve the soil and printing and dyeing sludge according to the particle size standard of 2mm. After sieving, the two are fully mixed according to the mass ratio of 8:2 (soil: mud). Subsequently, a small amount of water is added to the mixture to increase the viscosity (moisture content is adjusted to 35%), and then the mixture is conveyed to the roller granulator for granulation by belt. Place the granulated billets at the tail of the rotary kiln (about 450°C) and keep heating for 40 minutes; then transfer the billets to the main body of the rotary kiln to ensure that the pellets are heated at 600°C for 60 minutes. ...

Embodiment 2

[0057] The decommissioned soil of an electroplating plant was taken, and its heavy metal copper content was 8321mg / kg, zinc content was 4390mg / kg, chromium 2561mg / kg and nickel 331mg / kg, and the two indicators of arsenic and mercury were not detected. Take the printing and dyeing sludge, the heavy metal copper content is 300mg / kg, and the zinc content is 131mg / kg. Sieve the soil and printing and dyeing sludge according to the particle size standard of 2mm. After sieving, fully mix the two according to the mass ratio of 7:3 (soil: mud). Subsequently, a small amount of water was added to the mixture to increase the viscosity (the water content was adjusted to 35%), and then the mixture was conveyed to a double-roll granulator by belt for granulation. Place the granulated billets at the tail of the rotary kiln (600°C) and keep heating for 40 minutes; then transfer the billets to the main body of the rotary kiln to ensure that the pellets are heated at 700°C for 90 minutes. Afte...

Embodiment 3

[0064] The decommissioned soil of an electroplating plant was taken, and its heavy metal copper content was 8321mg / kg, zinc content was 4390mg / kg, chromium 2561mg / kg and nickel 331mg / kg, and the two indicators of arsenic and mercury were not detected. Take the printing and dyeing sludge, the heavy metal copper content is 300mg / kg, and the zinc content is 131mg / kg. Sieve the soil and printing and dyeing sludge according to the particle size standard of 2mm. After sieving, fully mix the two according to the mass ratio of 7:3 (soil: mud). Subsequently, a small amount of water was added to the mixture to increase the viscosity (the water content was adjusted to 40%), and then the mixture was conveyed to a double-roll granulator by belt for granulation. Place the granulated billets at the tail of the rotary kiln (600°C) and keep heating for 40 minutes; then transfer the billets to the main body of the rotary kiln to ensure that the pellets are heated at 800°C for 90 minutes. Afte...

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Abstract

The invention discloses a method of utilizing polluted soil and industrial sludge to prepare ceramsite. The method includes following steps: (1), screening heavy metal polluted soil, mixing with industrial sludge after being smashed and screened, adding water to adjust water content, and granulating; (2), putting blank balls formed after granulation at the tail of a rotary kiln for moisture drying and removing, and transferring the blank balls into a rotary kiln body, and heating the blank balls at 600-800 DEG C for 50-80min to complete preheating of the blank balls; (3), transferring the blank balls into a high-temperature kiln head section after preheating is completed, roasting at 1300-1500 DEG C for 10-60min, and discharging and cooling. Existing ceramsite roasting kiln facilities are utilized, recycling feasibility of two major kinds of waste is realized after process improving, and two major pollutants including the heavy metal polluted soil and the industrial sludge can be eliminated and can be prepared to obtain ceramsite.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment and industrial solid waste treatment and utilization, and in particular relates to a method for preparing ceramsite by using polluted soil and industrial sludge and the prepared ceramsite. Background technique [0002] my country's industrial industry has experienced long-term extensive development. During this process, due to poor management, hardware and technology, some enterprises have caused soil pollution at the original site of the factory. With the accelerated adjustment of my country's urban industrial structure in recent years, a large number of urban industrial enterprises have stopped production and relocated, and the problem of a large number of decommissioned polluted sites has attracted widespread attention from the society. Among the various types of polluted sites, heavy metal polluted sites are more difficult to remediate soil due to their large number, various types of...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B33/132
CPCC04B33/1321C04B33/1327C04B38/009Y02P40/60
Inventor 冯一舰张弛钟重
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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