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Light-weight ceramsites of riverway sludge and production method for same

A technology of river silt and lightweight ceramsite, which is applied in the field of lightweight aggregates, can solve the problems of secondary pollution of the surrounding environment, achieve the effects of reducing moisture content and organic matter content, protecting the ecological environment, and ensuring the composition of raw materials

Inactive Publication Date: 2012-06-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, our country only adopts temporary burying method for dredging silt from rivers and lakes, which will cause secondary pollution to the surrounding environment at the same time occupying land

Method used

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  • Light-weight ceramsites of riverway sludge and production method for same
  • Light-weight ceramsites of riverway sludge and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Urban river dredging silt is firstly filtered to remove impurities, and then preliminarily homogenized in the silt yard. The homogenized river silt is dried in sequence and aged for at least 14 days to control the moisture content to about 15-20%. Then it is formed into balls by a double-roller granulator, and the raw meal balls made are input into a double-tube rotary kiln with a temperature of 280°C at the kiln tail. The rotating speed is 2.5-3 rpm, the rotating speed of the roasting kiln is 3-4 rpm, drying in the drying zone with a temperature of 300°C for 20 minutes, entering the preheating zone with a preheating temperature of 600°C for 15 minutes, and finally entering the After firing the firing zone at a firing temperature of 1150°C for 10 minutes, unload the hot ceramsite at a temperature of about 1000°C from the kiln head, and send it to the cooling equipment for cooling, and then the 500-grade (kg / m2) can be fired. 3 ) lightweight ceramsite.

[0034]After tes...

Embodiment 2

[0036] After removing impurities, homogenizing, drying and aging the dredged sludge of urban rivers, the moisture content is controlled to be about 20%, and then it is formed into balls by a double-roller granulator, and the raw meal balls made are input into the kiln tail at a temperature of 280°C In the double-tube rotary kiln, the inclination angle of the double-tube rotary kiln is 1.5-2 degrees, the speed of the small kiln for drying and preheating is 2.5-3 rpm, and the speed of the large kiln for roasting is 3-4 rpm. ℃ drying zone for 20 minutes, enter the preheating temperature of 600 ℃ in the preheating zone for 15 minutes, and finally enter the firing temperature of 1180 ℃ in the sintering zone for 8 minutes, and you can fire 300 grades (kg / m 3 ) lightweight ceramsite.

[0037] After testing, all the performance indexes of the lightweight ceramsite obtained in this example meet the requirements of the national standard GB2839-81 for clay ceramsite.

Embodiment 3

[0039] After removing impurities, homogenizing, drying, and aging the dredged sludge of urban rivers, the moisture content is controlled to be about 18%, and then it is formed into balls by a double-roller granulator. In the double-tube rotary kiln, the inclination angle of the double-tube rotary kiln body is 1.5-2 degrees, the speed of the small kiln for drying and preheating is 2.5-3 rpm, and the speed of the large kiln for roasting is 3-4 rpm. ℃ drying zone for 30 minutes, enter the preheating temperature of 400 ℃ in the preheating belt for 15 minutes, and finally enter the firing temperature of 1200 ℃ in the firing zone for 6 minutes, and then the 300 grade (kg / m 3 ) lightweight ceramsite.

[0040] After testing, all the performance indexes of the lightweight ceramsite obtained in this example meet the requirements of the national standard GB2839-81 for clay ceramsite.

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Abstract

The invention relates to a light-weight ceramsites of riverway sludge and a production method for the same. The light-weight ceramsites of riverway sludge disclosed by the invention are obtained by using riverway sludge as a main raw material, and then performing impurity removal and homogenization, drying and ageing, granulation, roasting and screening to prepare a finished product. The light-weight ceramsites of riverway sludge prepared by 100% of urban riverway sludge have a bulk density of 300-500 kg / m<3>, wherein a part of the riverway sludge can be replaced by other kinds of clay raw materials such as lake sludge and marsh sludge. The various performance indexes of the ceramsites industrially produced from riverway sludge achieve the requirements of the national standard GB2839-81 of clay ceramsites. In the light-weight ceramsites of riverway sludge and the production method for the same disclosed by the invention, riverway sludge is used for replacing clay to realize development and utilization for waste, and to protect farmland, so that great social benefits, economic benefits and environmental benefits are obtained.

Description

technical field [0001] The present invention relates to a kind of light-weight aggregate and its production method for making light-weight thermal insulation wall material by using river channel silt as the main raw material, in particular to a kind of light-weight thermal insulation ceramsite fired with pure river channel silt and its production method. Background technique [0002] River silt is one of the important types of municipal solid waste. The dredging of waterways, rivers and lakes and other dense water networks in our country will produce a lot of silt. At present, our country only adopts temporary burying method for dredging silt of rivers and lakes, occupying land will cause secondary pollution of the surrounding environment at the same time. How to effectively, adapt measures to local conditions, and recycle river silt is of great significance to avoid secondary pollution, recycle resources, and build a conservation-oriented society. [0003] As early as 197...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/30
CPCY02W30/91
Inventor 蒋正武田润竹桂苗苗韩超杨正宏
Owner TONGJI UNIV
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