Method of preparing ceramsite by utilizing municipal sewage plant sludge and waste glass

A technology for urban domestic sewage and waste glass, which is applied in the field of solid waste treatment and recycling, can solve the problems of inability to achieve large-scale treatment and disposal of sludge, failure to reach building materials, and low usage, so as to improve environmental stability and The effect of safety, high added value and stable performance

Inactive Publication Date: 2014-01-29
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on sludge ceramsite mainly focuses on sludge as an organic additive in ceramsite firing, and its usage is small, only about 10%, which cannot achieve the purpose of large-scale treatment and disposal of sludge
If the mixing ratio is higher than 10%, due to the release of water and organic matter, the product will show a porous and loose structure, which cannot meet the requirements of building material standards

Method used

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  • Method of preparing ceramsite by utilizing municipal sewage plant sludge and waste glass
  • Method of preparing ceramsite by utilizing municipal sewage plant sludge and waste glass
  • Method of preparing ceramsite by utilizing municipal sewage plant sludge and waste glass

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A. Crumble and grind the waste glass (container glass) powder with 80 parts by mass, pass through a 200-mesh sieve, add 100 parts by mass of sludge while stirring at a speed of 20 r / min at room temperature, and add Foaming agent limestone 5 parts, continuously stirred and mixed to form a uniform sludge + glass powder batch.

[0032] B. Put the batch material formed in A into the granulator to extrude and granulate to make 1cm particle size pellets and put them into the rotary kiln.

[0033] C. Control the roasting heating rate to 5°C / min, raise the temperature to 350°C, preheat at 350°C for 20 minutes, then raise the temperature to 1100°C at a heating rate of 5°C / min, and roast at this temperature for 30 minutes.

[0034] D. Use natural cooling to lower the furnace temperature to room temperature naturally to obtain glass ceramsite.

Embodiment 2

[0036] A. The waste glass (plate cullet) powder with a mass component number of 70 is crushed, ground, passed through a 200 mesh sieve, and 100 parts of sludge with a mass component number is added while stirring at a speed of 30 r / min at room temperature, and added 3 parts of foaming agent limestone, continuously stirred and mixed to form a uniform sludge + glass powder batch.

[0037] B. Extrude and granulate the batch formed in A to make pellets with a particle size of 0.5 cm, and put them into a rotary kiln.

[0038] C. Control the roasting heating rate to 3°C / min, raise the temperature to 355°C, preheat at 355°C for 23 minutes, then raise the temperature to 1000°C at a heating rate of 5°C / min, and roast at this temperature for 30 minutes.

[0039] D. Use natural cooling to lower the furnace temperature to room temperature naturally to obtain glass ceramsite.

Embodiment 3

[0041] A. The waste glass (flat cullet and container glass) powder with a mass component number of 100 is crushed, ground, passed through a 200 mesh sieve, and 100 parts of mass component sludge is added while stirring at a speed of 25 r / min at room temperature. And add 5 parts of foaming agent limestone, stir and mix continuously to form a uniform sludge + glass powder batch material.

[0042] B. Extrude and granulate the batch formed in A to make 1cm pellets and put them into the rotary kiln.

[0043] C. Control the roasting heating rate to 5°C / min, raise the temperature to 350°C, preheat at 350°C for 20 minutes, then raise the temperature to 1050°C at a heating rate of 5°C / min, and roast at 1050°C for 30 minutes.

[0044] D. Use natural cooling to lower the furnace temperature to room temperature naturally to obtain glass ceramsite.

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Abstract

The invention relates to a method of preparing ceramsite by utilizing municipal sewage plant sludge and waste glass, belonging to the technical field of solid waste treatment and disposal and recycling. The method comprises the following steps: crushing dehydrated sludge with moisture content of 75%-85%, crushing and ball-milling the waste glass into 200 meshes, and mixing and adding according to a certain proportion; adding 1%-5% of a foaming agent; extruding and pelletizing after stirring, and conveying to a ceramsite rotary kiln for firing through a conveyor. The excellent glass ceramsite fired by the method disclosed by the invention has a compact glaze surface, light weight and high strength, satisfies national standard GB / T17431.2-2010, and mechanical performance and harmful substance content inspection results of the ceramsite satisfies the requirements of the national standard; the obtained glass ceramsite can be used in projects such as houses, road surfaces and bridges. The method disclosed by the invention changes waste into things of value and protects the environment, not only satisfies sustainable development direction of the ecological building material industry, but also is an effective way of recycling the sludge from municipal sewage plants.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, disposal and resource utilization, in particular to a method for preparing ceramsite by using urban sewage plant sludge and waste glass. Background technique [0002] The treatment of urban sludge is a serious and urgent problem facing the world. The harm of sludge to the environment mainly includes deteriorating water quality, polluting soil and crops, among which heavy metals are a major cause of pollution. Traditional technology The method is to landfill and incinerate the sludge, which will cause secondary pollution to the environment. At present, the sludge treatment and disposal technologies mainly include landfill, incineration, building materials and composting. Ceramsite is a kind of aggregate with light weight and certain strength, which is mainly fired at high temperature. At present, the research on sludge ceramsite mainly focuses on sludge as an organic additive in ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00C04B14/02
Inventor 吴彦瑜彭晓春
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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