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Method for sintering ceramsite by using building waste materials and sludge

A technology of construction waste and ceramsite, which is applied in the field of construction, can solve the problems of heavy metal dissolution, reduce the quality of ceramsite, etc., achieve the effect of reasonable price, increase product strength, and facilitate popularization

Inactive Publication Date: 2014-11-26
XIAMEN YUANLIDA BUILDING MATERIAL MEMBER ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in existing inventions, sludge is not used as long as the ceramsite after sintering has the problem of heavy metal dissolution during use.
The sludge is not viscous, and there are other dyes in the sludge that will crack when processed into ceramsite, which greatly reduces the quality of ceramsite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the preparation of ceramsite

[0025] The raw materials of this example are construction waste and dried sludge. The sludge used as raw material has a moisture content of 55-60% and a bulk density of 0.76-1.15g / cm 3 . The heavy metal content of the sludge in the sewage treatment plant is different according to the treated sewage. In this example, the heavy metal dry basis content of the sludge is: Cu 281.3mg / kg, Zn 601.7mg / kg, Pb 166.6 mg / kg, Cd 2.1 mg / kg, Cr 94.8 mg / kg, Ni 65.6 mg / kg, Hg 1.7 mg / kg, As 7.53 mg / kg.

[0026] The process is to crush the construction waste first, dry the milling sludge, then mix it with fly ash and clay, then press it into shape, and sinter the energy products. When sintering ceramsite, the percentage by weight is: construction waste 35%, sludge 35%, fly ash 10%, clay 20%, the sintering temperature is 1200-1400 ° C, the time is 40 minutes, and then cooled to room temperature. When sintering, the mixed melting point is low...

Embodiment 2

[0040] The raw materials of this example are construction waste and dried sludge. The sludge used as raw material has a moisture content of 55-60% and a bulk density of 0.76-1.15g / cm 3 . Sludge from sewage treatment plants has different heavy metal content according to the treated sewage. The dry basis content of heavy metal in the sludge obtained in this study is: Cu 287.3mg / kg, Zn 603.5mg / kg, Pb 176.6 mg / kg, Cd 1.8 mg / kg, Cr 93.2 mg / kg, Ni 56.7 mg / kg, Hg 1.65 mg / kg, As 8.01 mg / kg.

[0041] The construction waste dewatered sludge is pressed dry first, then mixed with fly ash and clay, pressurized and sintered to form a finished product. When firing ceramsite, according to the weight percentage: 30% of construction waste, 35% of sludge, 15% of fly ash, and the rest is 20% of clay. After mixing and granulating evenly, sintering at 1200-1400°C for 40 minutes, and then cooling to Just normal temperature.

[0042] The ceramsite prepared in Example 2 was used for heavy metal le...

Embodiment 3

[0055] Embodiment 3: the preparation of ceramsite

[0056] The raw materials of this example are construction waste and dried sludge. The sludge used as raw material has a moisture content of 55-60% and a bulk density of 0.76-1.15g / cm 3 . The heavy metal content of the sludge in the sewage treatment plant is different according to the treated sewage. In this example, the heavy metal dry basis content of the sludge is: Cu 281.3mg / kg, Zn 601.7mg / kg, Pb 166.6 mg / kg, Cd 2.1 mg / kg, Cr 94.8 mg / kg, Ni 65.6 mg / kg, Hg 1.7 mg / kg, As 7.53 mg / kg.

[0057] The process is to crush the construction waste first, dry the milling sludge, then mix it with fly ash and clay, then press it into shape, and sinter the energy products. When sintering ceramsite, the percentage by weight is: construction waste 33%, sludge 35%, fly ash 12%, clay 20%, the sintering temperature is 1200-1400°C, the time is 40 minutes, and then cooled to room temperature. When sintering, the mixed melting point is lowe...

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Abstract

The invention discloses a method for sintering ceramsite by using building waste materials and sludge. Raw materials comprise, by weight, 30-35% of the building materials, 35% of the sludge, 10-15% of fly ash and 20% of clay. Specifically, the method comprises the steps of smashing and grinding the building waste materials into powder; pressing the sludge to a dry state; then mixing the building material powder and the dried sludge with the fly ash and the clay; stirring; shaping by pressurization; and then sintering for 40 minutes at a temperature of 1,200-1,400 DEG C. Utilization rate of waste materials in the process method is high; a sintered product through reasonable proportions has the advantages of light weight, high strength, fire resistance and water resistance; cracking phenomenon of a product produced by a firstly forming process is prevented; and the strength of the product is enhanced. The ceramsite obtained by the method can be widely used as filler for building aggregate, filtration of production and domestic water, and verdurization, does not produce secondary pollution in a use process and has a reasonable price.

Description

Technical field [0001] The present invention involves the construction field, especially a method that uses construction waste and sludge sintering pottery. Background technique [0002] With the construction of cities in various places, the construction of construction waste and sewage treatment facilities and the increase in sewage treatment rates, the production of construction waste sludge is increasing.At present, the main construction waste and sludge disposal methods include land use, landfilling, incineration treatment, and water elimination.The risk of land use has the risk of heavy metal pollution; landfills have high demand for the property of the sludge of construction waste and need to be treated with ground -based anti -seepage;Time pollution. [0003] Because there are certain defects in the treatment methods of the above -mentioned construction waste sludge, how to use appropriate methods to deal with building waste and sludge, and can achieve the purpose of being...

Claims

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Application Information

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IPC IPC(8): C04B38/00
Inventor 洪友景
Owner XIAMEN YUANLIDA BUILDING MATERIAL MEMBER ENG
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