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Sludge waste mortar unbaked ceramsite and preparation method thereof

A technology of waste mortar and sludge, which is applied in the field of building materials and waste recycling, can solve the problems of high cost, difficult to effectively use, difficult to grind and burn quality of clinker, achieve high-value resource utilization, and reduce land resource occupation , good compactness effect

Active Publication Date: 2019-09-06
YANGZHOU POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waste concrete mortar accounts for about 40% of the total waste concrete, and has a large storage capacity, but it is difficult to be effectively utilized due to its low strength, porous and easy to absorb water
Although some studies have proposed to use waste concrete mortar powder as a cementitious material after heat treatment at a certain temperature, the process is difficult and the cost is high; some people also try to use waste concrete mortar powder as cement clinker raw material after fine grinding, But it will cause the clinker to be difficult to grind and burn and the quality is low
At present, there are few reports on effective utilization methods of waste concrete mortar with high efficiency, low cost and low energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method of unfired ceramsite of sludge waste mortar, the steps are as follows:

[0026] Pass the urban dredging sludge through a sieve of about 15mm to remove larger solid impurities, and the water content of the sludge is determined to be 86%;

[0027] Put the waste concrete mortar into the pulverizer for grinding, and the fineness of the mill is 10% (0.08mm square hole sieve allowance), to obtain the waste concrete mortar powder; cement, mineral powder, fly ash, gypsum, sodium sulfate according to Mix evenly in the ratio of 54:20:20:5:1 to obtain a curing agent; measure and sieve 20 parts of urban dredging sludge, 62 parts of waste concrete mortar powder, 15 parts of curing agent, and 2.5 parts of ethylene-vinyl acetate emulsion , 0.5 parts of carboxymethyl cellulose are sent to the wheel mill, and the wheel is milled for 5 minutes; the evenly stirred mixture is put into the roller granulator, and processed into round granules with a diameter of 1...

Embodiment 2

[0030] A kind of preparation method of unfired ceramsite of sludge waste mortar, the steps are as follows:

[0031] Pass the urban dredging sludge through a sieve of about 15mm to remove larger solid impurities, and measure the water content of the sludge to be 72%;

[0032] Put the waste concrete mortar into the pulverizer for grinding, and the grinding fineness is 13% (0.08mm square hole sieve allowance), to obtain waste concrete mortar powder; cement, mineral powder, fly ash, gypsum, sodium sulfate according to Mix evenly in the ratio of 79:10:10:0.5:0.5 to obtain a curing agent; measure and sieve 40 parts of urban dredging sludge, 38 parts of waste concrete mortar powder, 20 parts of curing agent, and 1.2 parts of ethylene-vinyl acetate emulsion , 0.8 parts of carboxymethyl cellulose are sent to the wheel mill, and the wheel is milled for 3 minutes; the evenly stirred mixture is put into the roller granulator, and processed into round granules with a diameter of 10-20mm; t...

Embodiment 3

[0035] A kind of preparation method of unfired ceramsite of sludge waste mortar, the steps are as follows:

[0036] Pass the urban dredging sludge through a sieve of about 15mm to remove larger solid impurities, and measure the water content of the sludge to be 79%;

[0037] Put the waste concrete mortar into the pulverizer for grinding, and the fineness of the mill is 15% (0.08mm square hole sieve allowance), to obtain the waste concrete mortar powder; cement, mineral powder, fly ash, gypsum, sodium sulfate according to Mix evenly in the ratio of 59:30:5:5:1 to obtain a curing agent; measure and sieve 30 parts of urban dredging sludge, 42 parts of waste concrete mortar powder, 25 parts of curing agent, and 2.0 parts of ethylene-vinyl acetate emulsion 1.0 parts of carboxymethyl cellulose are sent to the wheel mill, and the wheel is milled for 4 minutes; the evenly stirred mixture is put into the roller granulator, and processed into round granules with a diameter of 10~20mm; t...

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Abstract

The invention discloses a sludge waste mortar unbaked ceramsite in the field of building materials. The sludge waste mortar unbaked ceramsite is prepared from, by weight, 20-40 parts of urban dredgedsludge, 38-62 parts of waste concrete mortar, 15-25 parts of a curing agent, 1.0-3.0 parts of ethylene-vinyl acetate emulsion and 0.5-1.0 part of carboxymethyl cellulose, wherein the curing agent is prepared from, by mass, 47-79 parts of cement, 10-30 parts of mineral powder, 5-20 parts of fly ash, 0.5-5 parts of gypsum and 0.5-1 part of sodium sulfate. The raw sludge of the urban dredged sludge is directly utilized without dewatering or thermal incineration treatment, low-energy-consumption and high-value resource utilization of the urban dredged sludge is achieved, and the sludge waste mortar unbaked ceramsite can be used in urban planning and construction.

Description

technical field [0001] The invention relates to ceramsite, in particular to a preparation method of ceramsite, belonging to the field of building materials and waste resources. Background technique [0002] In order to maintain normal functions such as urban water landscape and navigation, urban water bodies need to be dredged regularly, and a large amount of water body sediments produced during the dredging process are called urban dredging sludge. Currently commonly used landfill or stacking disposal methods not only easily cause secondary pollution, but also have high transportation costs and occupy a large amount of land resources. Now many researchers use urban dredging sludge as resources after dehydration or thermal incineration, which often consumes a lot of energy and costs. In addition, waste concrete is sorted from construction waste, and waste concrete recycled aggregate and waste concrete mortar are obtained through crushing, screening and other processes. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/08C04B28/02
CPCC04B28/04C04B28/08C04B28/021C04B2201/50C04B18/141C04B18/08C04B22/143C04B22/147C04B18/0436C04B18/16C04B24/2623C04B24/383
Inventor 吴书安
Owner YANGZHOU POLYTECHNIC COLLEGE