Method for preparing non-sintered ceramsite by adding dredged sludge

A technology for dredging sediment and ceramsite, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of undiscovered patent publications, unfavorable cost control, and large energy consumption, etc., to promote Dissolution and diffusion, simple maintenance steps, and low production energy consumption

Active Publication Date: 2015-11-11
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramsite is formed by firing. Although the ceramsite ball can be fully densified and the strength of the ceramsite can be improved, the firing process requires a lot of energy, which is not good for cost control.
[0004] Through the search, no patent publications related to the patent application of the present invention have been found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing unfired ceramsite by adding dredged bottom mud, the steps are as follows:

[0034] 1. Pretreatment of dredged sediment: crush the dredged sediment with a pulverizer to 100 mesh and 10% moisture content;

[0035] 2. Ingredients: the dry mix is ​​made up of dredging bottom mud, cement, quicklime, gypsum, and fly ash, and the mass percentage of the dry mix and water glass is 100%; the content of each component is: according to the content of each raw material In terms of mass percentage, 80% of dredged bottom mud, 3% of cement, 3% of quicklime, 3% of gypsum, and 5% of fly ash; the mixed solution is composed of water glass and water, of which water glass is 6%, and the amount of water is 50% of all solid materials %;

[0036] 3. Disc granulation: The granulation temperature is 5°C, the granulation pressure is 80kPa, intermittently add the dry mixture to the disk granulator, and spray 0.1 part of the mixture of water glass and water for each part of t...

Embodiment 2

[0042] A method for preparing unfired ceramsite by adding dredged bottom mud, the steps are as follows:

[0043] 1. Pretreatment of dredged bottom sludge: pulverize the dredged bottom sludge to 100 mesh and moisture content of 8% with a pulverizer;

[0044] 2. Ingredients: the dry mix is ​​made up of dredging bottom mud, cement, quicklime, gypsum, and fly ash, and the mass percentage of the dry mix and water glass is 100%; the content of each component is: according to the content of each raw material In terms of mass percentage, dredged bottom mud is 80%, cement 4%, quicklime 2%, gypsum 2%, fly ash 6%; the mixed solution is composed of water glass and water, wherein water glass is 6%, and the amount of water is 55% of all solid materials %;

[0045] 3. Disc granulation: The granulation temperature is 30°C, the granulation pressure is 100kPa, intermittently add the dry mixture to the disk granulator, and spray 0.4 parts of the mixture of water glass and water for each part of...

Embodiment 3

[0051] A method for preparing unfired ceramsite by adding dredged bottom mud, the steps are as follows:

[0052] 1. Pretreatment of dredged sediment: pulverize the dredged sediment with a pulverizer to 200 mesh and a moisture content of 7%;

[0053] 2. Ingredients: the dry mix is ​​made up of dredging bottom mud, cement, quicklime, gypsum, and fly ash, and the mass percentage of the dry mix and water glass is 100%; the content of each component is: according to the content of each raw material In terms of mass percentage, dredged bottom mud is 75%, cement 5%, quicklime 3%, gypsum 3%, fly ash 7%; the mixed solution is composed of water glass and water, wherein water glass is 7%, and the amount of water is 58% of all solid materials %;

[0054] 3. Disc granulation: The granulation temperature is 27°C, the granulation pressure is 101kPa, intermittently add the dry mixture to the disk granulator, and spray 0.6 parts of the mixed solution of water glass and water for every 1 part ...

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Abstract

The invention relates to a method for preparing non-sintered ceramsite by adding dredged sludge. The method comprises the following steps: (1) pre-treatment of the dredged sludge; (2) material preparation: mixing and stirring smashed dredged sludge, cement, quick lime, gypsum and coal ash to prepare a dry mixture; the mass portions of the smashed dredged sludge, cement, quick lime, gypsum and coal ash are as follows: 60 to 80 parts of the dredged sludge, 1 to 6 parts of the cement, 1 to 6 parts of the quick lime, 1 to 6 parts of the gypsum and 3 to 15 parts of the coal ash; then uniformly mixing water glass with water to obtain a mixed solution of the water glass and the water, wherein the mass ratio of the adding amount of the water glass to the dredged sludge is 3 to 15: 60 to 80, and the adding amount of the water accounts for 40 to 60 percent of the total mass of the dry mixture and the water glass; (3) disc granulation; (4) primary curing of a product; (5) waterproofing work; (6) ultimate curing of the product, namely obtaining a finish product of the non-sintered ceramsite. According to the method provided by the invention, a large amount of dredged sludge can be added, the purpose of utilizing waste materials is realized, the requirements of a dredging Industry are met, the production energy consumption is low, and the produced non-sintered ceramsite can meet the demands of construction market.

Description

technical field [0001] The invention belongs to the technical field of dredging industry and building materials, in particular to a method for preparing unfired ceramsite by adding dredged bottom mud. Background technique [0002] Dredged sediment is produced by the treatment of water body sediment through dredging engineering. In recent years, due to the rapid development of my country's dredging industry, the annual dredging volume has exceeded 1 billion cubic meters. Dredged sediment has the characteristics of high void ratio, high water content, low strength and poor permeability, and the pollution of water body sediment is becoming more and more serious. The pollutants in the sediment are mainly heavy metals, nitrogen and phosphorus-based nutrients and refractory organic matter These characteristics make the performance of dredged sediment deteriorate and restrict its use. Long-term accumulation will cause environmental pollution. The resource utilization of dredged se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B18/04
CPCY02W30/91
Inventor 吴燕周颜贾瑞于浩
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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