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River and lake sludge-based baking-free ceramsite as well as preparation method and application thereof

A technology of silt and ceramsite, applied in the field of building materials, can solve problems such as low strength, and achieve the effects of excellent performance, reduced production energy consumption, and low energy consumption

Active Publication Date: 2020-01-17
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: Aiming at the problems existing in the prior art, the present invention provides a river and lake silt-based non-fired ceramsite. The present invention turns river and lake silt-like solid waste into resource utilization, and overcomes the existing Due to the disadvantages of low strength and high water absorption of unfired ceramsite, it provides a kind of river and lake mud-based unfired ceramsite with low energy consumption, no need for firing, and excellent performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The method for preparing unfired ceramsite by using high water content river and lake silt, the steps are as follows:

[0034] (1) Pretreatment of raw materials: removing impurities and homogenizing the wet river and lake sludge;

[0035] (2) Ingredients: mix and stir construction gypsum, cement dry material, and polyvinyl alcohol evenly, mix them into wet river and lake mud and stir evenly until a viscous billet is formed;

[0036] Among them, the mass percentages of each material are: wet river and lake sludge: 70%; building gypsum: 3.7%; cement: 25.3%; polyvinyl alcohol: 1%;

[0037] (3) Cake pressing and rubbing to make pellets and rolling balls: the blank is pressed into a cake shape with a thickness of 15mm by the cake pressing groove; the made cake is put into the rubbing groove and cut into strips with a width of 15mm; Granular ceramsite preforms with a diameter of 15 mm are made through the pelletizing tank; the preforms are placed in a drum and rolled to a sp...

Embodiment 2

[0042] The method for preparing unfired ceramsite by using high water content river and lake silt, the steps are as follows:

[0043] (1) Pretreatment of raw materials: removing impurities and homogenizing the wet river and lake sludge;

[0044] (2) Ingredients: ingredients: mix and stir construction gypsum, cement dry material, and polyvinyl alcohol evenly, mix them into wet river and lake mud and stir evenly until viscous billets;

[0045]Among them, the mass percentages of each material are: wet river and lake sludge: 74%; building gypsum: 3%; cement: 22.5%; polyvinyl alcohol: 0.5%;

[0046] (3) Cake pressing and rubbing to make pellets and rolling balls: the blank is pressed into a cake shape with a thickness of 15mm by the cake pressing groove; the made cake is put into the rubbing groove and cut into strips with a width of 15mm; Granular ceramsite preforms with a diameter of 15 mm are made through the pelletizing tank; the preforms are placed in a drum and rolled to a s...

Embodiment 3

[0051] The method for preparing unfired ceramsite by using high water content river and lake silt, the steps are as follows:

[0052] (1) Pretreatment of raw materials: removing impurities and homogenizing the wet river and lake sludge;

[0053] (2) Ingredients: mix and stir construction gypsum, cement dry material, and polyvinyl alcohol evenly, mix them into wet river and lake mud and stir evenly until a viscous billet is formed;

[0054] Among them, the mass percentages of each material are: wet river and lake sludge: 72%; building gypsum: 3.4%; cement: 24.4%; polyvinyl alcohol: 0.5%;

[0055] (3) Cake pressing and rubbing to make pellets and rolling balls: the blank is pressed into a cake shape with a thickness of 15mm by the cake pressing groove; the made cake is put into the rubbing groove and cut into strips with a width of 15mm; Granular ceramsite preforms with a diameter of 15 mm are made through the pelletizing tank; the preforms are placed in a drum and rolled to a ...

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Abstract

The invention discloses river and lake sludge-based baking-free ceramsite as well as a preparation method and application thereof. The river and lake sludge-based baking-free ceramsite is mainly prepared from the following raw materials in percentage by weight: 60-80% of wet river and lake sludge, 1-10% of building gypsum, 15-30% of cement and 0.5-5% of polyvinyl alcohol. According to applicationdisclosed in the invention, river and lake sludge solid waste is turned into wealth, the defects of low strength, high water absorption and the like of the baking-free ceramsite are avoided; and the river and lake sludge-based baking-free ceramsite which is low in energy consumption, free of firing and excellent in performance is provided. Dehydration treatment on river and lake sludge is not necessary, so that cost is reduced; and at the same time, a large amount of high water content river and lake sludge can be consumed, waste utilization is realized, and the obtained product can be used for replacing natural traditional ceramsite raw materials; excellent conditions are provided for hydration hardening reaction through the proper proportion of all the raw materials and auxiliary materials and process optimization, production energy consumption is low, and the produced river and lake sludge-based baking-free ceramsite can meet the market requirements on industrial filter materials and building material lightweight aggregate.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing non-fired ceramsite from river and lake sludge with high water content, a preparation method and application thereof. Background technique [0002] The amount of silt produced in rivers and lakes in various parts of China is huge. According to statistics, the total amount of dredged river and lake silt in China has exceeded 5 billion m 3 ; In addition, various water supply plants, sewage plants, printing and dyeing plants, etc. produce a large amount of waste river and lake silt every year. River and lake sludge is difficult to store and transport due to its high water content. The traditional treatment is drying and dehydration. This method consumes energy and time and has no obvious effect. At present, the main technology for preparing ceramsite from river and lake sludge at home and abroad is the high-temperature sintering method. The sint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B111/40
CPCC04B28/14C04B2201/50C04B2201/20C04B2111/40C04B7/02C04B24/2623C04B18/0418
Inventor 刘荣曹云徐悦清韩燕高鹏
Owner NANJING NORMAL UNIVERSITY