Lightweight high-strength porous ceramsite and preparation method thereof

A high-strength ceramsite, light-weight technology, applied in the field of solid waste treatment and resource utilization, can solve problems such as high unfavorable sintering and performance improvement, and achieve the effects of increased economic added value, excellent performance, and adjustable water absorption.

Inactive Publication Date: 2019-04-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the presence of carbon source Fe 2 o 3 Can generate CO, CO at high temperature 2 So as to play a foaming role, promote the formation of liquid phase and the densification process, but too high content is not conducive to sintering and performance improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A light porous high-strength ceramsite prepared by the following method:

[0033] (1) Dry, grind and sieve the urban lake silt, and control the particle size to meet the 30-mesh sieve balance of less than 15%;

[0034] (2) steel slag is dried, ground and sieved, and the particle size is controlled to meet the requirement of passing through a 400-mesh sieve with a balance of less than 5%;

[0035] (3) Dry, grind and sieve the commercially available Class II fly ash, and control the particle size to meet the requirement of passing through a 400-mesh sieve with a balance of less than 5%;

[0036] (4) Drying commercially available activated carbon, grinding and sieving, controlling the particle size to meet the 200-mesh sieve balance and less than 20%;

[0037] (5) Take by weighing according to the mass percentage of each raw material: 65% of urban lake silt, 10% of steel slag, 20% of commercially available grade II fly ash, 5% of commercially available activated carbon, p...

Embodiment 2

[0041] A light porous high-strength ceramsite prepared by the following method:

[0042] (1) Dry, grind and sieve the urban lake silt, and control the particle size to meet the 30-mesh sieve balance of less than 15%;

[0043] (2) steel slag is dried, ground and sieved, and the particle size is controlled to meet the requirement of passing through a 400-mesh sieve with a balance of less than 5%;

[0044] (3) Dry, grind and sieve the commercially available Class II fly ash, and control the particle size to meet the requirement of passing through a 400-mesh sieve with a balance of less than 5%;

[0045] (4) Drying commercially available activated carbon, grinding and sieving, controlling the particle size to meet the 200-mesh sieve balance and less than 20%;

[0046] (5) Weighing according to the mass percentage of each raw material: 55% of urban lake sludge, 15% of steel slag, 20% of commercially available Class II fly ash, 7% of commercial mineral powder, and 3% of coke mixtur...

Embodiment 3

[0050] A light porous high-strength ceramsite prepared by the following method:

[0051] (1) Dry, grind and sieve the urban lake silt, and control the particle size to meet the 30-mesh sieve balance of less than 15%;

[0052] (2) steel slag is dried, ground and sieved, and the particle size is controlled to meet the requirement of passing through a 400-mesh sieve with a balance of less than 5%;

[0053] (3) Dry, grind and sieve the commercially available Class II fly ash, and control the particle size to meet the requirement of passing through a 400-mesh sieve with a balance of less than 5%;

[0054] (4) Drying commercially available activated carbon, grinding and sieving, controlling the particle size to meet the 200-mesh sieve balance and less than 20%;

[0055] (5) Take by weight according to the mass percentage of each raw material: 60% of urban lake sludge, 20% of steel slag, 12% of commercially available grade II fly ash, 8% of coke mixture, and place them in a ball mil...

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Abstract

The invention belongs to the field of solid waste treatment and resource utilization, and particularly relates to a lightweight high-strength porous ceramsite and a preparation method thereof. The preparation method of the lightweight high-strength porous ceramsite comprises the following steps of: respectively drying, pulverizing and sieving sludge, steel slag, a correcting agent and a foaming agent which are used as raw materials, then carrying out ball-milling, uniformly mixing, granulating, drying, pre-firing, sintering and quickly cooling to obtain the lightweight high-strength porous ceramsite. The lightweight high-strength porous ceramsite comprises the following raw materials in parts by mass: 50-70 parts of sludge, 10-25 parts of steel slag, 10-30 parts of collecting agent, and 0-10 parts of foaming agent. The lightweight high-strength porous ceramsite is prepared by compounding the sludge and the steel slag for the first time, adjusting the ratio of the raw materials and designing the calcination process. The prepared lightweight porous high-strength porous ceramsite has excellent performance, and the bulk density, strength and water absorption rate of the lightweight porous high-strength porous ceramsite are adjustable. The preparation method has simple process and solves the problems of difficult disposal of the sludge and the steel slag, low utilization rate and added economic value and the like; and compared with the traditional disposal method, the preparation method greatly improves the added economic value.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and resource utilization, and in particular relates to a light-weight, high-strength porous ceramsite and a preparation method thereof. Background technique [0002] Steel slag is a by-product of the production process. Taking steel slag as an example, steel slag accounts for about 10-15% of crude steel production. In 2016, 162 million tons of steel slag were produced nationwide. Although a lot of research has been carried out on the resource utilization of steel slag, due to its large output, poor activity, non-grinding and stability problems, it is currently difficult to use it on a large scale and has a single utilization structure. The stockpiling of steel slag has seriously affected the health of my country's metallurgical industry sustainable development. Therefore, it is of great significance to find ways to utilize steel slag with high efficiency and high economic added value. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B33/132C04B33/138C04B33/13C04B33/135
CPCC04B33/13C04B33/1321C04B33/1352C04B33/138C04B38/009C04B38/10C04B2235/6567C04B2235/661C04B2235/77C04B2235/96C04B38/0067Y02P40/60
Inventor 胡曙光钱雄王发洲何永佳丁庆军
Owner WUHAN UNIV OF TECH
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