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Low-temperature burning method for sludge glass ultra-light haydite

A technology of ultra-light pottery and sludge, which is applied in the field of building materials, can solve the problems of high firing temperature, and achieve the effects of low bulk density, high cylinder compressive strength, and good strength

Inactive Publication Date: 2008-07-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The firing temperature of the existing sludge ceramsite is above 1050°C, and some are even fired at 1250°C, which has the disadvantage of high firing temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Example 1: Add urban domestic dry sludge, waste glass powder, and borax to a ball mill at a weight ratio of 20:75:5 and grind for 8 hours. The purpose is to grind the raw materials and mix them thoroughly. Add 20% water, and then grind the mud into balls. Put the raw meal balls in an oven and dry at 105°C for 2 hours, then put them into an electric furnace, and fire them with the following temperature system: room temperature to 300°C, heating rate 20°C / min, 300°C for 50 minutes, 300°C to 850°C ℃ heating rate 15 ℃ / min, 850 ℃ heat preservation 20min, cooling stage 850 ℃ ~ 700 ℃ rapid cooling, 700 ℃ ~ 500 ℃ slow cooling, rapid cooling below 500 ℃, slow cooling stage cooling rate: 10 ℃ / min, rapid cooling Stage cooling rate: 20°C / min. Through the above steps, a bulk density of 392.4Kg / m can be obtained 3 , the cylinder compressive strength is 1.3Mpa, the water absorption rate is 4%, and it is a ceramsite product that meets the national light aggregate and its test metho...

example 2

[0022] Example 2: Add urban domestic dry sludge, waste glass powder, and borax to a ball mill at a weight ratio of 40:58:2 and grind for 8 hours. The purpose is to grind the raw materials and mix them thoroughly. Add 30% water, and then practice the mud into balls. Put the raw meal balls in an oven and dry at 105°C for 2 hours, then put them into an electric furnace, and fire them with the following temperature system: room temperature to 500°C, heating rate 20°C / min, 500°C for 30 minutes, 500°C to 950°C ℃ heating rate 15 ℃ / min, 950 ℃ heat preservation for 8 minutes, rapid cooling at 950 ℃ to 700 ℃ in the cooling stage, slow cooling at 700 ℃ to 500 ℃, rapid cooling below 500 ℃, cooling rate in the slow cooling stage: 10 ℃ / min, rapid cooling Stage cooling rate: 20°C / min. Through the above steps, a bulk density of 384.7 Kg / m can be obtained 3 , the cylinder compressive strength is 1.2MPa, the water absorption rate is 6%, and it is a ceramsite product that meets the national li...

example 3

[0023] Example 3: Add urban domestic dry sludge, waste glass powder, and borax into a ball mill at a weight ratio of 47:47:6 and grind for 8 hours. The purpose is to make the raw materials finely ground and fully mixed. Add 30% water, and then practice the mud into balls. Put the raw material balls in an oven and dry at 105°C for 2 hours, then put them into an electric furnace, and fire them with the following temperature system: room temperature to 600°C, heating rate 20°C / min, 600°C for 20 minutes, 600°C to 900°C ℃ heating rate 15 ℃ / min, 900 ℃ heat preservation 15min, cooling stage 900 ℃ ~ 700 ℃ rapid cooling, 700 ℃ ~ 500 ℃ slow cooling, 500 ℃ rapid cooling, slow cooling stage cooling rate: 10 ℃ / min, rapid cooling Stage cooling rate: 20°C / min. Through the above steps, a bulk density of 380.4Kg / m can be obtained 3 , Cylinder compressive strength 1.2Mpa, water absorption rate 6%, ceramsite products in line with national standards for light aggregates and their test methods...

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Abstract

A process for preparing super lightweight ceramsite of baking sludge glass at low temperature belongs to the field of architectural materials. The baking temperature of the ceramsite employing the sludge as main raw material is more than 1100DEG C with high baking temperature and high energy consumption. The invention employs waste glass power and sludge as main raw materials in the ceramsite formula, and one of sodium silicofluoride and borax as auxiliary raw material, then super lightweight ceramsite of baking sludge glass is baked at low temperature, the invention has the advantage of energy conservation. The mass mixing ratio for dispensing of the formula comprises urban domestic dry sludge of 20%-70%, waste glass powder of 25%-75% and auxiliary raw material of 2%-6%, discharging carbon at a low temperature of 300DEG C-600DEG C and baking at a temperature of 850DEG C-950DEG C to obtain ceramsite, the property of which meets the Lightweight Aggregates and its Test Methods GB / T 17431.1-1998 Standards.

Description

technical field [0001] The invention discloses a preparation method for firing ultra-light environment-friendly ceramsite at low temperature by using sludge and waste glass powder, which belongs to the technical field of building materials. Background technique [0002] With the acceleration of urbanization and economic development, urban sewage has increased substantially, and a large amount of domestic sludge from urban sewage plants has been produced. How to dispose of these sludge to avoid secondary pollution has become an urgent problem to be solved by countries all over the world. Tao Pellets have been studied as a means of handling sludge. Waste glass, as a kind of solid waste, has also been applied in the development of building ceramsite. [0003] The firing temperature of the existing sludge ceramsite is all above 1050°C, and some are even fired at 1250°C, which has the disadvantage of high firing temperature. In the preparation process of glass ceramsite, becaus...

Claims

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Application Information

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IPC IPC(8): C04B33/32C04B33/16
Inventor 严建华王峰王亚丽崔素萍兰明章王子明李智丰刘大成
Owner BEIJING UNIV OF TECH
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