Method for burning haydite by solid castoff

A technology of solid waste and ceramsite, applied in the field of building materials, can solve the problems of lower sintering temperature, low softening temperature, poor plasticity, etc., and achieve the effects of low water absorption, high cylinder compressive strength and low bulk density

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

[0005] The present invention uses coal gangue, urban domestic dry sludge and recycled waste glass powder as main raw materials, and the composition of coal gangue is close to clay, which effectively increases the strength of the prepared ceramsite products, and the carbon contained in coal gangue can increase heat value, and can also play the role of foaming; besides providing ceramsite oxide composition, the sludge also acts as a binder and modifier, overcoming the disadvantage of poor plasticity of glass powder as a barren material, and at the same time The combustion of the organic components in the sludge during the firing of ceramsite, on the one hand, makes full use of the calorific value in the sludge, and on the other hand plays the role of a foaming agent; and the glass powder, because of its low softening temperature, can The firing temperature of ceramsite is lowered, and the glass phase is increased at the same time so that the bubbling gas generated at the firing temperature cannot overflow, and finally bubbles are formed in the green body to reflect the light weight characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: Add coal gangue, urban domestic dry sludge, and waste glass powder into a ball mill at a weight ratio of 15:35:50 to grind until the mass percentage of the sieve residue on an 80-mesh sieve is less than 1%, and the batch material after grinding and mixing Add 24% of water to it, and then make the mud into a ball. 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 950°C ℃ heating rate 15 ℃ / min, 950 ℃ heat preservation for 20 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 546Kg / m can be obtained 3 , the cylinder compressive strength is 4.3Mpa, the water absorption rat...

example 2

[0024] Example 2: Add coal gangue, urban domestic dry sludge, and waste glass powder into a ball mill at a weight ratio of 30:50:20 to grind until the mass percentage of the 80-mesh sieve is less than 1%, and the batch after grinding and mixing Add 30% water to the clay, and then make the mud into a ball. 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 500°C, heating rate 20°C / min, 500°C for 30 minutes, 500°C to 1100°C ℃ heating rate 15 ℃ / min, 1100 ℃ heat preservation 8min, cooling stage 1100 ℃ ~ 700 ℃ rapid cooling, 700 ℃ ~ 500 ℃ slow cooling, rapid cooling below 500 ℃, slow cooling stage cooling rate: 10 ℃ / min, fast cooling Stage cooling rate: 20°C / min. Through the above steps, a bulk density of 517Kg / m can be obtained 3 , the cylinder compressive strength is 4.4MPa, the water absorption rate is 5%, and it is a ceramsite product that meets ...

example 3

[0025] Example 3: Add coal gangue, urban domestic dry sludge, and waste glass powder into a ball mill at a weight ratio of 45:25:30 to grind until the mass percentage of the sieve residue on an 80-mesh sieve is less than 1%, and the batch after grinding and mixing Add 20% water to the clay, and then make the mud into a ball. 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 600°C, heating rate 20°C / min, 600°C for 20 minutes, 600°C to 1050°C ℃ Heating rate 15 ℃ / min, 1050 ℃ heat preservation 15min, cooling stage 1050 ℃ ~ 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 563Kg / m can be obtained 3 , Cylinder compressive strength 4.7Mpa, water absorption rate 3.5%, ceramsite products in line with national ...

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Abstract

A process for preparing baking ceramsite from solid waste belongs to the field of architectural materials. The invention bakes ceramsite products with high property by employing coal gangue, sludge and waste glass powder as raw materials. Components percentage by weight in the formula comprise the coal gangue of 15-45%, urban domestic dry sludge of 25%-50% and waste glass powder of 20%-50%. Ceramsite green-ware prepared according to the formula are heat-insulated at a temperature of 300DEG C-600DEG C for 20-50 minutes after being dried and carbon discharging is carried out, and then baked at a temperature of 950DEG C-1100DEG C for 8-20 minutes to obtain the ceramsite products, 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 light-weight high-strength ceramsite by using coal gangue, sludge and waste glass powder, belonging to the technical field of building materials. Background technique [0002] Coal gangue is the solid waste with the largest discharge in my country at present, and its output accounts for 15% to 20% of the total output of raw coal. At present, my country has accumulated 5 billion tons, and the annual discharge is growing rapidly at a rate of 150 million tons. my country's annual dry sludge production is about 500,000 tons, which is currently mainly landfilled. The stacking and landfilling of coal gangue and sludge not only occupies a large amount of land, but also causes huge environmental pollution, which is in urgent need of harmless treatment. As a building material, ceramsite can consume a large amount of non-degradable inorganic non-metallic solid wastes, and provides an effective means to dea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/32C04B33/132C04B33/16
CPCY02P40/60
Inventor 严建华王亚丽王峰崔素萍兰明章王子明李智丰
Owner BEIJING UNIV OF TECH
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