Method for synthesizing ceramsite by coal slurry, ardealite and metallurgical slag

A technology of metallurgical waste slag and phosphogypsum, which is applied in applications, household appliances, and other household appliances. It can solve the problems of mixing and preparing ceramsite that have not been seen before, and achieve the effects of shortening roasting time, large specific surface area, and improving combustion efficiency.

Inactive Publication Date: 2010-12-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the raw materials used in the published methods for making ceramsite are mostly fly ash, sludge, clay, etc., and there is no ...

Method used

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  • Method for synthesizing ceramsite by coal slurry, ardealite and metallurgical slag

Examples

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Embodiment 1

[0018] Grind coal slime, phosphogypsum, and metallurgical waste slag into powders with a particle size of 120-180 μm at a ratio of 50%: 10%: 40% by mass, add 3% of the raw material weight to mix, and put them on a YK-60 granulator Make balls with a particle size of 5-10mm. During the heating and roasting process, the temperature in the drying stage is controlled at 105±2°C, and dried for 1h; the temperature is raised to 450°C at a rate of 10°C / min, and preheated for 25min; Entering the roasting stage, the temperature is raised to 800°C at a heating rate of 15°C / min, and roasted for 25 minutes; finally, the finished product is obtained by natural cooling. The water absorption rate of the produced ceramsite is ≤15%, the bulk density range is ≤500kg / m3, and the cylinder compressive strength is ≥0.3MPa.

Embodiment 2

[0020] Grind coal slime, phosphogypsum, and metallurgical waste slag into powders with a particle size of 120-180 μm in a mass percentage of 70%:5%:25%, add water accounting for 4% of the raw material weight, and mix them on a YK-60 granulator Make balls with a particle size of 10-20mm, control the temperature in the drying stage at 105±2°C, dry for 1.5h; increase the temperature to 550°C at a rate of 10°C / min, and preheat for 18 minutes; Heating rate The temperature is raised to 950°C, roasted for 10 minutes, and finally cooled naturally to obtain the finished product. The water absorption rate of the produced ceramsite is ≤15%, and the bulk density range is ≤500kg / m 3 , Cylinder compressive strength ≥ 0.3MPa.

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Abstract

The invention relates to a method for synthesizing ceramsite by coal slurry, ardealite and metallurgical slag. The method comprises the following steps of: mixing the coal slurry serving as a main raw material and the ardealite and the metallurgical slag serving as auxiliary materials; pelletizing the mixture; baking the particles; and naturally cooling the baked particles to the room temperature to obtain the ceramsite. The water absorption rate of the finished ceramsite is less than or equal to 15 percent, the bulk density range is less than or equal to 500 kg/m<3> and the cylinder compressive strength is more than or equal to 0.3 MPa. The technical index of the ceramsite can reach the standard of GBT17431.1-1998 Lightweight Aggregates and Its Test Methods.

Description

1. Technical field [0001] The invention relates to a method for synthesizing ceramsite from solid waste by utilizing coal slime, phosphogypsum and metallurgical waste residue, and belongs to the field of harmless and resourceful solid waste. 2. Technical background [0002] At present, the accumulation of solid waste in my country has reached 6.7 billion tons, and it is increasing at a rate of 800 million tons / a, covering an area of ​​654.12 million m 2 , generally use landfill or open-air stacking, which has caused serious environmental pollution. Facing the increasingly severe resource situation in our country, how to use existing technologies to realize the reduction, harmlessness and even resource utilization of solid waste has gradually become an academic research hotspots. Coal slime, which generally refers to the semi-solid formed by the water content of coal powder, is a product in the coal production process. Due to its many disadvantages such as high moisture, hig...

Claims

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Application Information

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IPC IPC(8): C04B33/138
CPCY02P40/60
Inventor 马丽萍杨稔闫贝陈宇航
Owner KUNMING UNIV OF SCI & TECH
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