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Method for producing baked brick by using rare-earth metal modified coal gangue

A technology of rare earth metals and coal gangue, which is applied in the field of chemical engineering to treat solid waste, can solve problems that have not been solved well, and achieve the effects of reducing calcination temperature, improving performance, and huge market capacity

Inactive Publication Date: 2012-10-03
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of resource utilization of coal gangue has not been well resolved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The main chemical composition mass percent of coal gangue is: C 8.6%, Al 2 o 3 18.19%, SiO 2 60.5%, Fe 2 o 3 8.32%, CaO 1.31%, MgO 0.48%, TiO 2 1.1%, K 2 O and Na 2 O 1.5%; the mass percentage of the chemical composition of the clay is: SiO 2 50.5%, Fe 2 o 3 10.9%, Al 2 o 3 36.7%, TiO 2 1.9%, and its plasticity index is 22; the rare earth metal lanthanum is a powder product with a rare earth metal content ≥ 99.9wt%; the raw material coal gangue, clay and lanthanum are dried at 100°C for 3.5 hours, and ground to a particle size by a ball mill ≤76μm accounts for more than 95%, and the pulverized coal gangue, clay and rare earth metal lanthanum are evenly mixed in a weight ratio of 100:18.75:1.44, and continuously stirred for 25 minutes to obtain a uniformly mixed powder; Add water at a ratio of 7.8% of the raw material, age at 35°C for 72 hours, and then send it to a twin-shaft mixer for stirring. During the stirring process, add water at ...

Embodiment 2

[0021] Embodiment 2: the main chemical composition mass percent of coal gangue is: C 7.3%, Al 2 o 3 20.2%, SiO 2 62.85%, Fe 2 o 3 5.31%, CaO 1.02%, MgO 0.51%, TiO 2 1.1%, K 2 O and Na 2 O 1.71%; the mass percentage of the chemical composition of the clay is: SiO 2 52.8%, Fe 2 o 3 6.1%, Al 2 o 3 38.7%, TiO 22.4%, and its plasticity index is 22; Rare earth metal cerium is a powdered product with rare earth metal content ≥ 99.9wt%; the raw material coal gangue, clay and rare earth metal are respectively dried at 105°C for 3 hours, and ground to Particle size ≤ 76 μm accounts for more than 95%, and the pulverized coal gangue, clay and lanthanum are uniformly mixed in a weight ratio of 100:10.94:0.67, and continuously stirred for 28 minutes to obtain a uniformly mixed powder; Add water at a ratio of 7.8%, age at 30°C for 80 hours, then send it to a twin-shaft mixer for stirring, add water at a temperature of 38°C during the stirring process, and control the moistu...

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PUM

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Abstract

The invention relates to a method for producing a baked brick by using a rare-earth metal modified coal gangue. The method comprises the following steps of: crushing the coal gangue to pelletize with clay and rare-earth metal; feeding the granules into a blender to uniformly blend and mix by adding water; then feeding the mixture into a brick machine for performing compression molding; and finally putting the mixture into a sintering kiln for sintering into a finished product so as to obtain a common baked brick which accords with GB5101-2003 and can be directly used as a building material.

Description

technical field [0001] The invention relates to a method for producing sintered bricks from coal gangue modified with rare earth metals, and belongs to the technical field of chemical engineering solid waste treatment. Background technique [0002] my country is a country where coal is the main energy source. Its coal reserves rank among the top in the world, and its annual output ranks first in the world. Coal gangue is a mixture of gangue flakes, ore seams, and sediment with low coal content that are mined together with coal during coal mining. The domestic stockpile quantity has reached about 3 billion tons, covering an area of ​​110 million m 2 , The country's coal mines add more than 100 million tons every year. Such a large amount of coal gangue is mostly stacked in the open air. After being exposed to the sun, rain, weathering, and decomposition, a large amount of acidic water or water carrying metal ions is produced, which infiltrates and damages the quality of grou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/14C04B35/622B09B3/00
Inventor 马林转宁平卿山王红斌刘天成
Owner YUNNAN MINZU UNIV