Method for preparing lightweight high-strength ceramsite by aid of coal gangue

A technology of high-strength ceramsite and coal gangue, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of high cost of alumina chopped fibers, complicated preparation technology, etc., and can achieve cylinder compressive strength Improved, broad application prospects, low density effect

Pending Publication Date: 2017-07-21
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN 201210201367.0 uses coal gangue, alumina powder, barium carbonate and alumina chopped fibers as raw materials to prepare high-performance ceramsite materials, but the cost of alumina chopped fibers used in this technology is relatively high and the preparation technology is complicated;

Method used

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  • Method for preparing lightweight high-strength ceramsite by aid of coal gangue
  • Method for preparing lightweight high-strength ceramsite by aid of coal gangue
  • Method for preparing lightweight high-strength ceramsite by aid of coal gangue

Examples

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Effect test

Embodiment 1

[0031] A method for preparing lightweight high-strength ceramsite from coal gangue, comprising the steps of:

[0032] 1) Calcining coal gangue with a carbon content of 20% at 800°C to obtain coal gangue with a carbon content of about 7% and an aluminum oxide content of 40%, and the coal gangue block is obtained by crushing and grinding Powder with a particle size of 400 mesh;

[0033] 2) By mass percentage, 69% coal gangue powder, 14% bauxite (65% aluminum oxide content), 5% calcium carbonate (2% calcium oxide is formed after calcining), and 12% potassium Mix evenly to obtain raw materials;

[0034] 3) Put the raw materials in a ball mill, add high alumina balls according to the ball-to-material ratio of 1:1, and after ball milling for 1 hour, take out the mixed powder through a 600-mesh standard sieve;

[0035] 4) Put the mixed powder in a high-speed stirring mixing granulator, spray water accounting for 15% of the total mass of the powder at one time during the high-speed ...

Embodiment 2

[0041] A method for preparing lightweight high-strength ceramsite from coal gangue, comprising the steps of:

[0042] 1) The coal gangue with a carbon content of 15% and an aluminum oxide content of 30% is crushed and ground to obtain powder with a particle size of 400 mesh;

[0043] 2) 80% coal gangue powder, 10% calcite (5% calcium oxide is formed after calcining), and 10% potassium are mixed evenly by mass percentage to obtain raw materials;

[0044] 3) Put the raw materials in a ball mill, add high alumina balls according to the ball-to-material ratio of 1:1, and after ball milling for 1 hour, take out the mixed powder through a 500-mesh standard sieve;

[0045] 4) Put the mixed powder in a high-speed stirring mixing granulator, spray water accounting for 10% of the total mass of the powder during the high-speed stirring and rotating process of the powder, and stir at a high speed for 15 minutes to form fine and dense particles;

[0046] 5) adding 15% mixed powder to the pa...

Embodiment 3

[0051] A method for preparing lightweight high-strength ceramsite from coal gangue, comprising the steps of:

[0052] 1) The coal gangue with a carbon content of 5% and an aluminum oxide content of 50% is crushed and ground to obtain powder with a particle size of 600 mesh;

[0053] 2) Mix 50% coal gangue powder, 40% bauxite (70% aluminum oxide content), 4% calcium oxide, and 6% potassium by mass percentage to obtain raw materials;

[0054] 3) Put the raw materials in a ball mill, add high alumina balls according to the ball-to-material ratio of 1:1, and after ball milling for 2 hours, take out the mixed powder through a 500-mesh standard sieve;

[0055] 4) Place the mixed powder in a high-speed stirring mixing granulator, spray water accounting for 18% of the total mass of the powder during the high-speed stirring and rotating process of the powder, and stir at a high speed for 10 minutes to form fine and dense particles;

[0056] 5) Add 10% mixed powder to the disc molding ...

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Abstract

The invention discloses a method for preparing lightweight high-strength ceramsite by the aid of coal gangue. The method includes steps of crushing and grinding the coal gangue with the carbon content of 5-15% to obtain coal gangue powder which can completely pass 325-mesh sieves; uniformly mixing, by weight, 40%-80% of coal gangue powder, 0%-45% of bauxite powder, 1%-9% of calcium oxide and 5%-15% of potassium feldspar with one another to obtain raw materials; carrying out ball-milling on the raw materials, then granulating the raw materials in a granulator, mixing the raw materials which are subjected to ball-milling with one another and molding, drying and screening the raw materials on a ceramsite molding machine to obtain ceramsite green bodies; heating and calcining the ceramsite green bodies thrice and cooling the ceramsite green bodies with furnaces to obtain the lightweight high-strength ceramsite. The method has the advantages that the coal gangue content can reach 40%-80%, the bulk density of the lightweight high-strength ceramsite prepared by the aid of the method ranges from 0.6 g/cm<3> to 1.55 g/cm<3>, and the strength of the lightweight high-strength ceramsite is improved by 10%-15% as compared with the prior art under the condition of identical density; requirements on ceramsite propping agent materials for building light aggregate and oil and gas exploitation can be met.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a technology for preparing low-density and high-strength ceramsite materials from coal gangue. Background technique [0002] Coal gangue is the largest industrial waste in my country, and the accumulated coal gangue is more than 1 billion tons. Its stacking not only occupies land, pollutes the atmosphere, farmland and water bodies, but also has hidden dangers of fire, collapse in the rainy season, and silted rivers causing disasters. How to comprehensively utilize coal gangue is also an urgent problem to be solved. [0003] Ceramsite is generally made of clay, rock and soil and other mineral resources, fly ash, sludge, bottom mud, garbage and other waste residues and waste liquids as the main raw materials through processing, granulation and firing. Ceramsite has excellent properties incomparable to other materials, such as low density, light weight, high comprehensive strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/626C09K8/80
CPCC09K8/80C04B35/10C04B35/62204C04B35/6261C04B35/62615C04B35/62645C04B35/62695C04B2235/3208C04B2235/3472C04B2235/6567C04B2235/6562C04B2235/77C04B2235/96
Inventor 吴赟石飞飞夏晓禄王志峰王卫东李昌原刘辉
Owner TIANJIN CHENGJIAN UNIV
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