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Silica sand tailings and coal gangue-based foamed ceramic and preparation method thereof

A technology of foam ceramics and coal gangue, which is applied in the field of silica sand mine tailings and coal gangue-based foam ceramics and their preparation, can solve problems such as complex preparation processes, achieve good overall performance, reduce maintenance costs, and improve strength

Inactive Publication Date: 2015-04-08
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A Chinese patent with the publication number CN102674788A discloses a coal gangue building board and its preparation method. The patent mainly uses coal gangue to prepare a lightweight, fireproof, and heat-retaining coal gangue building board. After secondary sintering, gangue pottery is prepared. After sanding, coal gangue pottery sand is bonded into plates with a large amount of adhesives. The preparation process is more complicated and does not involve the utilization of silica sand or quartz sand tailings.

Method used

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  • Silica sand tailings and coal gangue-based foamed ceramic and preparation method thereof
  • Silica sand tailings and coal gangue-based foamed ceramic and preparation method thereof
  • Silica sand tailings and coal gangue-based foamed ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw materials of foam ceramics are mainly composed of 55% of quartz sand (silica sand) mine tailings, 25% of coal gangue, and 20% of sintering aids, of which borax (also known as sodium tetraborate) is 10% in sintering aids, and water glass is 5%. And calcium carbonate is 5% mixture, all are mass percentages.

[0038] Put the raw materials into a ball mill for ball milling, dry and sieve, take 100-300 mesh powder, mix them evenly, put them in a mold and press them for molding, the molding pressure is 10MPa, dry the formed green body, put it into a sintering furnace for sintering , wherein the heating rate is 5°C / min, the sintering temperature is 1100°C, and the temperature is kept for 1 hour.

[0039] The porosity of the prepared ceramic foam is 61.6%, and the bulk density is 0.74g / cm 3 , Bending strength 6.2MPa, compressive strength 15.2MPa, acid resistance 98.3%, alkali resistance 99.4%.

Embodiment 2

[0041] The main composition of foam ceramics is: SiO 2 67.5%, Al 2 o 3 17.5%, WO 3 1.35%, Fe 2 o 3 0.65%, Na 2 O 3.5%, B 2 o 3 5%, CaO 5%. SiO 2 50%, Al 2 o 3 35%, WO 3 1%, Fe 2 o 3 1%, Na 2 O 3.5%, B 2 o 3 5%, CaO 4.5%.

[0042] The raw material composition is: 50% of quartz sand (silica sand) mine tailings, 30% of coal gangue, 20% of sintering aids, of which 10% of borax (also known as sodium tetraborate) in sintering aids, 2.5% of water glass and calcium carbonate It is a mixture of 7.5%, both are mass percentages.

[0043] Put the raw materials into a ball mill for ball milling, dry and sieve, take 100-300 mesh powder, mix them evenly, put them in a mold and press them for molding, the molding pressure is 15MPa, fully dry the formed body, and put it into a sintering furnace Sintering, wherein the heating rate is 3°C / min, the sintering temperature is 1120°C, and the temperature is kept for 2 hours.

[0044] The porosity of the prepared ceramic foam is 71...

Embodiment 3

[0046] The main composition of foam ceramics is: SiO 2 61.5%, Al 2 o 3 25%, WO 3 1.25%, Fe 2 o 3 0.75%, Na 2 O 3%, B 2 o 3 4%, CaO 4.5%. SiO 2 50%, Al 2 o 3 35%, WO 3 1%, Fe 2 o 3 1%, Na 2 O 3.5%, B 2 o 3 5%, CaO 4.5%.

[0047] The raw material composition is: 42.5% of quartz sand (silica sand) mine tailings, 42.5% of coal gangue, 15% of sintering aids, of which 5% of borax (also known as sodium tetraborate) in sintering aids, 5% of water glass and calcium carbonate For 5% mixtures, all are percentages by mass.

[0048] Put the raw materials into a ball mill for ball milling, sieve, take 100-300 mesh powder, mix them evenly, put them in a mold and press them for molding, the molding pressure is 10MPa, fully dry the formed body, put it into a sintering furnace for sintering, The heating rate is 5°C / min, the sintering temperature is 1160°C, and the temperature is kept for 4 hours.

[0049] The porosity of the prepared ceramic foam is 68.54%, and the bulk dens...

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Abstract

The invention discloses silica sand tailings and coal gangue-based foamed ceramic and a preparation method thereof. The foamed ceramic is prepared from quartz sand ore tailings and / or silica sand tailings, coal gangue and a sintering additive in blank forming and sintering manners. The preparation method is simple in preparation process, mild in reaction condition, and low in raw material cost; the prepared foamed ceramic has the characteristics of high strength, high porosity, low cost, no secondary pollution and the like; and the specific characteristics are as follows: the utilization rate of solid waste materials can be up to 85%; the volume density of the foamed ceramic is 0.37-0.74g / cm<3>; the porosity is 61.6%-87.5%; the bending strength is 2.1-6.2MPa; the compressive strength is 6.1-15.2MPa; the acid resistance is 98.3%-98.9%; and the alkali resistance is 99.1%-99.4%.

Description

technical field [0001] The invention relates to silica sand mine tailings or quartz sand mine tailings and coal gangue as main raw materials and a preparation method thereof, which belongs to the technical field of ceramic materials. Background technique [0002] Silica sand or quartz sand tailings are mainly waste residues in ore mining, tailings and tailings in processing, of which tailings account for the vast majority. Tailings are mainly crystalline quartz aggregates with finer grain size, and the chemical composition is mainly SiO 2 , The impurity minerals are mainly clay, feldspar, mica, iron minerals, etc., and their quality varies greatly due to the quality of the raw ore and the production process. Compared with fine sand, SiO in tailings chemical composition 2 The content is obviously low, while the Al 2 o 3 , Fe 2 o 3 、TiO 2 and other impurities are generally high. [0003] With the rapid development of my country's industrialization, the demand for quart...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/622
Inventor 卢安贤贾继伟刘建斌李卓罗志伟李秀英刘涛涌候丽君
Owner CENT SOUTH UNIV
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