Method for preparing mullite refractory material from aluminum plant sludge and pyrophyllite

A technology of aluminum factory sludge and refractory materials, which is applied in the field of refractory materials, can solve the problems of performance impact, large body shrinkage, etc., and achieve the effects of excellent performance, low cost and convenient operation

Inactive Publication Date: 2013-05-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of more solvents and binders in plastic molding, the green body shrinks greatly during firing, and its performance is affected

Method used

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  • Method for preparing mullite refractory material from aluminum plant sludge and pyrophyllite
  • Method for preparing mullite refractory material from aluminum plant sludge and pyrophyllite
  • Method for preparing mullite refractory material from aluminum plant sludge and pyrophyllite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Take the dry sludge provided by Nanping Aluminum Plant in Fujian Province and pyrophyllite from Minhou, Fuzhou as examples. Al in aluminum plant sludge 2 o 3 Content is 6116%, SiO 2 The content is 2.34%, the loss on ignition is 34.26%, and the Al in pyrophyllite 2 o 3 Content is 16.93%, SiO 2 The content is 78.41%, the main mineral composition is pyrophyllite and a small amount of quartz and kaolinite.

[0037] 2. Send the aluminum plant sludge and pyrophyllite to the ball mill for dry grinding. The input particle size of aluminum plant sludge is controlled within 1 mm, and the output particle size is controlled within 3 μm; the input particle size of pyrophyllite is controlled within 10 mm, and the output particle size is controlled within 5 μm.

[0038] 3. Send the dry-milled aluminum plant sludge and pyrophyllite into a ball mill, add water for wet grinding, and obtain aluminum plant sludge-pyrophyllite mixed slurry. According to the mass ratio, aluminum pl...

Embodiment 2

[0045] Raw material and technological process are with embodiment 1. Aluminum plant sludge: pyrophyllite is 3:1, at this time Al 2 o 3 with SiO 2 The ratio of the mass percent content is 2.35. The size of the pressed green body is 5mm×4mm×50mm, and the molding pressure is 135MPa; the pressurization speed is controlled as: 5MPa / s when 0-50MPa; 10MPa / s when 50-100MPa; 5MPa / s when 100-135MPa s; holding time is 10s. The sintering temperature is 1550°C; the heating rate of the sintering process is controlled as follows: from room temperature to 900°C, 10°C / min; from 900 to 1200°C, 5°C / min; from 1200 to 1550°C, 3°C / min; the sintering time is 4h. The obtained sample forms three crystal phases, which are mullite, Al 2 o 3 , SiO 2 . Among them, the content of mullite is 93.3%, Al 2 o 3 content of 6.1%, SiO 2 The content is 0.6%. The flexural strength of the sample is 22.17MPa, the primary thermal shock retention rate is 77.9%, the refractoriness is 1650°C, and the bulk den...

Embodiment 3

[0047] Raw material and technological process are with embodiment 1. Aluminum plant sludge: pyrophyllite is 3.55:1, at this time Al 2 o 3 with SiO 2 The ratio of the mass percent content is 2.70. The size of the pressed green body is 300mm×300mm×30mm, and the molding pressure is 150MPa; the pressurization speed is controlled as: 3MPa / s when 0-50MPa; 5MPa / s when 50-100MPa; 3MPa / s when 100-150MPa s; holding time is 45s. The sintering temperature is 1500°C; the heating rate of the sintering process is controlled as follows: from room temperature to 900°C, 10°C / min; from 900 to 1200°C, 5°C / min; from 1200 to 1500°C, 3°C / min; the sintering time is 6h. The obtained sample forms three crystal phases, which are mullite, Al 2 o 3 , SiO 2 . Among them, the content of mullite is 94.2%, Al 2 o 3 Content is 5.2%, SiO 2 The content is 0.6%. The flexural strength of the sample is 21.53MPa, the primary thermal shock retention rate is 82.6%, the refractoriness is 1600°C, and the bu...

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Abstract

The invention discloses a method for preparing a mullite refractory material from aluminum plant sludge and pyrophyllite, which relates to a refractory material. The method has a simple process and low cost and comprehensively uses solid wastes. The method comprises the following steps of: dryly milling the aluminum plant sludge and the pyrophyllite in a ball mill respectively; adding water into the ball mill and wetly milling the aluminum plant sludge and the pyrophyllite in the ball mill to obtain aluminum plant sludge-pyrophyllite mixed slurry; spraying the aluminum plant sludge-pyrophyllite mixed slurry into a prilling tower by using a sprayer for pulverization and drying to obtain aluminum plant sludge-pyrophyllite aggregates; molding the aluminum plant sludge-pyrophyllite aggregatesin a hydraulic molding machine to obtain an aluminum plant sludge-pyrophyllite blank; drying the aluminum plant sludge-pyrophyllite blank to reduce sintering shrinkage and prevent sample cracking; and sintering the aluminum plant sludge-pyrophyllite blank and then cooling the sintered product to room temperature to obtain the mullite refractory material.

Description

technical field [0001] The invention relates to a refractory material, in particular to a method for preparing a mullite refractory material by using aluminum plant sludge and pyrophyllite. Background technique [0002] With the rapid development of aluminum alloy building materials, a large number of aluminum alloy materials have been put into various fields of production and life. In order to meet the needs of customers, aluminum alloy products generally need to undergo surface treatment to improve the corrosion resistance and wear resistance of aluminum profiles, and finally achieve the purpose of improving the surface quality of aluminum profiles. In the degreasing, alkali washing, neutralization, anodic oxidation and other processes of surface treatment of aluminum profiles, a large amount of aging and invalid waste liquid is produced. In order to avoid environmental pollution caused by direct discharge, the manufacturer filters the waste liquid after flocculation and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 罗学涛傅翠梨许庆水李锦堂
Owner XIAMEN UNIV
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