CN1609040A - Mullite material synthesizing process - Google Patents

Mullite material synthesizing process Download PDF

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Publication number
CN1609040A
CN1609040A CNA2004100610297A CN200410061029A CN1609040A CN 1609040 A CN1609040 A CN 1609040A CN A2004100610297 A CNA2004100610297 A CN A2004100610297A CN 200410061029 A CN200410061029 A CN 200410061029A CN 1609040 A CN1609040 A CN 1609040A
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China
Prior art keywords
mullite
synthetic method
mullite material
material according
base substrate
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CNA2004100610297A
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Chinese (zh)
Inventor
阮玉忠
于岩
吴敏生
吴任平
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Fuzhou University
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Fuzhou University
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Priority to CNA2004100610297A priority Critical patent/CN1609040A/en
Publication of CN1609040A publication Critical patent/CN1609040A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Compositions Of Oxide Ceramics (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)

Abstract

The present invention is mullite material synthesizing process. Industrial sludge from aluminum section plant and silica fume dust from ferroalloy plant as material are processed through grinding, dewatering, vacuum mixing and extruding to form strip blank; and the strip blank is stoved, calcined, cooled naturally, crushed and ground to form the mullite material product. The present invention uses two kinds of waste and the mullite material product has mullite content over 95 %. The present invention has the advantages of low cost, fast reaction speed and high mullite content in the product.

Description

The synthetic method of mullite material
Technical field:
The present invention relates to ecological environment material nd, belong to the comprehensive utilization of solid waste, refer to a kind of synthetic method of mullite material especially.
Background technology:
Mullite is a kind of special refractories, premium propertiess such as it has refractoriness height, good thermal shock, chemical resistance of concrete, creep resistance, loading texturing temperature height, volume stability is good, electrical insulating property is strong are widely as the high quality raw material of special refractories, high-quality light heat insulation material, electroceramics and mullite fiber.Conventional synthetic method is with commercial alumina, and clay etc. are raw material, and is synthetic 1650-1700 ℃ of calcining.This method is being lower than 1500 ℃ of calcinings when synthetic, and mullite content is lower than 85%, and ordinary method needs the calcining temperature height, and mullite is difficult to reach more than 95% in the synthetic material, and synthetic cost height.
Summary of the invention:
The invention solves in the product existing in prior technology low, the synthetic defect of high cost of mullite content, provide that a kind of raw materials cost is low, the synthetic method of the simple mullite material of synthesis technique.
Technical scheme of the present invention is as follows: raw material of the present invention comprises waste aluminum sludge and ferroalloy plant silica fume, two kinds of raw materials are even through wet-mixed, in grinding in ball grinder, abrasive passes through dehydration, vacuum pugging, pushes, is shaped to the base substrate of strip.Strip base substrate drying, the oven dry base substrate naturally cools to room temperature after placing the High Temperature Furnaces Heating Apparatus calcining, is the mullite synthesizing grog of strip.Synthetic grog is through fragmentation and the product that grinds to form mullite synthesizing.
The present invention is the raw material synthesizing mullite material with the fine silicon powder that waste aluminum sludge and ferroalloy works reclaim, and belongs to two useless comprehensive utilizations of solid and the project that turns waste into wealth.Because two kinds the raw material particle is ultra-fine, specific surface area big, active height, helps solid state reaction and forms mullite.This mullite synthesizing content can reach more than 95%.So synthetic method of the present invention is better than conventional synthetic method, its advantage is: 1, the raw material particle is ultra-fine, reduces the processing charges of raw material.2, raw materials cost is low.3, remarkable in economical benefits has the very strong market competitiveness.4, the solid state reaction impellent is big, and speed of response is fast, helps mullite and forms mullite synthesizing content height.Wherein waste aluminum sludge is that aluminium section bar plant surface treatment (anodic oxidation, alkaline process and acid system) process produces a large amount of waste liquids, the solid mud that waste liquid produces through comprehensive treating process, and its main component is γ-AlOOH, Al (OH) 3, wherein part is a crystal, and part is an amorphous body, and particle is ultra-fine, is approximately between the 0.1-1 μ m, and particle surface is long-pending big, active high, helps solid state reaction and forms mullite.Ferroalloy plant silica fume is that electric furnace produces volume of smoke in the ferrosilicon production process, reclaims the dust that obtains through bag filter, and its main ingredient is SiO 2, belonging to the solid dust of amorphous body structure, particle dia is less than 0.6 μ m, and surface-area is big, and activity is very high, helps solid state reaction and forms mullite.
Embodiment:
Synthetic method of the present invention is as follows:
(1) raw material and prescription: with waste aluminum sludge and ferroalloy plant silica fume is raw material synthesis of high purity mullite material.Aluminium manufacturer's industrial sludge chemical constitution (weight percentage): SiO 2Be 2.34%, Al 2O 3Be 61.16%, Fe 2O 3Be 0.27%, CaO is 0.48%, MgO is 0.37%, K 2O is 0.03%, Na 2O is 0.30%, loss on ignition is 34.46%; Ferroalloy plant silica fume chemical constitution: SiO 2Be 91.94%, Al 2O 3Be 2.06%, Fe 2O 3Be 1.65%, K 2O is 0.90%, Na 2O is 0.30%, other are 3.20%.
The prescription of synthesizing mullite material (weight percentage):
Waste aluminum sludge: 78%-83%
Ferroalloy plant silica fume: 17-22%
Aluminum oxide and silicon-dioxide ratio, i.e. Al in the prescription 2O 3/ SiO 2Ratio is 2.30-2.80.Waste aluminum sludge is mainly γ-AlOOH, Al (OH) 3With amorphous body structure solid matter, particle is between 0.1-1 μ m; And ferroalloy plant silica fume belongs to amorphous body structure solid dust, and particle is less than 0.6 μ m.Both particles are ultra-fine, and are active high.
(2) grind: two kinds of raw materials must be even through wet-mixed, in ball milling, ground 4 hours, and, material: ball: water=1: 2: 1.
(3) dehydration: abrasive is 15-20% through the filter-press dehydration controlling moisture content.
(4) moulding: grind the dehydration raw material through vacuum pugging, push, be shaped to the base substrate of strip.
(5) oven dry: the strip base substrate is through 80-100 ℃ of oven dry, and controlling moisture content is 0.5-1%.
(6) calcining: the oven dry base substrate places the High Temperature Furnaces Heating Apparatus calcining: calcining temperature is controlled to be 1450-1550 ℃, after the calcining soaking time is 2-5h.
(7) cooling: naturally cool to room temperature, be the mullite synthesizing grog of strip.
(8) broken, grind: synthetic grog is through broken and grind to form the product of mullite synthesizing: coarsness is the 8-20 order, and fine granularity is the 180-320 order.Mullite content is 85-98% in the synthetic material product, aluminum oxide 0-12%, quartzy 3-5%.
Embodiment 1
With waste aluminum sludge and ferroalloy plant silica fume is raw material, and its prescription is as follows:
Waste aluminum sludge: 81%
Ferroalloy plant silica fume: 19%
Two kinds of raw materials are through mixing wet grinding, and abrasive dewaters after filtration, and controlling moisture content is 15-20%, abrasive through vacuum pugging, is squeezed into the strip base substrate, base substrate through 80 ℃ the oven dry 12 hours after, controlling moisture content is 1%, to dry base substrate and place 1450 ℃ of calcinings of High Temperature Furnaces Heating Apparatus, the calcining soaking time is 5h, naturally cools to room temperature then, synthetic material is through broken and grinding,, classification forms 8-20 order coarse fodder and 180-320 purpose fines.Through the XRD analysis result, form three crystalline phases: mullite, α-Al 2O 3And SiO 2, mullite content is 85%, a-Al 2O 3Be 11%, quartz is 4%.
Embodiment 2
With waste aluminum sludge and ferroalloy plant silica fume is raw material, changes prescription, and calcining temperature is identical with embodiment 1 with the calcining soaking time.
Prescription:
Waste aluminum sludge: 79%
Ferroalloy plant silica fume: 21%
Processing condition:
Calcining temperature: 1450 ℃
Calcining soaking time: 5 hours
Other synthesis technique is identical with embodiment 1, and synthetic material forms two crystalline phases through the XRD analysis result: mullite and quartz, and wherein mullite is 96%, quartz is 4%.
Embodiment 3:
With waste aluminum sludge and ferroalloy plant silica fume is raw material, and prescription is identical with embodiment 2 with the calcining soaking time, changes calcining temperature.
Prescription:
Waste aluminum sludge: 79%
Ferroalloy plant silica fume: 21%
Processing condition:
Calcining temperature: 1400 ℃
Calcining soaking time: 5 hours
Other synthesis technique is identical with embodiment 1, and synthetic material forms two crystalline phases: mullite and α-Al through the XRD analysis result 2O 3, wherein mullite is 93.9%, α-Al 2O 3Be 6.1%.
Embodiment 4:
With waste aluminum sludge and ferroalloy plant silica fume is raw material, and prescription is identical with embodiment 2 with calcining temperature, changes the calcining soaking time.
Prescription:
Waste aluminum sludge: 79%
Ferroalloy plant silica fume: 21%
Processing condition:
Calcining temperature: 1450 ℃
Calcining soaking time: 4 hours
Other synthesis technique is identical with embodiment 1, and synthetic material forms two crystalline phases: mullite and α-Al through the XRD analysis result 2O 3, wherein mullite is 93.4%, α-Al 2O 3Be 6.6%.

Claims (10)

1, a kind of synthetic method of mullite material is characterized in that: the raw material that it adopts comprises waste aluminum sludge and ferroalloy plant silica fume; Two kinds of raw materials are even through wet-mixed, in grinding in ball grinder; Abrasive passes through dehydration, vacuum pugging, pushes, is shaped to the base substrate of strip; Strip base substrate drying; The oven dry base substrate naturally cools to room temperature after placing the High Temperature Furnaces Heating Apparatus calcining, again through broken and grinding.
2, the synthetic method of mullite material according to claim 1 is characterized in that: the prescription of synthesizing mullite material (weight percentage):
Waste aluminum sludge: 78%-83%
Ferroalloy plant silica fume: 17-22%
Aluminum oxide and silicon-dioxide ratio are in the prescription: Al 2O 3/ SiO 2=2.30-2.80.
3, the synthetic method of mullite material according to claim 1 and 2 is characterized in that: two kinds of raw materials must be even through wet-mixed, ground 4 hours material: ball: water=1: 2: 1 in ball milling.
4, the synthetic method of mullite material according to claim 3 is characterized in that: abrasive is through filter-press dehydration, and controlling moisture content is 15-20%.
5, the synthetic method of mullite material according to claim 4 is characterized in that: grind the dehydration raw material through vacuum pugging, push, be shaped to the base substrate of strip.
6, the synthetic method of mullite material according to claim 5 is characterized in that: the strip base substrate is through 80-100 ℃ of oven dry, and controlling moisture content is 0.5-1%.
7, the synthetic method of mullite material according to claim 6 is characterized in that: the oven dry base substrate places the High Temperature Furnaces Heating Apparatus calcining: calcining temperature is controlled to be 1450-1550 ℃, after the calcining soaking time is 2-5h.
8, the synthetic method of mullite material according to claim 7 is characterized in that: the idiosome after will calcining naturally cools to room temperature.
9, the synthetic method of mullite material according to claim 8 is characterized in that: will synthesize grog broken is the 8-20 order with grinding to form coarsness, or fine granularity is the 180-320 order
10, a kind of mullite material is characterized in that: it comprises mullite 85-98%, aluminum oxide 0-12%, quartzy 3-5%.
CNA2004100610297A 2004-10-29 2004-10-29 Mullite material synthesizing process Pending CN1609040A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CNA2004100610297A CN1609040A (en) 2004-10-29 2004-10-29 Mullite material synthesizing process

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101913889A (en) * 2010-08-27 2010-12-15 厦门大学 Method for preparing mullite refractory material from aluminum plant sludge and pyrophyllite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101913889A (en) * 2010-08-27 2010-12-15 厦门大学 Method for preparing mullite refractory material from aluminum plant sludge and pyrophyllite
CN101913889B (en) * 2010-08-27 2013-05-08 厦门大学 Method for preparing mullite refractory material from aluminum plant sludge and pyrophyllite

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