CN103396127B - Aluminum magnesium calcium fire-resistant clinker and preparation method thereof - Google Patents

Aluminum magnesium calcium fire-resistant clinker and preparation method thereof Download PDF

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CN103396127B
CN103396127B CN201310311218.4A CN201310311218A CN103396127B CN 103396127 B CN103396127 B CN 103396127B CN 201310311218 A CN201310311218 A CN 201310311218A CN 103396127 B CN103396127 B CN 103396127B
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ball
fire
aluminum magnesium
magnesium calcium
preparation
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CN103396127A (en
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陈敏
徐磊
王楠
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Northeastern University China
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Northeastern University China
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Abstract

The invention relates to an aluminum magnesium calcium fire-resistant clinker and a preparation method thereof, and belongs to the technical field of fire-resistant materials. The aluminum magnesium calcium fire-resistant clinker comprises the following components by weight percent: 75-90% of Al2O3, 5-15% of MgO, and 2-10% of CaO. The preparation method comprises the following steps of: (1) respectively crushing and levigating limestone, magnesite and bauxite; (2) mixing so as to prepare a mixed material; (3) putting the mixed material into a ball mill, mixing uniformly, and then moulding through pressing; (4) calcining at 1350-1400 DEG C to prepare a calcination material; (5) crushing and levigating till the particle size is less than or equal to 88 mesh, and moulding again through pressing; (6) performing secondary calcining at 1650-1700 DEG C. The aluminum magnesium calcium fire-resistant clinker and the preparation method thereof have low production cost and are applicable to large-scale popularization, the prepared product has the advantages of high density, small volume density, lower water absorption and the like, and the preparation method is beneficial to realization of light weight of the fire-resistant materials, can be used for promoting energy conservation and emission reduction, and has good application prospect.

Description

A kind of Aluminum magnesium calcium fire-resistant clinker and preparation method thereof
Technical field
The invention belongs to technical field of refractory materials, particularly a kind of Aluminum magnesium calcium fire-resistant clinker and preparation method thereof.
Background technology
Magnalium fire resistant materials, because of its good high temperature resistant, resistance to thermal shock and slag-resistant erosion performance, is widely used in the High-temp. kiln working lining of the industry such as metallurgy, cement; Due to the impact by alum clay resource problem, corundum cost of material is lasting soaring in recent years, and the production cost of magnalium fire resistant materials and price are also thereupon high year by year; On the other hand, because the true density of corundum is comparatively large, cause the volume density of magnalium fire resistant materials comparatively large, increase refractory materials weight, not only cause the accumulation of heat loss of High-temp. kiln large, also directly increase the quantity discharged of used refractory.
Wingdale is aboundresources in the world, and the unslaked lime obtained after its calcining has less theoretical density; If produce Al with unslaked lime Substitute For Partial corundum 2o 3-MgO-CaO refractory materials, not only significantly can reduce production cost, also due to the reduction of volume density, by the lightweight of refractory materials, can be conducive to reducing accumulation of heat loss, promote energy-saving and emission-reduction.
As everyone knows, current aluminum-spinel grog is synthesis material, due in magnalium fire resistant materials under the high temperature conditions the inner spinel that occurs react the Volumetric expansion caused, should not dense material be obtained; Therefore, sintered aluminium magnesia spinel refractory raw material, general two steps that adopt adopt fine aluminum alumina and activated magnesia to synthesize, and forms through high-temperature calcination.
For Al 2o 3, in building-up process, not only there is spinel reaction, also there is Al in-MgO-CaO system grog refractory 2o 3and the reaction between CaO, is difficult to obtain fine and close grog by one-step calcination method equally.
Summary of the invention
For existing Al 2o 3the resource that exists in-MgO-CaO system grog refractory technology of preparing is nervous, production cost is high, accumulation of heat loss is high and by problems such as rear quantity discharged are large, the invention provides a kind of Aluminum magnesium calcium fire-resistant clinker and preparation method thereof, by utilizing aboundresources and the less CaO Substitute For Partial corundum of theoretical density, realize " lightweight " of refractory materials, promote to reduce fireproof raw material cost and energy-saving and emission-reduction.
The composition of Aluminum magnesium calcium fire-resistant clinker of the present invention is by weight percentage containing Al 2o 375 ~ 90%, MgO5 ~ 15%, CaO 2 ~ 10%.
The volume density of above-mentioned Aluminum magnesium calcium fire-resistant clinker is 3.02 ~ 3.61g/cm 3.
The water-intake rate of above-mentioned Aluminum magnesium calcium fire-resistant clinker is 2.8 ~ 3.8%.
The preparation method of Aluminum magnesium calcium fire-resistant clinker of the present invention carries out according to the following steps:
1, Wingdale, wagnerite and bauxitic clay is broken respectively and levigate to granularity≤88 order;
2, Wingdale, wagnerite and bauxitic clay after pulverizing are mixed and made into mixture, blending ratio is by weight percentage for Wingdale accounts for 2.6 ~ 13% of whole material gross weight, wagnerite accounts for 7.6 ~ 21.6% of whole material gross weight, and bauxitic clay accounts for 66.1 ~ 84.9% of whole material gross weight;
3, mixture is placed in ball mill to mix, then makes ball at the pressure of 100 ~ 150MPa, obtain green-ball;
4, green-ball is incubated 2 ~ 4 hours under 1350 ~ 1400oC condition, carries out first time calcining, make a grog;
5, a chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 100 ~ 150MPa, obtain secondary ball material;
6, secondary ball material is incubated 4 ~ 6 hours under 1650 ~ 1700oC condition, carries out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker.
In the Wingdale adopted in aforesaid method, the weight content>=54%(CaO of CaO is mainly with CaCO 3form be present in Wingdale), Al in the bauxitic clay of employing 2o 3weight content>=75%, weight content>=46% of MgO in the wagnerite of employing.
Aluminum magnesium calcium fire-resistant clinker of the present invention and preparation method thereof utilizes Wingdale for raw material, production cost is low, suitable large-scale promotion, the product produced has that density is high and volume density is little, and accumulation of heat loss is little, and water-intake rate is less, the advantages such as quantity discharged is little, be conducive to the lightweight realizing refractory materials, promote energy-saving and emission-reduction, have a good application prospect.
Embodiment
The equipment calcining employing in the embodiment of the present invention is high temperature vertical kiln.
The equipment suppressing balling-up employing in the embodiment of the present invention is GY650-180 type ball press.
Embodiment 1
The weight content 54.2% of CaO in the Wingdale adopted, Al in the bauxitic clay of employing 2o 3weight content 76%, the weight content 46.2% of MgO in the wagnerite of employing;
Wingdale, wagnerite and bauxitic clay is broken respectively and levigate to granularity≤88 order;
Wingdale, wagnerite and bauxitic clay after pulverizing are mixed and made into mixture, blending ratio is by weight percentage for Wingdale accounts for 2.6% of whole material gross weight, wagnerite accounts for 12.5% of whole material gross weight, and bauxitic clay accounts for 84.9% of whole material gross weight;
Mixture is placed in ball mill mix, then adopts ball press to make ball at the pressure of 150MPa, obtain green-ball;
Green-ball is placed in high temperature vertical kiln, under 1350oC condition, is incubated 4 hours, carry out first time calcining, make a grog;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 150MPa, obtain secondary ball material;
Secondary ball material is placed in high temperature vertical kiln, under 1700oC condition, is incubated 6 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 390%, MgO8%, CaO 2%, volume density is 3.61 g/cm 3, water-intake rate is 3.8%; Can find out, Al 2o 3content is high and the grog that CaO content is low, has larger volume density.
Embodiment 2
In the Wingdale adopted, bauxitic clay and wagnerite be with embodiment 1;
Wingdale, wagnerite and bauxitic clay is broken respectively and levigate to granularity≤88 order;
Wingdale, wagnerite and bauxitic clay after pulverizing are mixed and made into mixture, blending ratio is by weight percentage for Wingdale accounts for 7.7% of whole material gross weight, wagnerite accounts for 15.1% of whole material gross weight, and bauxitic clay accounts for 77.2% of whole material gross weight;
Mixture is placed in ball mill mix, then adopts ball press to make ball at the pressure of 150MPa, obtain green-ball;
Green-ball is placed in high temperature vertical kiln, under 1400oC condition, is incubated 2 hours, carry out first time calcining, make a grog;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 150MPa, obtain secondary ball material;
Secondary ball material is placed in high temperature vertical kiln, under 1650oC condition, is incubated 6 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 384%, MgO 10%, CaO6%, volume density is 3.27g/cm 3, water-intake rate is 3.2%; Can find out, with the increase of CaO content in grog, its volume density comparatively embodiment 1 obviously reduces.
Embodiment 3
The Wingdale adopted, bauxitic clay and wagnerite are with embodiment 1;
Wingdale, wagnerite and bauxitic clay is broken respectively and levigate to granularity≤88 order;
Wingdale, wagnerite and bauxitic clay after pulverizing are mixed and made into mixture, blending ratio is by weight percentage for Wingdale accounts for 12.3% of whole material gross weight, wagnerite accounts for 15.0% of whole material gross weight, and bauxitic clay accounts for 72.7% of whole material gross weight;
Mixture is placed in ball mill mix, then adopts ball press to make ball at the pressure of 150MPa, obtain green-ball;
Green-ball is placed in high temperature vertical kiln, under 1400oC condition, is incubated 4 hours, carry out first time calcining, make a grog;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 150MPa, obtain secondary ball material;
Secondary ball material is placed in high temperature vertical kiln, under 1650 oC conditions, is incubated 6 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 380%, MgO10%, CaO10%, volume density is 3.10 g/cm 3, water-intake rate is 2.8%; Can find out, with the increase of MgO and CaO content in grog, its volume density comparatively embodiment 1 significantly reduces, and is conducive to the lightweight realizing refractory materials.
Embodiment 4
The weight content 54.4% of CaO in the Wingdale adopted, Al in the bauxitic clay of employing 2o 3weight content 76.1%, the weight content 46.5% of MgO in the wagnerite of employing;
Wingdale, wagnerite and bauxitic clay is broken respectively and levigate to granularity≤88 order;
Wingdale, wagnerite and bauxitic clay after pulverizing are mixed and made into mixture, blending ratio is by weight percentage for Wingdale accounts for 12.3% of whole material gross weight, wagnerite accounts for 21.6% of whole material gross weight, and bauxitic clay accounts for 66.1% of whole material gross weight;
Mixture is placed in ball mill mix, then adopts ball press to make ball at the pressure of 150MPa, obtain green-ball;
Green-ball is placed in high temperature vertical kiln, under 1400oC condition, is incubated 4 hours, carry out first time calcining, make a grog;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 150MPa, obtain secondary ball material;
Secondary ball material is placed in high temperature vertical kiln, under 1700oC condition, is incubated 5 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 375%, MgO15%, CaO10%, volume density is 3.02g/cm 3, water-intake rate is 3.0%, and compared with embodiment 1, its volume density reduces 16.3%, effectively can realize the lightweight of refractory materials.
Embodiment 5
The Wingdale adopted, bauxitic clay, wagnerite are with embodiment 4;
Wingdale, wagnerite and bauxitic clay is broken respectively and levigate to granularity≤88 order;
Wingdale, wagnerite and bauxitic clay after pulverizing are mixed and made into mixture, blending ratio is by weight percentage for Wingdale accounts for 13.0% of whole material gross weight, wagnerite accounts for 7.6% of whole material gross weight, and bauxitic clay accounts for 79.4% of whole material gross weight;
Mixture is placed in ball mill mix, then adopts ball press to make ball at the pressure of 150MPa, obtain green-ball;
Green-ball is placed in high temperature vertical kiln, under 1400oC condition, is incubated 4 hours, carry out first time calcining, make a grog;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 150MPa, obtain secondary ball material;
Secondary ball material is placed in high temperature vertical kiln, under 1700oC condition, is incubated 5 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 385%, MgO5%, CaO10%, volume density is 3.17g/cm 3, water-intake rate is 3.5%.
Embodiment 6
The Wingdale adopted, bauxitic clay and the same embodiment of wagnerite, 4;
Method is with embodiment 5, and difference is: the blending ratio of mixture is by weight percentage for Wingdale accounts for 12.3% of whole material gross weight, and wagnerite accounts for 15% of whole material gross weight, and bauxitic clay accounts for 72.7% of whole material gross weight;
Pressure at 100MPa after mixing makes ball;
Green-ball is incubated 3 hours under 1350 oC conditions;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 120MPa;
Secondary ball material is placed in high temperature vertical kiln, under 1700 oC conditions, is incubated 4 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 380%, MgO10%, CaO10%, volume density is 3.41g/cm 3, water-intake rate is 2.9%; Can find out, under lower secondary becomes ball pressure, also can obtain fine and close grog.
Embodiment 7
The Wingdale adopted, bauxitic clay and wagnerite are with embodiment 4;
Method is with embodiment 5, and difference is: the blending ratio of mixture is by weight percentage for Wingdale accounts for 2.6% of whole material gross weight, and wagnerite accounts for 12.5% of whole material gross weight, and bauxitic clay accounts for 84.9% of whole material gross weight;
Pressure at 100MPa after mixing makes ball;
Green-ball is incubated 3 hours under 1350 oC conditions;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 100MPa;
Secondary ball material is placed in high temperature vertical kiln, under 1700 oC conditions, is incubated 4.5 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 390%, MgO8%, CaO2%, volume density is 3.25g/cm 3, water-intake rate is 3.4%; Can find out, under lower secondary becomes ball pressure, by proper extension calcination time, also can obtain fine and close grog.
Embodiment 8
The Wingdale adopted, bauxitic clay and wagnerite are with embodiment 4;
Method is with embodiment 5, and difference is: the blending ratio of mixture is by weight percentage for Wingdale accounts for 13% of whole material gross weight, and wagnerite accounts for 7.6% of whole material gross weight, and bauxitic clay accounts for 79.4% of whole material gross weight;
Pressure at 120MPa after mixing makes ball;
Green-ball is incubated 3 hours under 1350 oC conditions;
A chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 100MPa;
Secondary ball material is placed in high temperature vertical kiln, under 1700 oC conditions, is incubated 4.5 hours, carry out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker, its composition is by weight percentage containing Al 2o 385%, MgO5%, CaO10%, volume density is 3.18g/cm 3, water-intake rate is 3.2%; Can find out, directly affect the density of grog at lower post forming pressure and secondary clacining system, and once shaped pressure influence be less.

Claims (1)

1. an Aluminum magnesium calcium fire-resistant clinker, is characterized in that composition by weight percentage containing Al 2o 375 ~ 90%, MgO5 ~ 15%, CaO 2 ~ 10%; Volume density is 3.02 ~ 3.61g/cm 3; Water-intake rate is 2.8 ~ 3.8%; Preparation method carries out according to the following steps:
(1) Wingdale, wagnerite and bauxitic clay is broken respectively and levigate to granularity≤88 order;
(2) Wingdale, wagnerite and bauxitic clay after pulverizing are mixed and made into mixture, blending ratio is by weight percentage for Wingdale accounts for 2.6 ~ 13% of whole material gross weight, wagnerite accounts for 7.6 ~ 21.6% of whole material gross weight, and bauxitic clay accounts for 66.1 ~ 84.9% of whole material gross weight;
(3) mixture is placed in ball mill to mix, then makes ball at the pressure of 100 ~ 150MPa, obtain green-ball;
(4) green-ball is incubated 2 ~ 4 hours under 1350 ~ 1400oC condition, carries out first time calcining, make a grog;
(5) chamotte crushing is levigate to granularity≤88 order, then make ball at the pressure of 100 ~ 150MPa, obtain secondary ball material;
(6) secondary ball material is incubated 4 ~ 6 hours under 1650 ~ 1700oC condition, carries out second time calcining, obtain Aluminum magnesium calcium fire-resistant clinker.
CN201310311218.4A 2013-07-24 2013-07-24 Aluminum magnesium calcium fire-resistant clinker and preparation method thereof Active CN103396127B (en)

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CN104529200A (en) * 2015-01-22 2015-04-22 李光荣 Superfine high-temperature-resistant cement and preparation method thereof
CN104692816A (en) * 2015-02-10 2015-06-10 东北大学 Compact aluminum, magnesium, calcium grog refractory and preparation method thereof
CN104671810A (en) * 2015-02-10 2015-06-03 东北大学 Compact aluminum-magnesium-calcium fire-resistant clinker and preparation method thereof

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