CN104725058A - Periclase-pleonaste and hercynite/forsterite composite brick - Google Patents
Periclase-pleonaste and hercynite/forsterite composite brick Download PDFInfo
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Abstract
The invention discloses a periclase-pleonaste and hercynite/forsterite composite brick prepared by compounding a working layer and a heat insulation layer, wherein the working layer is prepared from magnesium-iron sand, hercynite sand and fused magnesite which serve as main raw materials; the heat insulation layer is prepared from medium-heavy synthetic olivine sand, medium-light synthetic boltonite sand, magnesite particles, fine magnesia powder and rice hull ash which serve as main raw materials; and the periclase-pleonaste and hercynite/forsterite composite brick is prepared through the steps of proportioning; mixing; molding; drying; sintering and the like. The working layer of the composite brick disclosed by the invention is strong in erosion resistance, good in thermal shock resistance and low in heat conductivity coefficient and is easily adhered to a kiln coating; the heat insulation layer is favorable in high-temperature volume stability, relatively high in mechanical strength and relatively low in heat conductivity coefficient. Therefore, the composite brick can be used for a high-temperature zone of a rotary cement kiln and is long in service life and capable of remarkably reducing the heat loss of a kiln body and has favorable energy-saving and emission reduction effects.
Description
Technical field
The present invention relates to fire resisting material field, be specifically related to a kind of periclasite-magnesium iron hercynite/forsterite composite brick.
Background technology
Cement production industry is famous big power consumer, is also the rich and influential family of discharge carbonic acid gas.At present, China's positive planned development s-generation new dry cement production technology, is reduced to 650kcal/kg by clinker production technology hear rate from 700 ~ 750kcal/kg, namely reduces hear rate 50 ~ 100kcal/kg.In cement production process, the hear rate that surface radiating causes accounts for 10% of total production technique hear rate, is 70kcal/kg; And the kiln body hear rate caused of dispelling the heat accounts for 50% in surface radiating hear rate, kiln tail preheater, decomposing furnace account for 35%, and tertiary-air pipe, cooler account for 15%.Therefore, if the hear rate that the surface radiating in cement production process causes can be reduced, can be just that very large contribution is made in the energy-saving and emission-reduction of Cement industry.The top priority reducing surface radiating hear rate reduces cement rotary kiln body heat radiation exactly, especially reduces the heat lost by radiation of cement kiln clinkering zone, transitional zone.
At present, refractory brick mainly periclasite-magnesium iron/hercynite brick (being called for short magnesium grey iron block) that cement kiln clinkering zone uses, its thermal conductivity is about 3.0W/mk; Transitional zone also has a small amount of user's magnesite-Mg-Al spinel brick (abbreviation magnesia alumina brick), and its thermal conductivity is about 3.5W/mk; From thermal conductivity, no matter be magnesium grey iron block or magnesia alumina brick, thermal conductivity is all higher, and in actual use procedure, energy-saving effect is not remarkable.Application number is 201210183879.9, what name was called " Pleonaste heat-insulation composite brick " patent discloses a kind of Pleonaste heat-insulation composite brick, this composite brick is mainly used highly-purity magnesite/electrosmelted magnesite clinker and is synthesized the major ingredient of ferro-magnesium-aluminum spinelle as flame retardant coating, with peridotites as thermofin major ingredient, but magnesia is a kind of material of high heat conduction, working lining (flame retardant coating) adopts highly-purity magnesite/electrosmelted magnesite clinker to make raw material, to greatly increase the thermal conductivity of material, offset the energy-saving effect that thermofin brings, simultaneously thermofin main raw material---peridotites belongs to heavy peridotites, its thermal conductivity is also higher, only by the thermal conductivity adding some pore-forming materials (sawdust/poly-light ball) and can not effectively reduce material in matrix, therefore, this composite brick effect of heat insulation is poor, cement rotary kiln clinkering zone energy-saving effect for having kliner coating is not remarkable, and work-ing life is short, fail to be widely applied.Therefore, need that exploitation is a kind of to be had better performance and may be used for the thermal zone composite brick of cement rotary kiln.
Summary of the invention
For problems of the prior art, the invention provides a kind of periclasite-magnesium iron hercynite/forsterite composite brick, the working lining erosion resistance of this composite brick is strong, good thermal shock stability, be easy to stick kliner coating, thermal conductivity is low, thermofin has good high volume stability, higher physical strength and lower thermal conductivity, therefore, it is thermal zone that this composite brick may be used for cement rotary kiln, and long service life, significantly can reduce the heat lost by radiation of kiln body, there is good effects of energy saving and emission reduction.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of periclasite-magnesium iron hercynite/forsterite composite brick, be composited by working lining and thermofin, the raw material of described working lining consists of: granularity is the magnesium iron sand 10 ~ 20wt% of 3-5mm, granularity is the magnesium iron sand 15 ~ 25wt% of 1-3mm, granularity is the hercynite sand 5 ~ 15wt% of 1-2mm, granularity is the magnesium iron sand 5 ~ 15wt% of 0.088-1mm, granularity is the hercynite sand 5 ~ 15wt% of 0.088-1mm, the magnesium iron sand fine powder 20 ~ 35wt% of granularity < 0.088mm and the electrosmelted magnesite clinker micro mist 5 ~ 10wt% of granularity < 0.020mm, additionally account for the water reducer of described working lining raw material gross weight 0.03 ~ 0.1wt% and the bonding agent of 4 ~ 6wt%, the raw material of described thermofin consists of: granularity is the middle heavy synthetic forsterite sand 10 ~ 20wt% of 3-5mm, granularity is the middle heavy synthetic forsterite sand 18 ~ 28wt% of 1-3mm, granularity is the middle lightweight synthetic forsterite sand 10 ~ 20wt% of 1-2mm, granularity is the middle heavy synthetic forsterite sand 4 ~ 15wt% of 0.088-1mm, granularity is the wagnerite particle 4 ~ 10wt% of 0.088-0.5mm, granularity < 0.088mm grinds by middle matter synthetic forsterite sand the fine powder 17 ~ 20wt% obtained, magnesia powder 4 ~ the 10wt% of granularity < 0.088mm and rice hull ash 3 ~ 7wt%, additionally account for the polystyrene spheres of described thermofin raw material gross weight 0 ~ 2wt% granularity < 1mm and the bonding agent of 5 ~ 10wt%.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, described middle heavy synthetic forsterite sand or middle lightweight synthetic forsterite sand are that one has high strength, low thermal conductivity (0.8 ~ 1.2W/mk), middle matter forsterite refractory that high temperature lower volume is stable, wherein, the volume density A of described middle heavy synthetic forsterite sand
1be 2.3≤A
1≤ 2.6g/cm
3; The volume density A of described middle lightweight synthetic forsterite sand
2be 1.8≤A
2< 2.3g/cm
3; Described middle matter synthetic forsterite sand is the mixture of middle heavy synthetic forsterite sand, middle lightweight synthetic forsterite sand one of them or both, and its volume density A is 1.8≤A≤2.6g/cm
3.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, the preparation method of described middle heavy synthetic forsterite sand or middle lightweight synthetic forsterite sand is:
(1) by the wagnerite tailings particles of 85 ~ 93wt% granularity < 0.2mm at 1200 ~ 1350 DEG C light-burned 0.5 ~ 5 hour, obtain calcined wagnerite tailings particles, then the silica powder of calcined wagnerite tailings particles and 7 ~ 15wt% granularity < 0.044mm is mixed, grind after mixing, obtain calcined wagnerite mine tailing-quartzy compound that particle diameter is less than 0.088mm;
(2) a. preparation in heavy synthetic forsterite sand: add in the compound that step (1) obtains pore former and bonding agent, the ratio that the add-on of pore former accounts for compound gross weight is M, 5wt%≤M≤25wt%, the add-on of bonding agent is 3 ~ 12wt% of compound gross weight, then carry out mixing, mixing, 110 ~ 150MPa pressure machine pressure, drying treatment, roasting 4 ~ 9 hours at 1650 ~ 1720 DEG C after drying, obtain middle heavy synthetic forsterite, namely the fragmentation of middle heavy synthetic forsterite is obtained middle heavy synthetic forsterite sand;
B. preparation in lightweight synthetic forsterite sand: add in the compound that step (1) obtains pore former and bonding agent, the ratio that the add-on of pore former accounts for compound gross weight is N, 25wt% < N≤40wt%, the add-on of bonding agent is 3 ~ 12wt% of compound gross weight, then carry out mixing, mixing, 110 ~ 150MPa pressure machine pressure, drying treatment, roasting 4 ~ 9 hours at 1650 ~ 1720 DEG C after drying, obtain middle lightweight synthetic forsterite, namely the fragmentation of middle lightweight synthetic forsterite is obtained middle lightweight synthetic forsterite sand.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, the wagnerite particle of described pore former to be granularity be 0.088-0.5mm.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, the chemical composition of described magnesium iron sand is: MgO 85 ~ 97wt%, Fe
2o
32 ~ 14wt%, surplus are impurity.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, described bonding agent is lignin sulfonic acid magnesium solution.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, the concentration of described lignin sulfonic acid magnesium solution is 1.05 ~ 1.25g/cm
3.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, the concentration of described lignin sulfonic acid magnesium solution is 1.15g/cm
3.
According to above-mentioned periclasite-magnesium iron hercynite/forsterite composite brick, the preparation method of described composite brick comprises the following steps:
(1) preparation work layer brickmaking material: prepare each raw material by working lining raw material composition, after mixing, then add water reducer and bonding agent, mixing to even with edge runner-wet mill;
(2) thermofin brickmaking material is prepared: prepare each raw material by thermofin raw material composition, after mixing, then add polystyrene spheres and bonding agent, mixing to even with edge runner-wet mill;
(3) shaping, burn till: with division plate bricks die separated and is divided into hot junction and cold junction two portions, working lining brickmaking material is added in hot junction, thermofin brickmaking material is added at cold junction, then division plate is extracted out, adobe is pressed into friction press, by adobe 100 ~ 120 DEG C of dryings 20 ~ 26 hours in dry kiln, then fire 5 ~ 8 hours at 1500 ~ 1600 DEG C, kiln discharge.
The positive beneficial effect of the present invention:
(1) composite brick working lining of the present invention adopts magnesium iron sand to substitute magnesia as main raw material, significantly reduces radiative transfer under hot conditions, improves the heat-proof quality of working lining; Adopt the space in the filling of electrosmelted magnesite clinker micro mist coarse aggregate, fine aggregate and the fine powder stacking volume of granularity < 0.020mm simultaneously, and coordinate water reducer use to effectively reduce apparent porosity, improve the erosion resistance of working lining, both solved and changed temperature field in brick because strengthening working lining thermal insulation, cause erosion layer expand and damage the problem of its resistance to fouling, can prevent from again using ordinary sinter magnesia ultrafine powder aquation and adobe being ftractureed simultaneously.
(2) thermofin of composite brick of the present invention adopt there is high strength, the middle matter synthetic forsterite sand of low heat conductivity substitutes high strength, the peridotites of high thermal conductivity is as major ingredient, add some particulates and pore-forming material simultaneously, solve the contradiction between composite brick thermofin high strength and low heat conductivity energy, improve composite brick thermofin intensity/thermal conductivity ratio, under the prerequisite not affecting thermofin intensity, further increase its thermal insulation.
(3) composite brick of the present invention adopts lignin sulfonic acid magnesium solution to replace traditional bonding agent---lignin sulfonic acid calcium solution, can avoid in composite brick sintering process, forming eutectic material (CaOMgOSiO
2), play the effect of high temperature resistant, the erosion-resisting characteristics improving working layer, can also reduce insulating layer material burns till contraction simultaneously, improves the qualification rate of composite brick finished product.
(4) strong, the good thermal shock stability of the working lining erosion resistance of composite brick of the present invention, be easy to stick kliner coating, thermal conductivity is low, refractoriness under load is low; Thermofin has good high volume stability, higher physical strength and lower thermal conductivity, this composite brick integrates fire-resistant with heat insulating function, effectively compensate for pleonast(e) composite brick, shortcoming that magnesium aluminate spinel composite brick thermal conductivity is high, therefore, may be used for cement rotary kiln thermal zone, and long service life, significantly can reduce the heat lost by radiation of kiln body, there is good effects of energy saving and emission reduction; And production cost is lower, there is good economic and social benefit, can apply.
(5) composite brick of the present invention and Pleonaste heat-insulation composite brick of the prior art (application number: performance comparison (see table 1) 201210183879.9).As shown in Table 1, the thermal conductivity of composite brick working lining of the present invention and thermofin is respectively 2.5 ~ 2.6W/mk and 0.8 ~ 1.1W/mk, has had obvious reduction, significantly improve comprehensive effect of heat insulation compared with Pleonaste heat-insulation composite brick; Meanwhile, working lining apparent porosity has been reduced to 12 ~ 13%, improves its resistance to fouling.
The performance comparison of table 1 composite brick of the present invention and existing Pleonaste heat-insulation composite brick
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but the present invention is not limited to these embodiments.
Embodiment 1 ~ 6:
The raw material composition of periclasite in table 2 embodiment 1 ~ 6-magnesium iron hercynite/forsterite composite brick working lining and thermofin
Note: 1) described in embodiment 1 and 2, the concentration of lignin sulfonic acid magnesium solution is 1.05g/cm
3, the chemical composition of described magnesium iron sand is: MgO 85wt%, Fe
2o
314wt%, surplus are impurity, and described middle matter synthetic forsterite sand refers to middle heavy synthetic forsterite sand; 2) concentration of lignin sulfonic acid magnesium solution described in embodiment 3 is 1.25g/cm
3, the chemical composition of described magnesium iron sand is: MgO 90wt%, Fe
2o
38wt%, surplus are impurity, and described middle matter synthetic forsterite sand refers to middle lightweight synthetic forsterite sand; 3) described in embodiment 4 and 5, the concentration of lignin sulfonic acid magnesium solution is 1.15g/cm
3, the chemical composition of described magnesium iron sand is: MgO 85wt%, Fe
2o
310wt%, surplus are impurity, and described middle matter synthetic forsterite sand refers to the mixture of middle heavy synthetic forsterite sand and middle lightweight synthetic forsterite sand; 4) concentration of lignin sulfonic acid magnesium solution described in embodiment 6 is 1.15g/cm
3, the chemical composition of described magnesium iron sand is: MgO 97wt%, Fe
2o
32wt%, surplus are impurity, and described middle matter synthetic forsterite sand refers to middle lightweight synthetic forsterite sand.
Embodiment 7:
One of preparation method of periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is described arbitrarily, comprise the following steps: (1) preparation work layer brickmaking material: prepare each raw material by working lining raw material composition, after mixing, add water reducer and bonding agent again, mixing to even with edge runner-wet mill; (2) thermofin brickmaking material is prepared: prepare each raw material by thermofin raw material composition, after mixing, then add polystyrene spheres and bonding agent, mixing to even with edge runner-wet mill; (3) shaping, burn till: with division plate bricks die separated and is divided into hot junction and cold junction two portions, working lining brickmaking material is added in hot junction, thermofin brickmaking material is added at cold junction, then division plate is extracted out, adobe is pressed into friction press, by adobe 100 DEG C of dryings 26 hours in dry kiln, then fire 5 hours at 1600 DEG C, kiln discharge.
Embodiment 8:
The preparation method's of periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is arbitrarily described is two substantially the same manner as Example 7, its difference is: after making adobe, by adobe 120 DEG C of dryings 20 hours in dry kiln, then 8 hours are fired at 1500 DEG C, kiln discharge.
Embodiment 9:
The preparation method's of periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is arbitrarily described is three substantially the same manner as Example 7, its difference is: after making adobe, by adobe 110 DEG C of dryings 24 hours in dry kiln, then 7 hours are fired at 1550 DEG C, kiln discharge.
Embodiment 10:
The preparation method's of periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is arbitrarily described is four substantially the same manner as Example 7, its difference is: after making adobe, by adobe 110 DEG C of dryings 20 hours in dry kiln, then 5 hours are fired at 1500 DEG C, kiln discharge.
The performance test results of the composite brick that the embodiment of the present invention 1 ~ 6 prepares is in table 3.
The composite brick performance perameter detected result that table 3 embodiment 1 ~ 6 prepares
(1) in periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is described arbitrarily:
One of preparation method of described middle heavy synthetic forsterite sand is: (1) was by the wagnerite tailings particles of 93wt% granularity < 0.2mm at 1350 DEG C light-burned 0.5 hour, obtain calcined wagnerite tailings particles, then the silica powder of calcined wagnerite tailings particles and 7wt% granularity < 0.044mm is mixed, grind after mixing, obtain calcined wagnerite mine tailing-quartzy compound that particle diameter is less than 0.088mm; (2) in above-mentioned compound, add the granularity accounting for compound gross weight 5wt% is the wagnerite particle of 0.088-0.5mm and the lignin sulfonic acid magnesium solution of 3wt%, carry out mixing, mixing, 150MPa pressure machine pressure, drying treatment, roasting 9 hours at 1720 DEG C after drying, obtain middle heavy synthetic forsterite, namely the fragmentation of middle heavy synthetic forsterite is obtained middle heavy synthetic forsterite sand.
Wherein, described wagnerite tailings particles extracts the material that high-purity ore leaves over for Brick With Magnesite Purified By Flotation stone, and its main chemical compositions is: MgO 40.7%, SiO
219.4%, CaO 0.7%, Al
2o
34.5%, Fe
2o
30.8%, KCl 0.7%, loss on ignition 33.2%.
The preparation method of described middle lightweight synthetic forsterite sand is substantially identical with middle heavy synthetic forsterite sand, concrete difference is pore former---granularity is the add-on of the wagnerite particle of 0.088-0.5mm is 26wt%, and the add-on of bonding agent---lignin sulfonic acid magnesium solution is 6wt%.
(2) in periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is described arbitrarily:
The preparation method's of described middle heavy synthetic forsterite sand two is: (1) was by the wagnerite tailings particles of 91wt% granularity < 0.2mm at 1300 DEG C light-burned 1 hour, obtain calcined wagnerite tailings particles, then the silica powder of calcined wagnerite tailings particles and 9wt% granularity < 0.044mm is mixed, grind after mixing, obtain calcined wagnerite mine tailing-quartzy compound that particle diameter is less than 0.088mm; (2) in above-mentioned compound, add the granularity accounting for compound gross weight 10wt% is the wagnerite particle of 0.088-0.5mm and the lignin sulfonic acid magnesium solution of 6wt%, carry out mixing, mixing, 140MPa pressure machine pressure, drying treatment, roasting 8 hours at 1700 DEG C after drying, obtain middle heavy synthetic forsterite, namely the fragmentation of middle heavy synthetic forsterite is obtained middle heavy synthetic forsterite sand.
Wherein, the main chemical compositions of described wagnerite tailings particles is: MgO 40.7%, SiO
219.4%, CaO 0.7%, Al
2o
34.5%, Fe
2o
30.8%, KCl 0.7%, loss on ignition 33.2%.
The preparation method of described middle lightweight synthetic forsterite sand is substantially identical with middle heavy synthetic forsterite sand, concrete difference is pore former---granularity is the add-on of the wagnerite particle of 0.088-0.5mm is 30wt%, and the add-on of bonding agent---lignin sulfonic acid magnesium solution is 8wt%.
(3) in periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is described arbitrarily:
The preparation method's of described middle heavy synthetic forsterite sand three is: (1) was by the wagnerite tailings particles of 85wt% granularity < 0.2mm at 1200 DEG C light-burned 5 hours, obtain calcined wagnerite tailings particles, then the silica powder of calcined wagnerite tailings particles and 15wt% granularity < 0.044mm is mixed, grind after mixing, obtain calcined wagnerite mine tailing-quartzy compound that particle diameter is less than 0.088mm; (2) in above-mentioned compound, add the granularity accounting for compound gross weight 15wt% is the wagnerite particle of 0.088-0.5mm and the lignin sulfonic acid magnesium solution of 10wt%, carry out mixing, mixing, 110MPa pressure machine pressure, drying treatment, roasting 4 hours at 1650 DEG C after drying, obtain middle heavy synthetic forsterite, namely the fragmentation of middle heavy synthetic forsterite is obtained middle heavy synthetic forsterite sand.
Wherein, described wagnerite tailings particles extracts the material that high-purity ore leaves over for Brick With Magnesite Purified By Flotation stone, and its main chemical compositions is: MgO 40.6%, SiO
217.6%, CaO 0.8%, Al
2o
33.5%, Fe
2o
31.0%, KCl 0.6%, loss on ignition 35.9%.
The preparation method of described middle lightweight synthetic forsterite sand is substantially identical with middle heavy synthetic forsterite sand, concrete difference is pore former---granularity is the add-on of the wagnerite particle of 0.088-0.5mm is 40wt%, and the add-on of bonding agent---lignin sulfonic acid magnesium solution is 12wt%.
(4) in periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is described arbitrarily:
The preparation method's of described middle heavy synthetic forsterite sand four is: (1) was by the wagnerite tailings particles of 90wt% granularity < 0.2mm at 1280 DEG C light-burned 3 hours, obtain calcined wagnerite tailings particles, then the silica powder of calcined wagnerite tailings particles and 10wt% granularity < 0.044mm is mixed, grind after mixing, obtain calcined wagnerite mine tailing-quartzy compound that particle diameter is less than 0.088mm; (2) in above-mentioned compound, add the granularity accounting for compound gross weight 20wt% is the wagnerite particle of 0.088-0.5mm and the lignin sulfonic acid magnesium solution of 8wt%, carry out mixing, mixing, 130MPa pressure machine pressure, drying treatment, roasting 6 hours at 1680 DEG C after drying, obtain middle heavy synthetic forsterite, namely the fragmentation of middle heavy synthetic forsterite is obtained middle heavy synthetic forsterite sand.
Wherein, the main chemical compositions of described wagnerite tailings particles is: MgO 40.5%, SiO
215.8%, CaO 1.0%, Al
2o
32.5%, Fe
2o
31.2%, KCl 0.4%, loss on ignition 38.6%.
The preparation method of described middle lightweight synthetic forsterite sand is substantially identical with middle heavy synthetic forsterite sand, concrete difference is pore former---granularity is the add-on of the wagnerite particle of 0.088-0.5mm is 35wt%, and the add-on of bonding agent---lignin sulfonic acid magnesium solution is 12wt%.
(5) in periclasite-magnesium iron hercynite/forsterite composite brick that one of above-described embodiment 1 ~ 6 is described arbitrarily:
The preparation method's of described middle heavy synthetic forsterite sand five is: (1) was by the wagnerite tailings particles of 88wt% granularity < 0.2mm at 1250 DEG C light-burned 4 hours, obtain calcined wagnerite tailings particles, then the silica powder of calcined wagnerite tailings particles and 12wt% granularity < 0.044mm is mixed, grind after mixing, obtain calcined wagnerite mine tailing-quartzy compound that particle diameter is less than 0.088mm; (2) in above-mentioned compound, add the granularity accounting for compound gross weight 25wt% is the wagnerite particle of 0.088-0.5mm and the lignin sulfonic acid magnesium solution of 10wt%, carry out mixing, mixing, 120MPa pressure machine pressure, drying treatment, roasting 5 hours at 1670 DEG C after drying, obtain middle heavy synthetic forsterite, namely the fragmentation of middle heavy synthetic forsterite is obtained middle heavy synthetic forsterite sand.
Wherein, described wagnerite tailings particles extracts the material that high-purity ore leaves over for Brick With Magnesite Purified By Flotation stone, and its main chemical compositions is: MgO 40.5%, SiO
215.8%, CaO 1.0%, Al
2o
32.5%, Fe
2o
31.2%, KCl 0.4%, loss on ignition 38.6%.
The preparation method of described middle lightweight synthetic forsterite sand is substantially identical with middle heavy synthetic forsterite sand, and concrete difference is pore former---and granularity is the add-on of the wagnerite particle of 0.088-0.5mm is 30wt%.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art also can make multiple change accordingly, but to be anyly equal to the present invention or similar change all should be encompassed in the scope of the claims in the present invention.
Claims (10)
1. periclasite-magnesium iron hercynite/forsterite composite brick, be composited by working lining and thermofin, it is characterized in that: the raw material of described working lining consists of: granularity is the magnesium iron sand 10 ~ 20wt% of 3-5mm, granularity is the magnesium iron sand 15 ~ 25wt% of 1-3mm, granularity is the hercynite sand 5 ~ 15wt% of 1-2mm, granularity is the magnesium iron sand 5 ~ 15wt% of 0.088-1mm, granularity is the hercynite sand 5 ~ 15wt% of 0.088-1mm, the magnesium iron sand fine powder 20 ~ 35wt% of granularity < 0.088mm and the electrosmelted magnesite clinker micro mist 5 ~ 10wt% of granularity < 0.020mm, additionally account for the water reducer of described working lining raw material gross weight 0.03 ~ 0.1wt% and the bonding agent of 4 ~ 6wt%,
The raw material of described thermofin consists of: granularity is the middle heavy synthetic forsterite sand 10 ~ 20wt% of 3-5mm, granularity is the middle heavy synthetic forsterite sand 18 ~ 28wt% of 1-3mm, granularity is the middle lightweight synthetic forsterite sand 10 ~ 20wt% of 1-2mm, granularity is the middle heavy synthetic forsterite sand 4 ~ 15wt% of 0.088-1mm, granularity is the wagnerite particle 4 ~ 10wt% of 0.088-0.5mm, granularity < 0.088mm grinds by middle matter synthetic forsterite sand the fine powder 17 ~ 20wt% obtained, magnesia powder 4 ~ the 10wt% of granularity < 0.088mm and rice hull ash 3 ~ 7wt%, additionally account for the polystyrene spheres of described thermofin raw material gross weight 0 ~ 2wt% granularity < 1mm and the bonding agent of 5 ~ 10wt%.
2. periclasite according to claim 1-magnesium iron hercynite/forsterite composite brick, is characterized in that: the volume density A of described middle heavy synthetic forsterite sand
1be 2.3≤A
1≤ 2.6g/cm
3; The volume density A of described middle lightweight synthetic forsterite sand
2be 1.8≤A
2< 2.3g/cm
3; Described middle matter synthetic forsterite sand is the mixture of middle heavy synthetic forsterite sand, middle light forsterite sand one of them or both, and its volume density A is 1.8≤A≤2.6g/cm
3.
3. periclasite according to claim 2-magnesium iron hercynite/forsterite composite brick, is characterized in that: the preparation method of described middle heavy synthetic forsterite sand or middle lightweight synthetic forsterite sand is:
(1) by the wagnerite tailings particles of 85 ~ 93wt% granularity < 0.2mm at 1200 ~ 1350 DEG C light-burned 0.5 ~ 5 hour, obtain calcined wagnerite tailings particles, then the silica powder of calcined wagnerite tailings particles and 7 ~ 15wt% granularity < 0.044mm is mixed, grind after mixing, obtain calcined wagnerite mine tailing-quartzy compound that particle diameter is less than 0.088mm;
(2) a. preparation in heavy synthetic forsterite sand: add in the compound that step (1) obtains pore former and bonding agent, the ratio that the add-on of pore former accounts for compound gross weight is M, 5wt%≤M≤25wt%, the add-on of bonding agent is 3 ~ 12wt% of compound gross weight, then carry out mixing, mixing, 110 ~ 150MPa pressure machine pressure, drying treatment, roasting 4 ~ 9 hours at 1650 ~ 1720 DEG C after drying, obtain middle heavy synthetic forsterite, namely the fragmentation of middle heavy synthetic forsterite is obtained middle heavy synthetic forsterite sand;
B. preparation in lightweight synthetic forsterite sand: add in the compound that step (1) obtains pore former and bonding agent, the ratio that the add-on of pore former accounts for compound gross weight is N, 25wt% < N≤40wt%, the add-on of bonding agent is 3 ~ 12wt% of compound gross weight, then carry out mixing, mixing, 110 ~ 150MPa pressure machine pressure, drying treatment, roasting 4 ~ 9 hours at 1650 ~ 1720 DEG C after drying, obtain middle lightweight synthetic forsterite, namely the fragmentation of middle lightweight synthetic forsterite is obtained middle lightweight synthetic forsterite sand.
4. periclasite according to claim 3-magnesium iron hercynite/forsterite composite brick, is characterized in that: the wagnerite particle of described pore former to be granularity be 0.088-0.5mm.
5. periclasite according to claim 1-magnesium iron hercynite/forsterite composite brick, is characterized in that: the chemical composition of described magnesium iron sand is: MgO 85 ~ 97wt%, Fe
2o
32 ~ 14wt%, surplus are impurity.
6. periclasite according to claim 1-magnesium iron hercynite/forsterite composite brick, is characterized in that: described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid.
7. the periclasite according to claim 1 or 3-magnesium iron hercynite/forsterite composite brick, is characterized in that: described bonding agent is lignin sulfonic acid magnesium solution.
8. periclasite according to claim 7-magnesium iron hercynite/forsterite composite brick, is characterized in that: the concentration of described lignin sulfonic acid magnesium solution is 1.05 ~ 1.25g/cm
3.
9. periclasite according to claim 8-magnesium iron hercynite/forsterite composite brick, is characterized in that: the concentration of described lignin sulfonic acid magnesium solution is 1.15g/cm
3.
10. periclasite according to claim 1-magnesium iron hercynite/forsterite composite brick, is characterized in that: the preparation method of described composite brick comprises the following steps:
(1) preparation work layer brickmaking material: prepare each raw material by working lining raw material composition, after mixing, then add water reducer and bonding agent, mixing to even with edge runner-wet mill;
(2) thermofin brickmaking material is prepared: prepare each raw material by thermofin raw material composition, after mixing, then add polystyrene spheres and bonding agent, mixing to even with edge runner-wet mill;
(3) shaping, burn till: with division plate bricks die separated and is divided into hot junction and cold junction two portions, working lining brickmaking material is added in hot junction, thermofin brickmaking material is added at cold junction, then division plate is extracted out, adobe is pressed into friction press, by adobe 100 ~ 120 DEG C of dryings 20 ~ 26 hours in dry kiln, then fire 5 ~ 8 hours at 1500 ~ 1600 DEG C, kiln discharge.
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| CN115925433A (en) * | 2022-12-31 | 2023-04-07 | 海城利尔麦格西塔材料有限公司 | Forsterite composite brick and preparation method thereof |
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