CN104725057B - Midst density forsterite sand and preparation method thereof - Google Patents
Midst density forsterite sand and preparation method thereof Download PDFInfo
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- CN104725057B CN104725057B CN201510104027.XA CN201510104027A CN104725057B CN 104725057 B CN104725057 B CN 104725057B CN 201510104027 A CN201510104027 A CN 201510104027A CN 104725057 B CN104725057 B CN 104725057B
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Abstract
The present invention relates to a kind of Midst density forsterite sand and preparation method.Technical scheme is：85~93%wt magnesite mine tailing is taken light-burned 0.5~5 hour at 1200~1350 DEG C, the silica flour mixed grinding with 7~15%wt obtains the quartzy compound of light-burned mine tailing of the particle diameter less than 0.088mm；The additional pore former for accounting for above-mentioned 5~40%wt of compound, 3~12wt% bonding agent successively again, mixed, kneaded, 110~150MPa pressure machines pressure, drying process；It is calcined 4~9 hours at 1650~1720 DEG C after processing, the stable Midst density forsterite of high volume is made.The present invention is with the good Midst density forsterite of the high fire resisting, heat-proof quality that light-burned mine tailing, silica flour are raw material preparation, with low heat conduction, high volume stability；The kiln composite brick high temperature resistant that is prepared with it, anti-erosion, thermal shock performance are good, service life is long, with good energy-saving effect.
Description
Technical field
The invention belongs to technical field of refractory materials, and in particular to a kind of stable Midst density forsterite sand of high volume and
Its preparation method.
Technical background
Cement industry is famous big power consumer, is also the rich and influential family for discharging carbon dioxide.In the heat consumption of cement, surface dissipates
Heat loss accounts for 10%, up to 70kcal/kg.Wherein, kiln body radiating accounts for 50% always radiated, and kiln tail preheater, dore furnace are about
35% is accounted for, tertiary-air pipe, cooler account for 15%.At present, China is just planning second generation new dry cement production technology, will be ripe
Expect that heat consumption, from 700~750kcal/kg, is reduced to 650kcal/kg or so, that is, reduce by 50~100kcal/kg of heat consumption；If
Radiation loss can be effectively reduced in actual production, the energy-saving and emission-reduction for cement industry are made to very big contribution, reduction radiating is damaged
Mistake first has to reduction kiln cylinder body, especially cement kiln clinkering zone, the radiation loss of intermediate zone.
At present, cement kiln clinkering zone mainly uses periclase-magnesium iron/hercynite brick (magnesium grey iron block or magnesium iron material),
Its thermal conductivity factor is about 3.0w/mk；Intermediate zone uses a small amount of periclase-Mg-Al spinel brick (magnesia-alumina brick or magnalium material),
Its thermal conductivity factor is about 3.6w/mk.Also there is the composite brick that thermal insulation layer is heavy forsterite in cement industry, its thermal conductivity factor is
1.7w/mk, the intensity height of heavy forsterite brick, thermal insulation are low, and the thermal insulation of lightweight forsterite brick height but low intensity.Mesh
Before, though there is the synthesis of Midst density forsterite sand, its apparent porosity is higher, and stomata is more, and high volume stability is bad, no
Brickmaking can be combined with the good dense material of heat-resisting quantity.The application develops a kind of moderate with moderate strength, thermal conductivity factor
New raw material, i.e., bulk density be 1.8~2.6g/cm3And high temperature lower volume it is stable (1550 DEG C of 3 hours reheat linear changes-
0.5%~Midst density forsterite refractory raw material 0.0%) (matter forsterite refractory raw material in i.e.), for preparing resistance to pressure
Degree is the final heat-barrier material that 30~45MPa, thermal conductivity factor are 0.8~1.2w/mk, can effectively reduce dissipating in the course of work
Heat loss.Prepared and be combined with middle matter forsterite material with magnesium iron material and middle matter forsterite material, or magnalium material
Brick, the then working lining being made up of magnesium iron or magnalium material has the performances such as good high temperature resistant, anti-erosion, resistance to thermal shock；By middle matter
The thermal insulation layer of forsterite material composition has preferable mechanical strength and heat-proof quality, is synthesized especially with present invention process
High volume it is stable in the composite brick for preparing of matter forsterite raw material, thermal insulation layer will not occur excessive sintering shrinkage and damage
It is bad.Therefore composite brick manufacture qualification rate is high, and good energy-conserving effect, service life is long, existing good manufacturing property, there is good again
Using effect.
The content of the invention
It is an object of the invention to provide the forsterite raw material that a kind of Midst density, high volume are stable, for manufacturing cement
The kiln composite brick such as kiln, to reach the purpose for reducing magnesia resource consumption and cement kiln tube body radiation loss；
Another object of the present invention is to provide a kind of preparation method of the stable Midst density forsterite sand of high volume.
The present invention seeks to what is be achieved through the following technical solutions：
A kind of Midst density forsterite sand, raw material, which is constituted, is：Particle diameter be less than 0.2mm 85~93wt% of magnesite mine tailing and
Particle diameter is less than 0.044mm 7~15wt% of silica flour；The additional pore former for accounting for 5~40wt% of above-mentioned raw materials total amount and account for again
State 3~12wt% of raw material total amount bonding agent.
Described Midst density forsterite sand, its bulk density is 1.8~2.6g/cm3。
Described Midst density forsterite sand, wherein magnesite mine tailing extract high-purity ore by Brick With Magnesite Purified By Flotation stone and left
Material, its main chemical compositions is：MgO：40.5~40.7%, SiO2：15.8~19.4%, CaO：0.7~1.0%,
Al2O3：2.5~4.5%, Fe2O3：0.8~1.2%, KCl：0.4~0.7%, loss on ignition：33.2~38.6%.
The purity of the silica flour is more than 96%.
Described Midst density forsterite sand, wherein pore former are that magnesite fine grained, bonding agent are that lignosulfonic acid magnesium is molten
Liquid.
Described Midst density forsterite sand, the magnesite fine grained is obtained using screening-wind election process production,
Particle diameter is 0.088~0.5mm；The concentration of the lignosulfonic acid magnesium solution is 1.05~1.25g/cm3。
Screening-wind election process production magnesite fine grained：The magnesite that particle diameter is less than 0.5mm is obtained with the method for screening first
Stone particle, then removes the magnesite fine grained that particle diameter is less than 0.088mm with the method for selection by winnowing.Exist in the magnesite particulate
Under can be formed 0.088~0.5mm isolate stomata, to improve material intensity, reduction thermal conductivity factor and reduce volatile component
(alkali, sulphur, chlorine etc.) condenses, it is ensured that the long-term use of heat-barrier material plays vital effect.
A kind of preparation method of above-mentioned Midst density forsterite sand, comprises the following steps：
(1) magnesite mine tailing is weighed, light-burned 0.5~5 hour at 1200~1350 DEG C, calcined wagnerite mine tailing is obtained；
(2) by calcined wagnerite mine tailing, silica flour by above-mentioned weight than mixing, entering mill is ground, is blended, and obtains particle diameter
Calcined wagnerite mine tailing-quartz compound less than 0.088mm；
(3) to weigh calcined wagnerite mine tailing-quartz compound, magnesite by the weight ratio of above-mentioned compound and external feeding thin
Grain mixed, be then proportionally added into lignosulfonic acid magnesium solution, mixed, kneaded, machine pressure, drying process, wherein machine pressure
Pressure is 110~150MPa；
(4) material after step (3) processing is calcined 4~9 hours at 1650~1720 DEG C, obtains reheating material；Will
Reheating material is crushed, that is, obtains Midst density forsterite sand.
The preparation method of the Midst density forsterite sand, the light roasting temperature of wherein step (1) the magnesite mine tailing is
1250~1300 DEG C, the light-burned time is 4~1 hours；The sintering temperature of step (4) described material is 1670~1700 DEG C, roasting
Time is 5~8 hours.
The present invention has the positive effect that：
(1) many local mine tailing accumulations, had not only taken a large amount of soils but also with the danger for occurring geological disaster, present invention tail
Ore deposit saves the land resource of preciousness, reduces the generation of geological disaster, reduce life as the component for preparing forsterite sand
Produce cost.
(2) it is 0.088~0.5mm magnesite fine grained as cheap pore creating material that the present invention, which uses particle diameter, reduces life
Produce cost；This particle can form tiny and isolated stomata, and tiny aperture is conducive to the raising of forsterite sand intensity, lonely
Vertical stomata advantageously reduces the volatile materials such as alkali in cement kiln, sulphur, chlorine deposition, prevents them from playing mineralization and makes fire resisting
Material is rotten, destruction, effectively increases the Long-Term Properties of material, extends the service life of material.
(3) present invention is using silica flour as one of raw material components, and lignosulfonic acid magnesium is as bonding agent, and effectively prevent makes
The CaO and formation monticellite CMS introduced with wooden calcium sulfonate, so as to produce the stable middle matter forsterite of high volume
Sand.
(4) present invention utilizes the mine tailing produced during ore dressing, and additional silica flour and magnesite pore creating material is prepared with high resistance to
The Midst density refractory material of fiery, preferable heat-proof quality, for preparing kiln composite brick, can reach the effect of energy-saving and emission-reduction.
Following table is that the middle matter forsterite sand prepared using the present invention is that composite brick and existing magnesium iron point prepared by raw material are brilliant
The performance comparison of the heat-insulated composite brick of stone：
The data in table：The composite brick that the middle matter forsterite sand prepared by the use of the present invention is prepared as raw material is heat-insulated
Layer apparent porosity is small, thermal conductivity factor is low, therefore thermal insulation layer will not occur excessive sintering shrinkage and damage, good energy-conserving effect.Cause
This composite brick manufacture qualification rate is high, and service life is long, and existing good manufacturing property has good using effect again.
(5) forsterite prepared by technical solution of the present invention has Midst density, low heat conduction, high volume stability；With light
It is raw material to burn mine tailing, silica flour, efficiently solves the lance between heat-barrier material, low heat conduction, low price and high volume stability
Shield.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, and the following example is not intended to limit the present invention
Protection domain, all modifications for making of thoughts based on the present invention belong to the scope of protection of the invention with adjustment.
Embodiment one：
A kind of Midst density forsterite sand, raw material, which is constituted, is：Particle diameter is less than 0.2mm magnesite mine tailing 85wt%, particle diameter
Silica flour 15%wt less than 0.044mm, additional particle diameter is 0.5~0.088mm magnesite fine grained 40wt%, lignosulfonic acid
Binding agent for magnesium 12wt%；
The chemical composition of the mine tailing is：MgO=40.6%, SiO2=17.6%, CaO=0.8%, Al2O3=3.5%,
Fe2O3=1.0%, KCl=0.6%, loss on ignition=35.9%；
The concentration of the lignosulfonic acid magnesium solution is 1.05g/cm3；
The forsterite sand prepared：Bulk density is 2.11g/cm3, and apparent porosity is 36%；Reheating 3 is small at 1550 DEG C
Shi Hou, reheat linear change is -0.35%.
The preparation method of Midst density forsterite sand, comprises the following steps described in above-described embodiment 1：
(1) magnesite mine tailing is weighed, light-burned 5 hours at 1200 DEG C, calcined wagnerite mine tailing is obtained；
(2) calcined wagnerite mine tailing, silica flour, than entering mill grinding, blending after mixing, are obtained into particle diameter small by above-mentioned weight
In 0.088mm calcined wagnerite mine tailing-quartz compound；
(3) calcined wagnerite mine tailing-quartz compound, magnesite particulate are weighed by the weight ratio of above-mentioned raw materials and external feeding
Mixed, then add lignosulfonic acid magnesium solution, mixing, mixing, with 110MPa pressure machines pressure, drying process；
(4) material after step (3) processing is calcined 4 hours at 1650 DEG C, obtains reheating material；Reheating material is broken
Broken, as high volume stablizes Midst density forsterite sand.
Embodiment two：
A kind of Midst density forsterite sand, raw material mainly includes：Particle diameter is less than 0.2mm magnesite mine tailing 88wt%, grain
Footpath is less than 0.04mm silica flour 12wt%, and additional particle diameter is 0.5~0.088mm magnesite fine grained 30wt%, wooden sulphur
Sour binding agent for magnesium 10wt%；
The chemical composition of the mine tailing is：MgO=40.5%, SiO2=15.8%, CaO=1.0%, Al2O3=2.5%,
Fe2O3=1.2%, KCl=0.4%, loss on ignition=38.6%；
The concentration of the lignosulfonic acid magnesium solution is 1.10g/cm3；
The forsterite sand prepared：Bulk density is 2.19g/cm3, apparent porosity is 33%；Reheating 3 is small at 1550 DEG C
Shi Hou, reheat linear change is -0.29%.
The preparation method of Midst density forsterite sand, comprises the following steps described in above-described embodiment 2：
(1) magnesite mine tailing is weighed, light-burned 4 hours at 1250 DEG C, calcined wagnerite mine tailing is obtained；
(2) calcined wagnerite mine tailing, silica flour, than entering mill grinding, blending after mixing, are obtained into particle diameter small by above-mentioned weight
In 0.088mm calcined wagnerite mine tailing-quartz compound；
(3) calcined wagnerite mine tailing-quartz compound, magnesite particulate are weighed by the weight ratio of above-mentioned raw materials and external feeding
Mixed, then add lignosulfonic acid magnesium solution, mixing, mixing, with 120MPa pressure machines pressure, drying process；
(4) material after step (3) processing is calcined 5 hours at 1670 DEG C, obtains reheating material；Reheating material is broken
It is broken, as high volume it is stable in matter forsterite sand.
Embodiment three：
A kind of Midst density forsterite sand, raw material mainly includes：Particle diameter is less than 0.2mm magnesite mine tailing 90wt%, grain
Footpath is less than 0.044mm silica flour 10wt%, and additional particle diameter is 0.5~0.088mm magnesite fine grained 20wt%, wooden sulphur
Sour binding agent for magnesium 8wt%；
The chemical composition of the mine tailing is：MgO=40.5%, SiO2=15.8%, CaO=1.0%, Al2O3=2.5%,
Fe2O3=1.2%, KCl=0.4%, loss on ignition=38.6%；
The concentration of the lignosulfonic acid magnesium solution is 1.15g/cm3；
The forsterite sand prepared：Bulk density is 2.3g/cm3, apparent porosity is 31%；Reheating 3 is small at 1550 DEG C
Shi Hou, reheat linear change is -0.31%.
One of preparation method of Midst density forsterite sand, comprises the following steps described in above-described embodiment 3：
(1) magnesite mine tailing is weighed, light-burned 3 hours at 1280 DEG C, calcined wagnerite mine tailing is obtained；
(2) calcined wagnerite mine tailing, silica flour, than entering mill grinding, blending after mixing, are obtained into particle diameter small by above-mentioned weight
In 0.088mm calcined wagnerite mine tailing-quartz compound；
(3) to weigh calcined wagnerite mine tailing-quartz compound, magnesite by the weight ratio of above-mentioned raw materials and external feeding thin
Grain, then adds lignosulfonic acid magnesium solution, mixing, mixing, with 130MPa pressure machines pressure, drying process；
(4) material after step (3) processing is calcined 6 hours at 1680 DEG C, obtains reheating material；Reheating material is broken
It is broken, as high volume it is stable in matter forsterite sand.
Example IV：
A kind of Midst density forsterite sand, raw material mainly includes：Particle diameter is less than 0.2mm magnesite mine tailing 91wt%, grain
Footpath is less than 0.044mm silica flour 9wt%, additional 0.5~0.088mm magnesite particulate 10wt%, and lignosulfonic acid magnesium is combined
Agent 8wt%；
Described mine tailing chemical composition is：MgO=40.7%, SiO2=19.4%, CaO=0.7%, Al2O3=4.5%,
Fe2O3=0.8%, KCl=0.7%, loss on ignition=33.2%；
The concentration of the lignosulfonic acid magnesium solution is 1.20g/cm3；
The forsterite sand prepared：Bulk density is 2.50g/cm3, apparent porosity is 25%；Reheating 3 is small at 1550 DEG C
When after reheat linear change be -0.1%.
The preparation method of Midst density forsterite sand, comprises the following steps described in above-described embodiment 4：
(1) magnesite mine tailing is weighed, light-burned 1 hour at 1350 DEG C, calcined wagnerite mine tailing is obtained；
(2) calcined wagnerite mine tailing, silica flour, than entering mill grinding, blending after mixing, are obtained into particle diameter small by above-mentioned weight
In 0.088mm calcined wagnerite mine tailing-quartz compound；
(3) calcined wagnerite mine tailing-quartz compound, magnesite particulate are weighed by the weight ratio of above-mentioned raw materials and external feeding
Mixed, then add lignosulfonic acid magnesium solution, mixing, mixing, with 140MPa pressure machines pressure, drying process；
(4) material after step (3) processing is calcined 9 hours at 1720 DEG C, obtains reheating material；Reheating material is broken
It is broken, as high volume it is stable in matter forsterite sand.
Claims (2)
1. a kind of Midst density forsterite sand, it is characterised in that raw material, which is constituted, is：Particle diameter is less than 0.2mm magnesite mine tailing 85
~93wt% and particle diameter are less than 0.044mm 7~12wt% of silica flour；Again it is additional account for 5~40wt% of above-mentioned raw materials total amount into
Hole agent and the bonding agent for accounting for 6~12wt% of above-mentioned raw materials total amount；
Described pore former is magnesite fine grained, and its particle diameter is 0.088~0.5mm；Described bonding agent is lignosulfonic acid magnesium
Solution, the concentration of the lignosulfonic acid magnesium solution is 1.05~1.25g/cm3；
The preparation method of described Midst density forsterite sand, comprises the following steps：
(1) magnesite mine tailing is weighed, light-burned 4~1 hours at 1250~1300 DEG C, calcined wagnerite mine tailing is obtained；
(2) by calcined wagnerite mine tailing, silica flour by above-mentioned weight than mixing, entering mill is ground, is blended, and obtains particle diameter and is less than
0.088mm calcined wagnerite mine tailing-quartz compound；
(3) calcined wagnerite mine tailing-silica flour compound, magnesite particulate are weighed by the weight ratio of above-mentioned compound and external feeding
Mixed, then add lignosulfonic acid magnesium solution, mixed, kneaded, 110~150MPa pressure machines pressure, drying process；
(4) material after step (3) processing is calcined 5~8 hours at 1670~1700 DEG C, obtains reheating material；By reheating
Material is broken, that is, obtains Midst density forsterite sand.
2. Midst density forsterite sand according to claim 1, it is characterised in that the body of the Midst density forsterite sand
Product density is 1.8~2.6g/cm3。
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| CN101565321B (en) * | 2009-06-16 | 2012-05-23 | 海城华宇耐火材料有限公司 | Method of producing forsterite refractory |
| CN102020474B (en) * | 2009-09-18 | 2013-03-13 | 鞍钢股份有限公司 | High temperature low heat conduction refractory material and production process thereof |
| CN102295293A (en) * | 2011-06-14 | 2011-12-28 | 辽宁科技大学 | Method for synthesizing high purity forsterite with mine tailings of magnesite and talcum |
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