CN103214250B - Recycling method for waste alumina brick - Google Patents
Recycling method for waste alumina brick Download PDFInfo
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- CN103214250B CN103214250B CN201210588267.8A CN201210588267A CN103214250B CN 103214250 B CN103214250 B CN 103214250B CN 201210588267 A CN201210588267 A CN 201210588267A CN 103214250 B CN103214250 B CN 103214250B
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- alumina
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Abstract
The invention discloses a recycling method for a waste alumina brick. The recycling method comprises removing impurities, mixing, pressing into balls, carrying out high temperature melting smelting, blowing the balls, sorting, carrying out chemical component blending, carrying out melting casting molding, and other processes, such that the Al2O3 component in the waste alumina brick after high temperature use can be reused.
Description
Technical field
The present invention relates to this industrial solid wastes of discarded alumina firebrick after applied at elevated temperature to recycle recycling, realize recycling of alumina resource.
Background technology
Because alumina firebrick has excellent fire performance, when high temperature kiln life cycle finishes, it is etched seldom, or does not corrode, and because it has passed through high temperature, tears kiln open and gets off to have become the fragment differing in size, and its main chemical composition is still aluminum oxide (Al
2o
3), be mixed with a small amount of impurity simultaneously.Because alumina resource is becoming scarce resource, therefore, tear the alumina brick that kiln gets off open and also there is very large value, continue the value of performance chemical composition wherein, it is carried out to second development and utilization, there is the meaning of saving resource, protection of the environment.
The invention discloses the rear discarded alumina brick recycling of a kind of use, manufacture the method for ball-aluminium oxide abrasive material and founding aluminium oxide refractory brick,, compacting balling-up, electric arc furnace high-temperature fusion mixing by mechanical disintegration and sorting, waste alumina brick particulate material and pitch bonding agent are smelted, are blown out the technology such as solid sphere, solid sphere sorting and produce alumina abrasive, and this is a kind of abrasive substance of spheroidal particle; And utilizing the solid sphere that sorting is got off to carry out the technology production fused cast aluminabricks such as chemical composition allotment, fusion-cast, this is a kind of senior castable refractory that can be used for building by laying bricks or stones the high temperature kilns such as glass furnace.
Summary of the invention
The object of the invention is to this industrial solid wastes of the discarded alumina firebrick after applied at elevated temperature (being called for short waste alumina refractory brick) to process, realize the comprehensive utilization of alumina resource, manufacture ball-aluminium oxide abrasive and founding aluminium oxide refractory brick.
For achieving the above object, the present invention can take following technological method:
The first step: the pre-treatment of waste alumina refractory brick:
The waste alumina refractory brick that the applied at elevated temperature of recovery is crossed, adopts the method for mechanical grinding, removes the impurity of its surface attachment; Adopt jaw crusher, oppositely rolling roller crusher by the waste alumina refractory brick fragmentation of reclaiming, sort out impurity, below the granularity 10mm of particulate material.
Second step: batching is with mixing
Proportion scale is that the useless brick particulate material of aluminum oxide accounts for 90%-95%, pitch bonding agent accounts for 5%-10%.Use, with the mixing machine of heating unit, first adds useless brick particulate material, then adds pitch bonding agent to carry out mixing.
The 3rd step: compacting balling-up
The material mixing is suppressed to balling-up with ball press, and the granularity of ball is 30mm left and right.Due to the useless brick particulate material of aluminum oxide sort out impurity, so only remaining a small amount of impurity is attached to particle surface, and impurity component mainly contains two kinds, and a kind of is silicon oxide (SiO2), another is the metals such as iron or its oxide compound that disintegrating apparatus grinding is got off, is all exogenous impurity.By mixing with pitch and suppress balling-up, make the pitch coated alumina brick particulate material of giving up, pitch fully contacts with the impurity adhering to, and the carbon and the impurity that are beneficial in pitch react.
The 4th step: high-temperature fusion is smelted
The mixing ball being pressed into of the particulate material of the waste alumina refractory brick that the 3rd step is obtained and pitch joins in electric arc furnace, carries out high-temperature fusion smelting.Electric arc furnace secondary voltage 120V-220V, secondary current 1000A-30000A during smelting; Smelting cycle 50-120 minute; SiO in particulate material
2be reduced into SiO, from stove, evaporate; Metallic impurity wherein, are deposited in furnace bottom; Wherein ferric oxide and silicon oxide are produced ferrosilicon in reduction situation, are deposited in furnace bottom; Na in furnace charge
2o, K
2the alkalimetal oxides such as O, under the high temperature action of electric arc, evaporate from stove.
The 5th step: blowing solid sphere
When a fusing end cycle, in stove, upper strata liquation has met smelting requirements, the body of heater that fascinates, and when liquation flows out converter nose, under the effect of High-Pressure Water, liquation is blown to hollow ball, the pressure of high pressure water: 0.4-0.8MPa.
The 6th step: the sorting of solid sphere
The solid sphere that upper step is obtained is dried, and then carries out sorting classifying, and the solid sphere that particle shape is complete, meet granularity requirements is for abrasive substance, and because this solid sphere is to have complete spheroidal particle, so it has special grinding effect.
The 7th step: solid sphere chemical composition allotment
The spherical incomplete aluminum oxide solid sphere that upper step sorting is got off carries out chemical composition allotment, proportion scale: solid sphere: 90%-70%; Commercial alumina: 10%-25%; Soda ash: below 10%; The chemical composition of admixtion is reached: Al
2o
3: 92%-99%; SiO
2≤ 0.5%; Na
2o:0.5%-7%.
The 5th step: fusion-cast moulding
This admixtion is added in electric arc furnace and melted, melting voltage: 120-240V, fusion current: 1000A-20000A, fusing cycle 40-120 minute, fusing is during end cycle, and liquation is cast in the model that refractory materials makes, adopt lagging material to casting mold insulation annealing, soaking time 15-20 days, then cuts processing to product, finally obtains meeting the founding aluminium oxide refractory brick of product standard.
embodiment:
Embodiment mono-:
1, by after the waste alumina brick labor cleaning after the use reclaiming, by jaw crusher, roller pair breaking crusher machine, sort out impurity, the granularity of the particulate material obtaining is below 10mm.
2, use the mixing machine with heating unit, Heating temperature is 80 ℃, according to proportion scale, is that the useless brick particulate material of aluminum oxide accounts for 90%, pitch bonding agent accounts for 10%, first adds useless brick particulate material, then adds pitch bonding agent to carry out mixing, mixing time 20-30 minute.
3, the material mixing is suppressed to balling-up with ball press, the granularity of ball is 30mm left and right.
4, the ball suppressing is added and in electric arc furnace, melt smelting.
Electrical parameter is smelted in fusing: secondary voltage is 150V-170V, and secondary current is 10000A, smelting cycle: 90 minutes.
5, when smelting cycle finishes, open the valve of high pressure water, the body of heater that fascinates, blows out solid sphere by the melt flowing out from converter nose, blows ball high pressure water pressure: 0.5MPa.
6, the ball of producing by boasting is dried, then solid sphere is carried out to sorting, spherical complete as abrasive ball, the ball that sorting is got off is for the production of fused cast aluminabrick.
7, the sorting aluminum oxide solid sphere that gets off is carried out to chemical composition allotment, add a small amount of commercial alumina, soda ash, ratio: in 1000kg admixtion: 700kg ball, 212kg commercial alumina, 88kg soda ash, reaches the chemical composition of admixtion: Al
2o
3: 95%; SiO
2≤ 0.6%; Na
2o:5%.
8, compound is joined in electric arc furnace and melted, control secondary voltage is 180V-220V; Secondary current 5000A-7000A, fusing time is 80-100 minute.
9, the liquation having melted is cast in the model combining in advance, model adopts emergy plate to make.
10, before casting, model is imbedded to insulation annealing in thermal insulation medium, thermal insulation medium is selected commercial alumina powder and alumina hollow ball, surrounding insulation layer thickness >=250 ㎜.Model after casting stops 15-20 days naturally, makes brick material realize insulation annealing.
11, the product for the treatment of insulation annealing drops to below 60 ℃, product can be taken out, and carries out removing surface, through after the assay was approved, by user's requirement, cuts processing and assembling etc.
Embodiment bis-:
The present embodiment and embodiment mono-process are basically identical, and the ratio of particulate material and pitch when its key distinction is mixing, some parameters are had any different while smelting, and technology controlling and process slightly adjusts:
1, by after the waste alumina brick labor cleaning after the use reclaiming, by jaw crusher, roller pair breaking crusher machine, sort out impurity, the granularity of the particulate material obtaining is below 10mm.
2, use the mixing machine with heating unit, Heating temperature is 80 ℃, according to proportion scale, is that the useless brick particulate material of aluminum oxide accounts for 95%, pitch bonding agent accounts for 5%, first adds useless brick particulate material, then adds pitch bonding agent to carry out mixing, mixing time 20-30 minute.
3, the material mixing is suppressed to balling-up with ball press, the granularity of ball is 30mm left and right.
4, the ball suppressing is added and in electric arc furnace, melt smelting.
Electrical parameter is smelted in fusing: secondary voltage is 140V-160V, and secondary current is 12000A, smelting cycle: 70 minutes.
5, when smelting cycle finishes, open high pressure water valve, the body of heater that fascinates, blows out solid sphere by the melt flowing out from converter nose, blows ball compressed air pressure: 0.8MPa.
6, the ball of producing by boasting is dried, then solid sphere is carried out to sorting, spherical complete as abrasive ball, the ball that sorting is got off is for the production of fused cast aluminabrick.
7, the aluminum oxide solid sphere minute sorting being got off carries out chemical composition allotment, adds a small amount of commercial alumina, soda ash, concrete ratio: in 1000kg admixtion: 600kg ball, and 320kg commercial alumina, 80kg soda ash, reaches the chemical composition of admixtion: Al
2o
3: 95%; SiO
2≤ 0.6%; Na
2o:5%.
8, compound is joined in electric arc furnace and melted, control secondary voltage is 190V-210V, electric current 5000A-7000A, and fusing time is 90-110 minute.
9, the liquation having melted is cast in the model combining in advance, model adopts emergy plate to make.
10, before casting, model is imbedded to insulation annealing in thermal insulation medium, thermal insulation medium is selected commercial alumina powder and alumina hollow ball, surrounding insulation layer thickness >=250 ㎜.Model after casting stops 15-20 days naturally, makes brick material realize insulation annealing.
11, the product for the treatment of insulation annealing drops to below 60 ℃, product can be taken out, and carries out removing surface, through after the assay was approved, by user's requirement, cuts processing and assembling etc.
Finally it should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. by a recycling method for rear discarded alumina brick, it is characterized in that:
The pre-treatment of step 1, waste alumina brick: the waste alumina refractory brick that the applied at elevated temperature that reclaims of take is crossed is raw material, removes the impurity of waste alumina refractory brick surface attachment, is broken for the particulate material below 10mm; Adopt the impurity of the method removing waste alumina refractory brick surface attachment of mechanical grinding; Then adopt jaw crusher, oppositely rolling roller crusher that the waste alumina refractory brick of recovery is carried out to fragmentation;
Step 2, particulate material and pitch bonding agent is mixing, proportion scale is that the useless brick particulate material of aluminum oxide accounts for 90%-95%, pitch bonding agent accounts for 5%-10%, is pressed into subsequently the ball of 30mm left and right; Use, with the mixing machine of heating unit, first adds useless brick particulate material, then adds pitch bonding agent to carry out mixing, suppresses subsequently balling-up;
Step 3, the particulate material of waste alumina brick that upper step is obtained and the ball of the mixing rear compacting of pitch join in electric arc furnace, carry out high-temperature fusion smelting, during smelting, electric arc furnace secondary voltage is that 110V-220V, secondary current are 1000A-30000A, and smelting cycle is 50-120 minute;
Step 4, when a fusing is during end cycle, the body of heater that fascinates, under the effect of High-Pressure Water, blows out solid sphere by liquation, the pressure of High-Pressure Water is 0.4-0.8MPa;
Step 5, solid sphere is dried and carry out sorting, spherical complete ball is as abrasive;
Step 6, the aluminum oxide solid sphere that sorting is got off carry out chemical composition allotment, proportion scale: solid sphere: 90%-70%; Commercial alumina: 10%-25%; Soda ash :≤10%; The chemical composition of admixtion is reached: Al2O3:92%-99%; SiO2≤0.6%; Na2O:0.5%-7%;
Step 7, fusing cast molding: deployed admixtion is added in electric arc furnace and melted, melting voltage is 120-240V, fusion current is 1000A-20000A, the fusing cycle is 40-120 minute, and fusing is during end cycle, and liquation is cast in the model that refractory materials makes, adopt lagging material to casting mold insulation annealing, soaking time 10-20 days, then cuts processing to product, finally obtains founding aluminium oxide refractory brick;
In described step 6, the sorting aluminum oxide solid sphere that gets off is carried out to chemical composition allotment, add a small amount of commercial alumina, soda ash, ratio is: in 1000kg admixtion: 600-700kg ball, 212-320kg commercial alumina, 80-88kg soda ash, reaches the chemical composition of admixtion: Al2O3:95%; SiO2≤0.6%; Na2O:5%.
2. the recycling method of the rear discarded alumina brick of a kind of use according to claim 1, is characterized in that: in step 3, electrical parameter is smelted in fusing: secondary voltage is 150V-170V, and secondary current is 10000A, and smelting cycle is 90 minutes.
3. the recycling method of the rear discarded alumina brick of a kind of use according to claim 1, is characterized in that: in step 4, when a fusing end cycle, the body of heater that fascinates, under the effect of High-Pressure Water, blows out solid sphere by liquation.
4. the recycling method of the rear discarded alumina brick of a kind of use according to claim 1, is characterized in that: in step 5, solid sphere is dried and carry out sorting, spherical complete ball is as abrasive.
5. the recycling method of the rear discarded alumina brick of a kind of use according to claim 1, is characterized in that: in step 7, described secondary voltage is 180V-220V; Secondary current 5000A-7000A, fusing time is 80-110 minute; Described model adopts emergy plate to make, before casting, model is imbedded to insulation annealing in thermal insulation medium, thermal insulation medium is selected commercial alumina powder and alumina hollow ball, surrounding insulation layer thickness >=250 ㎜, model after casting stops 15-20 days naturally, makes brick material realize insulation annealing, treats that the product of insulation annealing drops to below 60 ℃, product can be taken out, carry out removing surface, through after the assay was approved, by user's requirement, cut processing and assembling.
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| CN103570369B (en) * | 2013-11-07 | 2015-01-28 | 长兴云峰炉料有限公司 | Making method of main channel castable of blast furnace |
| CN104446545A (en) * | 2014-11-25 | 2015-03-25 | 淄博旭硝子刚玉材料有限公司 | Fusing refractory material damper block and preparation method thereof |
| CN109732747B (en) * | 2018-12-13 | 2020-12-22 | 安徽南大星新材料科技有限公司 | Production and processing technology of novel material refractory plate |
| CN109942306A (en) * | 2019-03-28 | 2019-06-28 | 江苏悦展新型材料有限公司 | A kind of method of Novel fireproof brick recycling and its reworked material application |
| CN110922198A (en) * | 2019-12-16 | 2020-03-27 | 安徽工业大学 | Method for regenerating aluminum-silicon waste refractory aggregate |
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| CN101792317B (en) * | 2010-03-09 | 2012-12-19 | 浙江大学 | Method for producing high-strength alumina hollow spheres |
| CN102241520B (en) * | 2010-05-13 | 2013-06-12 | 郑州振中电熔新材料有限公司 | Method for melting and casting alpha alumina product |
| CN102249716A (en) * | 2011-05-31 | 2011-11-23 | 傅晓云 | High-temperature resistant hollow spheres and preparation method thereof |
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