CN103755369B - Method for producing aluminum silicon carbide bricks from waste refractory materials - Google Patents
Method for producing aluminum silicon carbide bricks from waste refractory materials Download PDFInfo
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Abstract
The invention discloses a method for producing aluminum silicon carbide bricks from waste refractory materials. The method comprises steps of selecting materials, breaking, removing iron from broken powder, grinding powder, batching, proportioning, mixing and milling, shaping, inspecting, drying, loading to a kiln, sintering, radiating heat, cooling and the like, thus obtaining the aluminum silicon carbide bricks. The method disclosed by the invention not only solves a problem of waste refractory material landfill which occupies land and saves resource, but also improves environmental protection; simultaneously, the method avoids damage of radioactive or carcinogenic substances on soil quality in case of weathering and raining.
Description
Technical field
The invention belongs to waste and scrap recycling field, particularly a kind of method utilizing waste and old refractory materials to produce aluminum silicon carbide brick.
Background technology
Closely several come Mineral resources by national environmental protection policy control with restriction, refractory raw material day by day tightly rise in price lattice constantly rises.
From the resource of refractory materials, China refractory raw material mineral reserve reserves reduce, and the Yangquan Shanxi that bauxite ore reserves reach 1.2 hundred million tons is through the exploitation of last 100 years, and the good bauxitic clay mineral reserve of grade are on the verge of exhaustion.Shandong Province's flint clay well-known then, because produced quantity is large and of the remote past, has and changes the line of production and the restructuring that goes bankrupt as Boshan bauxite, big vast mountain bauxite close hole the nineties in last century in succession.Also excessively long-term just like magnesia fireproof Raw Ore Tibetan Scripture exploitation, main ore deposit and concentrate region all gradually reduce, and what have now to go underground exploitation from strip mining transformation.In addition, the little ore deposit wasted because of exploitation lack of standardization every year, ore deposit, corner are rolling up, and make resource serious waste.In the face of mining deposits reduces year by year, the phenomenon of resource serious waste, economizes on resources, utilize resources synthetically has been the task of top priority.
In prior art, to the process mainly landfill of waste and old refractory materials, not only occupy soil, through weathering and the waste refractory materials that drenches with rain, easily cause the destruction of soil soil property, and some waste and old refractory materials can carcinogenic (as Cr2O3-containing refractories), there is radioactivity (as containing Zr refractory material).Along with China is to the propelling of recycling economy, the strategy of sustainable development, to using the research and development recycling dynamics of rear waste and old refractory materials also to need to increase gradually, and to hi-tech, high technical additional value future development.
Therefore, to the comprehensive utilization of fire-resistant resource, limited resources is played and acts on to greatest extent, realizing Sustainable development, is the needs of social development, is a kind of inevitable.
Summary of the invention
For prior art Problems existing, the present invention aims to provide a kind of method utilizing waste and old refractory materials production aluminum silicon carbide brick economizing on resources, improve environmental protection.
The invention provides a kind of method utilizing waste and old refractory materials to produce aluminum silicon carbide brick, comprise the following steps:
S1, to select materials: select the waste and old high alumina brick of satisfactory blast furnace, ceramic industry gives up silicon carbide deck, ooze and useless first-class high alumina brick;
S2, fragmentation: above-mentioned raw materials is put into roller machine broken, and particle out broken in roller machine is crossed 6 order vibratory screening apparatuss, the particle of its granularity requirements particle diameter > 5mm should be less than and equals 10% of whole particle, and the particle of particle diameter <0.5mm should be less than and equals 20% of whole particle;
S3, flour deironing: bulk material, after fragmentation is sieved, the chute and lower powder groove of belt fortune Ke machine should be set up permanent magnet respectively, to remove irony, require within every 20 minutes, get iron once;
S4, abrasive dust: adopt Raymond mill mill to get fine powder, must feed in raw material evenly, and control feed rate, rotation speed of fan well, and regulate horizontal screen rotating speed, powder particles should reach≤powder >=90% of 0.088mm;
S5, batching: the first good platform scale in school before batching, various raw material weighing error must not more than 3%;
S6, proportioning: the weight percent of each composition and composition is the waste and old high alumina brick of 6 order one-level alumina 30%, 6 order 30%, carborundum plate fine powder 12%, 180 order alumina fine powder 23%, 180 order ooze powder 5%, wooden calcium liquid 4% ~ 4.5%;
S7, mixed grind: first various particles of aggregates material is added in planetary mixer, mixed grind is while add wooden calcium liquid, and by wetting of particulates, then add fine powder, the mixed grind time is no less than 10 minutes;
S8, shaping: to adopt 400 tons of friction presses shaping, the volume density controlling adobe is 2.9g/cm3;
S9, inspection: adobe void content answers≤19%; The error of size≤200mm is ± 1mm, and the error of size >=200mm is ± 2mm; Distortion≤0.5mm; Same size relative deviation answers≤1.0mm; Depth of the damage edge≤3.0mm, length is≤60mm, depth of the damaged vertex≤3.0mm; Overlap needs floating and thickness answers≤1.0mm; Do not allow to there is crackle, slabbing and pitted skin;
S10, drying: the method taking seasoning, dry place is smooth, it is spread the quartz sand of thickness G reatT.GreaT.GT10mm and strikes off, and stacks bricks and must handle with care, and stacking bricks height must not more than 1.2m, treats that remaining moisture content≤2% of adobe can loading of kiln;
S11, loading of kiln: the loading of kiln mode adopting side dress, accomplish that limit is rare in close, upper close lower rare, the spacing of each piled bricks is 80 ~ 100mm, and piled bricks and kiln lateral extent are 150 ~ 200mm, with kiln apex distance from being 100 ~ 150mm; The spacing of kiln top brick and brick is 15 ~ 20mm, and top is 20 ~ 25mm, and bottom is 25 ~ 30mm; And in adobe, requirement sprinkles the flint clay powder of particle diameter≤2mm and strikes off, and will sprinkle the chaff shell preventing sticky brick between adobe and adobe; Just staying wicket medullary ray and seeing quirk together, is highly 0.8 ~ 1.0m, is respectively that each one of thermal wedge should be put in 1.2 ~ 1.4m place apart from 2 wickets; Wicket divides inside and outside two-layer closed, and centre stays the space of about 100mm for heat insulation, just to seeing that quirk stays observation thermometer hole;
S12, to burn till: being warming up to kiln temperature from lighting a fire to is 1500 DEG C, accumulative is 123 hours often; Frequent observation kiln temperature situation, can be incubated, be incubated fire of can stopping after 8 hours after fire cone is curved; Flue shutter all puts down rear half an hour by fire of stopping;
S13, heat radiation and cooling: fire of stopping opens kiln top louvre in latter 16 hours, and push outer wicket aside, open 1/3 wicket after 24 hours, open whole wicket, mention flue shutter after 40 hours, push fire-box cover plate aside, air blast is cooled to normal temperature;
Preferably, step S1 gets the raw materials ready and comprises:
Picking of S101, waste and old refractory materials: the waste and old silicon carbide deck of Ceramics industry, by iron knurl, that coal melts the impurity blankings such as knurl, Wingdale and underburnt material is clean;
Picking of S102, casket sand: require that quality is good, can not the fragments such as ceramics be had;
Picking of S103, ooze: require that impurity is little, matter is pure, and clay is good;
Picking of S104, useless first-class high alumina brick: require that quality is pure, volume density large, need the clean low-level useless brick of blanking and impurity.
Preferably, in step S4, the rotating speed of horizontal screen must not be less than 600 revs/min.
Preferably, require in step S9 by the first slow method operation come back of light rear pressure.
Preferably, in step S7 mixed grind to pug granularity and moisture requirement as follows:
Granularity >5mm, moisture requirement≤10%;
Granularity is 5 ~ 3mm, and moisture requirement is 20 ~ 30%;
Granularity is 3 ~ 1mm, and moisture requirement is 20 ~ 30%;
Granularity≤0.1mm, moisture requirement is 35 ~ 45%;
Pug moisture content is 5.0 ~ 5.5%.
Preferably, in step S7 mixed grind, the proportion of lignin sulfonic acid calcium solution is 1.18 ~ 1.25g/cm
3.
Preferably, described step S12 burns till and comprises:
Light a fire-be warming up to 200 DEG C: heat-up rate is 5 DEG C/h, spend 36 hours;
200 DEG C are incubated 12 hours;
200 ~ 800 DEG C: heat-up rate is 25 DEG C/h, spend 24 hours;
800 ~ 1200 DEG C: heat-up rate is 20 DEG C/h, spend 20 hours;
1200 ~ 1400 DEG C: heat-up rate is 15 DEG C/h, spend 13 hours;
1400 ~ 1500 DEG C: heat-up rate is 10 DEG C/h, spend 10 hours;
1500 DEG C are incubated 8 hours.
The soil that the described method utilizing waste and old refractory materials to produce aluminum silicon carbide brick provided by the invention takies by utilizing waste and old high alumina brick silicon carbide brick production aluminum silicon carbide brick to not only solve waste and old refractory materials landfill, save resource, further improve environmental protection, processed simultaneously and there are radioactivity or carcinogenic article through weathering and the destruction of causing soil soil property that drenches with rain.
Embodiment
Technical scheme of the present invention is further illustrated below by embodiment:
The invention provides a kind of method utilizing waste and old refractory materials to produce aluminum silicon carbide brick, comprise the following steps:
S1, to select materials: select the waste and old high alumina brick of satisfactory blast furnace, ceramic industry gives up silicon carbide deck, ooze and useless first-class high alumina brick;
S2, fragmentation: above-mentioned raw materials is put into roller machine broken, and particle out broken in roller machine is crossed 6 order vibratory screening apparatuss, the particle of its granularity requirements particle diameter > 5mm should be less than and equals 10% of whole particle, and the particle of particle diameter <0.5mm should be less than and equals 20% of whole particle;
S3, flour deironing: bulk material, after fragmentation is sieved, the chute and lower powder groove of belt fortune Ke machine should be set up permanent magnet respectively, to remove irony, require within every 20 minutes, get iron once;
S4, abrasive dust: adopt Raymond mill mill to get fine powder, must feed in raw material evenly, and control feed rate, rotation speed of fan well, and regulate horizontal screen rotating speed, powder particles should reach≤powder >=90% of 0.088mm;
S5, batching: the first good platform scale in school before batching, various raw material weighing error must not more than 3%;
S6, proportioning: the weight percent of each composition and composition is the waste and old high alumina brick of 6 order one-level alumina 30%, 6 order 30%, carborundum plate fine powder 12%, 180 order alumina fine powder 23%, 180 order ooze powder 5%, wooden calcium liquid 4% ~ 4.5%;
S7, mixed grind: first various particles of aggregates material is added in planetary mixer, mixed grind is while add wooden calcium liquid, and by wetting of particulates, then add fine powder, the mixed grind time is no less than 10 minutes;
S8, shaping: to adopt 400 tons of friction presses shaping, the volume density controlling adobe is 2.9g/cm3;
S9, inspection: adobe void content answers≤19%; The error of size≤200mm is ± 1mm, and the error of size >=200mm is ± 2mm; Distortion≤0.5mm; Same size relative deviation answers≤1.0mm; Depth of the damage edge≤3.0mm, length is≤60mm, depth of the damaged vertex≤3.0mm; Overlap needs floating and thickness answers≤1.0mm; Do not allow to there is crackle, slabbing and pitted skin;
S10, drying: the method taking seasoning, dry place is smooth, it is spread the quartz sand of thickness G reatT.GreaT.GT10mm and strikes off, and stacks bricks and must handle with care, and stacking bricks height must not more than 1.2m, treats that remaining moisture content≤2% of adobe can loading of kiln;
S11, loading of kiln: the loading of kiln mode adopting side dress, accomplish that limit is rare in close, upper close lower rare, the spacing of each piled bricks is 80 ~ 100mm, and piled bricks and kiln lateral extent are 150 ~ 200mm, with kiln apex distance from being 100 ~ 150mm; The spacing of kiln top brick and brick is 15 ~ 20mm, and top is 20 ~ 25mm, and bottom is 25 ~ 30mm; And in adobe, requirement sprinkles the flint clay powder of particle diameter≤2mm and strikes off, and will sprinkle the chaff shell preventing sticky brick between adobe and adobe; Just staying wicket medullary ray and seeing quirk together, is highly 0.8 ~ 1.0m, is respectively that each one of thermal wedge should be put in 1.2 ~ 1.4m place apart from 2 wickets; Wicket divides inside and outside two-layer closed, and centre stays the space of about 100mm for heat insulation, just to seeing that quirk stays observation thermometer hole;
S12, to burn till: being warming up to kiln temperature from lighting a fire to is 1500 DEG C, accumulative is 123 hours often; Frequent observation kiln temperature situation, can be incubated, be incubated fire of can stopping after 8 hours after fire cone is curved; Flue shutter all puts down rear half an hour by fire of stopping;
S13, heat radiation and cooling: fire of stopping opens kiln top louvre in latter 16 hours, and push outer wicket aside, open 1/3 wicket after 24 hours, open whole wicket, mention flue shutter after 40 hours, push fire-box cover plate aside, air blast is cooled to normal temperature;
Step S1 gets the raw materials ready and comprises:
Picking of S101, waste and old refractory materials: the waste and old silicon carbide deck of Ceramics industry, by iron knurl, that coal melts the impurity blankings such as knurl, Wingdale and underburnt material is clean;
Picking of S102, casket sand: require that quality is good, can not the fragments such as ceramics be had;
Picking of S103, ooze: require that impurity is little, matter is pure, and clay is good;
Picking of S104, useless first-class high alumina brick: require that quality is pure, volume density large, need the clean low-level useless brick of blanking and impurity.
In step S4, the rotating speed of horizontal screen must not be less than 600 revs/min.
Require in step S9 by the first slow method operation come back of light rear pressure.
In step S7 mixed grind to pug granularity and moisture requirement as follows:
Granularity >5mm, moisture requirement≤10%;
Granularity is 5 ~ 3mm, and moisture requirement is 20 ~ 30%;
Granularity is 3 ~ 1mm, and moisture requirement is 20 ~ 30%;
Granularity≤0.1mm, moisture requirement is 35 ~ 45%;
Pug moisture content is 5.0 ~ 5.5%.
In described step S7 mixed grind, the proportion of lignin sulfonic acid calcium solution is 1.18 ~ 1.25g/cm
3.
Described step S12 burns till and comprises:
Light a fire-be warming up to 200 DEG C: heat-up rate is 5 DEG C/h, spend 36 hours;
200 DEG C are incubated 12 hours;
200 ~ 800 DEG C: heat-up rate is 25 DEG C/h, spend 24 hours;
800 ~ 1200 DEG C: heat-up rate is 20 DEG C/h, spend 20 hours;
1200 ~ 1400 DEG C: heat-up rate is 15 DEG C/h, spend 13 hours;
1400 ~ 1500 DEG C: heat-up rate is 10 DEG C/h, spend 10 hours;
1500 DEG C are incubated 8 hours.
The soil that the described method utilizing waste and old refractory materials to produce aluminum silicon carbide brick provided by the invention takies by utilizing waste and old high alumina brick silicon carbide brick production aluminum silicon carbide brick to not only solve waste and old refractory materials landfill, save resource, further improve environmental protection, processed simultaneously and there are radioactivity or carcinogenic article through weathering and the destruction of causing soil soil property that drenches with rain.
Above to invention has been exemplary description; obvious realization of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that technical solution of the present invention is carried out; or design of the present invention and technical scheme directly applied to other occasion, all in protection scope of the present invention without to improve.
Claims (6)
1. utilize waste and old refractory materials to produce a method for aluminum silicon carbide brick, it is characterized in that, comprise the following steps:
S1, to select materials: select the waste and old high alumina brick of satisfactory blast furnace, ceramic industry gives up silicon carbide deck, casket sand, ooze and useless first-class high alumina brick;
S2, fragmentation: above-mentioned raw materials is put into roller machine broken, and particle out broken in roller machine is crossed 6 order vibratory screening apparatuss, the particle of its granularity requirements particle diameter > 5mm should be less than and equals 10% of whole particle, and the particle of particle diameter <0.5mm should be less than and equals 20% of whole particle;
S3, flour deironing: bulk material, after fragmentation is sieved, the chute and lower powder groove of rotary conveyor should set up permanent magnet respectively, to remove irony, requires within every 20 minutes, get iron once;
S4, abrasive dust: adopt Raymond mill mill to get fine powder, must feed in raw material evenly, and control feed rate, rotation speed of fan well, and regulate horizontal screen rotating speed, powder particles should reach≤powder >=90% of 0.088mm;
S5, batching: the first good platform scale in school before batching, various raw material weighing error must not more than 3%;
S6, proportioning: the weight percent of each composition and composition is the waste and old high alumina brick 30% of 6 order one-level alumina 30%, 6 order, silicon carbide deck fine powder 12%, 180 order alumina fine powder 23%, 180 order ooze powder 5%; Additional lignin sulfonic acid calcium solution 4% ~ 4.5%;
S7, mixed grind: first various particles of aggregates material is added in planetary mixer, mixed grind, while add lignin sulfonic acid calcium solution, by wetting of particulates, then adds fine powder, and the mixed grind time is no less than 10 minutes;
S8, shaping: to adopt 400 tons of friction presses shaping, the volume density controlling adobe is 2.9g/cm
3;
S9, inspection: adobe void content answers≤19%; The error of size≤200mm is ± 1mm, and the error of size >=200mm is ± 2mm; Distortion≤0.5mm; Same size relative deviation answers≤1.0mm; Depth of the damage edge≤3.0mm, length is≤60mm, depth of the damaged vertex≤3.0mm; Overlap needs floating and thickness answers≤1.0mm; Do not allow to there is crackle, slabbing and pitted skin;
S10, drying: the method taking seasoning, dry place is smooth, it is spread the quartz sand of thickness G reatT.GreaT.GT10mm and strikes off, and stacks bricks and must handle with care, and stacking bricks height must not more than 1.2m, treats that remaining moisture content≤2% of adobe can loading of kiln;
S11, loading of kiln: the loading of kiln mode adopting side dress, accomplish that limit is rare in close, upper close lower rare, the spacing of each piled bricks is 80 ~ 100mm, and piled bricks and kiln lateral extent are 150 ~ 200mm, with kiln apex distance from being 100 ~ 150mm; The spacing of kiln top brick and brick is 15 ~ 20mm, and top is 20 ~ 25mm, and bottom is 25 ~ 30mm; And in adobe, requirement sprinkles the flint clay powder of particle diameter≤2mm and strikes off, and will sprinkle the chaff shell preventing sticky brick between adobe and adobe; Just staying wicket medullary ray and seeing quirk together, is highly 0.8 ~ 1.0m, is respectively that each one of thermal wedge should be put in 1.2 ~ 1.4m place apart from 2 wickets; Wicket divides inside and outside two-layer closed, and centre stays the space of 100mm for heat insulation, just to seeing that quirk stays observation thermometer hole;
S12, to burn till: being warming up to kiln temperature from lighting a fire to is 1500 DEG C, accumulative is 123 hours often; Frequent observation kiln temperature situation, can be incubated, be incubated fire of can stopping after 8 hours after fire cone is curved; Flue shutter all puts down rear half an hour by fire of stopping;
S13, heat radiation and cooling: fire of stopping opens kiln top louvre in latter 16 hours, and push outer wicket aside, open 1/3 wicket after 24 hours, open whole wicket, mention flue shutter after 40 hours, push fire-box cover plate aside, air blast is cooled to normal temperature.
2. a kind of method utilizing waste and old refractory materials to produce aluminum silicon carbide brick according to claim 1, it is characterized in that, step S1 selects materials and comprises:
Picking of S101, waste and old refractory materials: the waste and old silicon carbide deck of Ceramics industry, by iron knurl, that coal melts knurl, Wingdale and the blanking of underburnt material is clean;
Picking of S102, casket sand: require that quality is good, ceramics fragment can not be had;
Picking of S103, ooze: require that impurity is little, matter is pure, and clay is good;
Picking of S104, useless first-class high alumina brick: require that quality is pure, volume density large, need the clean low-level useless brick of blanking and impurity.
3. a kind of method utilizing waste and old refractory materials to produce aluminum silicon carbide brick according to claim 1, it is characterized in that, in step S4, the rotating speed of horizontal screen must not be less than 600 revs/min.
4. a kind of method utilizing waste and old refractory materials production aluminum silicon carbide brick according to claim 1, is characterized in that, requires by the first slow method operation come back of light rear pressure in step S9.
5. a kind of method utilizing waste and old refractory materials to produce aluminum silicon carbide brick according to claim 1, it is characterized in that, in step S7 mixed grind, the proportion of lignin sulfonic acid calcium solution is 1.18 ~ 1.25g/cm
3.
6. a kind of method utilizing waste and old refractory materials to produce aluminum silicon carbide brick according to claim 1, it is characterized in that, described step S12 burns till and comprises:
Light a fire-be warming up to 200 DEG C: heat-up rate is 5 DEG C/h, spend 36 hours;
200 DEG C are incubated 12 hours;
200 ~ 800 DEG C: heat-up rate is 25 DEG C/h, spend 24 hours;
800 ~ 1200 DEG C: heat-up rate is 20 DEG C/h, spend 20 hours;
1200 ~ 1400 DEG C: heat-up rate is 15 DEG C/h, spend 13 hours;
1400 ~ 1500 DEG C: heat-up rate is 10 DEG C/h, spend 10 hours;
1500 DEG C are incubated 8 hours.
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| CN107188574A (en) * | 2017-05-27 | 2017-09-22 | 长沙湘宁耐火材料有限公司 | A kind of method for producing non-ferrous smelting furnace and push pedal used for industrial furnace |
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