CN101768005A - Light high-alumina insulating firebrick and preparation method thereof - Google Patents
Light high-alumina insulating firebrick and preparation method thereof Download PDFInfo
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- CN101768005A CN101768005A CN201010100809A CN201010100809A CN101768005A CN 101768005 A CN101768005 A CN 101768005A CN 201010100809 A CN201010100809 A CN 201010100809A CN 201010100809 A CN201010100809 A CN 201010100809A CN 101768005 A CN101768005 A CN 101768005A
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Abstract
The invention discloses a light high-alumina insulating firebrick and a preparation method thereof used for insulating layers of thermal equipment. The firebrick comprises the raw materials in percent by weight: 40% to 60% of high-alumina bauxite clinker and 40% to 60% of binder, polymeric light ball and sawdust respectively account 0.5% to 1.5% and10% to 15% of the total weight of the high-alumina bauxite clinker and the binder and are also added. The preparation method comprises the steps of: mixing the high-alumina bauxite clinker with the binder; then adding the polymeric light ball and the sawdust; adding water with the proportion of the dry mixed powder and the water of 1.0 to 1.75: 1; stirring into slurry-shaped materials; casting into brick blanks; drying; filling into a kiln; heating to 1270 DEG C to 1350 DEG C; and keeping the temperature for preparing the firebrick by burning. The firebrick has the advantages of simple formulation, easy acquirement of the raw materials, good compatibility, high compressive strength, low thermal conductivity, low change rate of high-temperature heavy firing line and the like, and achieves the national standards of relative products. The firebrick has simple preparation method and lower cost, can be used for the insulating layers and fireproof layers of all kinds of thermal equipment, and is beneficial to popularization and application.
Description
One, technical field:
The present invention relates to a kind of light fire brick, particularly relate to a kind of Thermal Equipment thermofin light high-alumina insulating firebrick and preparation method thereof.
Two, background technology:
Energy scarcity in the world wide, various Thermal Equipments are the critical facilitys in the industrial production, it also is major power consumer, therefore, the flame retardant coating of various Thermal Equipments and thermofin require insulation, fire-resistant, heat insulation, are that the Thermal Equipment long-term safety is used, saving energy and reduce the cost obtains the more assurance of large economy benefit.Heat insulation, the thermal insulation fire-resistant brick of present various materials adopt substantially: (1) adds combustiblematerials, as plant saw foam, poly-light ball; (2) low density, low refractoriness light material are as fine perlite, closed perlite.Yet add the high temperature use properties such as whole refractoriness, line velocity of variation that the low density light material tends to destroy product in large quantities, do not reach the related products request of national standard, thereby reduce the work-ing life of Industrial Stoves, when serious even cause the generation of industrial accident.
Application number is the prescription that 200810015228.2 patent application discloses a kind of mullite light heat insulating brick, and its component comprises Zhanjiang soil, kyanite, sillimanite, Calcined polishing aluminum oxide, same model waste product feed back, adds poly-light ball of EPS and sawdust again.Compressive strength is higher by about 10% than like product under this product equal volume density, more helps the stable of technological process control and quality product than other prescriptions.But this formula for a product relative complex, raw materials cost is higher, and performance is general, and cost performance of product is lower.
Three, summary of the invention:
The technical problem to be solved in the present invention: be to provide a kind of compressive strength height, thermal conductivity is low, the line velocity of variation is low, production cost is low light high-alumina insulating firebrick and preparation method thereof.
Technical scheme of the present invention:
A kind of light high-alumina insulating firebrick is represented with weight percent, and raw material is a bauxite chamotte 40～60%, and binding agent 40～60% adds poly-light ball that accounts for above-mentioned raw materials gross weight 0.5-1.5% and the sawdust that accounts for above-mentioned raw materials gross weight 10-15%.
Alumina content is 50～88% in the described bauxite chamotte, and granularity is 200～325 orders.
Described binding agent is kaolin or alumine cement, and granularity is 200～325 orders; Described poly-light ball unit weight is 15～20kg/m
3Described sawdust sieves with 14 purpose screen clothes before using.
Described poly-light ball consumption is preferably 0.8～1.2%, and described sawdust consumption is preferably 12～14%.
A kind of preparation method of light high-alumina insulating firebrick comprises taking by weighing raw material, batch mixing, moulding, drying and step such as burning till, and specifically is that bauxite chamotte, two kinds of dry powder of binding agent are mixed in proportion; Add poly-light ball and sawdust then, mix; Add entry, the weight ratio of dry powder blend material and water is 1.0～1.75: 1, makes the muddy material through stirring; Inject mould then and pour into adobe, with brick bat drying, the kiln of packing into then; Be heated to 1270～1350 ℃ from normal temperature again, under this temperature, be incubated 6～8h, burn till.
Described brick bat drying divides two sections, and first section is demoulding drying, and drying temperature is 40～60 ℃, and be 16～24h time of drying; Second section is forced drying, and drying temperature is 80～120 ℃, and be 12～18h time of drying, and the moisture weight percent content is controlled at below 6% in the dry back adobe.
Described adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 32～48h.
The performance requriements of raw material:
1, the performance requriements of bauxite chamotte:
| ??Al 2O 3(％) | ??Fe 2O 3(％) | Refractoriness (℃) | Volume density, g/cm 3 |
| ??50～88 | ??≤2.0 | ??≥1790 | ??≥2.75 |
2, kaolinic performance requriements:
| ??Al 2O 3(％) | ??Fe 2O 3(％) | Refractoriness (℃) | Igloss (%) | Plasticity- |
| ??≥38 | ??≤2.0 | ??≥1670 | ??≤17 | ??≥3.0 |
3, the performance requriements of alumine cement:
| ??Al 2O 3(％) | ??SiO 2(％) | ??Fe 2O 3(％) | ??Na 2O+K 2O(％) | ??S(％) | Igloss (%) |
| ??50～77 | ??≤8.0 | ??≤2.5 | ??≤0.4 | ??≤0.1 | ??≤0.1 |
Positive beneficial effect of the present invention:
(1) light high-alumina insulating firebrick of the present invention, prescription is simple, raw material is easy to get, compatibleness is good, product has advantages such as compressive strength height, thermal conductivity is low, the high temperature reheating linear change rate on reheating is low, and product performance have reached the national standard (high alumina matter insulating fire brick GB/T3995-1983) of related products.Specific performance sees Table 1.
Performance perameter in the table 1 is the representative value of product of the present invention, can reach the different performance requriements of user by the optimization proportioning of raw material.
Table 1: the performance index of light high-alumina insulating firebrick of the present invention
(2) the two-stage method drying is adopted in adobe in the method for the present invention when drying, elder generation's demoulding drying, this stage adobe moisture is big, need the control bake out temperature, prevent the rapid discharge of moisture and cause adobe crackle to occur, forced drying then, control base substrate moisture reaches requirement, with the quality of product behind the assurance sintering.
(3) method of the present invention is simple, and cost is lower, and product performance are good, and the light fire brick of production can be used for various Thermal Equipment thermofins, flame retardant coating, reaches energy-conservation, fireproof dual function, helps applying.
Four, embodiment:
Further specify the present invention below for example, each material performance will be asked for an interview to the technical scheme part, and the raw material consumption is calculated by weight percentage, can specifically adjust proportioning and production method according to the performance of customer requirements.
Embodiment 1: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing by weight percentage that alumine who knows 60%, binding agent kaolin 40%, more than two kinds of raw materials be dry powder, granularity is 200～325 orders, above-mentioned raw materials is added in the forced stirrer mix, and stirs 5-6 minute; Add the poly-light ball that accounts for above-mentioned raw materials gross weight 0.5% and 10% sawdust then, restir 5-6 minute, wherein sawdust sieved with 14 purpose screen clothes before using; Add water in proportion and stir, the weight ratio of dry powder blend material and water is 1.75: 1, and churning time is 5-6 minute, stirs into the muddy material, injects mould then, pours into adobe;
Divide two sections to carry out drying adobe, first section is demoulding drying, and drying temperature is 40～60 ℃, and be 16～24h time of drying; Second section is forced drying, and drying temperature is 80～120 ℃, and be 12～18h time of drying, and dry back adobe moisture mass content is controlled at below 6%; With the exsiccant adobe kiln of packing into, be heated to 1270～1350 ℃ from normal temperature, insulation 6～8h burns till kiln discharge behind the product furnace cooling.Adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 32～48h.
Behind the product kiln discharge, its physicochemical property, surface quality and physical dimension are tested; Block, assembling are ground by dimensional standard or contract requirement in qualified back; With packing of product warehouse-in, take care of or delivery at last.
Embodiment 2: high alumina gathers light insulating fire brick, proportioning raw materials sees Table 2, takes by weighing alumine, binding agent by weight percentage, more than the granularity of two kinds of raw materials be 200～325 orders, above-mentioned raw materials added in the forced stirrer mix, churning time is 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute, wherein sawdust sieves with 14 purpose screen clothes before using; Add water in proportion, stirred 5-6 minute, the weight ratio of dry powder blend material and water is 1.35: 1, stirs into mobile muddy material, injects mould then, pours into adobe;
Divide two sections to carry out drying adobe, first section is demoulding drying, and drying temperature is 40～50 ℃, and be 16～20h time of drying; Second section is forced drying, and drying temperature is 90～100 ℃, and be 14～16h time of drying, and dry back adobe moisture mass content is controlled at below 6%; With the exsiccant adobe kiln of packing into, be heated to 1270～1300 ℃ from normal temperature, insulation 6～8h burns till kiln discharge behind the product furnace cooling.Adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 32～48h.
Embodiment 3: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, binding agent by weight percentage, and above-mentioned raw materials is added in the forced stirrer, mixes and stirs 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1.35: 1, stirs then 5-6 minute, stirs into mobile muddy material, injects mould then, pours into adobe;
Divide two sections to carry out drying adobe, first section is demoulding drying, and drying temperature is 50～60 ℃, and be 16～18h time of drying; Second section is forced drying, and drying temperature is 80～100 ℃, and be 12～15h time of drying, and dry back adobe moisture mass content is controlled at below 6%; With the exsiccant adobe kiln of packing into, be heated to 1300～1350 ℃ from normal temperature, insulation 6～7h burns till kiln discharge behind the product furnace cooling.Adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 32～40h.
Embodiment 4: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, binding agent by weight percentage, above-mentioned raw materials is added to mix in the forced stirrer stirred 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1: 1, stirs 5-6 minute, makes meeting mobile muddy material, injects mould then, pours into adobe;
Divide two sections to carry out drying adobe, first section is demoulding drying, and drying temperature is 40～60 ℃, and be 16～24h time of drying; Second section is forced drying, and drying temperature is 100～120 ℃, and be 15～18h time of drying, and dry back adobe moisture mass content is controlled at below 6%; With the exsiccant adobe kiln of packing into, be heated to 1300～1320 ℃ from normal temperature, insulation 6～8h burns till kiln discharge behind the product furnace cooling.Adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 35～45h.
Embodiment 5: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, binding agent by weight percentage, above-mentioned raw materials is added in the forced stirrer mixed 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1.05: 1, stirs 5-6 minute, stirs into meeting mobile muddy material, injects mould then, pours into adobe;
Divide two sections to carry out drying adobe, first section is demoulding drying, and drying temperature is 40～60 ℃, and be 18～22h time of drying; Second section is forced drying, and drying temperature is 90～110 ℃, and be 14～16h time of drying, and dry back adobe moisture mass content is controlled at below 6%; With the exsiccant adobe kiln of packing into, be heated to 1280～1320 ℃ from normal temperature, insulation 6～8h burns till kiln discharge behind the product furnace cooling.Adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 35～40h.
Embodiment 6: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, alumine cement by weight percentage, above-mentioned raw materials is added to mix in the forced stirrer stirred 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1.5: 1, stirs 5-6 minute, stirs into meeting mobile muddy material, injects mould then, pours into adobe;
Divide two sections to carry out drying adobe, first section is demoulding drying, and drying temperature is 40～60 ℃, and be 16～24h time of drying; Second section is forced drying, and drying temperature is 80～120 ℃, and be 12～18h time of drying, and dry back adobe moisture mass content is controlled at below 6%; With the exsiccant adobe kiln of packing into, be heated to 1270～1350 ℃ from normal temperature, insulation 6～8h burns till kiln discharge behind the product furnace cooling.Adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 32～48h.
Embodiment 7: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, binding agent alumine cement by weight percentage, above-mentioned raw materials is added to mix in the forced stirrer stirred 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1.7: 1, stirs then 5-6 minute, stirs into meeting mobile muddy material, injects mould then, pours into adobe.All the other contents are with embodiment 1.
Embodiment 8: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, binding agent alumine cement by weight percentage, above-mentioned raw materials is added to mix in the forced stirrer stirred 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1.2: 1, stirs then 5-6 minute, stirs into meeting mobile muddy material, injects mould then, pours into adobe.All the other contents are with embodiment 2.
Embodiment 9: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, binding agent alumine cement by weight percentage, above-mentioned raw materials is added to mix in the forced stirrer stirred 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1.4: 1, stirs then 5-6 minute, stirs into meeting mobile muddy material, injects mould then, pours into adobe.All the other contents are with embodiment 3.
Embodiment 10: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, takes by weighing alumine, binding agent alumine cement by weight percentage, above-mentioned raw materials is added to mix in the forced stirrer stirred 5-6 minute; Add poly-light ball, sawdust then in proportion, stirred 5-6 minute; Add water in proportion, the weight ratio of dry powder blend material and water is 1.3: 1, stirs then 5-6 minute, stirs into meeting mobile muddy material, injects mould then, pours into adobe.All the other contents are with embodiment 4.
Embodiment 11～15: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, and production method no longer describes in detail with embodiment 1.
Embodiment 16～20: high alumina gathers light insulating fire brick, and proportioning raw materials sees Table 2, and production method no longer describes in detail with embodiment 6.
The poly-light insulating fire brick composition of high alumina among table 2: the embodiment 1～20
Claims (9)
1. light high-alumina insulating firebrick, it is characterized in that: represent with weight percent, raw material is a bauxite chamotte 40～60%, and binding agent 40～60% adds poly-light ball that accounts for above-mentioned raw materials gross weight 0.5～1.5% and the sawdust that accounts for above-mentioned raw materials gross weight 10～15%.
2. according to the described light high-alumina insulating firebrick of claim 1, it is characterized in that: alumina content is 50～88% in the described bauxite chamotte, and granularity is 200～325 orders.
3. according to the described light high-alumina insulating firebrick of claim 1, it is characterized in that: described binding agent is kaolin or alumine cement, and granularity is 200～325 orders.
4. according to the described light high-alumina insulating firebrick of claim 1, it is characterized in that: described poly-light ball unit weight is 15～20kg/m
3
5. according to the described light high-alumina insulating firebrick of claim 1, it is characterized in that: described sawdust sieves with 14 purpose screen clothes before using.
6. according to the described light high-alumina insulating firebrick of claim 1, it is characterized in that: described poly-light ball consumption is preferably 0.8～1.2%, and described sawdust consumption is preferably 12～14%.
7. the preparation method of the described light high-alumina insulating firebrick of claim 1 comprises taking by weighing raw material, batch mixing, moulding, drying and burning till, and it is characterized in that: bauxite chamotte, two kinds of dry powder of binding agent are mixed in proportion; Add poly-light ball and sawdust then, mix; Add entry, the weight ratio of dry powder blend material and water is 1.0～1.75: 1, makes the muddy material through stirring; Inject mould then and pour into adobe, with brick bat drying, the kiln of packing into then; Be heated to 1270～1350 ℃ from normal temperature again, under this temperature, be incubated 6～8h, burn till.
8. according to the preparation method of the described light high-alumina insulating firebrick of claim 7, it is characterized in that: described brick bat drying divides two sections, and first section is demoulding drying, and drying temperature is 40～60 ℃, and be 16～24h time of drying; Second section is forced drying, and drying temperature is 80～120 ℃, and be 12～18h time of drying, and the moisture weight percent content is controlled at below 6% in the dry back adobe.
9. according to the preparation method of the described light high-alumina insulating firebrick of claim 7, it is characterized in that: described adobe from preheating, sintering, insulation to the total time of cooling off kiln discharge be 32～48h.
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| CN104973868A (en) * | 2014-04-14 | 2015-10-14 | 郑州东方炉衬材料有限公司 | High-strength and high-aluminum light heat-insulation and fire-resistant brick and production method thereof |
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Application publication date: 20100707 |