CN112661487A - Preparation method of anorthite light-weight refractory brick - Google Patents
Preparation method of anorthite light-weight refractory brick Download PDFInfo
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Abstract
The invention provides a preparation method of an anorthite light-weight refractory brick, which adopts a batch mixing mode to mix materials, and comprises the following specific steps: step 1: stirring and mixing the silicon-aluminum-containing mineral, the gypsum powder, the saw dust and/or the wood powder to obtain a mixture I; step 2: adding the composite additional binding agent into water and stirring to obtain a mixture II; and step 3: adding the mixture I prepared in the step 1 into the mixture II prepared in the step 2, and mixing to obtain pug; and 4, step 4: pouring the pug prepared in the step 3 into a forming die, directly demoulding after moisture curing to obtain an anorthite brick wet blank, and directly wet-stacking the anorthite brick wet blank on a kiln car; and 5: and (5) performing firing forming. The wet anorthite brick blank poured by the method is quickly solidified, wet stacking can be directly carried out after demoulding, drying is not needed, and the strength of the demoulded wet blank can meet the process requirement of wet stacking of anorthite bricks with more than three layers.
Description
Technical Field
The invention relates to the technical field of refractory material preparation, in particular to a preparation method of an anorthite light-weight refractory brick. The anorthite light heat-insulating brick has the advantages of small volume density, small heat conductivity, good thermal shock resistance and strong effect of reducing atmosphere resistance, the use temperature is 1100-1300 ℃, the anorthite light heat-insulating refractory brick is widely applied, and the anorthite light heat-insulating refractory brick is used as a heat-insulating lining of a hot blast furnace, a soaking furnace, a heating furnace and the like in the steel industry, a heat-insulating lining of various catalytic cracking furnaces in the petroleum industry and the like.
Background
The anorthite refractory brick has the characteristics of small density, small thermal expansion coefficient, low thermal conductivity and the like, can replace clay bricks and siliceous and high-alumina refractory materials with the working temperature of 1000-1300 ℃, realizes energy conservation and emission reduction, and is developed by some large-scale refractory material manufacturers at home and abroad in succession to be used as the refractory lining of the kiln.
The existing anorthite brick raw material cannot be hardened quickly after being poured, the mechanical and physical properties of a hardened wet anorthite brick blank are low, the requirement of wet stacking of anorthite bricks cannot be met, a drying procedure must be carried out before wet stacking is carried out, the strength of a blank body is low before drying, inevitable loss is brought to subsequent procedures such as drying, stacking, kiln loading and the like, the yield is easily reduced, the labor is inevitably increased, the procedure of the procedures is increased, and the operation time is increased, so that the production efficiency is reduced, and the generation cost is increased.
The prior art has various raw materials, so that inevitable impurities of each raw material are difficult to control, and the mechanical property and the physical and chemical properties of the Callicate brick are unstable due to the existence of the impurities, so that the actual industrial requirements cannot be met.
Disclosure of Invention
The invention provides a preparation method of an anorthite light-weight refractory brick, aiming at solving the technical problem of how to realize the wet stacking of an anorthite brick wet blank before firing so as to simplify the preparation process of the anorthite brick.
In order to achieve the purpose, the technical scheme adopted by the invention is a preparation method of the anorthite light-weight refractory brick, the preparation method of the anorthite light-weight refractory brick adopts a batch mixing mode to mix materials, and the preparation method comprises the following specific steps: step 1: stirring and mixing the silicon-aluminum-containing mineral, the gypsum powder, the saw dust and/or the wood powder to obtain a mixture I; step 2: adding the composite additional binding agent into water and stirring to obtain a first mixture; and step 3: adding the mixture I prepared in the step 1 into the mixture II prepared in the step 2, and mixing to obtain pug; and 4, step 4: pouring the pug prepared in the step 3 into a forming die, directly demoulding after moisture curing to obtain an anorthite brick wet blank, and directly wet-stacking the anorthite brick wet blank on a kiln car; and 5: and (5) performing firing forming.
According to the invention, the main material and the additive component are mixed separately, so that the gypsum powder can be mixed into other main material components more uniformly and sufficiently, the additive component is dissolved in water in advance, and the dispersion effect of the additive component is improved, so that the gypsum powder in the main material component and the additive have better miscibility and are dispersed more uniformly, interaction is easier to occur, the wet curing effect of the wet anorthite brick blank is improved to a great extent, and the compressive strength of the wet anorthite brick blank is obviously enhanced.
Furthermore, in order to achieve a better moisture curing effect of the anorthite brick, the content of the raw materials of the anorthite brick required in the preparation process is further limited. In the preparation method, the content of the silicon-aluminum-containing mineral in the step 1 is 30-75%, the content of the gypsum powder is 15-40%, the content of the saw powder and/or the wood powder is 5-20%, and the content of the composite additional bonding agent in the step 2 is 1.5-8.0%.
Further, in order to better improve the comprehensive performance of the calcium feldspar brick, lightweight aggregate can be added in the step 1, wherein the preferable content of the lightweight aggregate is 5-30%; further, the lightweight aggregate is Fe2O3Less than or equal to 0.8 percent of lightweight aggregate; further, the lightweight aggregate is Fe2O3Less than or equal to 0.8 percent of brick leftovers.
Furthermore, in order to further improve the compression resistance effect of the wet stacking of the anorthite bricks obtained in the preparation process, a moisture curing additive is added in the preparation method of the anorthite bricks. The moisture curing additive can interact with the gypsum powder, and after the moisture curing additive is added, the gypsum can convert free water into crystal water with better and more thorough effect, thereby greatly improving the moisture curing effect of the wet anorthite brick blank and enhancing the compressive strength of the wet anorthite brick blank. Moisture curing additives may also be added in said step 2. Preferably, the moisture-curing additive is present in an amount of 1 to 5%. More preferably, the moisture-curing additive comprises one or more of an alkali metal compound, an alkaline earth metal compound, a silicon compound, a phosphorus compound; more preferably, the alkaline earth metal compound is one or more of calcium compound, magnesium compound and barium compound, and the phosphorus compound is one or more of sodium phosphate, potassium phosphate, sodium metaphosphate and potassium metaphosphate; more preferably, the calcium compound is one or more of calcium oxide, calcium hydroxide, calcium chloride, calcium fluoride and calcium phosphate.
Furthermore, in order to improve the wet curing effect of the wet blank of the anorthite brick and the compressive strength of the wet blank, the wet curing time is further limited. The moisture curing time in the step 4 is 5-60 min; preferably, the time of the moisture curing is 5-40 min; more preferably, the moisture curing time is 10 to 30 min.
Furthermore, in order to improve the comprehensive performance of the anorthite brick, the invention further limits the firing process of the anorthite brick. The specific method for firing and forming in the step 5 comprises the following steps: raising the temperature to 900-1100 ℃ at the temperature raising speed of 3-8 ℃/min, then raising the temperature to 1200-1450 ℃ at the temperature raising speed of 1-2 ℃/min, preserving the temperature for 1.5-3h, and then naturally cooling; preferably, the specific method for firing and forming is as follows: raising the temperature to 950-1050 ℃ at the temperature raising speed of 4-6 ℃/min, then raising the temperature to 1250-1350 ℃ at the temperature raising speed of 1.2-1.8 ℃/min, preserving the temperature for 1.5-2.5h, and then naturally cooling.
Further, the aluminous mineral is clay and aluminous mineral with the total content of alumina and silica which are different from the clay being more than 80%; preferably, the content of the clay is 5-20%, and the content of the silica-alumina mineral different from the clay is 25-60%; more preferably, the mineral containing silicon and aluminum is one or more of kaolin, kyanite, mullite and montmorillonite; more preferably, the alumino-silicate containing mineral is kaolin having a combined alumina and silica content of greater than 85%.
Further, the gypsum powder comprises desulfurization waste residues, wherein the desulfurization waste residues can be recycled desulfurization waste residues.
Further, the clay is high-alumina clay fine powder.
Further, the composite additional binding agent is at least two of an organic binding agent and an inorganic binding agent; the inorganic binder is one or more of alkaline earth metal compounds and III main group element compounds; the organic binder is one or more of lignin binder, phenolic resin binder, epoxy resin binder and polyurethane binder. Preferably, the alkaline earth metal compound is one or more of a magnesium compound, a calcium compound, a barium compound and a strontium compound, and the calcium compound is one or more of calcium oxide, calcium hydroxide, calcium chloride, calcium fluoride and calcium phosphate; the compound of the group III element is one or more of an aluminum compound and a boron compound; the aluminum compound is sodium metaaluminate, aluminum hydroxide, aluminum chloride and calcium metaaluminate.
The invention also provides an anorthite light-weight refractory brick which is prepared by the preparation method. The anorthite light-weight refractory brick prepared by the method has the advantages of good compressive strength, high breaking strength, low volume density, heating permanent line change, heat conductivity coefficient and low impurity content. Normal temperature compression strength of 1.07-1.50MPa, normal temperature rupture strength of 0.5-1MPa, and volume density of 0.45-0.58g/cm3The change rate of the heating permanent line (1230 ℃ multiplied by 24h) is-0.12-0%, the heat conductivity coefficient at 200 ℃ is 0.095-0.100W/(m.K), the heat conductivity coefficient at 400 ℃ is 0.102-0.109W/(m.K), and the heat conductivity at 600 ℃ isThe coefficient is 0.110-0.123W/(m.K), and the chemical components of the burnt feldspar brick comprise 40-50% of silicon dioxide, 33-42% of aluminum oxide, 0.50-0.95% of ferric oxide, 12-16% of calcium oxide and 0.2-0.4% of potassium oxide.
The invention also provides application of the anorthite light-weight refractory brick, and the anorthite light-weight refractory brick is used for one or more of the metallurgical industry, the ceramic thermal engineering industry, the heat treatment industry, the petrochemical industry and the industrial kiln lining. The anorthite light heat-insulating refractory brick has wide application, and is used as a heat-insulating lining of a hot-blast stove, a soaking pit furnace, a heating furnace and the like in the steel industry, a heat-insulating lining of various catalytic cracking furnaces in the petroleum industry and the like.
By adopting the technical scheme, the invention at least has the following advantages:
the method for preparing the anorthite light-weight refractory brick has the advantages that the used raw materials are low in price and not complicated in variety, and the content of iron oxide impurities affecting the overall performance of the anorthite brick is controlled in a small range.
The method only selects the cheap natural minerals with certain silicon-aluminum content, in particular the kaolin with certain silicon-aluminum content, to remove iron as the main raw material, the gypsum comprises the recycled desulfurized gypsum as the gel raw material, the return material (optional) of the anorthite brick and the saw dust is only added as the combustible, so that the prepared anorthite has single phase, high purity and low cost.
According to the invention, after gypsum is added, free water in the raw material mixture can be changed into crystal water, so that the poured wet anorthite brick blank is rapidly solidified, wet stacking can be directly carried out after demoulding, drying is not required, the time consumed for waiting for drying is reduced, the risk of loss of the wet anorthite brick blank caused by implementation of a drying procedure is reduced, and the wet anorthite brick blank is directly put into a kiln for calcination after wet stacking, so that the production flow time is greatly shortened, the defects of collision, block falling and the like caused by implementation of a drying procedure on the wet anorthite brick blank are avoided, and the production efficiency, the production capacity and the product qualification rate are further improved. The intensity of the demoulded wet blank can meet the process requirement of stacking more than three layers of anorthite wet blanks, therefore, after the anorthite wet blank is demoulded, the anorthite wet blank is directly stacked on a kiln car to be matched with the three layers of wet blanks with the height of a tunnel kiln, and then is directly fed into the kiln for calcination, so that the brick loss caused by repeated carrying is avoided, and the labor is greatly saved.
After the moisture curing additive is added, the moisture curing additive and the gypsum can generate a mutual synergistic effect, so that the speed of changing free water in the raw material mixture into crystal water is increased, the effect of promoting the moisture curing of the anorthite green body by the gypsum is further enhanced, the moisture curing speed is higher after the anorthite green body raw material is poured into a forming die, the compressive strength of the wet green body after the moisture curing is higher, and the number of layers of the supported stacking layer is higher. According to the invention, a separate material mixing mode is adopted, so that the gypsum powder can be uniformly distributed in other main material related components, and the additive components are dissolved in water and then are favorably and fully mixed with the main materials, so that the gypsum powder and the additive components can fully play a mutual synergistic effect, the wet curing effect of the wet anorthite blank is more obvious, and the compressive strength of the wet anorthite blank after wet curing is higher.
Therefore, the anorthite light heat-insulation refractory brick and the application thereof have important significance and good application prospect for improving the prior art of the anorthite brick.
Drawings
FIG. 1 is a schematic diagram of a wet blank of the anorthite light-weight refractory brick of the present invention.
FIG. 2 is a schematic diagram of wet blank stacking of the anorthite light-weight refractory bricks.
Detailed Description
To further clarify the technical measures and effects of the present invention adopted to achieve the intended purpose, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
FIG. 1 shows a schematic view of a green compact of an anorthite light-weight refractory brick according to the present invention, which has six surfaces constituting a rectangular parallelepiped shape including two faces I, two faces II and two faces III, and has a length of 250mm to 350mm in a direction perpendicular to the face II.
The wet stacking in the invention refers to that after the anorthite brick raw material is poured, an anorthite brick wet blank is obtained through wet curing, and the anorthite brick wet blank is stacked under the condition of not being dried. The wet stacking mode is stacking according to the direction vertical to the surface II, wherein the surface II is parallel to the horizontal plane, wet blanks of upper and lower adjacent layers are arranged in a cross mode, a schematic diagram of wet stacking is shown in figure 2, and the total height of three layers of the anorthite bricks is 750mm-1050 mm.
A method for verifying the strength of wet stack includes pouring pug in mould, wet solidifying for a certain time to demould wet blank, stacking in a specified wet stack mode, laying one wet blank layer each time, standing for 10 min, observing if the wet blank at the bottom layer is deformed, laying another wet blank layer if it is not deformed, repeating said steps until the wet blank at the bottom layer is deformed, and recording the number of stack layers when deformation occurs.
The number of layers required for stacking of the tunnel kiln is three, which also indicates that the compressive strength of the wet blank of the anorthite light-weight refractory brick at least needs to meet the requirement of three layers of wet stacking.
Comparative example 1: preparation of existing calcium feldspar brick O
Raw materials: kaolin, high-alumina clay fine powder, sawdust and/or wood powder, calcium compound and aluminum compound.
The preparation method comprises the following steps: adding 50% of kaolin, 15% of high-alumina clay fine powder, 15% of sawdust, 15% of calcium compound and 5% of aluminum compound into water, stirring and mixing to obtain pug; and pouring the obtained pug into a forming die.
As a result: after the pug is poured into a forming die, after 1 hour, the pug can be hardened and formed but is not enough to meet the requirement of wet stacking, and when two layers of anorthite bricks are stacked in a wet mode, the wet blank of the anorthite brick at the bottommost layer is slightly deformed; when three layers of anorthite bricks are stacked in a wet mode, the wet blank of the anorthite brick at the bottommost layer is obviously deformed and even cracked.
Example 1: preparation of Calcite brick I of the invention
Raw materials: kaolin, gypsum powder, high-alumina clay fine powder, saw dust and/or wood powder, calcium compounds and aluminum compounds.
The preparation method comprises the following steps: adding 50% of kaolin, 20% of gypsum powder, 15% of high-alumina clay fine powder, 13% of sawdust, 0.5% of calcium chloride and 1.5% of sodium metaaluminate into water, and stirring and mixing to obtain pug; pouring the obtained pug into a forming die, demolding after moisture curing, and directly stacking on a kiln car; and firing and forming to obtain the anorthite light heat-insulating refractory brick.
As a result: after the pug is poured into a forming die, the obtained wet blank can meet the requirement of wet stacking after 10 minutes of wet curing, the wet stacked four-layer anorthite brick can not deform the anorthite brick at the bottom layer, and the wet stacked five-layer anorthite brick only slightly deforms the anorthite brick at the bottom layer.
Example 2: preparation of Calcite brick II of the invention
Raw materials: kaolin, gypsum powder, high-alumina clay fine powder, saw dust and/or wood powder, calcium compounds and aluminum compounds.
The preparation method comprises the following steps: mixing 50% of kaolin, 20% of gypsum powder, 15% of high-alumina clay fine powder and 13% of sawdust to obtain a first mixture; adding 0.5% of calcium chloride and 1.5% of sodium metaaluminate into water, stirring and mixing to obtain a mixture II; adding the mixture I into the mixture II, stirring and mixing to obtain pug; and pouring the obtained pug into a forming die, demolding after moisture curing, directly stacking on a kiln car for firing and forming, and thus obtaining the anorthite light heat-insulating refractory brick.
As a result: after the pug is poured into a forming die, the obtained wet blank can meet the requirement of wet stacking after 10 minutes of wet curing, the wet stacked four-layer anorthite bricks can not deform the bottom anorthite brick, and the bottom anorthite brick does not slightly deform when the five-layer anorthite brick is wet stacked.
Comparison of the experimental results of example 1 and example 2 shows that the compression strength of the wet green anorthite brick of example 2 is higher than that of the wet green anorthite brick of example 1, and that the separate mixing of the main material component and the additive component mainly provides better wet curing.
Example 3: preparation of the Calcite brick III of the invention
Raw materials: kaolin, gypsum powder, brick leftovers, high-alumina clay fine powder, saw dust and/or wood powder, calcium oxide and lignin adhesive.
The preparation method comprises the following steps: adding 43% of kaolin, 20% of gypsum powder, 10% of brick leftovers, 12% of high-alumina clay fine powder, 13% of saw dust, 0.5% of calcium oxide and 1.5% of lignin adhesive into water, and stirring and mixing to obtain pug; and pouring the obtained pug into a forming die, demolding after moisture curing, directly stacking on a kiln car for firing and forming, and thus obtaining the anorthite light heat-insulating refractory brick.
As a result: after the pug is poured into a forming die, the obtained wet blank can meet the requirement of wet stacking after 10 minutes of wet curing, the wet stacked four-layer anorthite brick can not deform the anorthite brick at the bottom layer, and the wet stacked five-layer anorthite brick only slightly deforms the anorthite brick at the bottom layer.
Example 4: preparation of Calcite brick IV of the invention
Raw materials: kaolin, gypsum powder, brick leftovers, high-alumina clay fine powder, saw dust and/or wood powder, calcium oxide and lignin adhesive.
The preparation method comprises the following steps: mixing 43% of kaolin, 20% of gypsum powder, 10% of brick leftovers, 12% of high-alumina clay fine powder and 13% of sawdust to obtain a first mixture; adding 0.5% of calcium oxide and 1.5% of lignin adhesive into water, stirring and mixing to obtain a mixture II; adding the mixture I into the mixture II, stirring and mixing to obtain pug; and pouring the obtained pug into a forming die, demolding after moisture curing, directly stacking on a kiln car for firing and forming, and thus obtaining the anorthite light heat-insulating refractory brick.
As a result: after the pug is poured into a forming die, the obtained wet blank can meet the requirement of wet stacking after 10 minutes of wet curing, the wet stacked four-layer anorthite bricks can not deform the bottom anorthite brick, and the bottom anorthite brick does not slightly deform when the five-layer anorthite brick is wet stacked.
Comparison of the experimental results of example 3 and example 4 shows that the compression strength of the wet green anorthite brick of example 4 is higher than that of the wet green anorthite brick of example 3, and that the separate mixing of the main material component and the additive component mainly provides better wet curing.
Example 5: preparation of Calcite brick V of the invention
Raw materials: kaolin, gypsum powder, high-alumina clay fine powder, saw dust and/or wood powder, an epoxy resin adhesive, sodium metaaluminate and sodium silicate.
The preparation method comprises the following steps: stirring and mixing 50% of kaolin, 20% of gypsum powder, 14% of high-alumina clay fine powder and 11% of sawdust to obtain a first mixture; adding 0.5% of epoxy resin adhesive, 1.5% of sodium metaaluminate and 3.0% of sodium silicate into water, stirring and mixing to obtain a mixture II; adding the mixture I into the mixture II to obtain pug; and pouring the obtained pug into a forming die, demolding after moisture curing, directly stacking on a kiln car for firing and forming, and thus obtaining the anorthite light heat-insulating refractory brick.
As a result: after the pug is poured into a forming die, the obtained wet blank can meet the requirement of wet stacking after 5 minutes of wet curing, the wet stacked four layers of anorthite bricks can not deform the anorthite brick at the bottom layer, and the wet stacked six layers of anorthite bricks only slightly deform the anorthite brick at the bottom layer.
The experimental result shows that after the moisture curing additive is added, the moisture curing speed of the wet anorthite brick blank is higher, and the compressive strength of the wet anorthite brick blank is higher after moisture curing.
Example 6: preparation of Calcite brick VI of the invention
Raw materials: kaolin, gypsum powder, high-alumina clay fine powder, saw dust and/or wood powder, an epoxy resin adhesive, sodium metaaluminate and sodium silicate.
The preparation method comprises the following steps: stirring and mixing 50% of kaolin, 20% of gypsum powder, 14% of high-alumina clay fine powder and 11% of sawdust to obtain a first mixture; adding 0.5% of epoxy resin adhesive, 1.5% of sodium metaaluminate and 3.0% of sodium silicate into water, stirring and mixing to obtain a mixture II; adding the mixture I into the mixture II to obtain pug; pouring the obtained pug into a forming die, demolding after moisture curing for 10-15 minutes, directly stacking on a kiln car for firing and forming to obtain the anorthite light heat-insulating refractory brick; the firing forming process comprises the following steps: raising the temperature to 950-1050 ℃ at the temperature raising speed of 4-6 ℃/min, then raising the temperature to 1250-1350 ℃ at the temperature raising speed of 1.2-1.8 ℃/min, preserving the temperature for 1.5-2.5h, and then naturally cooling.
As a result: the physical properties and chemical components of the fired and molded anorthite brick are detected, and the detection results are as follows: normal temperature compression strength of 1.2-1.40MPa, normal temperature rupture strength of 0.8-1MPa, and volume density of 0.48-0.53g/cm3The permanent line change rate (1230 ℃ multiplied by 24h) of the calcium feldspar brick is-0.08-0%, the thermal conductivity coefficient at 200 ℃ is 0.095-0.100W/(m.K), the thermal conductivity coefficient at 400 ℃ is 0.102-0.109W/(m.K), the thermal conductivity coefficient at 600 ℃ is 0.110-0.123W/(m.K), and the chemical components of the burnt calcium feldspar brick comprise 42-48% of silicon dioxide, 34-40% of aluminum oxide, 0.50-0.75% of ferric oxide, 12-16% of calcium oxide and 0.2-0.4% of potassium oxide.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention.
Claims (10)
1. The preparation method of the anorthite light-weight refractory brick is characterized by mixing materials in batches, and comprises the following specific steps:
step 1: stirring and mixing the silicon-aluminum-containing mineral, the gypsum powder, the saw dust and/or the wood powder to obtain a mixture I;
step 2: adding the composite additional binding agent into water and stirring to obtain a mixture II;
and step 3: adding the mixture I prepared in the step 1 into the mixture II prepared in the step 2, and mixing to obtain pug;
and 4, step 4: pouring the pug prepared in the step 3 into a forming die, directly demoulding after moisture curing to obtain an anorthite brick wet blank, and directly wet-stacking the anorthite brick wet blank on a kiln car;
and 5: and firing and forming to obtain the anorthite light-weight refractory brick.
2. The method for preparing the anorthite light-weight refractory brick as claimed in claim 1, wherein the content of the silica-alumina-containing mineral in the step 1 is 30-75%, the content of the gypsum powder is 15-40%, the content of the saw powder and/or wood powder is 5-20%, and the content of the composite additional bonding agent in the step 2 is 1.5-8.0%.
3. The method for preparing anorthite light-weight refractory bricks according to claim 1, wherein lightweight aggregates are further added in the step 1; preferably, the content of the lightweight aggregate is 5-30%; more preferably, the lightweight aggregate is Fe2O3Less than or equal to 0.8 percent of lightweight aggregate; most preferably, the lightweight aggregate is Fe2O3Less than or equal to 0.8 percent of brick leftovers.
4. The method for preparing anorthite light-weight refractory bricks according to claim 1, wherein a moisture curing additive is further added in the step 2; preferably, the content of the moisture curing additive is 1-5%; more preferably, the moisture-curing additive comprises one or more of an alkali metal compound, an alkaline earth metal compound, a silicon compound, a phosphorus compound; further preferably, the alkaline earth metal compound is one or more of a calcium compound, a magnesium compound and a barium compound, and the phosphorus compound is one or more of sodium phosphate, potassium phosphate, sodium metaphosphate and potassium metaphosphate; most preferably, the calcium compound is one or more of calcium oxide, calcium hydroxide, calcium chloride, calcium fluoride, calcium phosphate.
5. The method for preparing anorthite light-weight refractory bricks according to claim 1, wherein the moisture curing time in the step 4 is 5-60 min; preferably, the time of the moisture curing is 5-40 min; more preferably, the moisture curing time is 10 to 30 min.
6. The method for preparing anorthite light-weight refractory bricks according to claim 1, wherein the firing and forming in the step 5 are carried out by the following specific methods: raising the temperature to 900-1100 ℃ at the temperature raising speed of 3-8 ℃/min, then raising the temperature to 1200-1450 ℃ at the temperature raising speed of 1-2 ℃/min, preserving the temperature for 1.5-3h, and then naturally cooling; preferably, the specific method for firing and forming is as follows: raising the temperature to 950-1050 ℃ at the temperature raising speed of 4-6 ℃/min, then raising the temperature to 1250-1350 ℃ at the temperature raising speed of 1.2-1.8 ℃/min, preserving the temperature for 1.5-2.5h, and then naturally cooling.
7. The method for preparing the anorthite light-weight refractory brick as claimed in claim 1, wherein the aluminous mineral is clay and aluminous mineral containing more than 80% of alumina and silica other than clay in total; preferably, the content of the clay is 5-20%, and the content of the silica-alumina mineral different from the clay is 25-60%; more preferably, the mineral containing silicon and aluminum is one or more of kaolin, kyanite, mullite and montmorillonite; more preferably, the alumino-silicate containing mineral is kaolin having a combined alumina and silica content of greater than 85%.
8. The method for preparing the anorthite light-weight refractory brick as claimed in claim 1, wherein the gypsum powder comprises desulfurized waste residues.
9. The method for preparing anorthite light-weight refractory bricks according to claim 7, wherein the clay is high-alumina clay fine powder.
10. The method for preparing the anorthite light-weight refractory brick as claimed in claim 1, wherein the composite additional binding agent is an organic binding agent and/or an inorganic binding agent; the inorganic bonding agent is one or more of alkaline earth metal compounds and III main group element compounds, and the organic bonding agent is one or more of lignin bonding agent, phenolic resin bonding agent, epoxy resin bonding agent and polyurethane bonding agent; preferably, the alkaline earth metal compound is one or more of a magnesium compound, a calcium compound, a barium compound and a strontium compound, the calcium compound is one or more of calcium oxide, calcium hydroxide, calcium chloride, calcium fluoride and calcium phosphate, the group III element compound is one or more of an aluminum compound and a boron compound, and the aluminum compound is one or more of sodium metaaluminate, aluminum hydroxide, aluminum chloride and calcium metaaluminate.
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Address after: 224200 West Industrial Park, Hougang Town, Dongtai City, Yancheng City, Jiangsu Province Applicant after: Gangtai refractory (Jiangsu) Co.,Ltd. Address before: 224213 hougangxi Industrial Park, Dongtai City, Yancheng City, Jiangsu Province Applicant before: DONGTAI GANGTAI REFRACTORY CO.,LTD. |