CA2071740A1 - Barbecue brick - Google Patents
Barbecue brickInfo
- Publication number
- CA2071740A1 CA2071740A1 CA 2071740 CA2071740A CA2071740A1 CA 2071740 A1 CA2071740 A1 CA 2071740A1 CA 2071740 CA2071740 CA 2071740 CA 2071740 A CA2071740 A CA 2071740A CA 2071740 A1 CA2071740 A1 CA 2071740A1
- Authority
- CA
- Canada
- Prior art keywords
- brick
- barbecue
- bricks
- silicate
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Baking, Grill, Roasting (AREA)
Abstract
BARBECUE BRICK
ABSTRACT
A method of manufacturing a barbecue brick comprises the mixing of organic and/or inorganic material with a silicate solution which binds the various constituents and prevents combustion of the brick. The mixture is cast into moulds, cured and cut to the desired brick sizes. The cut bricks are then heated, thereby causing charring of the organic particles and frothing of the silicates. The organic material comprises wood particles and the inorganic component is made up of refractory material such as fire clay or alumina-silica. The silicate solution comprises aqueous sodium silicate and/or aqueous potassium silicate. The bricks manufactured by this method are characterized by a high porosity which serves to prevent fluids, resulting from the cooking of meats, from dripping on to the gas burners. In this manner, these bricks prevent fouling of the barbecue and the burners. In addition, flaring, which occurs as such fluids are combusted over the burners, is also prevented. A further method is provided for treating known barbecue bricks to increase their surface porosity.
ABSTRACT
A method of manufacturing a barbecue brick comprises the mixing of organic and/or inorganic material with a silicate solution which binds the various constituents and prevents combustion of the brick. The mixture is cast into moulds, cured and cut to the desired brick sizes. The cut bricks are then heated, thereby causing charring of the organic particles and frothing of the silicates. The organic material comprises wood particles and the inorganic component is made up of refractory material such as fire clay or alumina-silica. The silicate solution comprises aqueous sodium silicate and/or aqueous potassium silicate. The bricks manufactured by this method are characterized by a high porosity which serves to prevent fluids, resulting from the cooking of meats, from dripping on to the gas burners. In this manner, these bricks prevent fouling of the barbecue and the burners. In addition, flaring, which occurs as such fluids are combusted over the burners, is also prevented. A further method is provided for treating known barbecue bricks to increase their surface porosity.
Description
BARBECUE BRICK
The present invention relates to barbecue bricks having increased porosity for preventing the fouling of barbecue burners.
BACKGROUyD OF THE INVENTION
Gas barbecues require porous lava rocks or the like for diffusing heat genera~edby the gas burners. It has bee~ found that, due to their irregular shape, such lava rocks readily allow juices, resulting from the cooking of fatty meats, to pass through channels between the rocks and to drip onto~the burners. Such dripping of juices often results in flaring as the juices are combusted on the burners. Such flaring results in the burning of the meat being prepared. The dripping of these juices als~ causes fouling of the burners and the barbecue and, therefore, necessitates constant clear~ing.
Manufactured barbecue bncks are another means for diffusing heat from the burners. Although such bricks are of a regular shape, they are generally non-porous and do not trap fluids. Further, in order to adequately diffuse heat and permit upward convec~ion, such bricks must be spaced apart thereby resulting in ~aps which allow juices to drip through. In order to avoid such gaps, bricks containing holes have been designed, but this too results in the dripping of juices onto the burners.
Various other methods have been proposed for preventing the dripping of such fluids. For example, Bolitho, in United~States Patent No. 3,638,~34, describes a rock pack comprising a compacted volume of comminuted lava rock which is packaged within a wire mesh. It is noted in this patent that such an arrangement of lava rock pieces prevents the flow of fluids dripping from the meat being prepared while permitting the upward convection of heat *om the burnors. However, the solution provided by this patent is expensive and difficult since such rock pack cannot be easily made without the use of machinery. Further, one cannot readily convert already existing barbecue bricks to such pack.
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The present invention relates to barbecue bricks having increased porosity for preventing the fouling of barbecue burners.
BACKGROUyD OF THE INVENTION
Gas barbecues require porous lava rocks or the like for diffusing heat genera~edby the gas burners. It has bee~ found that, due to their irregular shape, such lava rocks readily allow juices, resulting from the cooking of fatty meats, to pass through channels between the rocks and to drip onto~the burners. Such dripping of juices often results in flaring as the juices are combusted on the burners. Such flaring results in the burning of the meat being prepared. The dripping of these juices als~ causes fouling of the burners and the barbecue and, therefore, necessitates constant clear~ing.
Manufactured barbecue bncks are another means for diffusing heat from the burners. Although such bricks are of a regular shape, they are generally non-porous and do not trap fluids. Further, in order to adequately diffuse heat and permit upward convec~ion, such bricks must be spaced apart thereby resulting in ~aps which allow juices to drip through. In order to avoid such gaps, bricks containing holes have been designed, but this too results in the dripping of juices onto the burners.
Various other methods have been proposed for preventing the dripping of such fluids. For example, Bolitho, in United~States Patent No. 3,638,~34, describes a rock pack comprising a compacted volume of comminuted lava rock which is packaged within a wire mesh. It is noted in this patent that such an arrangement of lava rock pieces prevents the flow of fluids dripping from the meat being prepared while permitting the upward convection of heat *om the burnors. However, the solution provided by this patent is expensive and difficult since such rock pack cannot be easily made without the use of machinery. Further, one cannot readily convert already existing barbecue bricks to such pack.
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us, the prior art does not provide an efficient barbecue brick for preventing the fouling of barbecue burners and for inhibiting the flaring of fluids resulting from the cooking process.
~UMMARY OF TI~E INVENTION
The present inverltion provides a barbecue brickwhich overcomes the deficienciesof similar bricks presently known. Specifically, the invention provides a barbecue brick havin~ a high porosity formed from a mixture of organic and/or inorganic particles and an aqueous solulion.
The invention also provides a method of rnanufacturing a barbecue brick comprising: a) mixing organic and/or inorganic particles with said aqueous silicate solution, b~ casting the mixture into moulds or forming it into large sheets, c) curing the mix$ure and, d~ cutting the moulds or sheets into bricks. The bricks are then heated until ~he organic particles are charred and the silicate solution froths, thereby increasing the porosity of such bricks.
The present invention also provides a method of treating knowll barbecue bricks and lava rocks to increase their porosity and, therefore, prevent fluids from dripping onto the barbecue burners. Specifically, the present invention discloses a method of insreasing the porosity of barbecue bricks or lava rocks comprising: applying an aqueous silicate ss)lution to the surface of the bricks or rocks and heating same to cause frothing of the silicate solution and thereby resulting in a porous surface on the bricks or rocks.
BRIEF DESCRIPllON OF THE I)RAWINGS
These and other features of the invention will become more apparent frorn the following description in which reference is made to the appended dra~ings wherein:
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us, the prior art does not provide an efficient barbecue brick for preventing the fouling of barbecue burners and for inhibiting the flaring of fluids resulting from the cooking process.
~UMMARY OF TI~E INVENTION
The present inverltion provides a barbecue brickwhich overcomes the deficienciesof similar bricks presently known. Specifically, the invention provides a barbecue brick havin~ a high porosity formed from a mixture of organic and/or inorganic particles and an aqueous solulion.
The invention also provides a method of rnanufacturing a barbecue brick comprising: a) mixing organic and/or inorganic particles with said aqueous silicate solution, b~ casting the mixture into moulds or forming it into large sheets, c) curing the mix$ure and, d~ cutting the moulds or sheets into bricks. The bricks are then heated until ~he organic particles are charred and the silicate solution froths, thereby increasing the porosity of such bricks.
The present invention also provides a method of treating knowll barbecue bricks and lava rocks to increase their porosity and, therefore, prevent fluids from dripping onto the barbecue burners. Specifically, the present invention discloses a method of insreasing the porosity of barbecue bricks or lava rocks comprising: applying an aqueous silicate ss)lution to the surface of the bricks or rocks and heating same to cause frothing of the silicate solution and thereby resulting in a porous surface on the bricks or rocks.
BRIEF DESCRIPllON OF THE I)RAWINGS
These and other features of the invention will become more apparent frorn the following description in which reference is made to the appended dra~ings wherein:
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Fi~re 1 is a cross sectional view of a gas barbecue containing conventional lavarock.
Figure 2 is a plan view showing a preferred arrangement of conventional barbecuebricks.
Figure 3 is plan view showing the arrangement of barbecue bricks of the present invention.
DETAILED DESCRIPllON OF THE FREFERRED EMBODIMENT
Figure 1 illustrates a conventional gas fired barbecue 10 containing lava rock 12 placed between a grill 14 and the burners 16. Although such rock is porous theirirregular shape results in channels 18 being forrned which allow fluids to pass through thereby resulting in fouling of the burners 16 and the bottom surface of the barbecue.
Further, a por~ion of such fluid is rapidly combusted upon reaching the bwrner flame thereby resulting in ~laring.
Figure 2 illustrates an arrangement of barbecue bricks as }cnown in the prior art.
Th~ bricks 20 are arranged in an array in the barbecue 10, above tbe burners, and separated by spaces 22. The usual recoïmnendation by manufacturers is that such spacing be at least l/4~1. As with lava rock, fluids generated from the cooking of meat flow through such spaces and onto the burners. In addition, such bricks are not very porous and, therefore5 do not trap such fluids.
In Figure 3, the barbecue brick of $he present invention is illustrated. As can be seenj the bricks 24 are also arranged in an array in the barbecue 10; however, the bricks ~e not separated but are in contact with adjacent bsicks. Such an arrangement ispossible due to the higher porosity of these bricks which allows the upward convection of heat while trapping fluids on the surface.
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Figure 2 is a plan view showing a preferred arrangement of conventional barbecuebricks.
Figure 3 is plan view showing the arrangement of barbecue bricks of the present invention.
DETAILED DESCRIPllON OF THE FREFERRED EMBODIMENT
Figure 1 illustrates a conventional gas fired barbecue 10 containing lava rock 12 placed between a grill 14 and the burners 16. Although such rock is porous theirirregular shape results in channels 18 being forrned which allow fluids to pass through thereby resulting in fouling of the burners 16 and the bottom surface of the barbecue.
Further, a por~ion of such fluid is rapidly combusted upon reaching the bwrner flame thereby resulting in ~laring.
Figure 2 illustrates an arrangement of barbecue bricks as }cnown in the prior art.
Th~ bricks 20 are arranged in an array in the barbecue 10, above tbe burners, and separated by spaces 22. The usual recoïmnendation by manufacturers is that such spacing be at least l/4~1. As with lava rock, fluids generated from the cooking of meat flow through such spaces and onto the burners. In addition, such bricks are not very porous and, therefore5 do not trap such fluids.
In Figure 3, the barbecue brick of $he present invention is illustrated. As can be seenj the bricks 24 are also arranged in an array in the barbecue 10; however, the bricks ~e not separated but are in contact with adjacent bsicks. Such an arrangement ispossible due to the higher porosity of these bricks which allows the upward convection of heat while trapping fluids on the surface.
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In accordance with the preferred embodiment, a barbecue brick is formed from a mixture of organic and/or inorganic particles and an aqueous silicate solution as the binding agent.
The o}ganic component of the brick preferably comprises wood chips or coarse saw dust and the inorganic component is preferably a refractory material such as fire clay, alumina-silica,kaolin or Fuller's earth or a combination ~hereo In general, the inorganic material can be any material which does not decompose or deform as a result of heating and cooling. The inorganic material may constitute from about 85~o to 40%
(by volume) of the brick. The silicate solution is preferably a solution of sodium and/or potassium silicate in water; however, any o~her soluble silicate may be used.
In one aspect of the invention, the silicate solution may also include an atlditive such as a dye to enhance the appearance of the bricks. In addition, various modifiers may be added to improve the quality of the bricks. For example, certain salts, such as sodium or calcium chloride, and acids may be added to reduce the curing time of the brick rnixture. Also, small inorganic particles such as sand may be used as a filler.
The mixtllre is placed into moulds or formed into sheets and cured. The moulds rnay be ~he size of a single brick, or larger as required. During the curing process, pressure may be applied to the rnixture for certain periods of time. The amount of pressure applied is dependent upon the constituents of the brick and the desiredappearance. For example, in order to achieve a smooth appearance of tbe brick, apressure of approximateiy 3 psi may be applied for several hours to the curing mixture.
If fine saw dust or slivers of wood (which tend to be resilient) are used a pressure of approximately 10 psi may be required for up to 8 hours. The application of excessive pressure adversely affects the durability of the resultant brick by causirlg the silicates to be squeezed out of the mixture thereby weakening thP structure and reducing the flame inhibiting property of the brick. Further, excessive pressure causes a decrease in the porosity of the brick.
.
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After the curing process, the moulds or sheets are cut to the desired brick sizes and heated, in either a kiln or in a barbecue, until the organic components are charred and the silicates have frothed. The charring of the organic component causes voids to be formed in the interior of the moulds or sheets thereby causing the resulting brick to be porous. Further, the foaming of the silicates also contributes to the porosity of the brick. The silicates, upon frothing, surround the combustible, organic, material in the brick and restrict the amount of oxygen contacting such material. In this manner, the organic material is prevented from being completely combusted during the heating phase and, therefore, such material is only charred.
In the preferred method, the rmixture is cured for about one day at room temperature; however, this period may be extended up to one week in the case where fine softwood sawdust is used. The curing time can be reduced in cases where steam or dry heat is applied.
The silicate solution is preferably present in an amount of from about 15% to 85~o by volume of the rn~xture discussed above. The actual amount of silicate solution in the mixture is dependent upon the composition and desired characteristics of the brick. In the preferred case, 40~o by volume of the mixture is comprised of the silicate solution, 8% is comprised of alumina-silica and the remaining portion is comprised of coarse hardwood particles. Such m~xture is then cast into a rnould and cured, initially, at a temperature of 70F and a pressure of 3 psi for 8 hours. Following this, the casting is allowed tO cure at atmospheric pressure for 7 days.
The brick may be manufactured entirely of organic material, such as wood particles, or of inorganic material, such as refractory particles (fire clay or alumina-silica) or a rnixture of both components, along with a silicate binder. In the case where no organic material îs used, the process of manufacturing the brick preferably includes an additional step of causing voids to be forrned within the matrix. l'his ~an be done by adding, into the silicate solution, small, even sized particles of refractory ma~erial, ceramic material, sand or gravel. Such particles combine with the sil;cates to result in . ~ . . .
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;, ~
. .:
. , .
voids being formed in the matrix thus causing the resulting brick ~o be porous throughout.
In a preferred embodiment, the wood particles are first lightly darnpened with asalt, NaCI9 solution prior to mixing. II1 this way, the particles are ~reated to minimize ~he soaking of the silicates into the particles. Such treatment serves to decrease the curing time of the mixture by reducing the time required for the sil;cates to set. Further, such treatment reduces the amount of silicate solution needed for the bricks. The preferred size of wood particles for use in the present invention is between 3 mm and 5 mm.
In another embodiment of the irlvention, the porosity of a conventional barbecuebrick is increased by applying a silicate solution to its surface and heating the brick ~o cause îrothing of the silicates. In this manner, the bricks are provided with a porous exterior surface which traps fluids generated *om the cooking process and prevents such fluids from dripping onto the barbecue burners. Thus, such treatment of existing bricks inhibits fouling of ~he burners and also reduces the incidence of flaring of the dripping fluids. Preferably, such silicate solution comprises sodium and/or potassium silicate in water.
EXAMPLES
1) A mixture was formed of softwood saw dust (dampened with a mild solution of NaCl) and a sodium silicate solution. The silicate solution constituted 30% (by volume) of the mixture. The mixtuFe was cast in a mould having dimensions: 6~/4" x 31/2" x 7/8".
The mould was kept under a pressure of approximately S psi for 12 hours, at 18C. The casting was then removed ~rom the mould and allowed to sit for 7 days at approximately 18C and at atmospheric pressure. The casting was then cut into two pieces and placçd in a barbecue and heated for 3 hours, on each side, at 280C.
2) A mix~ure was formed with saw dust, a sodium silicate solution (38% by volume) and a refractory clay (8C~o by volume). l'he saw dust was a mixture of medium coarse : . , : .:
,-. .: -,, , .. , , ,-- , - . . - - . , : , :, -hardwood and softwood particles (wherein the average particle size is between 3 mm and 5 mm) and the clay was an alurnina silica mortar rnix. The mixture was cast in a mould having dimensions: 12" x 12" x 3/4". The casting was cured under a pressure of 3 psi and at a temperature of 18C for 6 hours. The casting was then removed from the mould and cured further at atmospheric pressure and room temperature ~or 7 days. The cured casting was then cut into 6" x 3" bricks and fired in a barbecue for 10 hours at 280C.
The resultant brick was found to be structurally stronger than that produced according to Example 1.
3) A m~xture of Virginia hickory wood chips, a sodium silicate solution (35~o byvolume) and an alumina silica mortar (8% by volume) was cast in a mould and initially cured for 4 hours at 3 psi and 17C. The casting was removed from the mould and cured for a further period of 7 days at atmospheric pressure and room temperature. Thecasting was then cut into bricks of the desired size and fired in a barbecue at 280C for 15 hours.
4) A rruxture of hickory wood chips and a sodium silica~e solution (42~o by volume) was cast in a 61/4" x 31/2" x 7/8" mould and tamped. It was found that the silicate solution coagulated imrnediately upon contacting the hickory wood chips. It was thereforeunnecessary to dampen the wood chips with a salt (NaCl) solution. The cas~ing was then cured at 16C and 3 psi for 4 hours. Following this, the casting was removed from the mould and further cured at 16C and atmospheric pressure for 7 days. The casting was then cut into bricks of the desired size which were fired in a barbecue for 8 hours at 2~0C.
5) A sodium silicate solution was applied to cornmonly available barbecue lava rocks.
The rocks, thus coated, were placed in a barbecue above the burners and heated. The sodium silicate film covering the rocks began to foam and turn to a grey colour. After cooling, the foarn hardened thereby resulting in a porous covering on the rocks. When food was cooked over such treated rocks, it was found that the increased porosity created . .
by the ~oamed silicates trapped much of the dripping fluids, thereby reducing the amount of fluid dripping onto the burners and the consequent flaring.
The o}ganic component of the brick preferably comprises wood chips or coarse saw dust and the inorganic component is preferably a refractory material such as fire clay, alumina-silica,kaolin or Fuller's earth or a combination ~hereo In general, the inorganic material can be any material which does not decompose or deform as a result of heating and cooling. The inorganic material may constitute from about 85~o to 40%
(by volume) of the brick. The silicate solution is preferably a solution of sodium and/or potassium silicate in water; however, any o~her soluble silicate may be used.
In one aspect of the invention, the silicate solution may also include an atlditive such as a dye to enhance the appearance of the bricks. In addition, various modifiers may be added to improve the quality of the bricks. For example, certain salts, such as sodium or calcium chloride, and acids may be added to reduce the curing time of the brick rnixture. Also, small inorganic particles such as sand may be used as a filler.
The mixtllre is placed into moulds or formed into sheets and cured. The moulds rnay be ~he size of a single brick, or larger as required. During the curing process, pressure may be applied to the rnixture for certain periods of time. The amount of pressure applied is dependent upon the constituents of the brick and the desiredappearance. For example, in order to achieve a smooth appearance of tbe brick, apressure of approximateiy 3 psi may be applied for several hours to the curing mixture.
If fine saw dust or slivers of wood (which tend to be resilient) are used a pressure of approximately 10 psi may be required for up to 8 hours. The application of excessive pressure adversely affects the durability of the resultant brick by causirlg the silicates to be squeezed out of the mixture thereby weakening thP structure and reducing the flame inhibiting property of the brick. Further, excessive pressure causes a decrease in the porosity of the brick.
.
. , . .
~.e~
After the curing process, the moulds or sheets are cut to the desired brick sizes and heated, in either a kiln or in a barbecue, until the organic components are charred and the silicates have frothed. The charring of the organic component causes voids to be formed in the interior of the moulds or sheets thereby causing the resulting brick to be porous. Further, the foaming of the silicates also contributes to the porosity of the brick. The silicates, upon frothing, surround the combustible, organic, material in the brick and restrict the amount of oxygen contacting such material. In this manner, the organic material is prevented from being completely combusted during the heating phase and, therefore, such material is only charred.
In the preferred method, the rmixture is cured for about one day at room temperature; however, this period may be extended up to one week in the case where fine softwood sawdust is used. The curing time can be reduced in cases where steam or dry heat is applied.
The silicate solution is preferably present in an amount of from about 15% to 85~o by volume of the rn~xture discussed above. The actual amount of silicate solution in the mixture is dependent upon the composition and desired characteristics of the brick. In the preferred case, 40~o by volume of the mixture is comprised of the silicate solution, 8% is comprised of alumina-silica and the remaining portion is comprised of coarse hardwood particles. Such m~xture is then cast into a rnould and cured, initially, at a temperature of 70F and a pressure of 3 psi for 8 hours. Following this, the casting is allowed tO cure at atmospheric pressure for 7 days.
The brick may be manufactured entirely of organic material, such as wood particles, or of inorganic material, such as refractory particles (fire clay or alumina-silica) or a rnixture of both components, along with a silicate binder. In the case where no organic material îs used, the process of manufacturing the brick preferably includes an additional step of causing voids to be forrned within the matrix. l'his ~an be done by adding, into the silicate solution, small, even sized particles of refractory ma~erial, ceramic material, sand or gravel. Such particles combine with the sil;cates to result in . ~ . . .
- - . ~. ;.
;, ~
. .:
. , .
voids being formed in the matrix thus causing the resulting brick ~o be porous throughout.
In a preferred embodiment, the wood particles are first lightly darnpened with asalt, NaCI9 solution prior to mixing. II1 this way, the particles are ~reated to minimize ~he soaking of the silicates into the particles. Such treatment serves to decrease the curing time of the mixture by reducing the time required for the sil;cates to set. Further, such treatment reduces the amount of silicate solution needed for the bricks. The preferred size of wood particles for use in the present invention is between 3 mm and 5 mm.
In another embodiment of the irlvention, the porosity of a conventional barbecuebrick is increased by applying a silicate solution to its surface and heating the brick ~o cause îrothing of the silicates. In this manner, the bricks are provided with a porous exterior surface which traps fluids generated *om the cooking process and prevents such fluids from dripping onto the barbecue burners. Thus, such treatment of existing bricks inhibits fouling of ~he burners and also reduces the incidence of flaring of the dripping fluids. Preferably, such silicate solution comprises sodium and/or potassium silicate in water.
EXAMPLES
1) A mixture was formed of softwood saw dust (dampened with a mild solution of NaCl) and a sodium silicate solution. The silicate solution constituted 30% (by volume) of the mixture. The mixtuFe was cast in a mould having dimensions: 6~/4" x 31/2" x 7/8".
The mould was kept under a pressure of approximately S psi for 12 hours, at 18C. The casting was then removed ~rom the mould and allowed to sit for 7 days at approximately 18C and at atmospheric pressure. The casting was then cut into two pieces and placçd in a barbecue and heated for 3 hours, on each side, at 280C.
2) A mix~ure was formed with saw dust, a sodium silicate solution (38% by volume) and a refractory clay (8C~o by volume). l'he saw dust was a mixture of medium coarse : . , : .:
,-. .: -,, , .. , , ,-- , - . . - - . , : , :, -hardwood and softwood particles (wherein the average particle size is between 3 mm and 5 mm) and the clay was an alurnina silica mortar rnix. The mixture was cast in a mould having dimensions: 12" x 12" x 3/4". The casting was cured under a pressure of 3 psi and at a temperature of 18C for 6 hours. The casting was then removed from the mould and cured further at atmospheric pressure and room temperature ~or 7 days. The cured casting was then cut into 6" x 3" bricks and fired in a barbecue for 10 hours at 280C.
The resultant brick was found to be structurally stronger than that produced according to Example 1.
3) A m~xture of Virginia hickory wood chips, a sodium silicate solution (35~o byvolume) and an alumina silica mortar (8% by volume) was cast in a mould and initially cured for 4 hours at 3 psi and 17C. The casting was removed from the mould and cured for a further period of 7 days at atmospheric pressure and room temperature. Thecasting was then cut into bricks of the desired size and fired in a barbecue at 280C for 15 hours.
4) A rruxture of hickory wood chips and a sodium silica~e solution (42~o by volume) was cast in a 61/4" x 31/2" x 7/8" mould and tamped. It was found that the silicate solution coagulated imrnediately upon contacting the hickory wood chips. It was thereforeunnecessary to dampen the wood chips with a salt (NaCl) solution. The cas~ing was then cured at 16C and 3 psi for 4 hours. Following this, the casting was removed from the mould and further cured at 16C and atmospheric pressure for 7 days. The casting was then cut into bricks of the desired size which were fired in a barbecue for 8 hours at 2~0C.
5) A sodium silicate solution was applied to cornmonly available barbecue lava rocks.
The rocks, thus coated, were placed in a barbecue above the burners and heated. The sodium silicate film covering the rocks began to foam and turn to a grey colour. After cooling, the foarn hardened thereby resulting in a porous covering on the rocks. When food was cooked over such treated rocks, it was found that the increased porosity created . .
by the ~oamed silicates trapped much of the dripping fluids, thereby reducing the amount of fluid dripping onto the burners and the consequent flaring.
6) The procedure of Example S was performed on conventional barbecue bricks achieving the sarne results.
Although the present invention has been described in reference to a preferred embodiment thereof, various modifications will occur to those skilled in the art without departing from the spirit and scope of the invention as set forth in the appended claims.
Although the present invention has been described in reference to a preferred embodiment thereof, various modifications will occur to those skilled in the art without departing from the spirit and scope of the invention as set forth in the appended claims.
Claims (19)
1. A porous barbecue brick formed from a mixture of organic and/or inorganic particles and an aqueous silicate solution.
2. A brick as claimed in claim 1 wherein the silicate solution comprises from about 15% to 85% of the volume of the mixture.
3. A brick as claimed in claim 2 wherein the silicate solution comprises aqueoussodium silicate and/or aqueous potassium silicate.
4. A brick as claimed in claim 3 wherein the organic component is wood particlesand the inorganic component is a refractory material.
5. A brick as claimed in claim 4 wherein the inorganic component is chosen from the group consisting of fire clay and alumina-silica.
6. A brick as claimed in claim 5 wherein the inorganic component comprises from about 8% to 40% of the volume of the mixture.
7. A method of manufacturing a barbecue brick comprising:
a) mixing organic and/or inorganic particles with an aqueous silicate solution;
b) casting the mixture into moulds or forming the mixture into sheets;
c) curing the castings or sheets; and, d) cutting said castings or sheets into bricks;
a) mixing organic and/or inorganic particles with an aqueous silicate solution;
b) casting the mixture into moulds or forming the mixture into sheets;
c) curing the castings or sheets; and, d) cutting said castings or sheets into bricks;
8. A method as claimed in claim 7 wherein pressure is applied during the curing step.
9. A method as claimed in claim 8 further comprising heating said bricks.
10. A method as claimed in claim 9 wherein the silicate solution comprises from about 15% to 85% of the volume of the mixture.
11. A method as claimed in claim 10 wherein the silicate solution comprises aqueous sodium silicate and/or aqueous potassium silicate.
12. A method as claimed in claim 11 wherein the organic component is wood particles and the inorganic component is a refractory material.
13. A method as claimed in claim 12 wherein the inorganic component is chosen from the group consisting of fire clay and alumina-silica.
14. A method as claimed in claim 13 wherein the inorganic component comprises from about 8% to 40% by volume of the mixture.
15. A method as claimed in claim 14 wherein the organic component is initially dampened with a NaCl solution prior to being added to the mixture.
16. A barbecue brick formed by the method as claimed in any one of claims 7 to 15.
17. A method of increasing the porosity of barbecue bricks comprising:
a) applying an aqueous silicate solution to the surface of said bricks; and, b) heating said bricks to cause frothing of said silicate solution thereby resulting in a porous surface on said brick.
a) applying an aqueous silicate solution to the surface of said bricks; and, b) heating said bricks to cause frothing of said silicate solution thereby resulting in a porous surface on said brick.
18. A method as claimed in claim 17 wherein the solution comprises aqueous sodium silicate and/or aqueous potassium silicate.
19. A substance comprising an aqueous silicate solution for use in increasing the porosity of barbecue bricks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2071740 CA2071740A1 (en) | 1992-06-19 | 1992-06-19 | Barbecue brick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2071740 CA2071740A1 (en) | 1992-06-19 | 1992-06-19 | Barbecue brick |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2071740A1 true CA2071740A1 (en) | 1993-12-20 |
Family
ID=4150049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2071740 Abandoned CA2071740A1 (en) | 1992-06-19 | 1992-06-19 | Barbecue brick |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2071740A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018204331A1 (en) * | 2017-05-01 | 2018-11-08 | Fuel Tech, Inc. | Controlling slagging and/or fouling in furnaces burning biomass |
-
1992
- 1992-06-19 CA CA 2071740 patent/CA2071740A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018204331A1 (en) * | 2017-05-01 | 2018-11-08 | Fuel Tech, Inc. | Controlling slagging and/or fouling in furnaces burning biomass |
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