CN1177578A - Process for production of lime using waste slag discharged from industrial alkali production - Google Patents
Process for production of lime using waste slag discharged from industrial alkali production Download PDFInfo
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- CN1177578A CN1177578A CN 96109859 CN96109859A CN1177578A CN 1177578 A CN1177578 A CN 1177578A CN 96109859 CN96109859 CN 96109859 CN 96109859 A CN96109859 A CN 96109859A CN 1177578 A CN1177578 A CN 1177578A
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- calcining
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- causticized
- lime
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 48
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 48
- 239000004571 lime Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000003513 alkali Substances 0.000 title claims abstract description 26
- 239000002699 waste material Substances 0.000 title claims description 19
- 239000002893 slag Substances 0.000 title 1
- 238000001354 calcination Methods 0.000 claims description 107
- 238000001816 cooling Methods 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 230000001172 regenerating effect Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000000137 annealing Methods 0.000 abstract 6
- 238000011109 contamination Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 239000011449 brick Substances 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009993 causticizing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000003837 high-temperature calcination Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001131796 Botaurus stellaris Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/005—Lime, magnesia or dolomite obtained from an industrial by-product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to a technological process for producing lime by using offscum discharged in the production of industrial alkali and regenerating offscum for cyclic use. Said technological process includes the following steps: packing charge tank with causticized mud, placing it on the annealing car ,its optimum stacking thickness must not exceed 396 mm, its height must not exceed 1350 mm, feeding annealing car into annealing furnace to make continuous annealing, annealing temp. is 1150-1200 deg. C, and annealing time is 1.5-2 hr. Said invention possesses the advantages of protecting environment water source from contamination, simple equipment, less investment, ripe process and easy to popularize.
Description
The invention relates to the recycling of waste residues discharged in industrial alkali production, in particular to a process method for producing lime by using the waste residues discharged in the industrial alkali production
In the industrial alkali halide production process, NaOH is required to neutralize NaHCO in alkali halide3The preparation of NaOH generally adopts lime (CaO) and Na in alkali halide2CO3A causticizing method. In the causticizing process of natural alkali, alkali brine is mostly mixed with CaO, and the reaction is carried out to obtain
The comprehensive utilization of the causticized sludge waste has the following three ways:
1. because the main component of the causticized mud is CaCO3It is used as a raw material for producing cement.
2. The technology for calcining the causticized mud into lime by using a large-scale rotary furnace has mature process at home and abroad, but the investment for building factories is high, and common enterprises cannot bear the technology
3. The method for preparing light calcium carbonate and active calcium carbonate by using the causticized mud is also a good way, and needs to be tested, so that the test is successful, and the rolled product also faces a market sale problem.
The invention aims to provide a process method for producing lime by using waste residues discharged in industrial alkali production, which calcines causticized mud into lime to realize the regeneration and reutilization of waste residues discharged in the industrial alkali production, has mature process, simple equipment and less investment, and can bear the load of general soda plants
The purpose of the invention is realized as follows:
a process for preparing lime from the waste dregs generated in production of industrial alkali includes calcining the causticized mud generated in production of alkali bittern to obtain lime, and regenerating and cyclic use of waste dregs
a: dry feed process principle flow:
transporting the wet causticized mud to a sunning groundConveying the dry causticized mud into a storehouseMoveable belt feeder
The slaked mud is loaded into a container on a calcining vehicleManually pushing the calcining vehicle filled with the causticized mud to the inlet of the calcining furnace → starting a hydraulic press to push the calcining vehicle filled with the causticized mud into the initial section of the calcining furnace → feeding one calcining vehicle into the calcining furnace every 15 minutes → feeding the calcining vehicle into the initial section, and sequentially feeding the calcining vehicle into the heating section, the calcining section, the stabilizing section, the cooling section and the cooling section of the calcining furnaceCalcining vehicle outlet calcining furnace
Discharging qualified lime from the calcining vehicle into an underground lime pit:
b. the calcination temperature is 1150-1200 ℃.
c. The calcination time is controlled to be 1.5-2 hours
The object of the invention can also be achieved by the following measures:
the thickness of the stack of the causticized mud to be calcined is not more than 396mm, the width is not more than 1250mm, and the height is 1350mm is the best
The calcining furnace for calcining is a six-section heat insulation calcining furnace, the length of the calcining furnace is 66 meters, the inner net width is 1.39 meters, the distance between the top plane of the calcining furnace and the top plane of the calcining furnace is 1.39 meters, the calcining furnace is sequentially segmented into an initial section with the length of 10 meters, a preheating section with the length of 12 meters, a calcining section with the length of 14 meters, a stabilizing section with the length of 10 meters, a cooling section with the length of 10 meters, and coal adding holes are arranged at two sides of the 14.
The causticized mud entering the calcining furnace is separately filled in a charging chute device barrel, the charging chute device barrel is in a hollow straight round tube shape, is made of refractory materials with high temperature resistance and good heat conductivity coefficient, the outer diameter of the charging chute device barrel is not more than 40cm, the wall thickness of the charging chute device barrel is 2cm, the height of the charging chute device barrel is not more than 1.39m, three charging chutes are arranged in a row, and every five discharging chutes are arranged in a calcining vehicle, a plurality of calcining vehicles are connected end to end, enter from the inlet of the calcining furnace, and are slowly advanced for calcining for 1.5-2 hours.
The invention has the following positive and beneficial effects:
1. simple equipment, less investment and strong practicability
2. The causticized mud waste residue discharged by the industrial alkali factory every year can be completely treated, thereby solving the problem of no place for stacking the waste residue and protecting the environmental water source from being polluted.
3. The causticized mud is processed into lime on site, so that the waste residue is regenerated and recycled, and the lime product can be produced and sold by itself.
4. The process is mature, easy to popularize and has better economic and social benefits.
The invention will now be further described in connection with preferred embodiments with reference to the accompanying drawings in which:
FIG. 1 is a schematic of the configuration of a hopper cylinder used in the process of the present invention.
FIG. 2 is a schematic view of the present invention of a process for calcining lime mud in a calcining furnace with a calcining car in a charging chute
FIG. 3 is a view in the direction A of FIG. 2 showing the arrangement of the hopper cylinders on a calcining car.
The invention discloses a process method for producing lime by using waste residues discharged in industrial alkali production, which is characterized in that causticized mud generated in the alkali brine production process is calcined into lime, so that the waste residues are regenerated and recycled.
In a preferred embodiment, the calcining furnace for calcining is a six-section heat-insulating calcining furnace, the length of the furnace is 66 meters, the inner net width is 1.39 meters, the top plane of the calcining furnace is 1.39 meters higher than the top plane of the furnace, the calcining furnace is sequentially segmented into an initial section with the length of 10 meters, a preheating section with the length of 12 meters, a calcining section with the length of 14 meters, a stabilizing section with the length of 10 meters, a cooling section with the length of 10 meters and a cooling section with the length of 10 meters, and coal adding holes are arranged on two sides of the 14-meter calcining.
The causticized mud 4 entering the calcining furnace 3 is separately arranged in a charging chute device barrel 1 which is in a hollow straight round tube shape and is made of refractory materials with high temperature resistance and good heat conductivity, a through hole 5 for penetrating a suspender is arranged at the upper part of the top of the barrel, penetrates through the center of a circle and penetrates through the barrel walls at two sidesas shown in figure 1, the outer diameter of the through hole is not more than 40cm, the wall thickness of the through hole is 2cm, the height of the through hole is not more than 1.39m, three rows of the through hole are placed in a calcining vehicle 2 as shown in figure 3, a plurality of calcining vehicles are connected end to end, enter from an inlet of the calcining furnace 3, and are slowly moved for calcining for 1.5.
The process principle of the invention is as follows:
the main components of the causticized mud are sampled and analyzed on site, and the data are as follows:
CaCO3about 86 percent
Excess lime is about 3%
Residual alkali content is about 2%
About 8% of water-insoluble substance
Because the main component of the causticized mud is CaCO3This has the basic condition for calcining lime.Lime is based on CaCO3In the range of 900 to 1300Decomposition of CO at a temperature of DEG C2The basic principle of CaO formation after gasification mainly comprises the following chemical reactions:
the main operating conditions of the process for calcining causticized mud of the invention
(1) The main factors influencing the quality of lime calcined by using causticized mud as a raw material include:
CaCO3at 900 deg.C, CO2The gas begins to decompose and rises from CaCO with the calcining temperature3CO produced by decomposition2The gas is gradually increased, when the calcining temperature reaches 1300 ℃, the chemical reaction stops, and CO2End of decomposition of gas, CO2From CaCO gas3Almost all of them are solved. When the calcining temperature is too high, and the time is longer, not only CaCO3Medium and complete decomposition of CO2Gas being released completely, CaCO3The residual alkali and other impurities in the lime are melted, the lime is sintered, and a wall build-up and a nodule are formed, wherein the color of the lime is black, the lime is called burnt lime, the burnt lime is not easy to dissolve, and the consumption of the lime is increased in use. It is known from a large number of industrial scale-up tests that the lime calcined with lime mud suitable for this purpose is pale carclazyte yellow in colour, preferably slightly greenish. If the calcination temperature is lower, the retention time of the causticized mud in the calcination section is shorter, CaCO3CO in2The lime which is calcined cannot be completely decomposed, the color of the calcined lime is light-colored, the calcined lime is called as under-calcined lime, and the most suitable calcining temperature is 1150-1200 ℃.
(2) Influence of calcination time:
when the calcination temperature is constant, the calcination time has a direct influence on the quality of lime. If the residence time of the causticized mud in the high-temperature calcination exceeds CO2The time required for decomposition occurs with the occurrence of overburning, and the longer the time is exceeded, the more severe the overburning occurs. In contrast, when the retention time of the causticized mud in the calcination section is less than that of CO2The time required for decomposition occurs due to under-burning. Pass through the testAnd when the calcination temperature is 1150-1200 ℃ and the calcination time is controlled to be 1.5-2 hours, the calcined lime has the best quality.
(3) The influence of the accumulation mode and the accumulation amount ofthe causticized mud:
calcining lime with causticized mud and lime with limestone, although both use high-temperature calcination3Decomposed to release CO2The reaction mechanism of (1) and (2) are different in the process, equipment and calcination method, although the main component of the causticized mud is CaCO3However, it is present in the form of a very fine powder, and if it is piled up together to be calcined, and the volume is slightly larger, the middle of the piled body is difficult to be burnt due to low porosity and poor air permeability, and the phenomenon of internal under-burning and external over-burning inevitably occurs. Therefore, the accumulation mode and the accumulation amount of the causticized mud are the main problems to be solved when the causticized mud is calcined.
Through trial and error, two stacking approaches have been identified: one way is to pile the dry causticized mud in a special container with certain required size for calcination; the other way is to mix and mix causticized mud with certain humidity and binder evenly and then press the mixture into block-shaped objects with certain size and place the block-shaped objects on a calcining car for calcining. Compared with the two modes, the investment of the latter is higher than that of the former, but the operation is convenient and the product quality is good.
No matter which stacking mode is adopted for calcination, in order to ensure the quality of the produced lime, the stacking quantity of the causticized mud on a calcination vehicle must be strictly controlled to be too large, and the calcination is not thorough; the quantity of the accumulated causticized mud is too small, the calcining temperature and time are not well controlled, the overburning phenomenon is easy to occur, meanwhile, the processing capacity of the causticized mud is influenced, and the calciningequipment is not easy to select types. Repeated experiments show that the thickness of the causticized mud stack is not more than 396mm, the width is not more than 1250mm, and the height is 1350 mm.
(4) Influence of flame distribution in calciner
The control of the temperature in each section of the calciner is very critical, and especially the distribution of the flame in the calcination section is very important. The fuel of the calcining furnace is coal, coal feeding holes are arranged at two sides of a 14 m calcining section in the middle of the calcining furnace, the flame distribution in the section is uniform, the intensity is consistent, the temperature is always kept constant, and the key part influencing the quality of lime is realized. In addition to the above main operating conditions having an influence on the quality of the calcined lime, the content of residual alkali and the amount of other impurities in the lime mud have a certain influence on the quality of the lime.
(5) The selection of the calcining equipment of the invention:
the equipment which has the advantages of less investment, convenient operation, low running cost, meeting the process requirements and meeting the use requirements of the calcined lime quality is selected, and is a very critical ring. The rotary furnace adopting the modern metal structure has high investment which cannot be borne by alkali plants, and the operation of the traditional vertical circular batch furnace has the advantages of low investment, high energy consumption, low yield, high labor intensity and poor working condition.
The invention uses a semi-mechanized multi-stage, such as six-stage, heat-insulating calciner which can be produced basically continuously, has reasonable fuel consumption, not too much labor intensity and satisfactory production capacity, in one embodiment, the length ofthe calciner is 66 m, the inner net width is 1.39m, the plane of the calciner roof is 1.39m away from the furnace top, a sand-sealed heat-insulating groove is arranged in the calciner, a furnace wall is provided with a plurality of smoke absorption holes 30, each stage is provided with a thermocouple connected with a temperature indicator outside the calciner, the length of the calcining stage of the calciner is 14 m, 12 m in the preheating stage and 10 m in the hidden stage are built by first-stage refractory bricks, the preheating stage, the hidden stage and the rest stages are built by second-stage refractory bricks, the thickness of the preheating stage, the hidden stage and the rest stages are different according to the temperature, the refractory bricks are provided with heat-insulating materials and red bricks, the two sides outside the calciner are reinforced by channel steel 3 m to maintain the service life, equipment matched with a calcining vehicle and a circulating track, feeding and discharging hydraulic machine, feeding machine, finished product conveyer and other general equipment.
In order to prevent the frame, wheels, bearings, steel rails and other metal materials of the calcining car from deforming and losing strength at high temperature, heat insulation materials and refractory materials 6 are laid on the frame, when the calcining car runs in a furnace, two sides of the calcining car are clamped in the concave grooves 7 on the inner wall of the furnace, and the heat insulation grooves filled with sand are arranged on two sides of the inner wall of the furnace for sealing, so that heat in the furnace is separated from the lower part of the frame, and the metal materials are prevented from being influenced by high temperature and lose strength, which is shown in figure 2.
Claims (4)
1. A process method for producing lime by using waste residues discharged in industrial alkali production is to calcine causticized mud generated in the production process of alkali brine into lime so as to regenerate and recycle the waste residues, and is characterized in that: the process method comprises
a: dry feed process principle flow:
transporting the wet causticized mud to a sunning groundConveying the dry causticized mud into a storehouse
Moveable belt feeder
The causticized mud is loaded into a container on a calcining vehicleManually pushing the calcining car filled with the causticized mud to the inlet of the calcining furnace → starting a hydraulic press to push the calcining car filled with the causticized mud into the initial section of the calcining furnace → feeding one calcining car into the calcining furnace every 15 minutes → feeding the calcining car into the initial section, and sequentially feeding the calcining car into a preheating section, a calcining section, a stabilizing section and a cooling section of the calcining furnace. Cooling sectionCalcining vehicle outlet calcining furnace
Discharging the qualified lime from the calcining vehicle into an underground lime pit;
b. the calcining temperature is 1150-1200 DEG C
c. The calcination time is controlled to be 1.5 to 2 hours
2. The process method for producing lime by using waste residues discharged in the production of industrial alkali according to claim 1, which is characterized in that: the thickness of the stack of the causticized mud to be calcined is not more than 396mm, the width is not more than 1250mm, and the height is 1350mm is the best
3. The process method for producing lime by using waste residues discharged in the production of industrial alkali of a factory as claimed in claim 1, wherein: the calcining furnace for calcining is a six-section heat insulation calcining furnace, the length of the furnace is 66 meters, the inner net width is 1.39 meters, and the top of the calcining vehicle top flat picture is 1.39 meters high. The calcining furnace is sequentially divided into an initial section with the length of 10 meters, a preheating section with the length of 12 meters, a calcining section with the length of 14 meters, a stabilizing section with the length of 10 meters, a cooling section with the length of 10 meters and a cooling section with the length of 10 meters, and coal adding holes are arranged on two sides of the 14-meter calcining section.
4. The process method for producing lime by using waste residues discharged in the production of industrial alkali according to claim 1, which is characterized in that: the causticized mud entering the calcining furnace is separately filled in a charging chute device barrel, the charging chute device barrel is made of a hollow straight round tube-shaped refractory material with high temperature resistance and good heat conductivity coefficient, the outer diameter of the charging chute device barrel is not more than 40cm, the wall thickness is 2cm, the height is more than 1.39m, three charging chutes are arranged in one row, and five charging chutes are arranged in one calcining vehicle, a plurality of calcining vehicles are connected end to end, enter from the inlet of the calcining furnace, and are slowly moved for 1.5-2 hours to calcine the whole process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96109859 CN1177578A (en) | 1996-09-23 | 1996-09-23 | Process for production of lime using waste slag discharged from industrial alkali production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96109859 CN1177578A (en) | 1996-09-23 | 1996-09-23 | Process for production of lime using waste slag discharged from industrial alkali production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1177578A true CN1177578A (en) | 1998-04-01 |
Family
ID=5120669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96109859 Pending CN1177578A (en) | 1996-09-23 | 1996-09-23 | Process for production of lime using waste slag discharged from industrial alkali production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1177578A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150297026A1 (en) * | 2012-11-06 | 2015-10-22 | Seb Sa | Cooking Device Presenting a Cooking Surface Including a Non-Oxide or at Least Partially Non-Oxide Ceramic Non-Stick Coating, and Culinary Article or Electric Household Cooking Appliance Including Such a Cooking Device |
-
1996
- 1996-09-23 CN CN 96109859 patent/CN1177578A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150297026A1 (en) * | 2012-11-06 | 2015-10-22 | Seb Sa | Cooking Device Presenting a Cooking Surface Including a Non-Oxide or at Least Partially Non-Oxide Ceramic Non-Stick Coating, and Culinary Article or Electric Household Cooking Appliance Including Such a Cooking Device |
| US10299624B2 (en) * | 2012-11-06 | 2019-05-28 | Seb S.A. | Cooking device presenting a cooking surface including a non-oxide or at least partially non-oxide ceramic non-stick coating, and culinary article or electric household cooking appliance including such a cooking device |
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