DE1127269B - Process for the protection of furnaces against attack by slag - Google Patents
Process for the protection of furnaces against attack by slagInfo
- Publication number
- DE1127269B DE1127269B DEB57441A DEB0057441A DE1127269B DE 1127269 B DE1127269 B DE 1127269B DE B57441 A DEB57441 A DE B57441A DE B0057441 A DEB0057441 A DE B0057441A DE 1127269 B DE1127269 B DE 1127269B
- Authority
- DE
- Germany
- Prior art keywords
- slag
- ramming
- bentonite
- anorthite
- spoke
- 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.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 7
- 229910000278 bentonite Inorganic materials 0.000 claims description 9
- 239000000440 bentonite Substances 0.000 claims description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 9
- 239000005995 Aluminium silicate Substances 0.000 claims description 8
- 235000012211 aluminium silicate Nutrition 0.000 claims description 8
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 8
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052661 anorthite Inorganic materials 0.000 claims description 7
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 claims description 7
- 229910052863 mullite Inorganic materials 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 239000010433 feldspar Substances 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 claims description 3
- 239000011253 protective coating Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052851 sillimanite Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- -1 about 25 "/ o Chemical compound 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052571 earthenware Inorganic materials 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
-
- 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
-
- 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
Verfahren zum Schutze von Feuerungen gegen Schlackenangriff In allen Feuerungen, in denen schmelzflüssige Schlacken auftreten, wie dies z. B. in den mit Steinkohle gefeuerten Schmelzkammerkesseln der Fall ist, kommt es zu starken Korrosionen an den Eisenteilen. Um diese Eisenteile. gegen die Einwirkung der Schlacke zu schützen, werden die Wände der Feuerräume und der benachbarten Kesselteile mit Stampfmassen überzogen, die neben Kaolin und Bentonit in überwiegenden Mengen Chromerz oder Siliziumcarbid enthalten.Procedure to protect furnaces against slag attack In all Furnaces in which molten slags occur, as z. Tie is the case with coal-fired melting chamber boilers, it comes to strong Corrosion on the iron parts. About these pieces of iron. against the action of the slag to protect the walls of the firebox and the adjacent boiler parts with Ramming bodies covered, in addition to kaolin and bentonite, in predominant amounts of chrome ore or contain silicon carbide.
Man hat versucht, durch empirische. Variation der Zusammensetzung der Stampfmassen eine höhere Widerstandsfähigkeit gegen geschmolzene Schlacken zu erreichen. Auch überzieht man die Stampfmassen oft zusätzlich mit vanadiumhaltigen überzügen, die schlackeabweisend wirken. Die Schlackenschmelzen greifen aber auch diese Stampfmassen zum Teil stark an und setzen damit ihre Schutzwirkung teilweise herab oder heben sie völlig auf.One tried by empirical. Variation in composition the ramming masses have a higher resistance to molten slag reach. The ramming masses are also often coated with vanadium-containing materials coatings that have a slag-repellent effect. But the slag melts also take effect these ramming masses partly strongly and thus partly set their protective effect down or cancel them out entirely.
Es wurde nun gefunden, daß man zu einer wesentlichen Verbesserung des Schutzes der Feuerungen gegen die Schlackenangriffe gelangt, indem man Stampfmassen als Schutzüberzüge verwendet,. deren Hauptbestandteile aus denjenigen Stoffen bestehen, die sich beim Erkalten der Schlacke zuerst und/oder in überwiegender Menge abscheiden.It has now been found that there is a substantial improvement the protection of the furnaces against the slag attacks is achieved by ramming masses used as protective coatings. whose main components consist of those substances which are deposited first and / or in a predominant amount when the slag cools.
Die Wirkung der erlmdungsgemäßen Stampfmassen ist auf minerogenetischer Grundlage ohne Schwierigkeiten zu erklären. In steinkohlegefeuerten Sähmelzkammerkesseln scheiden sich z. B. aus ',m# 0,-Si 0,-reichen Schlackeschmelzen an der Grenzschicht »flüssige Schlacke/Stanipfmassen« nach den Gesetzen der Phasengleichgewichte Korund (A1, 03) und Mullit (3 A12 03 * 2 Si 0.) ab. Die Schlackenschmelze ist also an dieser Grenzfläche bei den dort herrschenden Temperaturen an Korund und Mullit übersättigt. Besteht die Stampfmasse aus einem der beiden Minerale oder aus einer Mischung von beiden, so kann infolge der übersättigung keine Korrosion der Stampfmasse erfolgen. Dasselbe, gilt für die calciumreiche Schlacke, die an der Grenzfläche »flüssige Schlacke/Stampfmasse« Anorthit (Kalkfeldspat =Ca0-AI,01,*2Si0,) ausscheidet, sofern die Stampfmasse. vorwiegend aus Anorthit besteht.The effect of the ramming compounds according to the invention can be explained without difficulty on a mineralogenetic basis. In coal-fired Sähmelzkammerkessel z. B. from ', m # 0, -Si 0, -rich slag melts at the boundary layer "liquid slag / Stanipfmassen" according to the laws of phase equilibrium corundum (A1, 03) and mullite (3 A12 03 * 2 Si 0) . The molten slag is therefore oversaturated with corundum and mullite at this interface at the temperatures prevailing there. If the rammed earth consists of one of the two minerals or a mixture of both, the ramming cannot corrode due to the oversaturation. The same applies to the calcium-rich slag that precipitates anorthite (lime feldspar = Ca0-Al, 01, * 2Si0,) at the interface between "liquid slag / rammed earth", provided that the rammed mass. consists mainly of anorthite.
Falls die Schlacke, wie, das z. B. bei Steinkohlenfeuerung im allgemeinen zutrifft, vornehmlich aus A12 0.3 ' Si 02-Verbindungen besteht, so soll demnach die Stampfmasse neben ihren üblichen Bindemitteln, wie z. B. Kaolin und Bentonit, überwiegend Korund und/oder Mullit enthalten. Besonders bewährt haben sich z. B. Stampfmassen aus etwa 7011/o Korund, etwa 25 11/o Kaolin und etwa 5 1/o Bentonit und solche aus etwa 70,1/o Mullit, etwa 25"/o, Kaolin und etwa 5% Bentonit. An Stelle von Muffit kann ganz oder teilweise Sillimanit (A4 03 - Si 0.) verwendet werden, wobei man für den Fall eines gleichmäßig zusammengesetzten Schlackenanfalls. Stampfmassen mit besonders hoher Widerstandsfähigkeit durch genaue Ab- stimmung des Verhältnisses von Korund zu Mullit und/oder Sillimanit herstellen kann. Eine für saure, A12 03-Si 0.-reiche Schlacken hervorragend bewährte Stampfinasse besteht z. B. aus, etwa 35 1/o Korund, Mullit, 25-1/o Kaolin und 5% Bentonit.If the slag, such as the z. B. generally applies to hard coal firing, primarily consists of A12 0.3 ' Si 02 compounds, so the ramming mass should therefore in addition to its usual binders, such as. B. kaolin and bentonite, predominantly corundum and / or mullite. Have particularly proven z. B. ramming of about 7011 / o aluminum oxide, about 25 11 / o kaolin and about 5 1 / o bentonite and those of about 70.1% / o mullite, about 25 "/ o, kaolin and bentonite, about 5. In place of Muffit can be used in whole or in part, sillimanite (A4 03 - Si 0.), whereby, in the event of a uniformly composed slag accumulation, ramming compounds with particularly high resistance can be produced by precisely matching the ratio of corundum to mullite and / or sillimanite. A rammed earthenware that has proven to be excellent for acidic, A12 03-Si 0. -rich slag consists, for example, of about 35 1 / o corundum, mullite, 25-1 / o kaolin and 5% bentonite.
Falls die Schlacke erdalkalisch (insbesondere calciumreich) ist, soll die Stampfmasse im wesentlichen aus Anorthit oder einem ähnlichen Mineral bestehen. Anorthit kann z. B. ganz oder teilweise durch Kalknatronfeldspat ersetzt werden, der im Interesse einer ausreichenden Temperaturbeständigkeit mindestens 17 % Ca 0 enthalten soll. Eine gegenüber erdalkalireicher Steinkohlenschlacke besonders korrosionsfeste Stampfmasse besitzt z. B. folgende. Zusammensetzung: etwa 70#l/e Anorthit, etwa 25"/o, Kaolin und etwa 51/o Bentonit oder etwa 70"/o Kalknatronfeldspat mit mindestens 17,1/oCa0, etwa 25,04 Kaolin und etwa 5 % Bentonit. Letzterer kann in jedem Fall durch Calciumbentonit ersetzt werden. Es liegt auf der Hand, daß die einzelnen Komponenten der Stampfmassen durch solche ähnlicher Zusammensetzung ersetzt werden können.If the slag is alkaline earth (especially rich in calcium), the rammed earth should consist essentially of anorthite or a similar mineral. Anorthite can e.g. B. be completely or partially replaced by soda lime feldspar, which should contain at least 17 % Ca 0 in the interests of adequate temperature resistance. A particularly corrosion-resistant ramming mass compared to alkaline earth coal slag has z. B. the following. Composition: about 70 "/ o anorthite, about 25" / o kaolin and about 51 / o bentonite or about 70 "/ o soda lime feldspar with at least 17.1 / o Ca0, about 25.04 kaolin and about 5 % bentonite. The latter can in any case be replaced by calcium bentonite. It is obvious that the individual components of the ramming mix can be replaced by those of a similar composition.
Claims (2)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB57441A DE1127269B (en) | 1960-04-11 | 1960-04-11 | Process for the protection of furnaces against attack by slag |
| GB1240861A GB975329A (en) | 1960-04-11 | 1961-04-06 | Improvements in or relating to furnace protection materials |
| BE602442A BE602442A (en) | 1960-04-11 | 1961-04-11 | Process for protecting the fayers against slag attack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB57441A DE1127269B (en) | 1960-04-11 | 1960-04-11 | Process for the protection of furnaces against attack by slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1127269B true DE1127269B (en) | 1962-04-05 |
Family
ID=6971698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEB57441A Pending DE1127269B (en) | 1960-04-11 | 1960-04-11 | Process for the protection of furnaces against attack by slag |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1127269B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2640927A1 (en) * | 1975-09-08 | 1977-03-10 | Dresser Ind | MONOLITHIC REFRACTORY MATERIAL |
| EP0087762A1 (en) * | 1982-02-26 | 1983-09-07 | Gienanth-Werke Hochstein AG | Process for increasing the life of refractory linings for metallurgical furnaces |
-
1960
- 1960-04-11 DE DEB57441A patent/DE1127269B/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2640927A1 (en) * | 1975-09-08 | 1977-03-10 | Dresser Ind | MONOLITHIC REFRACTORY MATERIAL |
| EP0087762A1 (en) * | 1982-02-26 | 1983-09-07 | Gienanth-Werke Hochstein AG | Process for increasing the life of refractory linings for metallurgical furnaces |
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