DE653783C - Covering agent for lead - Google Patents
Covering agent for leadInfo
- Publication number
- DE653783C DE653783C DEK143229D DEK0143229D DE653783C DE 653783 C DE653783 C DE 653783C DE K143229 D DEK143229 D DE K143229D DE K0143229 D DEK0143229 D DE K0143229D DE 653783 C DE653783 C DE 653783C
- Authority
- DE
- Germany
- Prior art keywords
- lead
- covering agent
- covering
- alkali
- carbonaceous
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/48—Metal baths
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Description
Abdeckmittel für Bleibäder Es ist bekannt, die zur Wärmebehandlung von Eisenwerkstoffen, wie Drähten, Bändern usw., dienenden Bleibäder zur Verminderung der Bleioxydation mit ,Holzkohle oder Steinkohlengrus rund ähnlichen Stoffen abzudecken. Die damit erreichte Verringerung des Bleiverbrauches ist jedoch eine unvollkommene. Das Schrifttum gibt je nach Wärmebehandlung und Eisenwerkstoff Bleiverbrauchsziffern von q. bis ro kg für die Tonne behandelten Werkstoff an.Covering agents for lead baths It is known that for heat treatment of ferrous materials, such as wires, tapes, etc., lead baths are used to reduce them to cover lead oxidation with materials similar to charcoal or bituminous coal. The resulting reduction in lead consumption is, however, imperfect. Depending on the heat treatment and iron material, the literature gives lead consumption figures from q. up to ro kg per ton of treated material.
DieUrsachen für die mit dem bisherigen VerfaAren verbundenen Bleiverluste liegen einmal in der nicht vollständigen Verhinderung der Oxydation des Bleies und dann darin begründet, daß der wärmebehandelte Werkstoff beim Verlassen des Bades Blei in Tropfenform mitnimmt, welches ebenso wie der Werkstoff zufolge der hohen Temperatur einer mehr oder wenigerstarkenOxydationunterliegt. Schließlich tritt bei der in Anwendung stehenden Arbeitsweise noch der Nachteil auf, daß die kohligen Abdeckmittel durch Abbrand einem erheblichen Verbrauch unterworfen sind.The causes of the lead losses associated with the previous procedure lie in the incomplete prevention of lead and oxidation then based on the fact that the heat-treated material when leaving the bath Lead takes with it in the form of drops, which, like the material, is due to the high Temperature is subject to a more or less strong oxidation. Eventually occurs in the working method in use still has the disadvantage that the carbonaceous Covering means are subject to considerable consumption by burning.
Den geschilderten Unvollkommenheiten kann-dadurch begegnet werden, daß die verwendeten kohligen Abdeckmittel kräftig mit Alkalicarbonaten vermischt zur Anwendung gelangen. Kohle-Soda-Gemische sind-als ausgezeichnete Reduktionsmittel für Bleioxyd bekannt, so daß etwa entstehende Bleioxyde von dieser Abdeckschicht dauernd zu Blei reduziert werden. Ferner hat die praktische Anwendung gezeigt, daß die wärmebehandelten Werkstoffe unter Anwendung des beschriebenen Abdeckmittels bleitropfenfrei die Bäder verlassen. Darüber hinaus bildet das Alkalicarbonat auf dem behandelten Werkstoff eine hauchdünne Deckschicht, die eine Oxydation des Werkstoffes nach Verlassen des Bleibades stark vermindert. Schließlich-sind, wie die Praxis gezeigt hat, Abdeckmittel der vorbeschriebenen Zusammensetzung einem erheblich geringeren Abbrand unterworfen als die bisher ausschließlich verwendeten kohligen @ Abdeckmittel.The described imperfections can be countered by that the carbonaceous covering agent used is mixed vigorously with alkali carbonates come into use. Coal-soda mixtures are excellent reducing agents known for lead oxide, so that any lead oxides formed from this cover layer are constantly reduced to lead. Furthermore, practical application has shown that the heat-treated materials using the masking agent described Leave the baths free of lead drops. In addition, the alkali carbonate forms a wafer-thin top layer on the treated material, which oxidizes the material greatly reduced after leaving the lead bath. Finally-are how practice has shown, masking agent of the composition described above is considerably less Subject to burn-up than the carbonaceous covering agents that have hitherto been used exclusively.
Als Grundstoff für das Abdeckmittel nach der Erfindung können in gleicher Weise wie bisher Holzkohle, Steinkohlengrus usw. verwendet werden; besonders bewährt hat sich jedoch Braunkohlengrude. Die Vermischung mit Alkalicarbonaten kann entweder durch Einpudern mit Alkalicarbonatoder, was wesentlich wirksamer und vorteilhafter ist, durch Tränken mit einer konzentrierten Alkali-Carbonat-Lösung erfolgen. Hierfür eignen sich am besten durchlässige kohle- , haltige Stoffe, wie z. B. Grude, Holzkohle usw. Die Mengenverhältnisse zwischen Grundstoff und Alkalicarbonat können je nach Verwendungszweck in weiten Grenzen veränderlich sein. Auf Grund der praktischen Ergebnisse reichen Anteile an-Alkalicarbonat von 5 bis 15 0/0 in den meisten Fällen aus.As a base material for the covering means according to the invention, charcoal, bituminous coal, etc. can be used in the same way as before; However, brown coal grude has proven to be particularly effective. Mixing with alkali carbonates can be done either by powdering with alkali carbonate or, which is much more effective and advantageous, by soaking with a concentrated alkali carbonate solution. Permeable carbonaceous substances are best suited for this, such as B. Grude, charcoal, etc. The proportions between base material and alkali metal carbonate can vary widely depending on the intended use. Based on the practical results, proportions of alkali metal carbonate of 5 to 1 5 % are sufficient in most cases.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK143229D DE653783C (en) | 1936-08-08 | 1936-08-08 | Covering agent for lead |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK143229D DE653783C (en) | 1936-08-08 | 1936-08-08 | Covering agent for lead |
Publications (1)
Publication Number | Publication Date |
---|---|
DE653783C true DE653783C (en) | 1937-12-02 |
Family
ID=7250367
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEK143229D Expired DE653783C (en) | 1936-08-08 | 1936-08-08 | Covering agent for lead |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE653783C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0339703A1 (en) * | 1988-04-25 | 1989-11-02 | N.V. Bekaert S.A. | Prevention of lead entrainment |
-
1936
- 1936-08-08 DE DEK143229D patent/DE653783C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0339703A1 (en) * | 1988-04-25 | 1989-11-02 | N.V. Bekaert S.A. | Prevention of lead entrainment |
US4954183A (en) * | 1988-04-25 | 1990-09-04 | N.V. Bekaert S.A. | Lead heat treatment of wire with prevention of lead entrainment |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE653783C (en) | Covering agent for lead | |
DE663206C (en) | Process for the distillation of hydrogen peroxide | |
DE382500C (en) | Starting material for the production of non-oxidizable chrome steel | |
DE1919066C3 (en) | Method of surface hardening by nitriding | |
DE1508365A1 (en) | Process for the manufacture of oriented silicon iron | |
DE891484C (en) | Method for soldering metal parts by immersion in a molten salt bath | |
DE709361C (en) | Process for modifying silicon-containing aluminum alloys | |
AT264432B (en) | Method and device for descaling iron billets | |
AT131586B (en) | Process for improving aluminum or aluminum alloys and aluminum-containing alloys. | |
DE586078C (en) | Process for removing arsenic and antimony from iron and manganese ores | |
DE519727C (en) | Process for the production of porous, e.g. B. Metal oxide moldings that can be used as electrodes | |
DE823218C (en) | Process for refining copper | |
DE439637C (en) | Process for the production of iron chromium alloys | |
DE931411C (en) | Process to increase the cold formability with low core losses of Si steel sheets | |
DE933787C (en) | Thermal process for metal extraction by reducing their oxygen compounds | |
DE693328C (en) | ||
DE669315C (en) | Process for increasing the azotability of calcium carbide | |
DE618463C (en) | Process for the production of zinc from zinc dust by melting in the presence of ammonium chloride | |
AT301892B (en) | Process for preventing the formation of suds (oxidation) in goldware production | |
DE704036C (en) | Process for the production of centrifugal castings with a soft outer skin | |
AT150492B (en) | Process for the dressing of animal fibers, in particular hair, for the manufacture of felt. | |
CH140790A (en) | Process for thermal tempering of non-cementable metals and alloys. | |
DE928769C (en) | Process for producing low carbon ferrochrome from high carbon ferrochrome | |
DE423348C (en) | Process for the production of alkaline earth nitrides | |
DE866726C (en) | Process for the extraction of raw zinc from zinc dust by smelting |