US3923499A - Method of removing solids (e.g. copper dross) from molten-lead baths - Google Patents

Method of removing solids (e.g. copper dross) from molten-lead baths Download PDF

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Publication number
US3923499A
US3923499A US399511A US39951173A US3923499A US 3923499 A US3923499 A US 3923499A US 399511 A US399511 A US 399511A US 39951173 A US39951173 A US 39951173A US 3923499 A US3923499 A US 3923499A
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United States
Prior art keywords
bath
molten
lead
layer
solids
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Expired - Lifetime
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US399511A
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English (en)
Inventor
Peter Manthey
Hermann Matthies
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GEA Group AG
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Metallgesellschaft AG
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Publication date
Priority claimed from DE19722247737 external-priority patent/DE2247737C3/de
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
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Publication of US3923499A publication Critical patent/US3923499A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • F27D3/1554—Equipment for removing or retaining slag for removing the slag from the surface of the melt
    • F27D3/1572—Equipment for removing or retaining slag for removing the slag from the surface of the melt by suction
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B13/00—Obtaining lead
    • C22B13/06—Refining

Definitions

  • the present invention relates to a method of removing solid layers overlying molten-lead baths, e.g. in the refining of lead.
  • fine-grained solid layers are frequency formed on the lead bath and have a high bulk density. These layers must be removed and various devices have been provided for this purpose. For example, fine-grained copper dross collects on the surface of a lead bath in the refining of crude lead in the form of a crust or other relatively stiff layer and may be removed by perforated scoops, by foam methods and simply by skimming the solids from the bath.
  • Another object of the invention is to provide a method of removing copper dross from a molten-lead bath wherein the removal is relatively efficient and complete and does not adversely affect the economics of a lead-refining process.
  • the invention comprises loosening the layers of solid material upon a liquid bath and simultaneously drawing the loosened solid material off the surface of the bath pneumatically by suction.
  • the solids are loosened mechanically, e.g. by mechanically disturbing the surface layer or crust with a rotating beater such as a beating rod, chain, roll or blade wheel having horizontally extending axes and radially projecting or outwardly projecting members or tines which engage the layer of solids or crust.
  • a rotating beater such as a beating rod, chain, roll or blade wheel having horizontally extending axes and radially projecting or outwardly projecting members or tines which engage the layer of solids or crust.
  • the loosening step may be carried out pneumatically, i.e., by directing jets of gases under pressure against the crust or layer, preferably between the crust or solid layer and the liquid phase, i.e., at the interface between the solid and liquid phases.
  • the gases which are used are preferably heated to avoid cooling of the liquid phase, i.e., the molten lead.
  • the solids are drawn off under suction simultaneously with loosening and mechanical breakup of the crust by a gas stream and are classified or separated by particle size or content.
  • the latter separation may be accomplished by a cyclone and a bag filter provided downstream of the cyclone.
  • the dust collected in the cyclone has a relatively high copper content while the dust collected in the bag filter has a high tin content.
  • the products recovered from the two classification stages may then be supplied to further processing operations, e.g. a copper-recovery and a tinrecovery process.
  • the apparatus for carrying out the present invention thus advantageously comprises a hood provided with an elongated opening at least on one longitudinal side, a suction conduit disposed above the opening and connected to the hood, and crust-loosening means within the opening or disposed adjacent the latter for loosening the solid layer or crust upon. the surface of the molten-metal bath.
  • the loosening means may be disposed ahead of or in the opening or within the hood and, at any rate, are preferably connected therewith.
  • the underside of the hood is open and the edges around the opening are sealed by the layer of solids and/or by the bath of molten metal.
  • the loosening means consist of rotating beaters
  • the beaters such as beating rods, chains, rolls, horizontally arranged blade wheels and the like, are disposed approximately along the longitudinal dimension of the opening. The direction of rotation of the beaters is selected, so that the solids are loosened toward and are displaced by the beaters in the direction of the opening.
  • hood walls extend at right angles to the surface of the molten material and the interface between the solid layer or crust and the molten bath.
  • This configuration has been found to yield an especially effective separation as the solids are entrained in the gas stream directly upwardly while entrainment of liquid particles is avoided to a considerable degree.
  • An airflow control disk may be incorporated in the vacuum duct so that the secondary air for controlling the temperature of the entrainin g gas stream can be introduced at a controlled rate, Le, a rate which does not adversely affect the solids-entraining suction at the openmg.
  • the suction head may be moved over the stationary crust or solid layer or the solid layer may be moved on the bath past a stationary suction head below the latter.
  • means may be provided for sweeping the suction head over the surface of the bath while, in the latter case, means may be provided for displacing the bath.
  • Such means may include stirring devices and the like.
  • both a head-displacement and a bath-displacement means may be utilized.
  • FIG. 1 is a diagrammatic perspective view showing a suction head in accordance with the present invention, provided with rotating beaters, for loosening the crust or solid material immediately ahead of the opening;
  • FIG. 2 is a view similar to FIG. 1 of a suction head using a pneumatic crust-loosening device
  • FIG. 3 is a transverse sectional view, in diagrammatic form, showing a suction head in conjunction with rotatable beater rods disposed in the hood;
  • FIG. 4 is a vertical cross-section, partly in diagrammatic form, illustrating still another feature of the invention.
  • FIG. 1 we have shown a hood 2 having a longitudinal side 1 provided with an elongated opening 3 along a layer of solid material or crust disposed upon a bath of molten lead.
  • a suction conduit 5 opens at the top of the upwardly convergent head within the latter and loosening means 6a is disposed immediately ahead of the opening 3 or within the latter.
  • the means for mounting the beater 6a upon the hood are not shown nor have we illustrated the 'means for driving the beater. Such means may be identical to those illustrated in connection with FIG. 3.
  • the loosening means 6a comprises a plurality of angularly spaced radially extending beating vanes and rotate in the direction of the arrow, i.e., in the clockwise sense as seen in FIG. 1.
  • the beater 6a loosens the cooper dross crust or layer on the molten lead and the broken-up solids are withdrawn by suction through conduit 5.
  • the loosening means 6b comprises a pipe formed with holes directed toward the opening 3 and forming nozzles for air jets which are inclined somewhat downwardly so that the air jet is directed at the interface between the solid crust and the moltenlead bath.
  • the pneumatic jet from nozzle pipe 6b thus lifts the crust and breaks the same into small pieces which are withdrawn by suction as described in connection with FIG. 1.
  • Heating means H is connected to the duct 6b feeding the loosening air to the nozzle pipe 6b so as to prevent excessive cooling of the molten metal at the interface at which the loosening jets impinge.
  • the loosening means 6a consists of beating rods mounted in the hood 2.
  • the entire hood is mounted in the holder 7 and by means of a rope drive anchored at 8 to the system can be raised and lowered toward the surface of the melt.
  • a frame 9 supports the apparatus over the molten material and a motor 10 on this frame drives the beating drum 60 via a chain 11.
  • An inspection door is provided at 12 to permit the beater 6a to be viewed and an air-control disk 13 permits induction of limited quantities of secondary air for cooling the primary airstream.
  • the system of FIG. 3 operates in the manner previously described.
  • FIG. 4 we have shown an embodiment of the invention which makes use of a suction hood 29 of any of the type shown in FIGS. 1-3.
  • the suction hood 29 of any of the type shown in FIGS. 1-3.
  • molten lead 21 is received in a vat 20 and may be rotated or stirred by a plurality of paddles 23 and 24 mounted upon a stirring rod or shaft 22 which is driven by a speed-reduction transmission 25 from a stirrerdrive motor 26.
  • a copper-dross layer 28 overlies the upper surface 27 of the lead bath and is drawn into the hood 29 which is provided with a beater or pneumatic crust-loosening device as previously described.
  • the hood 29 is carried by a suction duct 30 which is rotatable about the axis of the vat in a bearing 31 by a transmission 32 of a hood-rotating motor 33.
  • a distributor 34 on a stationary pipe 35 communicates with the rotatable duct 30 to maintain suction therein.
  • the pipe 35 opens tangentially into a cyclone separator 36 from which the gas is withdrawn via line 37 into a bag filter 38 connected to a suction blower 39.
  • the system of FIG. 4 operates as described in connection with FIGS. 13 except that rotation of the hood or of the bath serves to bring the solid layer into the hood opening for evacuation with the gas stream.
  • SPECIFIC EXAMPLE Using a stationary suction apparatus as shown in FIG. 3, 5.5 metric tons of dry copper dross, which wasas fine as dust, was evacuated within a period of three hous from a constantly stirred melting vessel containing molten lead at a temperature of about 500C.
  • the vessel had a diameter of 3.6 meters and contained approximately metric tons of the molten lead.
  • the hood had a length and width of 55 X 48 cm and an opening 3 with a height of 10 cm over the entire length of the hood.
  • the beater drum 6a had a diameter of 40 cm and was rotated at a speed of 50-70 RPM. Air is drawn off at a rate of I00 m /min.
  • the evacuated dust was separated in a cyclone and a bag filter in succession. About 95 percent of the evacuated dust was recovered in the cyclone and the remaining 5 percent was recovered from the bag filter. The dust collected in the cyclone contained about 27 percent copper and about 2.5 percent tin while the dust collected in the bag filter contained 3 percent copper and 11 percent tin. The cyclone dust was supplied directly to a process for the recovery of copper while tin was recovered from the dust collected in the bag filter. Approximately 55 kg of dross containing 27 percent copper were collected per metric ton of lead.
  • the dross recovery using perforated scoops withdraws about 74 kg of material containing only 20 percent copper per metric ton of lead. Because the dross is collected at a lower rate and with a higher copper content according to the present invention, the costs of handling of processing the dross are substantially reduced.
  • the solid separation is carried out with low-labor cost and yields high-grade products. Losses of lead are kept low and the operation can be performed under hygienic conditions. A single-operation separation is another advantage.
  • a process for removing a layer of substantially fine-grain solid material formed by refining and consisting of copper dross upon a bath of molten lead comprising the steps of:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Cleaning In General (AREA)
  • Removal Of Floating Material (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Coating With Molten Metal (AREA)
US399511A 1972-09-29 1973-09-21 Method of removing solids (e.g. copper dross) from molten-lead baths Expired - Lifetime US3923499A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722247737 DE2247737C3 (de) 1972-09-29 Verfahren und Vorrichtung zur Abnahme von festem Kupfertraß von schmelzflüssigem Blei

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US3923499A true US3923499A (en) 1975-12-02

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US399511A Expired - Lifetime US3923499A (en) 1972-09-29 1973-09-21 Method of removing solids (e.g. copper dross) from molten-lead baths

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US (1) US3923499A (enrdf_load_stackoverflow)
JP (1) JPS5442324B2 (enrdf_load_stackoverflow)
AU (1) AU475319B2 (enrdf_load_stackoverflow)
BE (1) BE804285A (enrdf_load_stackoverflow)
CA (1) CA1011108A (enrdf_load_stackoverflow)
ES (1) ES418511A1 (enrdf_load_stackoverflow)
FR (1) FR2201346B1 (enrdf_load_stackoverflow)
GB (1) GB1443568A (enrdf_load_stackoverflow)
IT (1) IT993931B (enrdf_load_stackoverflow)
PL (1) PL87728B1 (enrdf_load_stackoverflow)
RO (1) RO64633A (enrdf_load_stackoverflow)
YU (1) YU36995B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160662A (en) * 1976-06-11 1979-07-10 Kubota, Ltd. Method for the removal of scum
US4191559A (en) * 1977-12-01 1980-03-04 Aluminum Company Of America Skim removal
EP0039035A1 (de) * 1980-04-26 1981-11-04 PREUSSAG - BOLIDEN - BLEI GmbH Vorrichtung zum Entfernen einer auf einem Bad befindlichen Fluidschicht
US4356033A (en) * 1980-06-10 1982-10-26 Davey Thomas R A Process for refining metals by drossing procedures
US20100187732A1 (en) * 2009-01-23 2010-07-29 Ricoh Company, Ltd. Solder recovery device
CN101994013A (zh) * 2010-12-10 2011-03-30 四会市鸿明贵金属有限公司 一种铜浮渣的冶炼方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19500266C1 (de) * 1995-01-07 1996-02-22 Metallgesellschaft Ag Verfahren und Vorrichtung zur Trennung einer spezifisch leichteren Phase von einer spezifisch schwereren flüssigen Phase
JP4747069B2 (ja) * 2006-10-13 2011-08-10 オリオン機械株式会社 洗浄槽の排水構造
CN107962145B (zh) * 2017-12-29 2023-10-03 南阳淅减汽车减振器有限公司 一种减振器铁屑自动吸附装置
CN112222098B (zh) * 2020-10-15 2021-08-06 衡阳佳鑫信息技术有限公司 一种机房用服务器保护与除尘装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632096A (en) * 1969-07-11 1972-01-04 Republic Steel Corp Apparatus and process for deslagging steel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5323689Y2 (enrdf_load_stackoverflow) * 1972-03-18 1978-06-19

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632096A (en) * 1969-07-11 1972-01-04 Republic Steel Corp Apparatus and process for deslagging steel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160662A (en) * 1976-06-11 1979-07-10 Kubota, Ltd. Method for the removal of scum
US4191559A (en) * 1977-12-01 1980-03-04 Aluminum Company Of America Skim removal
EP0039035A1 (de) * 1980-04-26 1981-11-04 PREUSSAG - BOLIDEN - BLEI GmbH Vorrichtung zum Entfernen einer auf einem Bad befindlichen Fluidschicht
US4415144A (en) * 1980-04-26 1983-11-15 Preussag-Boliden-Blei Gmbh Process and apparatus for removing a layer of fluid on top of a bath
US4356033A (en) * 1980-06-10 1982-10-26 Davey Thomas R A Process for refining metals by drossing procedures
US20100187732A1 (en) * 2009-01-23 2010-07-29 Ricoh Company, Ltd. Solder recovery device
US8119060B2 (en) * 2009-01-23 2012-02-21 Ricoh Company, Ltd. Solder recovery device
CN101994013A (zh) * 2010-12-10 2011-03-30 四会市鸿明贵金属有限公司 一种铜浮渣的冶炼方法
CN101994013B (zh) * 2010-12-10 2012-08-29 四会市鸿明贵金属有限公司 一种铜浮渣的冶炼方法

Also Published As

Publication number Publication date
JPS4972104A (enrdf_load_stackoverflow) 1974-07-12
DE2247737B2 (de) 1976-12-09
IT993931B (it) 1975-09-30
BE804285A (fr) 1974-02-28
DE2247737A1 (de) 1974-04-18
GB1443568A (en) 1976-07-21
JPS5442324B2 (enrdf_load_stackoverflow) 1979-12-13
ES418511A1 (es) 1976-06-16
PL87728B1 (enrdf_load_stackoverflow) 1976-07-31
YU234973A (en) 1982-06-18
RO64633A (fr) 1978-11-15
FR2201346B1 (enrdf_load_stackoverflow) 1976-05-14
AU5924073A (en) 1975-02-20
YU36995B (en) 1984-08-31
AU475319B2 (en) 1976-08-19
FR2201346A1 (enrdf_load_stackoverflow) 1974-04-26
CA1011108A (en) 1977-05-31

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