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Publication numberUS2183517 A
Publication typeGrant
Publication dateDec 12, 1939
Filing dateJan 27, 1938
Priority dateMar 19, 1937
Publication numberUS 2183517 A, US 2183517A, US-A-2183517, US2183517 A, US2183517A
InventorsPierre Leemans Joseph
Original AssigneeMetallurg De Hoboken Soc Gen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Treatment of materials containing tantalum and niobium
US 2183517 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

85 such 'as Ni, Co, Fe.

Patented it 12, rate TREATMENT on ivm'raaiaas coNTama TANTALUM area 1 Joseph Pierre Leemans, Hoboken, near Antwerp, Belgium, assignmto Socit Gnrale Metal lurgique dc Hobokem-Hoboken, near Antwr Belgium, a limited company of lgi No Dra. Application January 27,19

. rial No. 187,25. n

aciaims.

This invention relates to an improved process for the recovery of tantalum and/or niobium from their ores, or from metallurgical by-products such as those in which the said elements 5 may be found in the form of oxide compounds free or combined.

This invention has for its object the recovery by an economical process of tantalum and/or niobium in the form of metals or of alloys.

According to the invention, the primary material is subjected to a selective reduction in the presence of one or several of the following reducing elements: Ca, Al, Si, Mg, alloyed or combined with one or more metals as character- 16 ized below, so as to obtain a product (alloy for instance) in which the ratio NbzTa is higher than that of the primary material.

The metals which are added to the reducing agents are such metals whose alloying or com- 20 bination reaction with the aforesaid reducing agents develops heat so that the metallo-thermic power of a given quantity of these reducing elements is smaller in the obtained alloy or combination than in the same quantity in the elemen- 25 tary state. Among these metals, nickel, cobalt,

' iron, are more particularly contemplated.

For carrying this feature of the invention into efiect, the primary material containing tantalum and niobium may be subjected inside a suitable an metallurgical apparatus, such as arr-electric furnace, to a selective reduction in the presence of one or more oi the elements Si, Ca, Al, Mg, the thermic capacity of which has been diminished by alloying or combining them to other metals The amount of reducing agent may be so calculated that the major part of the Nb contained in the primary material'is reduced and passes into an alloy in which the ratio Nb:Ta is higher than that of the primary 0 material. The other component elements of the Great Brit 5.:

alloy are the metal or metals used for lowering the thermic capacity of the reducing agent.

By the process according to the pretent invention, an alloy is obtained in which the ratio Nb'z'Ia is higher than that of the primary material, and also a slag is obtained in which the ratio NbzTa is higher than that of the primary material. Theslag may be treated by any suitable known process with a view to recovering the tantalum and niobium.

I claim:

1. A process for the treatment of primary materials containing tantalum and niobium, com prising a reduction of the primary material by means-of at least one of the metals Al, Ca, Mg alloyed with at least one of metals whose alloying reaction with the aforesaid reducing elements develops heat so that the metallic-thermic power of a given quantity of the said reducing elements is smaller in the obtained alloy than in the same quantity in the elementary state, thereby selectively reducing the niobium relatively to thetantalum and obtaining an alloy in which the ratio v niobium:tantalum is higher than in the primary material, and a slag in which the ratio tantai

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2516863 *Jul 15, 1946Aug 1, 1950Daniel GardnerProcess of producing tantalum, columbium, and compounds thereof
US2905548 *Sep 6, 1957Sep 22, 1959Fansteel Metallurgical CorpMethod of recovering tantalum and columbium
US2905549 *Oct 14, 1957Sep 22, 1959Fansteel Metallurgical CorpMethod of recovering refractory metals
US2905550 *Oct 14, 1957Sep 22, 1959Fansteel Metallurgical CorpRecovery of refractory metals
US2992095 *Jan 17, 1958Jul 11, 1961Wah Chang CorpProcess of separating niobium and tantalum values in oxidic ores and of producing pure niobium
US3132024 *Oct 10, 1960May 5, 1964Union Carbide CorpUpgrading of oxidic columbiumtantalum materials
US6322912Sep 15, 1999Nov 27, 2001Cabot CorporationElectrolytic capacitor anode of valve metal oxide
US6373685Mar 23, 2000Apr 16, 2002Cabot CorporationCapacitor anode comprising a niobium oxide having an atomic ratio of niobium to oxygen of 1 to >2.5 and being formed at a formation voltage of about 6 volts or higher.
US6391275Sep 16, 1998May 21, 2002Cabot CorporationHeat treatment in the presence of an oxygen scavenger; capacitor anodes with reduced direct current leakage and increased capacitance
US6416730Jul 6, 1999Jul 9, 2002Cabot CorporationReducing niobium pentoxide in the presence of hydrogen and homogenizing; for use in anodes
US6462934Jan 11, 2001Oct 8, 2002Cabot CorporationHeat treating niobium oxide in the presence of a getter to transfer oxygen atoms from the niobium oxide to the getter material; capacitor anode comprising a niobium oxide having an atomic ratio of niobium to oxygen of 1: less than 2.5
US6527937Feb 19, 2002Mar 4, 2003Cabot CorporationHeat treatment/sintering; getter/scavenger material permits transfer of oxygen atoms; capacitors; anodes
US6576099Mar 23, 2001Jun 10, 2003Cabot CorporationOxygen reduced niobium oxides
US6592740May 17, 2002Jul 15, 2003Cabot CorporationHeat treating niobium oxide in presence of niobium flaked getter material and in an atmosphere which permits transfer of oxygen atoms from the niobium oxide to the niobium flaked getter material to from oxygen reduced niobium oxide
US6639787Nov 6, 2001Oct 28, 2003Cabot CorporationCoating an oxygen reduced niobium oxide (NbO) powder with a binder or lubricant or both, pressing the coated mixture to form an anode
US6759026Feb 1, 2002Jul 6, 2004Cabot CorporationMethods to partially reduce a niobium metal oxide and oxygen reduced niobium oxides
US7220397Sep 2, 2003May 22, 2007Cabot CorporationOvercoating niobium oxide with binder, lubricant
US7241436Sep 6, 2001Jul 10, 2007Cabot CorporationMethods to partially reduce certain metal oxides and oxygen reduced metal oxides
US7445679May 16, 2003Nov 4, 2008Cabot CorporationControlled oxygen addition for metal material
US7445762May 12, 2003Nov 4, 2008Cabot CorporationMethod to partially reduce calcined niobium metal oxide and oxygen reduced niobium oxides
US7515397May 19, 2004Apr 7, 2009Cabot CorporationMethods of making a niobium metal oxide and oxygen reduced niobium oxides
US7655214Feb 25, 2004Feb 2, 2010Cabot CorporationPowder; reduced oxygen concentration; using scavenger for transferring of oxygen
US8110172Apr 7, 2009Feb 7, 2012Cabot CorporationMethods of making a niobium metal oxide and oxygen reduced niobium oxides
Classifications
U.S. Classification75/622, 420/425
International ClassificationC22B34/24, C22B34/00
Cooperative ClassificationC22B34/24
European ClassificationC22B34/24