US1802242A - Production of oxy compounds of tantalum and columbium from the ores - Google Patents
Production of oxy compounds of tantalum and columbium from the ores Download PDFInfo
- Publication number
- US1802242A US1802242A US110473A US11047326A US1802242A US 1802242 A US1802242 A US 1802242A US 110473 A US110473 A US 110473A US 11047326 A US11047326 A US 11047326A US 1802242 A US1802242 A US 1802242A
- Authority
- US
- United States
- Prior art keywords
- tantalum
- ores
- columbium
- acid
- solution
- 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 - Lifetime
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- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 title description 33
- 239000010955 niobium Substances 0.000 title description 32
- 229910052715 tantalum Inorganic materials 0.000 title description 32
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title description 29
- 238000004519 manufacturing process Methods 0.000 title description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 44
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 37
- 239000000243 solution Substances 0.000 description 34
- 229960002050 hydrofluoric acid Drugs 0.000 description 23
- 238000002386 leaching Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- 235000006408 oxalic acid Nutrition 0.000 description 14
- 239000002253 acid Substances 0.000 description 13
- 150000001735 carboxylic acids Chemical class 0.000 description 13
- 150000001875 compounds Chemical class 0.000 description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000001117 sulphuric acid Substances 0.000 description 4
- 235000011149 sulphuric acid Nutrition 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 239000000908 ammonium hydroxide Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical class C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- -1 oxY Chemical class 0.000 description 2
- 235000011044 succinic acid Nutrition 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 208000025814 Inflammatory myopathy with abundant macrophages Diseases 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229940000425 combination drug Drugs 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 150000002913 oxalic acids Chemical class 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid group Chemical group C(CCC(=O)O)(=O)O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G33/00—Compounds of niobium
Definitions
- Our invention relates to methods of. recovering tantalum and' columbium from the ores, and more particularly to processes for the leaching of tantalum and columbium ores.
- tantalum and columbium are closely associated in nature and practically all tantalum and columbium ores con tain bothtantalum and columbium minerals.
- Various methodsof recovering these metals 7 10 from the ores have been proposed in the past.
- an acid capable of decomposing tantalum" or ..columbium ores such as hydrofluoric acid combined withan organiciacid in which tantalum and columbium will dissolve, such as: oxalic, tartaric, succinic or citric acids'forms a very effective leaching reagent fortantalum and I 730 columbium ores and particularly so when conducted at a temperature of "about the condensation point ofsteam.
- an acid capable of decomposing tantalum" or ..columbium ores such as hydrofluoric acid combined withan organiciacid in which tantalum and columbium will dissolve, such as: oxalic, tartaric, succinic or citric acids'forms a very effective leaching reagent fortantalum and I 730 columbium ores and particularly so when conducted at a temperature of "about the condensation point ofsteam.
- calcium fluoride and sulphuric acid in'the-presence of these organic acids may. be used and whilev "3 they act
- the leaching solution takes up not only tantalum and columbium but alsoinon,titanium, manganese and other impurities that may present. Tin in the form of $110 is, however, not attacked by the acids and: remains behindwith the gangue. The solution becomes quite thick and syrupy but upon precipitation with ammonium hydroxide (NH,OH)' or other alkali the tantalum and columbium are precipitated but the iron, titanium, manganese and other impurities remain in the solution and are not precipitated.
- NH,OH ammonium hydroxide
- oxalic acid furnishes more (If these" groups'with less additional weight to the molecule than any other carboxylic acid, while the group also will be directly attached to the molecule and not through a carbon chain.
- a leaching solution for tantalum and columbium ores comprising calcium fluoride anal1 sulphuric acid in the presence of oxalic 8% t i i v 3.
- a leaching solution for tantalum and columbium ores comprising a combinationof compounds adapted to generate hydrofluoric acid, and a carboxylic acid. 7
- a leaching solution for tantalum and columbium ores comprising an acid adapted to decompose said ores and a carboxylic acid.
- a process for the production of any compounds-of tantalum and columbiumfrom the ores which comprises the leaching of said ores with a solution containing hydrofluoric acid and a carboxylic acid while maintaining said solution at a temperature substantially equivalent to that of thecondensation temperature of steam;
- a process for the production of any compounds of tantalum and columbiumfrom the-ores which comprises the leaching of said ores with a solution containing-hydrofluoric acid and a carboxylic acid while simultaneously condensing. steam in the solution.
- a process for the production; of any compounds of tantalum andscolumbium from the ores which comprises the leaching of said oreswith a solution containing, com ounds adapted to generate hydrofluoric acid and a carboxylic acid while simultaneously condensing steam in the solution.
- a process for the production ofoxy compounds of tantalum and columbi llm comprising the leaching oftantalum and'columbium ores with a soliitioncontaining hydrofluoricacid and a carboxylic acid, followed by the precipitation out of the solution cfthe tantalum and columbium oxy compounds the addition of an alkali thereby effecting a separation from iron and other constituents of said ores; 5; 7
- a process for the production of oxy compounds of tantalum and columbium 001m prising the leaching of tantalum and columbium ores with a solution containin hydrofluoric acid and a carboxylic acid, ollowed by the precipitation out of the solution of the tantalum and .columbium oxy compounds by the addition of ammonium hydroxide.
- a leaching solution for tantalum and columbium ores consisting of oxalic acid dissolved to the saturation point in a 50% hydrofluoric acid solution.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
Patented Apr. 21, 1931 i I uureosrAres PATENT OFF C com o. FIN'K AND LESLIE G, ammnss' or NEW-3mm; imam, Assrenons ron'rriznav V METALCORPORATION, or new YORK, any, A conronarron or DELAWARE .PRoDUc'rroN or oxY comroulvns'or TANTALIiM AND coLUtInIU a IEROM- THE ORES No Drawing.
' Our invention relates to methods of. recovering tantalum and' columbium from the ores, and more particularly to processes for the leaching of tantalum and columbium ores.
- The two metals, tantalum and columbium are closely associated in nature and practically all tantalum and columbium ores con tain bothtantalum and columbium minerals. Various methodsof recovering these metals 7 10 from the ores have been proposed in the past.
Von'Bolton, for instance, fused the ore with soda ash or other alkali metal salts and leached the-fusion; By this method he obtained the compounds sodium tantalate and P115 sodiumcolumbate but the process is very.
complicatedand expensive. 1 We have found that both hydrofluoric and oxalic acids have leaching properties in respect of these ores but that, when used singly they are relatively very weak. Hydrofiuoric acid, however, has
much stronger leaching properties than oxalic acid.
'Wehave discovered, however, that an acid capable of decomposing tantalum" or ..columbium ores such as hydrofluoric acid combined withan organiciacid in which tantalum and columbium will dissolve, such as: oxalic, tartaric, succinic or citric acids'forms a very effective leaching reagent fortantalum and I 730 columbium ores and particularly so when conducted at a temperature of "about the condensation point ofsteam. Similarly calcium fluoride and sulphuric acid in'the-presence of these organic acidsmay. be used and whilev "3 they act more slowly than the hydrofluoric solution. The solution, therefore,.rremains more concentrated in free hydrofluoric acid centration of free hydrofluoric acid at any time; which is an important factor in the m extent ofthe'1each.-
is in equilibrium and moves to theright saturation point in a solution of hydro- Application filed May 20, 1926. Serial No."110,473.
In the case of the, calcium fluoride and sulphur c acid; combination the reaction the consumption of hydrofluoric acid in re, action and volatilization. ,But owing to the formationof oxalic acid compounds of the tantalum and columbium, there will be less of j the hydrofluoric acid consumed in the reaction and, consequently, hydrofluoric acid will be less rapidly generated by the action of the sulphuric-acid uponthe calcium fluoride. Theefl'ect of. this combination is, therefore,- slower than where hydrofluoric acid is directlyused. I V 2 We have found experimentally that a com bination of hydrofluoric acid with oxalic acid causes a much greater yield than the summation of the yields of both acids used singly. For example, from;l00 grams of the ore, leaching with these two acids singly and then in combination, the quantities of reagent used ineach .instance being. equivalent, we obtain the following results:
w 7V Grams Ox'alic acid alone f .16 Hydrofluoric acid alone; .30 Combination ofoxalic and hydrofluoric 32CldS i 111 applying our invention we use at the a beginning, for each 100parts of finely ground ore 100 parts of aleachingsolution containing for good f resultsoxalic acid dissolved to the 5 fluoric acid; Heating to about to 98 C.
- hastens the-action of the leach. ASexceptionallygood resultsmay be obtained by introducing steam directly into the solution and there condensing it, it is apparent thatthe above proportions will not hold good over a 'long-periodof steam condensation. It is also to be noted that-the quantity of hydrofluoric acid mentioned is equivalent to the hydrofluoric acid available fromlOO parts of cal- 95 a V 'cium fluoride. available to react upon the ore. :It 1s the con- Itis believed that the oxalic acid acts as a solution link for .thetantalum and columbium oxides 'andthat, its function is not that 'ofa mere"so1vent.; The compounds resulting from this leach a parently require free oxalic acid to hold t iem in solution, and as the concentration of free oxalic acid decreases, actual precipitation of the oxides from the solution occurs. An apparent break of the solution link takes place.
The leaching solution, of course, takes up not only tantalum and columbium but alsoinon,titanium, manganese and other impurities that may present. Tin in the form of $110 is, however, not attacked by the acids and: remains behindwith the gangue. The solution becomes quite thick and syrupy but upon precipitation with ammonium hydroxide (NH,OH)' or other alkali the tantalum and columbium are precipitated but the iron, titanium, manganese and other impurities remain in the solution and are not precipitated.
its above pointed out, the decomposing properties of the hydrofluoric acid make it a very im ortant factor inthe extent of the leach. here should, therefore, be as much oxalic acid present as the solution will hold in order that the valuable constituents of the are; in thiscase tlie'tantal'um and columbium, may be'takenup-insolution to the fullest entent. When the quantity of oxalic acid is substantially reduced, there is a very marked fiilfing'ofi in the ield. I
It is believed t at a large number of adsorl'aed carboxylic groups are necessary to Hold the tantalum and columbium oxides in,
solution and that oxalic acid furnishes more (If these" groups'with less additional weight to the molecule than any other carboxylic acid, while the group also will be directly attached to the molecule and not through a carbon chain. Succinic, tartaric and citric acids having a more complicated structure, all exhibit this property but to a less degree than oxalic acid. It may be' also that more ad sorbed groups may be necessary to holdjthe tantalum oxide in solution than in the case of the lighter columbium oxide.
It will beevid'ent, furthermore, that sevnnadl steps in the process which are hereinabove described as being simultaneous may hepursued separately. It is possible for instance to decomposev the ores by subjecting .themto the action of hydrofluoric acid as one step and then to dissolve the tantalum and eolumbiumout of the decomposed ore by oxalic acid'asa separate step.
"Having: thus described our invention what we claim. is:
1.. A leaching solution for tantalum and columbium orescomprising hydrofluoric acid andoxaliik: acid.
2. A leaching solution" for tantalum and columbium ores comprising calcium fluoride anal1 sulphuric acid in the presence of oxalic 8% t i i v 3. A leaching solution for tantalum and columbium ores comprising a combinationof compounds adapted to generate hydrofluoric acid, and a carboxylic acid. 7
4. A leaching solution for tantalum and columbium ores comprising an acid adapted to decompose said ores and a carboxylic acid.
5. The process of producing oxy'compounds of tantalum and columbium from the oreswhich comprises the leaching of said ores with a solution containing free hydrofluoric acid and free oxalic acid.
7. The process of producing 'oxy compounds of tantalum-and columbiumv frourthe ores which comprises subjecting said ores to the action ofhydrofluoric acid in the presence of a carboxylic acid.
7. The process v of producing oxy compounds of tantalum andcolumbium from the ores which comprises subjectin -said ores to the action of hydrofluoric aci in the pres ence of a carboxylic acid.
8. The process of producing oxy compounds of tantalum and columbium; from the ores which comprisessubjecting said ores to the action of calcium fluoride and sulphuric acid; in aqueous solution in the presence of a carboxylic acid.
9. The process of producing oxy compounds of tantalum and columbium from the ores which comprises decomposing said ores.
by means ofhydrofluoric acid and holding in solution the metal compoundsresulting from decomposition by means ofa carboxylic acid.
10. A process for the production of any compounds-of tantalum and columbiumfrom the ores which comprises the leaching of said ores with a solution containing hydrofluoric acid and a carboxylic acid while maintaining said solution at a temperature substantially equivalent to that of thecondensation temperature of steam;
11-. A process for the production of any compounds of tantalum and columbiumfrom the-ores which comprises the leaching of said ores with a solution containing-hydrofluoric acid and a carboxylic acid while simultaneously condensing. steam in the solution.
12. A process for the production; of any compounds of tantalum andscolumbium from the ores which comprises the leaching of said oreswith a solution containing, com ounds adapted to generate hydrofluoric acid and a carboxylic acid while simultaneously condensing steam in the solution.
13. A process for the production ofoxy compounds of tantalum and columbi llm comprising the leaching oftantalum and'columbium ores with a soliitioncontaining hydrofluoricacid and a carboxylic acid, followed by the precipitation out of the solution cfthe tantalum and columbium oxy compounds the addition of an alkali thereby effecting a separation from iron and other constituents of said ores; 5; 7
14. A process for the production of oxy compounds of tantalum and columbium 001m prising the leaching of tantalum and columbium ores with a solution containin hydrofluoric acid and a carboxylic acid, ollowed by the precipitation out of the solution of the tantalum and .columbium oxy compounds by the addition of ammonium hydroxide.
15. A process for the production of oxy i compounds of tantalum and columbium comfluoric acid and a carboxylic acid, while si-,
prising the leaching of tantalum and columbium ores with a solution containing hydromultaneously condensing steam in said solution, and subsequently precipitating the tantalum and columbium oxy compounds out of 7 the solution by the addition of ammonium hydroxide.
16. A leaching solution for tantalum and columbium ores consisting of oxalic acid dissolved to the saturation point in a 50% hydrofluoric acid solution. a
In Witness whereof, we have subscribed our names hereto this 15th day of May,
COLIN G. FINK. LESLIE G. JENNESS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US110473A US1802242A (en) | 1926-05-20 | 1926-05-20 | Production of oxy compounds of tantalum and columbium from the ores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US110473A US1802242A (en) | 1926-05-20 | 1926-05-20 | Production of oxy compounds of tantalum and columbium from the ores |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1802242A true US1802242A (en) | 1931-04-21 |
Family
ID=22333193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US110473A Expired - Lifetime US1802242A (en) | 1926-05-20 | 1926-05-20 | Production of oxy compounds of tantalum and columbium from the ores |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1802242A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2819146A (en) * | 1955-02-15 | 1958-01-07 | Mallinckrodt Chemical Works | Method of separating values of columbium and/or tantalum from a concentrate also containing an element of group iv b |
| US2819945A (en) * | 1955-02-15 | 1958-01-14 | Mallinckrodt Chemical Works | Method of separating values of columbium and/or tantalum from a concentrate also containing an element of group iv b |
| US2859099A (en) * | 1955-02-15 | 1958-11-04 | Mallinckrodt Chemical Works | Process for the separation of columbium and tantalum values |
| US2859098A (en) * | 1955-02-15 | 1958-11-04 | Mallinckrodt Chemical Works | Process for the separation of columbium, tantalum, and titanium values |
| US2943912A (en) * | 1957-12-02 | 1960-07-05 | Quaker Oats Co | Process of separating tantalum from niobium |
| US3051547A (en) * | 1962-08-28 | Production of potassium fxuotantajlate | ||
| US3131039A (en) * | 1961-10-12 | 1964-04-28 | Frederick C Nonamaker | Process for preparing a polishing compound |
| US4490340A (en) * | 1984-02-29 | 1984-12-25 | Gte Products Corporation | Process for the recovery of high purity tantalum oxide |
| US4495158A (en) * | 1984-02-29 | 1985-01-22 | Gte Products Corporation | Process for the recovery of tantalum values |
| US4537750A (en) * | 1984-02-29 | 1985-08-27 | Gte Products Corporation | Process for producing high purity tantalum oxide |
| US6338832B1 (en) | 1995-10-12 | 2002-01-15 | Cabot Corporation | Process for producing niobium and tantalum compounds |
| US6383459B1 (en) * | 2000-08-31 | 2002-05-07 | Osram Sylvania Inc. | Method for purifying a tantalum compound using a fluoride compound and sulfuric acid |
| US20030165416A1 (en) * | 2002-03-04 | 2003-09-04 | Hard Robert A. | Methods to control H2S and arsine emissions |
-
1926
- 1926-05-20 US US110473A patent/US1802242A/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3051547A (en) * | 1962-08-28 | Production of potassium fxuotantajlate | ||
| US2819146A (en) * | 1955-02-15 | 1958-01-07 | Mallinckrodt Chemical Works | Method of separating values of columbium and/or tantalum from a concentrate also containing an element of group iv b |
| US2819945A (en) * | 1955-02-15 | 1958-01-14 | Mallinckrodt Chemical Works | Method of separating values of columbium and/or tantalum from a concentrate also containing an element of group iv b |
| US2859099A (en) * | 1955-02-15 | 1958-11-04 | Mallinckrodt Chemical Works | Process for the separation of columbium and tantalum values |
| US2859098A (en) * | 1955-02-15 | 1958-11-04 | Mallinckrodt Chemical Works | Process for the separation of columbium, tantalum, and titanium values |
| US2943912A (en) * | 1957-12-02 | 1960-07-05 | Quaker Oats Co | Process of separating tantalum from niobium |
| US3131039A (en) * | 1961-10-12 | 1964-04-28 | Frederick C Nonamaker | Process for preparing a polishing compound |
| US4495158A (en) * | 1984-02-29 | 1985-01-22 | Gte Products Corporation | Process for the recovery of tantalum values |
| US4490340A (en) * | 1984-02-29 | 1984-12-25 | Gte Products Corporation | Process for the recovery of high purity tantalum oxide |
| US4537750A (en) * | 1984-02-29 | 1985-08-27 | Gte Products Corporation | Process for producing high purity tantalum oxide |
| US6338832B1 (en) | 1995-10-12 | 2002-01-15 | Cabot Corporation | Process for producing niobium and tantalum compounds |
| US20050232850A1 (en) * | 1995-10-12 | 2005-10-20 | Brown Patrick M | Process for producing niobium and tantalum compounds |
| US6984370B2 (en) | 1995-10-12 | 2006-01-10 | Cabot Corporation | Process for producing niobium and tantalum compounds |
| US7276225B2 (en) | 1995-10-12 | 2007-10-02 | Cabot Corporation | Process for producing niobium and tantalum compounds |
| US6383459B1 (en) * | 2000-08-31 | 2002-05-07 | Osram Sylvania Inc. | Method for purifying a tantalum compound using a fluoride compound and sulfuric acid |
| AU780618B2 (en) * | 2000-08-31 | 2005-04-07 | Global Tungsten and Powders Corporation | Tantalum purification method |
| US20030165416A1 (en) * | 2002-03-04 | 2003-09-04 | Hard Robert A. | Methods to control H2S and arsine emissions |
| US6800259B2 (en) | 2002-03-04 | 2004-10-05 | Cabot Corporation | Methods to control H2S and arsine emissions |
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