CA2448027C - Process for selectively removing molybdenum from liquid mixtures containing it together with vanadium - Google Patents
Process for selectively removing molybdenum from liquid mixtures containing it together with vanadium Download PDFInfo
- Publication number
- CA2448027C CA2448027C CA002448027A CA2448027A CA2448027C CA 2448027 C CA2448027 C CA 2448027C CA 002448027 A CA002448027 A CA 002448027A CA 2448027 A CA2448027 A CA 2448027A CA 2448027 C CA2448027 C CA 2448027C
- Authority
- CA
- Canada
- Prior art keywords
- molybdenum
- alkaline
- mixture
- vanadium
- 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
Links
- 229910052750 molybdenum Inorganic materials 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 title claims abstract description 16
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000011733 molybdenum Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 title claims abstract description 10
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 4
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000012991 xanthate Substances 0.000 claims abstract description 12
- 238000001556 precipitation Methods 0.000 claims abstract description 7
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 235000016768 molybdenum Nutrition 0.000 claims description 11
- JCBJVAJGLKENNC-UHFFFAOYSA-M potassium ethyl xanthate Chemical group [K+].CCOC([S-])=S JCBJVAJGLKENNC-UHFFFAOYSA-M 0.000 claims description 3
- 238000007792 addition Methods 0.000 claims 1
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000003960 organic solvent Substances 0.000 description 5
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000005456 alcohol based solvent Substances 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000005078 molybdenum compound Substances 0.000 description 1
- 150000002752 molybdenum compounds Chemical class 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003495 polar organic solvent Substances 0.000 description 1
- CRAXZMAICBMTCW-UHFFFAOYSA-M potassium;2-methylpropoxymethanedithioate Chemical compound [K+].CC(C)COC([S-])=S CRAXZMAICBMTCW-UHFFFAOYSA-M 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- PTISTKLWEJDJID-UHFFFAOYSA-N sulfanylidenemolybdenum Chemical class [Mo]=S PTISTKLWEJDJID-UHFFFAOYSA-N 0.000 description 1
- HIZCIEIDIFGZSS-UHFFFAOYSA-L trithiocarbonate Chemical compound [S-]C([S-])=S HIZCIEIDIFGZSS-UHFFFAOYSA-L 0.000 description 1
- 239000012989 trithiocarbonate Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- 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
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/34—Obtaining molybdenum
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G39/00—Compounds of molybdenum
- C01G39/003—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G39/00—Compounds of molybdenum
- C01G39/06—Sulfides
-
- 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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
- C22B3/34—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing sulfur, e.g. sulfonium
-
- 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
- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/22—Obtaining vanadium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S210/00—Liquid purification or separation
- Y10S210/902—Materials removed
- Y10S210/911—Cumulative poison
- Y10S210/912—Heavy metal
Abstract
Process for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than (200) mg/l, together with vanadium characterized in that it comprises the following steps: bringing the liquid mixture to a pH of less than (3); adding a solution of an alkaline xanthate to the solution so that the molar ratio molybdenum/alkaline xanthate ranges from (1/4) to (1/8), maintaining the pH constant by means of the addition of an inorganic acid; stirring the mixture causing the precipitation of the molybdenum present in the mixture.
Description
PROCESS FOR SELECTIVELY REMOVING MOLYBDENUM FROM LIQUID
MIXTURES CONTAINING IT TOGETHER WITH VANADIUM.
The present invention relates to a process for se-lectively removing molybdenum from liquid mixtures con-taming it, together with vanadium.
The separation between molybdenum and vanadium from inorganic solutions containing them is generally not very easy. Among the most widely-known and applica-ble technologies currently used, the precipitation of molybdenum sulfide with alkaline sulfides or sulfuric acid, which leaves the vanadium in solution, or extrac-tion and separation with organic solvents, can be men-tinned.
In the former case, the process is relatively sim-ple, leading to the formation of an inorganic compound insoluble in organic solvents and which cannot there-fore be directly re-used in certain applications, in the latter case, the process is definitely more complex with the formation of an organic solution containing molybdenum.
We have found that by using alkaline xanthates in certain concentrations, it is possible to obtain good separation yields using a simple process which leads to the formation of molybdenum compounds having a solubil-ity in organic solvents which allows them to be di-rectly re-used in certain applications.
Xanthates of alkaline metals have been known for some time and are mostly applied, apart from the impor-tance of cellulose xanthate for the production of rayon, as flotation collectors of metallic sulfides, in particular copper and molybdenum sulfides.
They are also used in the vulcanization of rubber, as herbicides and pesticides, additives for lubricants, etc.
Free acids are of the ROCS2H type, colourless, un-stable and soluble in common organic solvents they de-compose at room temperature into carbon disulfide and into the corresponding alcohol according to the follow-ing scheme:
MIXTURES CONTAINING IT TOGETHER WITH VANADIUM.
The present invention relates to a process for se-lectively removing molybdenum from liquid mixtures con-taming it, together with vanadium.
The separation between molybdenum and vanadium from inorganic solutions containing them is generally not very easy. Among the most widely-known and applica-ble technologies currently used, the precipitation of molybdenum sulfide with alkaline sulfides or sulfuric acid, which leaves the vanadium in solution, or extrac-tion and separation with organic solvents, can be men-tinned.
In the former case, the process is relatively sim-ple, leading to the formation of an inorganic compound insoluble in organic solvents and which cannot there-fore be directly re-used in certain applications, in the latter case, the process is definitely more complex with the formation of an organic solution containing molybdenum.
We have found that by using alkaline xanthates in certain concentrations, it is possible to obtain good separation yields using a simple process which leads to the formation of molybdenum compounds having a solubil-ity in organic solvents which allows them to be di-rectly re-used in certain applications.
Xanthates of alkaline metals have been known for some time and are mostly applied, apart from the impor-tance of cellulose xanthate for the production of rayon, as flotation collectors of metallic sulfides, in particular copper and molybdenum sulfides.
They are also used in the vulcanization of rubber, as herbicides and pesticides, additives for lubricants, etc.
Free acids are of the ROCS2H type, colourless, un-stable and soluble in common organic solvents they de-compose at room temperature into carbon disulfide and into the corresponding alcohol according to the follow-ing scheme:
ROCS2- + H+ - ROCS~H = ROH + CS2 The corresponding alkaline salts, on the other hand, are relatively stable solids, soluble in water, alcohol and polar organic solvents. In aqueous solution and at room temperature, potassium ethyl xanthate, for example, hydrolyzes as follows:
6C2H50CS2K + 3H~0 = 6C2H50H + 2KSCS2K + K2C03 + 3CS2 by further hydrolysis of the carbon disulfide and tri-thiocarbonate, hydrogen sulfide is formed.
The salts of heavy metals are more soluble in or-panic solvents, chloroform, THF and benzene wn.ereas they are not very soluble in water, alcohol and ali-phatic hydrocarbons. A sufficient number of C atoms makes them more soluble in organic solvents.
The process, object of the present invention, for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than 200 mg/l, to-gether with vanadium, is characterized in that it com-prises the following steps:
~ bringing the liquid mixture to a pH of less than 3, preferably equal to or less than 2;
~ adding a solution of an alkaline xanthate to the solution so that the molar ratio molybde-num/alkaline xanthate ranges from 1/4 to 1/8, preferably from 1/5 to 1/7, maintaining the pH
constant by means of the addition of an inorganic acid:
stirring the mixture causing the precipitation of the molybdenum present in the mixture.
The alkaline xanthates recommended for the process according to the invention are alkaline ethylxanthates, in particular potassium ethylxanthate.
Some examples are provided for a better under-standing of the present invention but should not be considered as limiting the scope of the invention it-self.
r-,t>rw~rr n , Hydrochloric acid diluted to a pH = 2 is added to an alkaline solution containing Mo and V (10 and 5 g/1 respectively), followed by the slow addition of potas-slum ethyl xanthate in solution at 300 g/1 and at room temperature, the pH=2 being maintained constant with the same acid solution.
Most of the Mo almost completely precipitates, un-like V which decreases to a much lesser extent.
The precipitation yield is about 82d for Mo and 80 for V, respectively.
~,.r-.,~rr n This test is carried out analogously to the previ-ous one but at pH-1 by sulfuric acid. In this case, the precipitation yield of the Mo is significantly im-proved, with a good separation from the vanadium, 950 and 6o respectively. The molar ratio Mo:K ethylxanthate is equal to 1:6.
From chemical analysis of the washed precipitate, it can be seen that the Mo and V content is as follows:
Element weight V 0.23 Mo 32.4 As can be seen, the initial Mo/V ratio, which was 2:1, becomes 140:1.
Diluted sulfuric acid is slowly added to an alka-line solution containing Mo at 5 g/lt and V 3 g/lt to pH-1, followed by a solution of potassium isobutylxan-thate at about 300 g/lt, the pH being maintained con-stant at 1. The precipitation yield of Mo in this case proved to be 93o and 7o for V.
6C2H50CS2K + 3H~0 = 6C2H50H + 2KSCS2K + K2C03 + 3CS2 by further hydrolysis of the carbon disulfide and tri-thiocarbonate, hydrogen sulfide is formed.
The salts of heavy metals are more soluble in or-panic solvents, chloroform, THF and benzene wn.ereas they are not very soluble in water, alcohol and ali-phatic hydrocarbons. A sufficient number of C atoms makes them more soluble in organic solvents.
The process, object of the present invention, for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than 200 mg/l, to-gether with vanadium, is characterized in that it com-prises the following steps:
~ bringing the liquid mixture to a pH of less than 3, preferably equal to or less than 2;
~ adding a solution of an alkaline xanthate to the solution so that the molar ratio molybde-num/alkaline xanthate ranges from 1/4 to 1/8, preferably from 1/5 to 1/7, maintaining the pH
constant by means of the addition of an inorganic acid:
stirring the mixture causing the precipitation of the molybdenum present in the mixture.
The alkaline xanthates recommended for the process according to the invention are alkaline ethylxanthates, in particular potassium ethylxanthate.
Some examples are provided for a better under-standing of the present invention but should not be considered as limiting the scope of the invention it-self.
r-,t>rw~rr n , Hydrochloric acid diluted to a pH = 2 is added to an alkaline solution containing Mo and V (10 and 5 g/1 respectively), followed by the slow addition of potas-slum ethyl xanthate in solution at 300 g/1 and at room temperature, the pH=2 being maintained constant with the same acid solution.
Most of the Mo almost completely precipitates, un-like V which decreases to a much lesser extent.
The precipitation yield is about 82d for Mo and 80 for V, respectively.
~,.r-.,~rr n This test is carried out analogously to the previ-ous one but at pH-1 by sulfuric acid. In this case, the precipitation yield of the Mo is significantly im-proved, with a good separation from the vanadium, 950 and 6o respectively. The molar ratio Mo:K ethylxanthate is equal to 1:6.
From chemical analysis of the washed precipitate, it can be seen that the Mo and V content is as follows:
Element weight V 0.23 Mo 32.4 As can be seen, the initial Mo/V ratio, which was 2:1, becomes 140:1.
Diluted sulfuric acid is slowly added to an alka-line solution containing Mo at 5 g/lt and V 3 g/lt to pH-1, followed by a solution of potassium isobutylxan-thate at about 300 g/lt, the pH being maintained con-stant at 1. The precipitation yield of Mo in this case proved to be 93o and 7o for V.
Claims (5)
1) A process for selectively removing molybdenum from liquid mixtures containing it, in a quantity greater than 200 mg/l, together with vanadium characterized in that it comprises the following steps:
~ bringing the liquid mixture to a pH of less than 3;
~ adding a solution of an alkaline xanthate to the solution so that the molar ratio molybde-num/alkaline xanthate ranges from 1/4 to 1/8, maintaining the pH constant by means of the addi-tion of an inorganic acid;
~ stirring the mixture causing the precipitation of the molybdenum present in the mixture.
~ bringing the liquid mixture to a pH of less than 3;
~ adding a solution of an alkaline xanthate to the solution so that the molar ratio molybde-num/alkaline xanthate ranges from 1/4 to 1/8, maintaining the pH constant by means of the addi-tion of an inorganic acid;
~ stirring the mixture causing the precipitation of the molybdenum present in the mixture.
2) The process according to claim 1, wherein the liq-uid mixture is brought to a pH equal to or lower than 2.
3) The process according to claim 1, wherein the mo-lar ratio molybdenum/alkaline xanthate ranges from 1/5 to 1/7.
4) The process according to any of the claims from 1 to 3 wherein the alkaline xanthate is an alkaline ethylxanthate.
5) The process according to claim 4, wherein the al-kaline ethylxanthate is potassium ethylxanthate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI01A001111 | 2001-05-25 | ||
| IT2001MI001111A ITMI20011111A1 (en) | 2001-05-25 | 2001-05-25 | PROCEDURE FOR SELECTIVELY REMOVING THE MOBILDENO FROM LIQUID MIXTURES THAT CONTAIN IT WITH THE VANADIUM |
| PCT/EP2002/005313 WO2002097144A2 (en) | 2001-05-25 | 2002-05-14 | Process for selectively removing molybdenum from solutions containing molydenum and vanadium using a xanthate complexant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2448027A1 CA2448027A1 (en) | 2002-12-05 |
| CA2448027C true CA2448027C (en) | 2009-09-22 |
Family
ID=11447758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002448027A Expired - Lifetime CA2448027C (en) | 2001-05-25 | 2002-05-14 | Process for selectively removing molybdenum from liquid mixtures containing it together with vanadium |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US7255795B2 (en) |
| JP (1) | JP3944162B2 (en) |
| CN (1) | CN1246488C (en) |
| AU (1) | AU2002313469A1 (en) |
| BR (1) | BR0209935A (en) |
| CA (1) | CA2448027C (en) |
| DE (1) | DE10296846B4 (en) |
| GB (1) | GB2402126B (en) |
| IT (1) | ITMI20011111A1 (en) |
| MX (1) | MXPA03010603A (en) |
| RU (1) | RU2287599C2 (en) |
| WO (1) | WO2002097144A2 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060058174A1 (en) * | 2004-09-10 | 2006-03-16 | Chevron U.S.A. Inc. | Highly active slurry catalyst composition |
| US7485267B2 (en) * | 2005-07-29 | 2009-02-03 | Chevron U.S.A. Inc. | Process for metals recovery from spent catalyst |
| CA2703137C (en) * | 2007-10-31 | 2016-05-24 | Chevron U.S.A. Inc. | Hydroprocessing bulk catalyst and uses thereof |
| US7837960B2 (en) * | 2007-11-28 | 2010-11-23 | Chevron U.S.A. Inc. | Process for separating and recovering base metals from used hydroprocessing catalyst |
| US7846404B2 (en) * | 2007-11-28 | 2010-12-07 | Chevron U.S.A. Inc. | Process for separating and recovering base metals from used hydroprocessing catalyst |
| US8389433B2 (en) * | 2009-11-24 | 2013-03-05 | Chevron U.S.A. | Hydroprocessing bulk catalyst and methods of making thereof |
| US8372776B2 (en) * | 2009-11-24 | 2013-02-12 | Chevron U.S.A. Inc. | Hydroprocessing bulk catalyst and methods of making thereof |
| CN101857915A (en) * | 2010-06-03 | 2010-10-13 | 浙江大学 | Pelletizing and calcination method for vanadium-containing stone coal ash |
| US8815184B2 (en) | 2010-08-16 | 2014-08-26 | Chevron U.S.A. Inc. | Process for separating and recovering metals |
| IT1404142B1 (en) * | 2010-11-26 | 2013-11-15 | Eni Spa | PROCEDURE FOR THE SELECTIVE REMOVAL OF THE MOLYBDENUM FROM A SOLUTION THAT CONTAINS IT |
| RU2477329C1 (en) * | 2012-01-13 | 2013-03-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет тонких химических технологий имени М.В. Ломоносова" (МИТХТ) | Extraction method of molybdenum from diluted acid solutions of complex composition |
| US9687823B2 (en) | 2012-12-14 | 2017-06-27 | Chevron U.S.A. Inc. | Hydroprocessing co-catalyst compositions and methods of introduction thereof into hydroprocessing units |
| US9321037B2 (en) | 2012-12-14 | 2016-04-26 | Chevron U.S.A., Inc. | Hydroprocessing co-catalyst compositions and methods of introduction thereof into hydroprocessing units |
| TW202117027A (en) | 2019-07-08 | 2021-05-01 | 美商雪維隆美國有限公司 | Metals recovery from spent catalyst |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE258573C (en) | ||||
| SU273932A1 (en) * | 1969-05-27 | 1977-08-25 | Московский Ордена Трудового Красного Знамени Институт Стали И Сплавов | Method for extraction separation of tungsten and molybdenum |
| US3607008A (en) * | 1969-06-30 | 1971-09-21 | Sylvania Electric Prod | Separation of molybdenum values from tungsten values by solvent extraction |
| US3653815A (en) * | 1969-09-03 | 1972-04-04 | Kennicott Copper Corp | Recovery of molybdenum |
| US3912623A (en) * | 1973-08-17 | 1975-10-14 | Anaconda Co | Flotation recovery of molybdenum |
| US4051316A (en) * | 1974-10-16 | 1977-09-27 | The United States Of America As Represented By The Secretary Of Agriculture | Removal of heavy metal ions from aqueous solutions with insoluble crosslinked-starch-xanthates |
| US4605518A (en) * | 1981-06-04 | 1986-08-12 | Crozier Ronald D G | Industrial process for the manufacture of alkyl xanthogen formates |
| US4410439A (en) * | 1981-06-04 | 1983-10-18 | Crozier Ronald D G | Collector compositions for froth flotation and process for making same |
| US4444733A (en) * | 1983-02-28 | 1984-04-24 | Amax Inc. | Process for recovering molybdenum and copper from sulfide concentrates |
| DD258573A1 (en) * | 1985-11-07 | 1988-07-27 | Akad Wissenschaften Ddr | PROCESS FOR OBTAINING MOLYBDAENITE CONCENTRATE |
| US5320759A (en) * | 1992-06-11 | 1994-06-14 | Hazen Research, Inc. | Selective recovery of heavy metals using xanthates |
| US5505857A (en) * | 1994-01-13 | 1996-04-09 | Buckman Laboratories International, Inc. | Process for the treatment of metal-containing water and recovery of metals therefrom |
| US5536416A (en) * | 1994-10-31 | 1996-07-16 | Hazen Research, Inc. | Method for removing metals from a solution |
-
2001
- 2001-05-25 IT IT2001MI001111A patent/ITMI20011111A1/en unknown
-
2002
- 2002-05-14 RU RU2003133975/02A patent/RU2287599C2/en active
- 2002-05-14 AU AU2002313469A patent/AU2002313469A1/en not_active Abandoned
- 2002-05-14 BR BR0209935-7A patent/BR0209935A/en not_active Application Discontinuation
- 2002-05-14 WO PCT/EP2002/005313 patent/WO2002097144A2/en active Application Filing
- 2002-05-14 US US10/478,501 patent/US7255795B2/en not_active Expired - Lifetime
- 2002-05-14 GB GB0327253A patent/GB2402126B/en not_active Expired - Fee Related
- 2002-05-14 JP JP2003500306A patent/JP3944162B2/en not_active Expired - Fee Related
- 2002-05-14 CN CNB028106741A patent/CN1246488C/en not_active Expired - Lifetime
- 2002-05-14 DE DE10296846T patent/DE10296846B4/en not_active Expired - Fee Related
- 2002-05-14 MX MXPA03010603A patent/MXPA03010603A/en active IP Right Grant
- 2002-05-14 CA CA002448027A patent/CA2448027C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US7255795B2 (en) | 2007-08-14 |
| GB0327253D0 (en) | 2003-12-24 |
| DE10296846T5 (en) | 2004-04-29 |
| CN1246488C (en) | 2006-03-22 |
| GB2402126A (en) | 2004-12-01 |
| US20040262232A1 (en) | 2004-12-30 |
| GB2402126B (en) | 2005-06-08 |
| RU2287599C2 (en) | 2006-11-20 |
| WO2002097144A3 (en) | 2003-05-01 |
| CA2448027A1 (en) | 2002-12-05 |
| WO2002097144A2 (en) | 2002-12-05 |
| CN1511195A (en) | 2004-07-07 |
| AU2002313469A1 (en) | 2002-12-09 |
| ITMI20011111A0 (en) | 2001-05-25 |
| JP3944162B2 (en) | 2007-07-11 |
| BR0209935A (en) | 2004-04-06 |
| MXPA03010603A (en) | 2004-12-06 |
| ITMI20011111A1 (en) | 2002-11-25 |
| DE10296846B4 (en) | 2011-02-24 |
| JP2004526870A (en) | 2004-09-02 |
| RU2003133975A (en) | 2005-05-10 |
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| MKEX | Expiry |
Effective date: 20220516 |