SE2050961A1 - Method for recycling metals from carbon-containing waste molybdenum catalysts - Google Patents

Method for recycling metals from carbon-containing waste molybdenum catalysts

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Publication number
SE2050961A1
SE2050961A1 SE2050961A SE2050961A SE2050961A1 SE 2050961 A1 SE2050961 A1 SE 2050961A1 SE 2050961 A SE2050961 A SE 2050961A SE 2050961 A SE2050961 A SE 2050961A SE 2050961 A1 SE2050961 A1 SE 2050961A1
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Sweden
Prior art keywords
carbon
catalysts
containing waste
molybdenum
ranging
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SE2050961A
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SE544907C2 (en
Inventor
Ming-Zhe Tsai
Yu Lung Sun
Yung-Hao Liu
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Hong Jing Metal Corp
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Priority to SE2050961A priority Critical patent/SE544907C2/en
Publication of SE2050961A1 publication Critical patent/SE2050961A1/en
Publication of SE544907C2 publication Critical patent/SE544907C2/en

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    • 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
    • C22B34/225—Obtaining vanadium from spent catalysts
    • 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
    • C22B34/345—Obtaining molybdenum from spent catalysts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/009—General processes for recovering metals or metallic compounds from spent catalysts
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

OF THE DISCLOSUREA method for recycling metals from carbon-containing waste molybdenum catalysts is used to solve the problem of the conventional method for recovering metals from the waste molybdenum catalysts being not suitable for the carbon-containing waste molybdenum catalysts. The method for recovering from carbon-containing waste molybdenum catalysts includes providing the carbon-containing waste molybdenum catalysts including molybdenum (Mo), vanadium (V), nickel (Ni), carbon (C) and sulfide (S). The carbon-containing waste molybdenum catalysts are mixed with an alkaline solution in a volume ratio ranging from 1:1 to 1:4, followed by an alkali leaching reaction at a temperature ranging from 100°C to 400°C and a pressure ranging from 3 kg/cm2 to 15 kg/cm2 for a time period ranging from 1 hour to 5 hours, obtaining a alkali leaching solution. The alkali leaching solution is filtered to obtain a carbon/nickel concentrate and a filtrate including sodium molybdate (Na2MoO4), sodium metavanadate (NaVCh) and sodium sulfide (Na2SO4). Finally, molybdenum oxide (MoO3) formed from sodium molybdate, vanadium pentoxide (V2O5) formed from sodium metavanadate, and sodium sulfide are recovered from the filtrate.

Description

METHOD FOR RECYCLING METALS FROMCARBON-CONTAINING WASTE MOLYBDENUM CATALYSTSBACKGROUND OF THE INVENTION l. Field of the Invention 1. 1. id="p-1" id="p-1"
[0001] The present invention relates to a method for recycling metalsand, more particularly, to a method for recycling metals fromcarbon-containing Waste molybdenum catalysts. 2. Description of the Related Art 2. 2. id="p-2" id="p-2"
[0002] With the vigorous development of the petrochemistry industry,catalysts used for hydrodesulfurization (HDS) have been used in largequantities. With carbon as the vehicle, the catalysts absorb elements such asiron (Fe) and phosphorus (P), forming inactivated Waste molybdenumcatalysts. 3. 3. id="p-3" id="p-3"
[0003] Valuable metals such as vanadium (V) and molybdenum (Mo)are still present in the Waste molybdenum catalysts; and therefore, byrecovering the valuable metals from the Waste molybdenum catalysts, theeconomic benefits of the Waste molybdenum catalysts can be exerted. As anexample, in the conventional method for recycling metals form Waste molybdenum catalysts, the Waste molybdenum catalysts are mixed With a base, followed by a roasting reaction. A filtrate is obtained after decantating1 the roasted product. Finally, hydrochloric acid (HCl) is used to formmolybdenum oxide (MoOg) from sodium molybdate (Na2MoO4) in thefiltrate. That is, molybdenum in the form of molybdenum oxide can berecovered. 4. 4. id="p-4" id="p-4"
[0004] However, the roasting reaction should be carried out at a hightemperature above 850°C. Especially When carbon is present in the Wastemolybdenum catalyst, the temperature of the roasting reaction burstsinstantly and is difficult to control. Hence, there is a need of providing amethod for recycling metals from carbon-containing Waste molybdenumcatalysts.
SUMMARY OF THE INVENTION . . id="p-5" id="p-5"
[0005] It is therefore the objective of the present invention to providea method for recycling metals from carbon-containing Waste molybdenumcatalysts, in Which the roasting reaction can be omitted. 6. 6. id="p-6" id="p-6"
[0006] One embodiment of the invention discloses the method forrecycling metals from carbon-containing Waste molybdenum catalysts. Themethod for recycling metals from carbon-containing Waste molybdenumcatalysts can include providing a carbon-containing Waste molybdenum catalysts With molybdenum (Mo), vanadium (V), nickel (Ni), carbon (C) and sulfur (S). The carbon-containing Waste molybdenum catalysts is2 mixed With an alkaline solution in a volume ratio ranging from 1: 1 to 1: 4,followed by an alkali leaching reaction at a temperature ranging from 100° C to 400 °C and a pressure ranging from 3 kg/cmz to 15 kg/cmz for a time period ranging from 1 hour to 5 hours, obtaining an alkali leaching solution.
The alkali leaching solution is filtered to obtain a carbon/nickel concentrate and a filtrate including sodium molybdate (Na2MoO4), sodiummetavanadate (NaVOg) and sodium sulfide (Na2SO4). Finally, molybdenumoxide (MoOg) fonned from sodium molybdate, vanadium pentoxide (V2O5)fonned from sodium metavanadate, and sodium sulfide are recovered fromthe f1ltrate. 7. 7. id="p-7" id="p-7"
[0007] Accordingly, in the method for recycling metals fromcarbon-containing Waste molybdenum catalysts according to the presentinvention, the high-pressure alkali leaching reaction can replace the hightemperature roasting reaction of the conventional method for recyclingmetals from Waste molybdenum catalysts. Therefore, the reactiontemperature can be lowered, preventing carbon in the carbon-containingWaste molybdenum catalysts from bursting instantly due to the hightemperature roasting reaction. That is, it is believed that the method for recycling metals from carbon-containing Waste molybdenum catalysts according to the present invention is significantly frugal of energy and cost,3 but highly security. Moreover, sulfur in the carbon-containing Wastemolybdenum catalysts can be recover in the form of sodium sulfate.Therefore, air pollution resulting from the effusion of sulfur oXide (SOX) orhydrogen sulfur (HZS) can be effectively avoided. 8. 8. id="p-8" id="p-8"
[0008] In a preferred forrn shown, the alkaline solution can be anaqueous solution formed by dissolving a strong base in water. As anexample, the strong base can be potassium hydroxide (KOH), sodiumhydroxide (NaOH), barium hydroxide (Ba(OH)2), cesium hydroxide(CsOH), magnesium dihydroxide (Mg(OH)2) or calcium hydroxide(Ca(OH)2), and the alkaline solution can be the aqueous solution with aconcentration ranging from 3% to 15%. As such, few amount of thealkaline solution is needed to react with molybdenum disulf1de, as well asvanadium pentoxidethe, in the carbon-containing waste molybdenumcatalysts, decreasing the volume of the alkaline reaction. 9. 9. id="p-9" id="p-9"
[0009] In a preferred form shown, the carbon-containing wastemolybdenum catalysts can be mixed with the alkaline solution in thevolume ratio ranging from l: 2 to l: 4. As such, the recovery rates ofmolybdenum and vanadium can achieve more than 99%, while the recoveryrate of sulfur can achieve more than 95%. . . id="p-10" id="p-10"
[0010] In a preferred form shown, the alkali leaching reaction can be4 carried out at the temperature ranging from l50°C to 300°C. As such, therecovery rates of molybdenum and vanadium can achieve more than 99%,While the recovery rate of sulfur can achieve more than 95%. 11. 11. id="p-11" id="p-11"
[0011] In a preferred form shown, the alkali leaching reaction can becarried out at the pressure ranging from 10 kg/cmz to 15 kg/cmz. As such,the recovery rates of molybdenum and vanadium can achieve more than99%, While the recovery rate of sulfur can achieve more than 95%. 12. 12. id="p-12" id="p-12"
[0012] In a preferred form shown, the alkali leaching reaction can becarried out for the time period ranging from 2 hours to 4 hours. As such, therecovery rates of molybdenum and vanadium can achieve more than 99%,While the recovery rate of sulfur can achieve more than 95%.
BRIEF DESCRIPTION OF THE DRAWINGS 13. 13. id="p-13" id="p-13"
[0013] The present invention Will become more fully understood fromthe detailed description given hereinafter and the accompanying drawingsWhich are given by Way of illustration only, and thus are not limitative ofthe present invention, and Wherein: 14. 14. id="p-14" id="p-14"
[0014] FIG. l depicts a floW chart representing the method forrecycling metals from carbon-containing Waste molybdenum catalysts according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION5 . . id="p-15" id="p-15"
[0015] The tenn “carbon-containing Waste molybdenum catalysts”recites according to the present invention, besides carbon (C) andmolybdenum (Mo), can also include valuable metals such as vanadium (V)and nickel (Ni). As an example, the carbon-containing Waste molybdenumcatalysts can include, but not limited to, 10-20 Wt% of molybdenum (Mo),1-5 Wt% of vanadium (V), 1-3 Wt% of nickel (Ni), 50-60 Wt% of carbon (C)and 10-20 Wt% of sulfur (S), While the rest is impurities, Which can beappreciated by a person having ordinary skill in the art. 16. 16. id="p-16" id="p-16"
[0016] Refening of FIG. 1, a method for recycling metals fromcarbon-containing Waste molybdenum catalysts according to anembodiment of the present invention can include a step of mixing S1, a stepof leaching S2 and a step of recovering S3. 17. 17. id="p-17" id="p-17"
[0017] Specifically, in the step of mixing S1, the carbon-containingWaste molybdenum catalysts can be mixed With an alkaline solution to fonna mixture. The alkaline solution can be an aqueous solution fonned bydissolving a strong base in Water. As an example, the strong base can be,but not limited to, potassium hydroxide (KOH), sodium hydroxide (NaOH),barium hydroxide (Ba(OH)2), cesium hydroxide (CsOH), magnesium dihydroxide (Mg(OH)2) or calcium hydroxide (Ca(OH)2). Moreover, the strong base can fonn the aqueous solution With a concentration ranging6 from 3% to 15%. That is, the strong base ranging from 3 to 15 grams (g) isdissolved to Water of 100 milliliter (mL) to form the alkaline solution. 18. 18. id="p-18" id="p-18"
[0018] In this embodiment, the carbon-containing Waste molybdenumcatalysts and the alkaline solution are mixed in a volume ratio ranging from1: 1 to 1: 4 to from the mixture. Preferably, the volume ratio of thecarbon-containing Waste molybdenum catalysts to the alkaline solution canrange from 1: 2 to 1: 4. 19. 19. id="p-19" id="p-19"
[0019] In the step of leaching S2, the mixture can be placed in anautoclave, and an alkali leaching reaction can be carried out at a relativelylow temperature and a relatively high pressure, forrning an alkali leachingsolution. At this time, molybdenum, Which is usually present in the form ofmolybdenum disulfide (MoSg), in the carbon-containing Wastemolybdenum catalysts can form sodium molybdate (Na2MoO4) accordingto chemical equation (1), While vanadium, Which is usually present in theform of vanadium pentoxide (V2O5), in the carbon-containing Wastemolybdenum catalysts can form sodium metavanadate (NaVOg) accordingto chemical equation (2). Moreover, both sodium molybdate and vanadium pentoxide are dissolved in the alkaline solution. lVlOsg d" ÖNaOH d" 4. 5O2_>N3,2MOO4+2N3,2SO4+3 H20 EQUATION (1) VzOs +2NaOH->2NaVO3 +H2O EQUATION (2) . . id="p-20" id="p-20"
[0020] In this embodiment, the alkali leaching reaction is carried outat a temperature ranging from 100°C to 400°C and a pressure ranging from3 kg/cmz to 15 kg/cmz for a time period ranging from 1 hour to 5 hours,obtaining the alkali leaching solution. Preferably, the alkali leachingreaction is carried out at the temperature ranging from 150°C to 400°C andthe pressure ranging from 10 kg/cmz to 15 kg/cmz for the time periodranging from 2 hours to 4 hours. 21. 21. id="p-21" id="p-21"
[0021] The step of recovering S3 can include a substep of Nirecovering S31. In the substep of Ni recovering S31, the alkali leachingsolution can be filtrated using a 100-mesh filter. Thus, a carbon/nickelconcentrate separated from a f1ltrate can form a carbon bar by subsequentprocessing process and can be used for fuel. 22. 22. id="p-22" id="p-22"
[0022] The filtrate can include molybdenum in the form of sodiummolybdate, as Well as sulfur in the form of sodium sulfate (Na2SO4).Moreover, in the case that the carbon-containing Waste molybdenumcatalysts include vanadium, the filtrate can also include vanadium in theform of sodium metavanadate. 23. 23. id="p-23" id="p-23"
[0023] Therefore, the step of recovering S3 can also include a substep of V recovering S32, a substep of Mo recovering S33 and substep of Ss recovering S34. In the substep of V recovering S32, sodium molybdate canform molybdenum oxide (MoOg) by the use of hydrochloric acid (HCl) inan acidic environment according to chemical equation (3). In the substep ofMo recovering S33, sodium metavanadate can form vanadium pentoxide(V2O5) by the use of sulfuric acid (H2SO4) in an acidic environmentaccording to chemical equation (4). Finally, in the substep of S recovering S34, sodium sulfate is supersaturated to participate in the form of sodium sulfate.Na2MoO4 + HCl->MoO3 + NaCl + H20 EQUATION (3)2N2lVO3 d" H2SO4_>N3,2SO4 d" V2O5 d" H20 EQUATION (4) 24. 24. id="p-24" id="p-24"
[0024] To evaluate the valuable metals of molybdenum, vanadiumand nickel, as Well as carbon and sulfur, can be effectively recoveredaccording to the method for recycling metals from carbon-containing Wastemolybdenum catalysts, the following trials are carried out using thecarbon-containing Waste molybdenum catalysts With 15 Wt% ofmolybdenum, 3.5 Wt% of vanadium, 1.1 Wt% of nickel, 50.1 Wt% of carbonand 10 Wt% of sulfur, While the rest being impurities. . . id="p-25" id="p-25"
[0025] Trial (A). 26. 26. id="p-26" id="p-26"
[0026] In trial (A), 1000 grams (g) of the carbon-containing Waste molybdenum catalysts is mixed With the alkaline solution according to the9 volume ratio shown in TABLE 1. The alkali leaching reaction is then carried out at the temperature of 150°C and the pressure of 10 kg/cmz for the time period of 2 hours. Finally, recovery rates of molybdenum, vanadium, nickel, carbon and sulfur in the alkali leaching solution are measured.TABLE1Recovery Yield (grams)VolumeGroup [Recovery Rate (%)]Ratiomolybdenum vanadium nickel carbon sulfur145.5 33.3 10.7 498.1 95.4A1 1:1[97.0%] [95.1%] [97.3%] [99.4%] [95.4%]148.5 34.7 10.8 498.5 95.8A2 1:2[99.0%] [99.1%] [98.2%] [99.5%] [95.8%]148.0 34.7 10.8 498.9 96.6A3 1:3[98.7%] [99.1%] [98.2%] [99.6%] [96.6%]149.1 34.8 10.4 498.8 97.1A4 1:4[99.4%] [99.4%] [94.5%] [99.6%] [97.1%] 27. 27. id="p-27" id="p-27"
[0027] Referring to TABLE 1, in the case that the volume ratio higher than 1: 2, the recovery rates of molybdenum and vanadium can achieve more than 99%. The recovery rate of sulfur can achieve more than 95%. 28. 28. id="p-28" id="p-28"
[0028] Trial (B). 29. 29. id="p-29" id="p-29"
[0029] In trial (B), 1000 grams (g) of the carbon-containing Waste molybdenum catalysts is mixed With the alkaline solution according to the volume ratio of 1: 2. The alkali leaching reaction is then carried out at the temperature shown in TABLE 2 and the pressure of 10 kg/cmz for the time period of 2 hours. Finally, recovery rates of molybdenum, vanadium, nickel, carbon and sulfur in the alkali leaching solution are measured.
TABLE2Recovery Yield (grams)TemperatureGroup [Recovery Rate (%)](OC)molybdenum vanadium nickel carbon sulfur146.5 32.8 10.5 499.1 93.4Bl 100[97.3%] [93.7%] [95.5%] [99.6%] [93.4%]148.5 34.7 10.8 498.5 95.8B2 150[99.0%] [99.1%] [98.2%] [99.5%] [95.8%]149.1 34.7 10.6 498.3 96.9B3 200[99.4%] [99.1%] [96.4%] [99.5%] [96.9%]149.2 34.8 10.7 498.6 98.1B4 300[99.5%] [99.4%] [97.3%] [99.5%] [98.1%] . . id="p-30" id="p-30"
[0030] Referring to TABLE 2, in the case that the temperature higher than 150°C, the recovery rates of molybdenum and vanadium can achieve more than 99%. The recovery rate of sulfur can achieve more than 95%. ll 31. 31. id="p-31" id="p-31"
[0031] Trial (C). 32. 32. id="p-32" id="p-32"
[0032] In trial (C), 1000 grams (g) of the carbon-containing Waste molybdenum catalysts is mixed With the alkaline solution according to the Volume ratio of 1: 2. The alkali leaching reaction is then carried out at the temperature of 150°C and the pressure shown in TABLE 3 for the timeperiod of 2 hours. Finally, recovery rates of molybdenum, vanadium, nickel,carbon and sulfur in the alkali leaching solution are measured.TABLE 3Recovery Yield (grams)PressureGroup [Recovery Rate (%)](kg/cmz)molybdenum vanadium nickel carbon sulfur145.5 33.8 10.6 498.9 94.4C1 3[97.0%] [96.6%] [96.4%] [99.6%] [94.4%]148.5 34.7 10.8 498.5 95.8C2 10[99.0%] [99.1%] [98.2%] [99.5%] [95.8%]148.9 34.9 10.7 499.3 95.9C3 13[99.3%] [99.7%] [97.3%] [99.7%] [95.9%]148.7 34.8 10.7 498.9 96.1C4 15[99.1%] [99.4%] [97.3%] [99.6%] [96.1%][0033] Referring to TABLE 3, in the case that the pressure higherthan 10 kg/cmz, the recovery rates of molybdenum and vanadium can achieve more than 99%. The recovery rate of sulfur can achieve more than 95%. 34. 34. id="p-34" id="p-34"
[0034] Trial (D). . . id="p-35" id="p-35"
[0035] In trial (D), 1000 grams (g) of the carbon-containing Waste molybdenum catalysts is mixed With the alkaline solution according to the volume ratio of 1: 2. The alkali leaching reaction is then carried out at the temperature of 150°C and the pressure of 10 kg/cmz for the time period shown in TABLE 4. Finally, recovery rates of molybdenum, vanadium, nickel, carbon and sulfur in the alkali leaching solution are measured.
TABLE 4Time Recovery Yield (grams)Group Period [Recovery Rate (%)](hours) molybdenum vanadium nickel carbon sulfur145.5 32.9 10.7 498.9 92.4D1 1[97.0%] [94.0%] [97.3%] [99.6%] [92.4%]148.5 34.7 10.8 498.5 95.8D2 2[99.0%] [99.1%] [98.2%] [99.5%] [95.8%]149.4 34.8 10.7 499.3 95.8D3 3[99.6%] [99.4%] [97.3%] [99.7%] [95.8%]149.7 34.8 10.8 498.9 96.5D4 4[99.8%] [99.4%] [98.2%] [99.6%] [96.5%] 13 36. 36. id="p-36" id="p-36"
[0036] Referring to TABLE 4, in the case that the time period morethan 2 hours, the recovery rates of molybdenum and vanadium can achievemore than 99%. The recovery rate of sulfur can achieve more than 95%. 37. 37. id="p-37" id="p-37"
[0037] Accordingly, in the method for recycling metals fromcarbon-containing Waste molybdenum catalysts according to the presentinvention, the high-pressure alkali leaching reaction can replace the hightemperature roasting reaction of the conventional method for recyclingmetals from Waste molybdenum catalysts. Therefore, the reactiontemperature can be lowered, preventing carbon in the carbon-containingWaste molybdenum catalysts from bursting instantly due to the hightemperature roasting reaction. That is, it is believed that the method forrecycling metals from carbon-containing Waste molybdenum catalystsaccording to the present invention is significantly frugal of energy and cost,but highly security. 38. 38. id="p-38" id="p-38"
[0038] Moreover, sulfur in the carbon-containing Waste molybdenumcatalysts can be recover in the form of sodium sulfate. Therefore, airpollution resulting from the effusion of sulfur oxide (SOX) or hydrogensulfur (HZS) can be effectively avoided. 39. 39. id="p-39" id="p-39"
[0039] In carbon in the addition, carbon-containing Waste molybdenum catalysts can be effectively recovered (With the recovery rate14 achieving more than 99%). The recovered carbon/nickel concentrate canform the carbon bar by subsequent processing process and can be used forfuel. 40. 40. id="p-40" id="p-40"
[0040] Although the invention has been described in detail Withreference to its presently preferable embodiment, it Will be understood byone of ordinary skill in the art that various modifications can be madeWithout departing from the spirit and the scope of the invention, as set forth in the appended claims.

Claims (8)

WHAT IS CLAIMED IS
1. l. A method for recycling metals from carbon-containing Wastemolybdenum catalysts, comprising:providing carbon-containing Waste molybdenum catalysts Withmolybdenum (Mo), vanadium (V), nickel (Ni), carbon (C) and sulfur (S); mixing the carbon-containing Waste molybdenum catalysts and analkaline solution in a volume ratio ranging from 1: l to 1: 4, followed by analkali leaching reaction at a temperature ranging from l00°C to 400 °C anda pressure ranging from 3 kg/cmz to 15 kg/cmz for a time period rangingfrom 1 hour to 5 hours, obtaining an alkali leaching solution; filtering the alkali leaching solution to obtain a carbon/nickelconcentrate and a filtrate including sodium molybdate (Na2MoO4), sodiummetavanadate (NaVOg) and sodium sulf1de (Na2SO4); and forming molybdenum oxide (MoOg) and vanadium pentoxide (V2O5)from sodium molybdate and sodium metavanadate, respectively, andrecovering molybdenum oxide, vanadium pentoxide and sodium sulfatefrom the filtrate.
2. The method for recycling metals from carbon-containing Waste molybdenum catalysts as claimed in claim l, Wherein the alkaline solution is an aqueous solution formed by dissolving a strong base in Water.16
3. The method for recycling metals from carbon-containing Wastemolybdenum catalysts as claimed in claim 2, Wherein the strong base ispotassium hydroxide (KOH), sodium hydroxide (NaOH), barium hydroxide(Ba(OH)2), cesium hydroxide (CsOH), magnesium dihydroxide (Mg(OH)2)or calcium hydroxide (Ca(OH)2).
4. The method for recycling metals from carbon-containing Wastemolybdenum catalysts as claimed in claim 2, Wherein the alkaline solutionis the aqueous solution With a concentration ranging from 3% to 15%.
5. The method for recycling metals from carbon-containing Wastemolybdenum catalysts as claimed in claim l, Wherein thecarbon-containing Waste molybdenum catalysts are mixed With the alkalinesolution in the volume ratio ranging from 1: 2 to 1: 4.
6. The method for recycling metals from carbon-containing Wastemolybdenum catalysts as claimed in claim l, Wherein the alkali leachingreaction is carried out at the temperature ranging from l50°C to 300°C.
7. The method for recycling metals from carbon-containing Wastemolybdenum catalysts as claimed in claim l, Wherein the alkali leachingreaction is carried out at the pressure ranging from 10 kg/cmz to 15 kg/cmz.
8. The method for recycling metals from carbon-containing Waste molybdenum catalysts as claimed in claim l, Wherein the alkali leaching17 reaction is carried out for the time period ranging from 2 hours to 4 hours.
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Citations (9)

* Cited by examiner, † Cited by third party
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