WO2014091903A1 - 硫化水素を含む貧液の処理方法及び処理装置 - Google Patents
硫化水素を含む貧液の処理方法及び処理装置 Download PDFInfo
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- WO2014091903A1 WO2014091903A1 PCT/JP2013/081471 JP2013081471W WO2014091903A1 WO 2014091903 A1 WO2014091903 A1 WO 2014091903A1 JP 2013081471 W JP2013081471 W JP 2013081471W WO 2014091903 A1 WO2014091903 A1 WO 2014091903A1
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- aeration
- hydrogen sulfide
- reaction vessel
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- containing hydrogen
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 238000003672 processing method Methods 0.000 title abstract description 3
- 238000005273 aeration Methods 0.000 claims abstract description 122
- 239000007788 liquid Substances 0.000 claims abstract description 80
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 76
- 238000006243 chemical reaction Methods 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims description 52
- 238000003756 stirring Methods 0.000 claims description 18
- 238000005486 sulfidation Methods 0.000 claims description 17
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 15
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000013019 agitation Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 25
- 238000002386 leaching Methods 0.000 description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 239000002002 slurry Substances 0.000 description 9
- 238000001784 detoxification Methods 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 238000005987 sulfurization reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 3
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- IPRPPFIAVHPVJH-UHFFFAOYSA-N (4-hydroxyphenyl)acetaldehyde Chemical compound OC1=CC=C(CC=O)C=C1 IPRPPFIAVHPVJH-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0005—Degasification of liquids with one or more auxiliary substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2311—Mounting the bubbling devices or the diffusers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23121—Diffusers having injection means, e.g. nozzles with circumferential outlet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/86—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- 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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0407—Leaching processes
- C22B23/0415—Leaching processes with acids or salt solutions except ammonium salts solutions
- C22B23/043—Sulfurated acids or salts thereof
-
- 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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
- C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231266—Diffusers characterised by the shape of the diffuser element being in the form of rings or annular elements
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
Definitions
- the present invention relates to a treatment method and a treatment apparatus for a poor liquid containing hydrogen sulfide, such as a process liquid after sulfidation treatment of a nickel oxide ore plant.
- a treatment method and a treatment apparatus for a poor liquid containing hydrogen sulfide such as a process liquid after sulfidation treatment of a nickel oxide ore plant.
- HPAL High Pressure Acid
- the pretreatment step (1), the leaching step (2), the solid-liquid separation step (3), The sum process (4), the dezincification process (5), the sulfurization process (6), and the detoxification process (7) are included (for example, refer patent document 1).
- nickel oxide ore is crushed and classified into a slurry.
- the leaching step (2) sulfuric acid is added to the slurry obtained in the pretreatment step (1), and the mixture is stirred at 220 to 280 ° C., and high-temperature pressure acid leaching is performed to obtain a leaching slurry.
- the leaching slurry obtained in the leaching step (2) is subjected to solid-liquid separation to obtain a leachate containing nickel and cobalt (hereinafter referred to as “crude nickel sulfate aqueous solution”) and the leaching residue. obtain.
- the crude nickel sulfate aqueous solution obtained in the solid-liquid separation step (3) is neutralized.
- step (5) hydrogen sulfide gas is added to the crude nickel sulfate aqueous solution neutralized in the neutralization step (4) to precipitate and remove zinc as zinc sulfide.
- the sulfidation step (6) hydrogen sulfide gas is added to the dezincification final solution obtained in the dezincification step (5) to obtain a nickel / cobalt composite sulfide and a nickel poor solution.
- the heavy metal was solidified as a hydroxide and removed by the final neutralization treatment, so that the leach residue generated in the solid-liquid separation step (3) and the sulfidation step (6) occurred. Detoxify nickel poor solution.
- nickel oxide ore contains many kinds of heavy metals, and is dissolved under high temperature and high pressure conditions using sulfuric acid. Collect the necessary metals.
- sulfurization reaction hydrogen sulfide gas or a salt such as sodium hydrogen sulfide or sodium sulfide is used, but unreacted sulfide remains after the sulfurization step.
- JP 2011-225908 A JP-A-2005-350766 Japanese Patent Application Laid-Open No. 08-071585 JP-A-10-258222
- the present invention has been made in view of such a situation, and the object of the present invention is, for example, in a solution containing hydrogen sulfide gas such as a process liquid after sulfidation in a hydrometallurgical treatment of nickel oxide ore.
- An object of the present invention is to provide a processing method and a processing apparatus for a poor solution capable of effectively reducing dissolved hydrogen sulfide gas.
- annular aeration tube having a large number of outlets is provided at the bottom of a vertical cylindrical reaction vessel, and the annular aeration tube is stirred while the poor liquid containing hydrogen sulfide is stirred in the reaction vessel. Hydrogen sulfide is removed from the poor liquid by aeration using a simple aeration apparatus that blows aeration gas from a large number of outlets.
- the present invention is a method for treating a poor liquid containing hydrogen sulfide, which is provided in a vertical cylindrical reaction vessel, a stirring blade provided in the reaction vessel, and a bottom portion in the reaction vessel.
- a poor liquid containing hydrogen sulfide is stirred by the rotation of the stirring blades, it is introduced into the reaction vessel from the numerous outlets of the aeration pipe.
- hydrogen sulfide is removed from the poor solution.
- the present invention is also a treatment apparatus for a poor liquid containing hydrogen sulfide, which is provided at a vertical cylindrical reaction vessel, a stirring blade provided in the reaction vessel, and a bottom portion in the reaction vessel.
- An aeration tank provided with an annular aeration pipe having a large number of air outlets, and in the aeration tank, the poor liquid containing hydrogen sulfide is agitated by the rotation of the agitation blades, and a plurality of aeration pipes of the aeration pipe are agitated.
- Hydrogen sulfide is removed from the poor solution by introducing aeration gas into the reaction vessel from the outlet and aeration.
- the poor liquid may be a process liquid after sulfidation treatment in a nickel oxide ore hydrometallurgical plant.
- aeration can be performed by the aeration tube formed in an annular shape with a size of 70 to 90% of the diameter of the reaction vessel.
- aeration can be performed from the above-described air outlet formed in a circular shape having a diameter of 10 to 20 mm.
- 10 to 20 short pipe aerations installed at equal intervals on the aeration pipe as the outlet may be performed.
- the gas for aeration can be air.
- an annular aeration pipe having a large number of outlets is provided at the bottom of a vertical cylindrical reaction vessel, and an annular aeration is carried out while stirring a poor liquid containing hydrogen sulfide in the reaction vessel.
- a reaction vessel with a stirring blade for adding slurry after leaching into a poor solution obtained from a sulfidation process of a nickel oxide ore wet processing plant can be suitably used as an aeration tank. It is possible to effectively reduce the hydrogen sulfide gas generated in the recycling process and the subsequent wastewater treatment process.
- FIG. 1 is a perspective view illustrating a configuration of a main part of a configuration example of a poor liquid treatment apparatus to which the present invention is applied.
- FIG. 2 is a process diagram of a nickel oxide ore hydrometallurgical plant in which a poor liquid treatment apparatus is used.
- FIG. 3 is a perspective view showing a configuration example of an air outlet provided in the aeration pipe in the poor liquid treatment apparatus.
- FIG. 4 is a process diagram of a nickel oxide ore plant by a high pressure acid leaching method.
- the poor liquid treatment method according to the present embodiment is performed by a poor liquid treatment apparatus 100 having a configuration as shown in FIG. 1, for example.
- This poor liquid treatment apparatus 100 is a circle having a vertical cylindrical reaction vessel 110, a stirring blade 120 provided in the reaction vessel 110, and a large number of air outlets 131 provided at the bottom of the reaction vessel 110.
- the multiple liquid outlets 131 of the aeration pipe 130 are stirred in the vertical cylindrical reaction vessel 110 while the poor liquid containing hydrogen sulfide is stirred by the rotation of the stirring blade 120. Then, aeration gas is introduced into the reaction vessel 110 and aerated to remove hydrogen sulfide from the poor solution.
- the heavy metal is solidified and removed as a hydroxide by the final neutralization treatment, thereby removing the leach residue generated in the solid-liquid separation process.
- the nickel poor solution generated in the sulfurization process is made harmless and discarded.
- a hydrogen sulfide removal process is provided before the detoxification process, and in the hydrogen sulfide removal process, the above-described poor liquid treatment apparatus 100 is used. Then, hydrogen sulfide is removed from the poor liquid obtained as a process liquid after sulfidation (liquid after sulfidation).
- annular aeration pipe 130 having a large number of air outlets 131 is provided in a reaction tank for removing hydrogen sulfide from a poor liquid containing hydrogen sulfide obtained as a process liquid after sulfidation in the previous stage of the detoxification process.
- this reaction tank is used as the above-mentioned poor liquid processing apparatus 100.
- a poor liquid containing hydrogen sulfide obtained as a process liquid after the sulfidation treatment is charged into the vertical cylindrical reaction vessel 110, and the reaction vessel In 110, the poor liquid containing hydrogen sulfide is stirred by the rotation of the stirring blade 120. Then, in the reaction vessel 100, air as aeration gas is introduced into the poor liquid from the numerous outlets 131 of the aeration pipe 130 and aerated, whereby the sulfur content of the residual hydrogen sulfide in the poor liquid is reduced. It is reduced to sulfur and hydrogen sulfide is removed from the poor solution.
- the poor liquid treatment apparatus 100 that performs the poor liquid treatment method according to the present embodiment includes a vertical cylindrical reaction vessel 110, a stirring blade 120 provided in the reaction vessel 110, and the reaction vessel 110. And an aeration tank provided with an annular aeration pipe 130 having a large number of air outlets 131 provided at the bottom of the tank, while stirring the poor liquid containing hydrogen sulfide by the rotation of the stirring blade 120 in the aeration tank, Aeration gas is introduced into the reaction vessel 110 from the numerous outlets 131 of the aeration pipe 130 and aerated to remove hydrogen sulfide from the poor solution.
- the poor liquid treatment apparatus 100 not only the poor liquid containing hydrogen sulfide is uniformly stirred by the rotation of the stirring blade 120 in the reaction vessel 110, that is, the aeration tank, but also the aeration gas is supplied to the reaction vessel 110. Infuse. As a result, residual hydrogen sulfide is expelled from the stirred poor liquid by aeration, and the residual concentration of hydrogen sulfide is reduced.
- this poor liquid treatment apparatus 100 aeration is performed via an annular aeration tube 130 having a large number of air outlets 131 provided at the bottom of the reaction vessel 110, and bubbles flowing into the reaction vessel 110 are removed. The total area of the bubbles is increased by breaking them down. Thereby, many bubbles can be contacted with the poor liquid containing hydrogen sulfide uniformly stirred in the reaction vessel 110, and a high aeration effect can be obtained. That is, since the gas for aeration supplied into the reaction vessel 110 is dispersed on the bottom of the aeration tank immediately after being supplied, it can be efficiently aerated over the entire poor solution.
- the reaction setting time in the stirring reaction apparatus is generally shorter than a sufficient aeration time by a general aeration apparatus.
- the residence time in the reaction vessel 110 is assumed by providing the reaction vessel 110 with an aeration function, it is not always necessary to ensure a sufficient aeration time. As described above, aeration can be performed efficiently and hydrogen sulfide can be effectively reduced.
- the poor liquid from which hydrogen sulfide has been removed by the poor liquid treatment apparatus 100 can be returned to the solid-liquid separation process and reused as cleaning water, as shown in the process diagram of FIG.
- the hydrogen sulfide removing step is provided before the detoxification step, and in this hydrogen sulfide removing step, the residual hydrogen sulfide can be effectively reduced by aeration using the above-described poor liquid treatment apparatus 100. Therefore, generation of hydrogen sulfide gas in the process of reusing the solution after sulfidation or the wastewater treatment process can be suppressed.
- the gas for aeration is not particularly limited as long as it is a gas that maintains bubbles in the liquid, that is, does not easily dissolve in the liquid, but it is preferable in terms of cost to use air.
- the shape of the aeration tube is not particularly limited, but it is preferably formed in an annular shape having a size of 70 to 90% with respect to the diameter of the reaction solution 120.
- the aeration tube 130 in the poor liquid treatment apparatus 100 is formed in an annular shape having a size of 70 to 90% with respect to the diameter of the reaction vessel 110. It can be seen that a high aeration effect can be obtained.
- the air can be efficiently raised along the tank wall.
- the air outlet 131 formed in the aeration pipe is not particularly limited, but is preferably formed in a circular shape having a diameter of 10 to 20 mm.
- the air outlet 131 of the aeration pipe 130 in the poor liquid treatment apparatus 100 is formed in a circular shape having a diameter of 10 to 20 mm, so that a high aeration effect can be obtained. I understand that I can do it.
- the number of the air outlets 131 is not particularly limited, and is preferably determined as appropriate depending on the circumferential length of the aeration pipe. For example, the number is preferably about 10, more preferably 20. More preferred.
- Table 3 shows the results of observing the relationship between the number of air outlets 131 and the aeration effect when the number of air outlets 131 is changed.
- increasing the number of the air outlets 131 weakens the upward flow of air and increases the residence time of the air in the aeration tank, so that the aeration efficiency increases. If the number of the air outlets 131 is less than 10, the aeration effect becomes insufficient. If the number is increased successively, the effect increases, but if the number is more than 20, the aeration effect is hardly improved further.
- the air outlet 131 is not a simple hole but a short pipe (blower outlet) attached to the provided hole because the gas flow is rectified and the bubble size is stabilized.
- the number of outlets is preferably about 10 to 20.
- the aeration pipe 130 obtains an even higher aeration effect by performing aeration with about 10 to 20 short pipes 131A installed at equal intervals as the air outlet 131, for example, as shown in FIG. be able to.
- the poor liquid treatment using the above-described poor liquid treatment apparatus 100 was performed.
- Table 4 shows the results obtained by measuring the dissolved hydrogen sulfide concentration in the poor solution with and without aeration.
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- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
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Claims (12)
- 縦型円筒形状の反応容器と、上記反応容器内に設けられた撹拌羽根と、上記反応容器内の底部に設けられた多数の吹出口を有する円環状のエアレーション管とを備える曝気槽内で、
硫化水素を含む貧液を上記撹拌羽根の回転により撹拌しながら、上記エアレーション管の多数の吹出口から上記反応容器内に曝気用の気体を導入してエアレーションすることにより、上記貧液から硫化水素を除去することを特徴とする硫化水素を含む貧液の処理方法。 - 上記貧液は、ニッケル酸化鉱石の湿式製錬プラントにおける硫化処理後の工程液であることを特徴とする請求項1に記載の硫化水素を含む貧液の処理方法。
- 上記反応容器の直径の70~90%のサイズの円環状に形成された上記エアレーション管によりエアレーションを行うことを特徴とする請求項1に記載の硫化水素を含む貧液の処理方法。
- 直径が10~20mmの円形に形成された上記吹出口からエアレーションを行うことを特徴とする請求項3に記載の硫化水素を含む貧液の処理方法。
- 上記吹出口として上記エアレーション管に等間隔に設置された10乃至20個の短管パイプを介してエアレーションを行うことを特徴とする請求項4に記載の硫化水素を含む貧液の処理方法。
- 上記曝気用の気体は空気であることを特徴とする請求項5に記載の硫化水素を含む貧液の処理方法。
- 縦型円筒形状の反応容器と、上記反応容器内に設けられた撹拌羽根と、上記反応容器内の底部に設けられた多数の空気吹出口を有する円環状のエアレーション管とを備える曝気槽からなり、
上記曝気槽内で、硫化水素を含む貧液を上記撹拌羽根の回転により撹拌しながら、上記エアレーション管の多数の吹出口から上記反応容器内に曝気用の気体を導入してエアレーションすることにより、上記貧液から硫化水素を除去することを特徴とする硫化水素を含む貧液の処理装置。 - 上記貧液は、ニッケル酸化鉱石の湿式製錬プラントにおける硫化処理後の工程液であることを特徴とする請求項7に記載の硫化水素を含む貧液の処理装置。
- 上記反応容器の直径の70~90%のサイズの円環状に形成された上記エアレーション管によりエアレーションを行うことを特徴とする請求項7に記載の硫化水素を含む貧液の処理装置。
- 直径が10~20mmの円形に形成された上記吹出口からエアレーションを行うことを特徴とする請求項9に記載の硫化水素を含む貧液の処理装置。
- 上記吹出口として上記エアレーション管に等間隔に設置された10乃至20個の短管パイプを介してエアレーションを行うことを特徴とする請求項10に記載の硫化水素を含む貧液の処理装置。
- 上記曝気用の気体は空気であることを特徴とする請求項11に記載の硫化水素を含む貧液の処理装置。
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