JP2013249253A - Hydrogen sulfide gas production plant and method for recovering and using waste hydrogen sulfide gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrogen sulfide gas production plant capable of recovering discharged waste hydrogen sulfide gas, efficiently supplying the recovered gas to a treatment plant that performs a treatment by using the hydrogen sulfide gas, and effectively using sulfur; and to provide a method for recovering and using the waste hydrogen sulfide gas by the hydrogen sulfide gas production plant.SOLUTION: A hydrogen sulfide gas production plant includes a piping which recovers waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant, and the one end of which is connected to a treatment plant using hydrogen sulfide gas. Through the piping, the discharged waste hydrogen sulfide gas is recovered and the recovered waste hydrogen sulfide gas is supplied to the treatment plant. A portion of sulfur supplied to reaction equipment is cooled in sulfur cooling equipment, and the cooled sulfur is again supplied to the reaction equipment by a circulation pump and/or the cooled sulfur is supplied to a sulfur treatment plant using sulfur.

Description

  The present invention relates to a hydrogen sulfide gas production plant and a method for recovering and using waste hydrogen sulfide gas. More specifically, the present invention can recover discharged hydrogen sulfide gas and supply it to a processing plant that uses hydrogen sulfide gas. The present invention relates to a hydrogen sulfide gas production plant and a method for recovering and using waste hydrogen sulfide gas by the hydrogen sulfide gas production plant.

  For example, in the hydrometallurgical method of nickel oxide ore, hydrogen sulfide gas is blown into the solution obtained by neutralizing the leachate of nickel oxide ore and the solution for recovering nickel from which impurities have been removed. Sulfurization treatment is performed.

  The hydrogen sulfide gas used at this time is manufactured by, for example, a hydrogen sulfide gas manufacturing plant having a configuration as shown in FIGS.

  Specifically, a hydrogen sulfide gas production plant 50 shown in FIG. 5 includes a reaction facility 51 that generates hydrogen sulfide gas from supplied sulfur and hydrogen gas, a cooling facility 52 that cools the hydrogen sulfide gas, and a hydrogen sulfide gas. A cleaning facility 53 for cleaning sulfur contained therein, and a drying facility 54 for drying the hydrogen sulfide gas after cleaning to remove moisture. Further, the hydrogen sulfide gas production plant 50 includes a storage facility 55 that stores the generated hydrogen sulfide gas and a supply facility 56 that supplies the hydrogen sulfide gas as ancillary facilities.

  In the hydrogen sulfide gas production plant 50, a catalyst is used in the reactor 51 for the purpose of reducing activation energy. Further, in the hydrogen sulfide gas production plant 50, the sulfur contained in the produced hydrogen sulfide gas is removed by the cleaning equipment 53, and then the moisture is removed by the drying equipment 54, thereby preventing the equipment from being corroded by moisture.

  Further, in the hydrogen sulfide gas production plant 50, the produced hydrogen sulfide gas is boosted to a required pressure using a supply facility 56 such as a compressor, and the pressurized hydrogen sulfide gas is made from, for example, the above-described nickel oxide ore wet-made. Supplied to a plant that uses hydrogen sulfide gas in the dezincing process or sulfiding process of the smelting method.

  The hydrogen sulfide gas production plant 50 is operated at a pressure of about 5 kPaG and a temperature of about 380 ° C. as conditions for producing the hydrogen sulfide gas. In the hydrogen sulfide gas production plant 50, since a catalyst is used for the reaction equipment 51, it is possible to operate under conditions where both pressure and temperature are low, which is an operational advantage.

  However, in the hydrogen sulfide gas production plant 50, in addition to the need to periodically replace the catalyst in the reaction facility 51, the quality of sulfur, which is a raw material for hydrogen sulfide gas, is strictly controlled from the viewpoint of the life of the catalyst. There is a need to.

  On the other hand, the hydrogen sulfide gas production plant 60 shown in FIG. 6 is a plant that does not use a catalyst in the reactor. As shown in FIG. 6, the hydrogen sulfide gas production plant 60 includes a reaction facility (reactor 66, quench tower 67, heater 68) 61 that generates hydrogen sulfide gas from sulfur and hydrogen gas, and cooling that cools the hydrogen sulfide gas. Facility 62 (62A, 62B), knockout facility 63 for removing sulfur in hydrogen sulfide gas and supplying hydrogen sulfide gas, and blowdown facility 64 for recovering sulfur removed from hydrogen sulfide gas and supplying it to a sulfur treatment plant or the like It consists of and. In addition, the hydrogen sulfide gas production plant 60 includes, as ancillary equipment, equipment 65 that cools the temperature of sulfur in order to adjust the heat balance.

  In the hydrogen sulfide gas production plant 60, molten sulfur is stored in the reactor 66 of the reaction facility 61, and hydrogen gas is supplied from the lower portion, so that the generation reaction of hydrogen sulfide gas proceeds while the hydrogen gas passes through the molten sulfur. To do. In addition, sulfur reduced by the reaction is supplied from the upper part of the reaction facility 61. Although most of the hydrogen sulfide gas generated in the reaction facility 61 is hydrogen sulfide, it contains sulfur vapor that is entrained when the hydrogen gas passes through the reactor.

  Further, the hydrogen sulfide gas production plant 60 is operated under conditions of high temperature and high pressure such as a pressure of about 800 kPaG and a temperature of about 470 ° C. as conditions for producing the hydrogen sulfide gas. The generated hydrogen sulfide gas is lowered to a temperature of about 150 ° C. when it exits the quench tower 67 constituting the reaction facility 61, and is further about 50 ° C. in the cooling facility 62 (used in the supply destination facility). Temperature) and transferred to the knockout facility 63.

  Further, most of the sulfur contained in the hydrogen sulfide gas generated in the reaction facility 61 is made up of valves such as control valves and manual valves in plants that use the hydrogen sulfide gas to be supplied, thermometers and pressure gauges. If it adheres to the instruments such as, it will cause a big trouble in operation. Therefore, it is solidified once in the knockout facility 63, and the sulfur deposited on the bottom thereof is melted and recovered by heating with steam through a jacket installed around the lower part of the knockout facility 63. The recovered sulfur is stored in the blow-down facility 64 and then supplied to the sulfur treatment plant using the supply pump 69 to be processed or repeatedly used.

  Thus, after the sulfur contained in the hydrogen sulfide gas produced | generated in the hydrogen sulfide gas manufacturing plant 60 was isolate | separated with the knockout drum, the hydrogen sulfide gas is the hydrometallurgy method of the nickel oxide ore mentioned above, for example Supplied to a plant that uses hydrogen sulfide gas in a dezincing process, a sulfiding process, or the like.

  Since the hydrogen sulfide gas production plant 60 is operated and managed with the pressure in the system being high, facilities such as a compressor and a chiller facility become unnecessary, and initial investment can be suppressed. Further, there is an advantage that the operation cost can be reduced because the periodic replacement of the catalyst as in the hydrogen sulfide gas production plant 50 described above, the replacement cost for the catalyst, and the maintenance cost including the quality control of sulfur are unnecessary.

  However, since the hydrogen sulfide gas production plant 60 operates under conditions of high pressure and high temperature, when supplying the produced hydrogen sulfide gas, the hydrogen sulfide gas production plant 60 can be depressurized to an appropriate pressure in the plant operation of the supply destination. I need it. For example, in a plant in a sulfidation process in which nickel oxide ore is processed to produce a mixed sulfide (mixed sulfide: MS) containing nickel and cobalt, hydrogen sulfide gas is operated at a pressure of about 350 kPaG. In the plant in the dezincing step in which zinc contained in the neutralized final solution is converted into zinc sulfide, the hydrogen sulfide gas is operated at a pressure of about 5 kPaG or less. Further, since the hydrogen sulfide gas production plant 60 is operated under conditions of high pressure and high temperature, there is a high risk of gas leakage, and hydrogen sulfide gas that is a facility for cooling sulfur (sulfur vapor) contained in hydrogen sulfide gas. The load on the cooling facility 62 and the knockout facility 63, which is a facility for recovering hydrogen sulfide gas, increases.

  Further, in the hydrogen sulfide gas production plant 60, sulfur contained in the generated hydrogen sulfide gas is removed by the knockout equipment 63, but some sulfur is solidified in the cooling equipment 62 and fixed inside thereof. If left as it is, the operation efficiency is lowered. Therefore, a plurality of cooling facilities are provided, and they are used by switching them alternately. Specifically, for example, two cooling facilities 62A and 62B are provided, and the cooling facility 62A used in the state where the cooling capacity is reduced due to sulfur fixed inside the cooling facility 62A (the state where the inside is fixed) And the standby cooling equipment 62B (equipment with the internal sticking removed). And it is set as a standby state by melt | dissolving and collect | recovering the sulfur adhering in an installation using steam about the cooling equipment 62A in which the cooling capacity fell. By repeating these operations, the operating rate of the hydrogen sulfide gas production plant 60 is prevented from decreasing. The sulfur melted and recovered by the cooling facility 62 (62A, 62B) is transferred to the blowdown facility 64 and processed in the same manner.

  By the way, in the hydrogen sulfide gas production plant 60, as described above, the cooling facility 62 (for example, the cooling facility 62A) in which sulfur is fixed and switched for the melting process is used to cool the hydrogen sulfide gas until just before that. It is a thing. Therefore, high-pressure and high-concentration hydrogen sulfide gas is held in the cooling facility 62A. Therefore, when the sulfur fixed on the inner wall of the cooling facility 62A is melted and recovered, it is necessary to release the pressure in the cooling facility 62A.

  However, the hydrogen sulfide gas generated when the pressure is released becomes so-called waste hydrogen sulfide gas, which is a loss. Further, the waste hydrogen sulfide gas is very toxic and cannot be released into the atmosphere as it is. Therefore, it is necessary to discharge it after treating it with flare equipment (equipment that burns to reduce toxicity), abatement equipment using caustic soda, or the like.

  However, when the waste hydrogen sulfide gas is processed by the flare equipment, the hydrogen sulfide gas becomes SOx gas, which slightly affects the environment. On the other hand, when detoxifying with detoxification equipment, a neutralizing agent such as caustic soda is required, and the neutralizing agent must also be considered as an operating cost.

  For example, in Patent Document 1, hydrogen sulfide gas is absorbed by caustic soda as a method of recovering surplus hydrogen sulfide gas discharged from the sulfurization reaction tank in a sulfidation process in which nickel oxide ore is processed to produce MS. There has been proposed a method of reusing in a sulfidation reaction through a liquid (a form such as sodium hydrosulfide or sodium sulfide). Patent Document 2 discloses that hydrogen sulfide gas volatilized during the dehydration step is absorbed by an organic amide solvent outside the system in which the dehydration step is performed and recovered, and the recovered hydrogen sulfide is a raw material for the alkali metal sulfide. A method for reusing the polymerization reaction is disclosed.

  However, these methods are not methods for recovering hydrogen sulfide as a gas, and also require a recovery solvent such as caustic soda and organic amide.

JP 2010-126778 A Japanese Patent Application Laid-Open No. 09-286861

  The present invention has been proposed in view of such a situation, and recovers waste hydrogen sulfide gas discharged and efficiently supplies it to a processing plant for processing using hydrogen sulfide gas. Hydrogen sulfide gas production plant that can cool part of the sulfur supplied to the facility and supply it again to the reaction facility and sulfur treatment plant that uses sulfur, and the waste hydrogen sulfide gas produced by the hydrogen sulfide gas production plant It is to provide a collection and utilization method.

  As a result of intensive studies to achieve the above-described object, the present inventors collect waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant, and one end uses hydrogen sulfide gas. It has been found that by providing a pipe connected to the treatment plant, the discharged hydrogen sulfide gas can be efficiently recovered and effectively supplied to the treatment plant that uses the hydrogen sulfide gas.

  That is, the hydrogen sulfide gas production plant according to the present invention includes at least a reaction facility for generating hydrogen sulfide gas from sulfur and hydrogen gas, a plurality of cooling facilities for cooling the generated hydrogen sulfide gas, and the hydrogen sulfide gas. A hydrogen sulfide gas production plant comprising a sulfur removal facility that removes sulfur contained in the reactor and a sulfur cooling facility that cools a part of the sulfur supplied to the reaction facility, the sulfur sulfide generated in the cooling facility A pipe for collecting waste hydrogen sulfide gas discharged from a hydrogen gas production plant, one end of which is connected to a treatment plant using hydrogen sulfide gas, and supplying the collected waste hydrogen sulfide gas to the treatment plant, and the above-described sulfur cooling A route for supplying sulfur cooled in the facility to the reaction facility again using a circulation pump and / or to a sulfur treatment plant using sulfur. Characterized in that it comprises and.

  The method for recovering and using waste hydrogen sulfide gas according to the present invention includes at least a reaction facility for generating hydrogen sulfide gas from sulfur and hydrogen gas, a plurality of cooling facilities for cooling the generated hydrogen sulfide gas, and the sulfide Recovering waste hydrogen sulfide gas generated in a hydrogen sulfide gas production plant comprising a sulfur removal facility for removing sulfur contained in hydrogen gas and a sulfur cooling facility for cooling part of the sulfur supplied to the reaction facility. The hydrogen sulfide gas production plant includes a pipe for recovering waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant and having one end connected to a treatment plant using the hydrogen sulfide gas. The waste hydrogen sulfide gas discharged is recovered through the piping, and the waste hydrogen sulfide gas is supplied to the treatment plant and cooled by the sulfur cooling facility. Sulfur was again supplied to the reaction equipment by the circulation pump, and / or sulfur and the cooling, and supplying to the sulfur treatment plant using sulfur.

  According to the present invention, waste hydrogen sulfide gas that is discharged can be efficiently recovered without using a flare facility or an abatement facility, and can be effectively supplied to a processing plant that uses the hydrogen sulfide gas. Sulfur cooled in the sulfur cooling facility can be supplied to the reaction facility again and / or supplied to the sulfur treatment plant so that the sulfur can be effectively used.

It is a schematic block diagram which shows an example of a structure of a hydrogen sulfide gas manufacturing plant. It is a schematic block diagram which shows an example of a structure of a hydrogen sulfide gas manufacturing plant. It is a supply control flow figure at the time of supplying waste hydrogen sulfide gas to a processing plant. It is a supply control flow figure at the time of supplying waste hydrogen sulfide gas to a processing plant. It is a schematic block diagram which shows the structure of the conventional hydrogen sulfide gas manufacturing plant. It is a schematic block diagram which shows the structure of the conventional hydrogen sulfide gas manufacturing plant.

Hereinafter, the hydrogen sulfide gas production plant and the method of recovering and using waste hydrogen sulfide gas according to the present invention will be described in detail in the following order. Note that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the gist of the present invention.
1. 1. Outline of the present invention 2. Hydrogen sulfide gas production plant 2-1. First embodiment 2-2. Second Embodiment 3. 3. Recovery and utilization method of waste hydrogen sulfide gas 3-1. First embodiment 3-2. Second Embodiment 4. Example

[1. Outline of the present invention]
The hydrogen sulfide gas production plant according to the present invention is included in at least a reaction facility for generating hydrogen sulfide gas by sulfur and hydrogen gas, a plurality of cooling facilities for cooling the generated hydrogen sulfide gas, and hydrogen sulfide gas. A hydrogen sulfide gas production plant equipped with a sulfur removal facility for removing sulfur, recovering waste hydrogen sulfide gas generated in a cooling facility and discharged from the plant, one end of which is a treatment plant that uses hydrogen sulfide gas A pipe to be connected is provided. And in this invention, the waste hydrogen sulfide gas collect | recovered via the piping is supplied to the processing plant, It is characterized by the above-mentioned.

  In the hydrogen sulfide gas production plant, when the hydrogen sulfide gas generated in the reaction facility is cooled by the cooling facility, a part of the sulfur contained in the hydrogen sulfide gas is solidified and fixed to the bottom of the cooling facility. Resulting in. In order to prevent a decrease in cooling capacity and the resulting decrease in operational efficiency, multiple cooling facilities are provided and used alternately, and the fixed sulfur is internally removed from the cooling facilities that have been temporarily switched over. ing. At this time, waste hydrogen sulfide gas is generated when the sulfur is removed.

  Conventionally, the waste hydrogen sulfide gas generated from the plant is hardly utilized and has been a loss in hydrogen sulfide gas production. In addition, since it cannot be released into the atmosphere as it is, it was treated using flare equipment, abatement equipment, etc., but there was a considerable burden on the environment, and a neutralizing agent such as caustic soda had to be used separately.

  On the other hand, according to the hydrogen sulfide gas production plant and the method for recovering and using waste hydrogen sulfide gas using the plant according to the present invention, the exhausted hydrogen sulfide gas is efficiently recovered and the hydrogen sulfide gas is recovered. Can be supplied to a processing plant that uses and can be used effectively. In addition, since treatment using conventional flare equipment and abatement equipment is not required, the burden on the environment can be effectively reduced, and no neutralizer such as caustic soda is required, which is advantageous in terms of cost. It is.

  In addition, as a processing plant which uses hydrogen sulfide gas, the dezincification process plant used in the dezincification process in the hydrometallurgy method of nickel oxide ore, the sulfidation process plant used in a sulfidation process, etc. are mentioned, for example. .

  The nickel oxide ore wet smelting method is a hydrometallurgical method of recovering nickel and cobalt from a nickel oxide ore slurry using, for example, a high-temperature high-pressure leaching method (HPAL method). Specifically, this nickel oxide ore hydrometallurgical process consists of a leaching step of adding sulfuric acid to a nickel oxide ore slurry and leaching under high temperature and high pressure, and separating the residue while washing the leaching slurry in multiple stages to obtain nickel and cobalt. And a solid-liquid separation step for obtaining a leachate containing an impurity element, a neutralization step for adjusting the pH of the leachate to separate a neutralized starch containing an impurity element and obtaining a neutralization final solution containing zinc together with nickel and cobalt, A zinc removal process is performed by blowing hydrogen sulfide gas into the final neutralized solution to form zinc sulfide to separate and obtaining a nickel recovery mother liquor containing nickel and cobalt, and nickel sulfide by blowing hydrogen sulfide gas into the nickel recovery mother liquor. And a sulfidation step of forming a mixed sulfide containing cobalt.

  In the dezincification step and the sulfidation step in the nickel oxide ore hydrometallurgy method, metal sulfide is formed by blowing hydrogen sulfide gas into the gas phase of the reaction tank in each plant to cause a sulfidation reaction. Therefore, with respect to treatment plants that use these hydrogen sulfide gases, the hydrogen sulfide gas that has been conventionally disposed of as waste hydrogen sulfide gas is recovered along with the hydrogen sulfide gas that is normally produced from the hydrogen sulfide gas production plant. By supplying, the hydrogen sulfide gas manufactured in a hydrogen sulfide gas manufacturing plant can be supplied without loss. Moreover, in the processing plant which uses each hydrogen sulfide gas, it becomes possible to reduce the use cost of hydrogen sulfide gas, and can perform efficient hydrometallurgical operation.

  Hereinafter, specific embodiments relating to a hydrogen sulfide gas production plant and a method for recovering and using waste hydrogen sulfide gas according to the present invention will be described more specifically with reference to the drawings. Note that the hydrogen sulfide gas production plant according to the present embodiment is an improvement of the hydrogen sulfide gas production plant 60 shown in FIG. 6 described above, and a part of the description is omitted.

[2. Hydrogen sulfide gas production plant]
<2-1. First Embodiment>
FIG. 1 is a schematic diagram illustrating an example of a configuration of a hydrogen sulfide gas production plant. A hydrogen sulfide gas production plant 10 shown in FIG. 1 includes a reaction facility 11 for generating hydrogen sulfide gas, a plurality of cooling facilities 12 for cooling the generated hydrogen sulfide gas, and sulfur by removing sulfur in the hydrogen sulfide gas. And a sulfur removal facility 13 for supplying the hydrogen sulfide gas from which is removed. Moreover, the hydrogen sulfide gas production plant 10 collects the waste hydrogen sulfide gas generated in the cooling facility 12 and discharged from the plant 10, and has a pipe 14 connected at one end to the processing plant A using the hydrogen sulfide gas. I have.

  Furthermore, the hydrogen sulfide gas production plant 10 collects and stores the sulfur removed by the sulfur removal equipment 13 and adjusts the heat balance in the blowdown equipment 15 that supplies the sulfur treatment equipment and the reaction equipment 11. Therefore, a sulfur cooling facility 16 for cooling sulfur is provided.

  The reaction facility 11 includes, for example, a reactor 17, a quench tower 18, and a heater 19. The reaction facility 11 generates a hydrogen sulfide gas generation reaction by the supplied sulfur and hydrogen gas, and generates hydrogen sulfide gas. More specifically, the molten sulfur is stored in the reactor 17 and hydrogen gas is supplied from the lower part thereof, so that the reaction proceeds while the rising flow of the hydrogen gas passes through the molten sulfur, and the hydrogen sulfide gas is generated. Occur. Most of the hydrogen sulfide gas generated here is hydrogen sulfide, but part of it contains sulfur vapor that is entrained when the hydrogen gas passes through the reactor 17.

  The reaction facility 11 is operated under relatively high temperature and high pressure conditions of a temperature of about 470 ° C. and a pressure of about 800 kPaG, and the generated hydrogen sulfide gas is also at a high temperature and pressure. The hydrogen sulfide gas generated in the reaction facility 11 is about 150 ° C. when passing through the quench tower 18 as a result of heat exchange with the supplied sulfur.

  The cooling facility 12 collects hydrogen sulfide gas generated in the reaction facility 11. The cooling temperature of the hydrogen sulfide gas in the cooling facility 12 is not particularly limited, and is preferably lower in order to reduce the sulfur content in the hydrogen sulfide gas. Specifically, since normal (cooling) water is used, it is cooled to about 50 ° C.

  The hydrogen sulfide gas production plant 10 includes a plurality of cooling facilities 12. In the cooling facility 12, a part of the sulfur contained in the recovered hydrogen sulfide gas is solidified and fixed inside the facility (heat transfer surface). For this reason, by providing a plurality of cooling facilities 12, they can be used by alternately switching them to prevent a decrease in operating efficiency due to a decrease in cooling capacity. The hydrogen sulfide gas production plant 10 shown in FIG. 1 is an example having two systems of cooling facilities 12A and 12B.

  Further, in the cooling facilities 12A and 12B, for example, a jacket is provided around the lower portion thereof, and the fixed sulfur can be melted by heating with steam. In the cooling facilities 12A and 12B, for example, when sulfur is fixed inside the cooling facility 12A, the use of the cooling facility 12A is stopped and switched to the cooling facility 12B. In the cooling facility 12A whose use has been stopped, sulfur fixed by steam is melted and recovered.

  Here, since the cooling facilities 12A and 12B cool the hydrogen sulfide gas until just before the facilities whose use has been temporarily stopped, the high-pressure and high-concentration hydrogen sulfide gas is held therein. Therefore, in the melt recovery process of sulfur fixed inside, it is necessary to discharge the hydrogen sulfide gas in the cooling facilities 12A and 12B for melting and recovering the sulfur and reduce the internal pressure. In the hydrogen sulfide gas production plant 10, the hydrogen sulfide gas discharged at this time becomes so-called waste hydrogen sulfide gas, which is generated in the cooling facilities 12A and 12B.

  As a discharge aspect of the waste hydrogen sulfide gas from the hydrogen sulfide gas production plant 10, for example, the waste hydrogen sulfide gas is discharged to the blowdown facility 15 described later together with the sulfur melted and recovered in the cooling facilities 12 </ b> A and 12 </ b> B. And is discharged from the discharge port 25 provided in the blow-down facility 15. Alternatively, the waste hydrogen sulfide gas generated in the cooling facilities 12A and 12B may be directly discharged from the discharge ports provided in the cooling facilities 12A and 12B.

  In addition, when discharging | emitting waste hydrogen sulfide gas from the discharge port 25 provided in the blowdown facility 15, as shown in FIG. 1, the discharge port 25 of the blowdown facility 15 and the processing plant A using hydrogen sulfide gas are connected. A pipe 14 to be described later is provided so as to be connected. Further, when the waste hydrogen sulfide gas is directly discharged from the discharge ports provided in the cooling facilities 12A and 12B, the discharge ports of the cooling facilities 12A and 12B and the processing plant A using the hydrogen sulfide gas are connected. A pipe 14 to be described later is provided.

  The sulfur removal facility (knockout facility) 13 removes sulfur in the hydrogen sulfide gas cooled by the cooling facilities 12A and 12B. The sulfur removal facility 13 supplies the hydrogen sulfide gas from which sulfur has been removed to a processing plant or the like that uses the hydrogen sulfide gas. As described above, the hydrogen sulfide gas generated in the reaction facility 11 partially contains sulfur vapor. In the sulfur removal equipment 13, the sulfur vapor is solidified and deposited on the bottom, and is melted and recovered by, for example, heating with steam through a jacket installed in the outer periphery of the lower part. The recovered sulfur is transferred to a blowdown facility 15 described later.

  In addition, as a processing plant which the sulfur removal equipment 13 supplies hydrogen sulfide gas, it may be the same as the processing plant A which supplies waste hydrogen sulfide gas via the piping 14 mentioned later, or may differ. For example, examples of the treatment plant include a sulfidation process plant and a dezincification process plant used in a hydrometallurgy method of nickel oxide ore.

  The pipe 14 collects the waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant 10 and one end thereof is connected to the processing plant A that uses the hydrogen sulfide gas. As described above, the waste hydrogen sulfide gas recovered by the pipe 14 is the hydrogen sulfide gas discharged during the melting recovery process of the sulfur fixed in the cooling facilities 12A and 12B. This waste hydrogen sulfide gas is also a high-pressure gas of about 780 kPaG.

  For example, as shown in FIG. 1, the pipe 14 connects an outlet 25 of a blow-down facility 15 described later and a processing plant A that uses hydrogen sulfide gas. The pipe 14 collects the waste hydrogen sulfide gas generated in the cooling facilities 12 </ b> A and 12 </ b> B and discharged to the blow-down facility 15 through the discharge port 25 of the blow-down facility 15 in order to perform the sulfur melt recovery process. The recovered waste hydrogen sulfide gas passes through the pipe 14 and is supplied to the processing plant A that uses the hydrogen sulfide gas to which one end of the pipe 14 is connected.

  The pipe 14 has a pressure gauge 20 for measuring the pressure of the waste hydrogen sulfide gas supplied to the processing plant A using the hydrogen sulfide gas, and a flow rate for measuring the flow rate of the waste hydrogen sulfide gas. A total of 21 is provided. Further, the pipe 14 is provided with a control valve 22 for controlling the supply of recovered waste hydrogen sulfide gas to the processing plant A. Thus, in the pipe 14, by providing at least the pressure gauge 20 and the control valve 22, by controlling the control valve 22 according to the pressure of the waste hydrogen sulfide gas measured by the pressure gauge 20, The waste hydrogen sulfide gas can be appropriately supplied to the processing plant A. Details will be described later.

  Further, the pipe 14 is provided with at least one ON / OFF valve 23 for isolating waste hydrogen sulfide gas between the hydrogen sulfide gas production plant 10 and the plant using hydrogen sulfide gas in an emergency. It is possible.

  In addition, it does not specifically limit as the processing plant A which supplies waste hydrogen sulfide gas via the piping 14, What is necessary is just a processing plant which uses hydrogen sulfide gas. For example, a sulfidation process plant or a dezincification process plant used in the above-described method for hydrometallizing nickel oxide ore can be used. In the treatment plant A, the operating pressure of the hydrogen sulfide gas is lower than the operating pressure condition (780 to 800 kPaG) in the reaction equipment 11 of the plant 10. It is preferable in that waste hydrogen sulfide gas can be supplied.

  The blow-down facility 15 recovers sulfur removed from the hydrogen sulfide gas by the sulfur removal facility 13. Moreover, the blowdown facility 15 collects sulfur that has adhered to the cooling facilities 12A and 12B. The blow-down facility 15 supplies the recovered sulfur to, for example, a sulfur treatment plant using the supply pump 24. Alternatively, the recovered sulfur may be recycled as a sulfur source to be supplied to the reaction facility 11 again.

  Further, the blow-down facility 15 is provided with a discharge port 25 for discharging waste hydrogen sulfide gas generated in the cooling facilities 12A and 12B and discharged to the blow-down facility 15 out of the system. As shown in FIG. 1, the blow-down facility 15 is connected to a processing plant A that uses hydrogen sulfide gas by connecting a pipe 14 to the discharge port 25, and waste discharged from the discharge port 25. Hydrogen sulfide gas is recovered via the pipe 14 and supplied to the processing plant A.

  The sulfur cooling facility 16 cools sulfur from about 470 ° C. to about 150 ° C. in order to adjust the heat balance in the reaction facility 11. In addition, the sulfur cooling facility 16 supplies the cooled sulfur to, for example, the blowdown facility 15 and supplies it to the sulfur treatment plant and the like together with the sulfur recovered from the cooling facilities 12A and 12B and the sulfur removal facility 13. Further, the sulfur cooling facility 16 may circulate and use the cooled sulfur as a sulfur source to be supplied to the reaction facility 11 again using the circulation pump 26.

  As described above, the hydrogen sulfide gas production plant 10 collects the waste hydrogen sulfide gas generated in the cooling facilities 12A and 12B and discharged from the plant 10, and one end is connected to the processing plant A using the hydrogen sulfide gas. The piping 14 is provided. Since this piping 14 can supply the waste hydrogen sulfide gas discharged from the plant 10 to the processing plant A, the waste hydrogen sulfide gas that has been lost until now can be efficiently removed. It can be recovered and used effectively in the processing plant A. In addition, since the processing by the flare equipment or the abatement equipment is not required as in the prior art, the use cost of the recovered solvent such as caustic soda can be eliminated, and the operation cost can be greatly reduced.

  In addition, at least the pressure gauge 20 for measuring the pressure of the waste hydrogen sulfide gas and the control valve 22 for controlling the supply of the waste hydrogen sulfide gas to the processing plant A are appropriately disposed in the pipe 14. The recovered waste hydrogen sulfide gas can be efficiently supplied to the treatment plant A according to the measured pressure. Further, as shown in FIG. 1, a flow meter 21 for measuring the flow rate of waste hydrogen sulfide gas is installed in the pipe 14 to efficiently supply the treatment plant A even in accordance with the flow rate of waste hydrogen sulfide gas. can do.

<2-2. Second Embodiment>
In the hydrogen sulfide gas production plant 10 shown in FIG. 1 described above, one end of a pipe 14 is connected to one processing plant A, and waste hydrogen sulfide gas can be supplied to the one processing plant A through the pipe 14. Although the example has been described, the present invention is not limited to this, and the pipe 14 may be configured so that the waste hydrogen sulfide gas can be supplied to a plurality of processing plants.

  FIG. 2 is a configuration diagram of a hydrogen sulfide gas production plant 10 ′ configured to be able to supply waste hydrogen sulfide gas to two processing plants (processing plant A and processing plant B) that use hydrogen sulfide gas. In the hydrogen sulfide gas production plant 10 ′ shown in FIG. 2, the same components as those in the hydrogen sulfide gas production plant 10 shown in FIG.

  The hydrogen sulfide gas production plant 10 ′ includes a reaction facility 11, a cooling facility 12, a sulfur removal facility 13, a blowdown facility 15, and a sulfur cooling facility 16. A waste hydrogen sulfide gas generated in the cooling facility 12 and discharged from the hydrogen sulfide gas production plant 10 ′ is recovered, and one end of the pipe 14 ′ is connected to a processing plant using the hydrogen sulfide gas. .

  In the hydrogen sulfide gas production plant 10 ′, the pipe 14 ′ is a branch pipe branched at a predetermined branch point 30, and hydrogen sulfide gas is used for the two pipes 14 A and 14 B formed by branching. Each of the two processing plants (processing plant A and processing plant B) can be connected. Further, in the pipes 14A and 14B, there are respectively pressure gauges 20A and 20B for measuring the pressure of the supplied waste hydrogen sulfide gas and flow meters 21A and 21B for measuring the flow rate of the waste hydrogen sulfide gas. It is provided on the processing plants A and B side with respect to the branch point 30. Furthermore, control valves 22A and 22B for controlling the supply of waste hydrogen sulfide gas to be supplied to the processing plant A and the processing plant B are provided in the pipes 14A and 14B, respectively. Furthermore, the pipes 14A and 14B are provided with at least one ON / OFF valve 23A and 23B, respectively, between the hydrogen sulfide gas production plant 10 ′ in emergency and the plant using hydrogen sulfide gas. This makes it possible to isolate waste hydrogen sulfide gas.

  As described above, the pressure gauges 20A and 20B for measuring the pressure of the waste hydrogen sulfide gas supplied to the processing plants A and B at least in the pipes 14A and 14B formed in the pipe 14 ′ are branched. In addition, control valves 22A and 22B for controlling the supply of waste hydrogen sulfide gas are provided. As a result, waste hydrogen sulfide gas having different pressures can be supplied to the processing plant A and the processing plant B. In other words, the waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant 10 ′ can be appropriately supplied to a plurality of processing plants having different usage applications and usage conditions of the hydrogen sulfide gas.

  Specifically, as treatment plant A and treatment plant B for supplying waste hydrogen sulfide gas, for example, a dezincification process plant in a dezincification process of a wet smelting method of nickel oxide ore, and a sulfidation process plant in a sulfidation process Can be mentioned. In the dezincification step and the sulfidation step in this hydrometallurgical method, the generation of metal sulfide is adjusted by changing the pressure conditions and the like into which hydrogen sulfide gas is blown. That is, first, zinc is preferentially recovered as zinc sulfide by blowing relatively low-pressure hydrogen sulfide gas into a solution obtained by leaching and neutralizing nickel oxide ore in the zinc removal step. Then, in the sulfiding step, a mixed sulfide containing nickel and cobalt is generated and recovered by blowing a relatively high-pressure hydrogen sulfide gas into the obtained zinc-removed solution.

  Thus, the desulfurization process plant and the sulfidation process plant differ in the pressure conditions of the hydrogen sulfide gas used. More specifically, the dezincification process plant is operated under a pressure condition of 2 kPaG corresponding to 1/100 or less of the operation pressure condition in the reaction equipment 11 of the hydrogen sulfide gas production plant 10 ′. The operation is performed under a pressure condition of 280 kPaG corresponding to 1/2 or less of the operation pressure condition in the facility 11.

  As described above, according to the hydrogen sulfide gas production plant 10 ′, the pressure gauges 20A and 20B and the control valves 22A and 22B are appropriately disposed in the pipes 14A and 14B, so that the waste hydrogen sulfide gas is supplied. Even when the pressure conditions of the hydrogen sulfide gas used between the plurality of processing plants A and B differ greatly, the supply can be appropriately controlled, and the processing plants A and B can be used effectively. Specific supply control of waste hydrogen sulfide gas will be described later.

  As described above, also in the hydrogen sulfide gas production plant 10 ′, the plant 10 ′ and the processing plants A and B using the hydrogen sulfide gas are connected by the pipe 14 ′, and the pipe 14 ′ is a predetermined branch point. The branch pipes (14A, 14B) branch off at. Thereby, the waste hydrogen sulfide gas discharged from the plant 10 ′ can be efficiently recovered, and the recovered waste hydrogen sulfide gas is recovered from the plurality of processing plants A and B connected by the pipe 14 ′. It can be supplied effectively.

  Also in the pipe 14 ′, pressure gauges 20A and 20B for measuring the pressure of the waste hydrogen sulfide gas and control valves 22A and 22B for controlling the supply thereof are appropriately provided for the pipes 14A and 14B formed by branching. Therefore, waste hydrogen sulfide gas can be efficiently supplied, and waste hydrogen sulfide gas having different pressures can be supplied to the plurality of processing plants A and B. Thereby, the waste hydrogen sulfide gas having a pressure that matches the use conditions of the hydrogen sulfide gas can be appropriately supplied to each of the processing plants A and B.

[3. How to recover and use waste hydrogen sulfide gas]
Next, a method for recovering and using waste hydrogen sulfide gas generated in the above-described hydrogen sulfide gas production plant 10, 10 ′ will be described.

<3-1. First Embodiment>
First, a method for recovering and using waste hydrogen sulfide gas in the hydrogen sulfide gas production plant 10 will be described. As described above, the hydrogen sulfide gas production plant 10 is provided with the pipe 14 that recovers the waste hydrogen sulfide gas discharged from the plant 10 and that is connected at one end to the processing plant A that uses the hydrogen sulfide gas. . In the method for recovering and using waste hydrogen sulfide gas in the hydrogen sulfide gas production plant 10, the exhausted waste hydrogen sulfide gas is recovered via the pipe 14, and the waste hydrogen sulfide gas is supplied to the processing plant A.

  As described above, the reaction equipment 11 in the hydrogen sulfide gas production plant 10 is operated under conditions of a high temperature of about 470 ° C. and a high pressure of about 800 kPaG, and the waste hydrogen sulfide gas generated in the cooling equipment 12A and 12B is also It is a high-pressure gas of about 780 kPaG. On the other hand, the operating pressure condition of the hydrogen sulfide gas in the processing plant A that is the supply destination of the recovered waste hydrogen sulfide gas is lower than the pressure of the generated waste hydrogen sulfide gas. Therefore, by providing the pipe 14, waste hydrogen sulfide gas discharged from the plant 10 is efficiently recovered due to the pressure difference, and can be transferred to the processing plant A to which the pipe 14 is connected.

  Here, the use conditions of the hydrogen sulfide gas such as pressure and flow rate are often different depending on the treatment plant supplying the waste hydrogen sulfide gas. Therefore, when supplying the waste hydrogen sulfide gas to the processing plant A through the pipe 14, it is more preferable to appropriately supply the waste hydrogen sulfide gas by performing the following supply control of the waste hydrogen sulfide gas.

  Specifically, FIG. 3 shows a flow of supply control when the waste hydrogen sulfide gas is recovered through the pipe 14 in the hydrogen sulfide gas production plant 10 and the recovered waste hydrogen sulfide gas is supplied to the processing plant A. .

  First, in step S11, waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant 10 via the pipe 14 is recovered. Specifically, the waste hydrogen sulfide gas generated in the cooling facilities 12 </ b> A and 12 </ b> B and discharged from the discharge port 25 of the blow-down facility 15 is recovered via the pipe 14.

  Next, in step S12, the control valve 22 provided in the pipe 14 is opened.

  Subsequently, in step S13, supply of the recovered waste hydrogen sulfide gas to the processing plant A is started via the pipe 14 by opening the control valve 22 and the ON / OFF valve 23 in step S12.

  Next, in step S14, the pressure gauge 20 provided in the pipe 14 is monitored, and the pressure of the waste hydrogen sulfide gas flowing through the pipe 14 and supplied to the processing plant A is measured.

  Then, in step S15, it is determined whether or not the pressure measured by the pressure gauge 20 has dropped and the measured pressure has hardly changed. That is, it is determined whether or not the measured pressure is reduced to be equal to the pressure in the processing plant A to be supplied, and the waste hydrogen sulfide gas is no longer flowing into the processing plant A. If it is determined in step S15 that there is almost no change (in the case of Yes), the process proceeds to step S16. On the other hand, when it is determined that there is still a change (in the case of No), the process returns to step S13 and the supply of waste hydrogen sulfide gas to the processing plant A is continued.

  In step S16, the control valve 22 and the ON / OFF valve 23 are closed because there is almost no change in the pressure of the waste hydrogen sulfide gas to be supplied, that is, the waste hydrogen sulfide gas is no longer flowing into the processing plant A. Thereby, waste hydrogen sulfide gas is prevented from flowing back into the hydrogen sulfide gas production plant 10.

  In step S17, the supply of waste hydrogen sulfide gas to the processing plant A is stopped by closing the control valve 22 and the ON / OFF valve 23 in step S16.

  In the hydrogen sulfide gas production plant 10, when the recovered waste hydrogen sulfide gas is supplied to the processing plant A, the above-described supply control is performed, so that the waste is more efficiently matched to the use conditions in the processing plant A. Hydrogen sulfide gas can be supplied appropriately.

<3-2. Second Embodiment>
Next, a method for recovering and using waste hydrogen sulfide gas in the hydrogen sulfide gas production plant 10 ′ described above will be described. The hydrogen sulfide gas production plant 10 ′ is provided with a pipe 14 ′ that collects waste hydrogen sulfide gas discharged from the plant 10 ′ and is connected at one end to a processing plant that uses the hydrogen sulfide gas. The pipe 14 'is a branch pipe branched at a predetermined location, and is branched into pipes 14A and 14B. In the method for recovering and using waste hydrogen sulfide gas in the hydrogen sulfide gas production plant 10 ', the discharged waste hydrogen sulfide gas is recovered through the pipe 14', and the recovered waste hydrogen sulfide gas is supplied to the pipe 14A, Supply to processing plant A and processing plant B via 14B.

  A plurality of processing plants (processing plant A and processing plant B) connected via the pipe 14 'in the hydrogen sulfide gas production plant 10' are assumed to have different use pressure conditions for the hydrogen sulfide gas. In that case, the waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant 10 ′ is recovered in a short time, and the recovered waste hydrogen sulfide gas is appropriately and efficiently supplied, which is preferable in the processing plants A and B. It is necessary to be effectively used in the embodiment. Hereinafter, the processing plant A (for example, a sulfidation process plant) is a processing plant in which hydrogen sulfide gas is used at a relatively high pressure, and the processing plant B (for example, a dezincification process plant) has a relatively low pressure. The processing plant uses hydrogen sulfide gas.

  Therefore, in supplying waste hydrogen sulfide gas to a plurality of treatment plants using different pressure conditions using hydrogen sulfide gas, first, waste hydrogen sulfide is supplied to treatment plant A having a relatively high pressure condition. Supply gas. Subsequently, waste hydrogen sulfide gas is supplied to the processing plant B having a relatively low pressure condition.

  Thereby, transfer of the waste hydrogen sulfide gas to each processing plant A and B is completed in a short time, and waste hydrogen sulfide gas can be supplied effectively. That is, by first supplying waste hydrogen sulfide gas to the treatment plant A, the pressure of the waste hydrogen sulfide gas in the pipe 14 ′ decreases with time, and approximates the pressure condition in the treatment plant B. be able to. Then, by starting the supply to the treatment plant B after the supply to the treatment plant A, it is possible to immediately supply the waste hydrogen sulfide gas having an appropriate pressure to the treatment plant B, and for a long time until the pressure decreases. It is not necessary to take measures such as leaving it unattended. Therefore, it can supply effectively also in terms of safety.

  In the cooling facilities 12A and 12B in the hydrogen sulfide gas production plant 10 ', for example, the time for melting the sulfur fixed to the jacket through steam, the time for recovering the molten sulfur, and the interior of the facility again after recovering the molten sulfur. Time for cooling and shifting to the standby state is required. For this reason, it is desirable to efficiently supply waste hydrogen sulfide gas to the processing plant as much as possible so that the waste hydrogen sulfide gas can be recovered again in a short time. Also in this respect, as described above, since the supply of the waste hydrogen sulfide gas can be efficiently completed, the recovery of the waste hydrogen sulfide gas via the pipe 14 'can be performed in a short time, and Efficiency can be improved.

  More specifically, in the hydrogen sulfide gas production plant 10 ′, the processing plants A and B are connected via the pipes 14 ′ (14A, 14B) to different processing pressures A and B of the hydrogen sulfide gas. Supply control when supplying waste hydrogen sulfide gas to B will be described based on the flow shown in FIG.

  First, in step S21, waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant 10 'through the pipe 14' is recovered. Specifically, the waste hydrogen sulfide gas generated in the cooling facilities 12A and 12B and discharged from the discharge port 25 of the blow-down facility 15 is recovered through the pipe 14 '.

  Next, in step S22, the control valve 22A and the ON / OFF valve 23A that are provided in the pipe 14A and control the supply of the waste hydrogen sulfide gas to the processing plant A are opened, and the pipe 14B is provided to the processing plant B. The control valve 22B and the ON / OFF valve 23B for controlling the supply of the waste hydrogen sulfide gas are closed. Subsequently, in step S23, supply of the recovered waste hydrogen sulfide gas to the processing plant A is started via the pipe 14A by opening the control valve 22A and the ON / OFF valve 23A in step S22.

  Next, in step S24, the pressure gauge 20A provided in the pipe 14A is monitored, and the pressure of the waste hydrogen sulfide gas flowing through the pipe 14A and supplied to the processing plant A is measured.

  Then, in step S25, it is determined whether or not the pressure measured by the pressure gauge 20A has dropped and the measured pressure has almost no change. That is, it is determined whether or not the measured pressure is reduced to be equal to the pressure in the processing plant A to be supplied, and the waste hydrogen sulfide gas is no longer flowing into the processing plant A. If it is determined in step S25 that there is almost no change (in the case of Yes), the process proceeds to step S26. On the other hand, when it is determined that there is still a change (in the case of No), the process returns to step S23 and the supply of waste hydrogen sulfide gas to the processing plant A is continued.

  In step S26, since there is almost no pressure change of the waste hydrogen sulfide gas to be supplied, that is, the waste hydrogen sulfide gas is no longer flowing into the processing plant A, the control valve 22A provided on the pipe 14A and the ON / OFF The valve 23A is closed, and the supply of waste hydrogen sulfide gas to the processing plant A is stopped.

  In step S27, the control valve 22B and the ON / OFF valve 23B provided in the pipe 14B are opened, and supply of waste hydrogen sulfide gas to the processing plant B via the pipe 14B is started.

  Next, in step S28, the pressure gauge 20B provided in the pipe 14B is monitored, and the pressure of the waste hydrogen sulfide gas flowing through the pipe 14B and supplied to the processing plant B is measured.

  Then, in step S29, it is determined whether or not the pressure measured by the pressure gauge 20B has dropped and the measured pressure has almost no change. That is, it is determined whether or not the measured pressure is reduced to be equal to the pressure in the processing plant B to be supplied, and the waste hydrogen sulfide gas is no longer flowing into the processing plant B. If it is determined in step S29 that there is almost no change (in the case of Yes), the process proceeds to step S30. On the other hand, when it is determined that there is still a change (in the case of No), the process returns to step S27 and the supply of waste hydrogen sulfide gas to the processing plant B is continued.

  In step S30, since there is almost no pressure change of the waste hydrogen sulfide gas to be supplied, that is, the waste hydrogen sulfide gas is no longer flowed into the processing plant B, the control valve 22B provided in the pipe 14B is turned on. The / OFF valve 23B is closed, and the supply of waste hydrogen sulfide gas to the processing plant B is stopped.

  In the hydrogen sulfide gas production plant 10 ′, when the recovered waste hydrogen sulfide gas is supplied to the processing plants A and B, the above supply control is performed, whereby the pressure condition of the hydrogen sulfide gas used in each processing plant. Even if they are different from each other, it is possible to appropriately supply waste hydrogen sulfide gas that efficiently meets the use conditions in each processing plant.

  In the above description, supply control to a plurality of processing plants having different pressure conditions to be used has been described. However, an appropriate flow rate can be efficiently supplied to a plurality of processing plants having different amounts of hydrogen sulfide gas to be used. can do.

  Specifically, for example, when the amount of hydrogen sulfide gas used in the dezincification process of the hydrometallurgical method of nickel oxide ore is compared with that in the sulfidation process, the use amount in the dezincification process is far greater. Very few. For this reason, the time required for the processing inevitably increases.

  As described above, even if the conditions regarding the amount of hydrogen sulfide gas used in the plurality of processing plants A and B supplying the waste hydrogen sulfide gas are different, the waste hydrogen sulfide gas produced by the hydrogen sulfide gas production plant 10 ′ described above is used. According to the recovery and utilization method, waste hydrogen sulfide gas can be efficiently recovered and supplied. As a specific method, the control may be performed based on the flow rate of the waste hydrogen sulfide gas measured by the flow meters 21A and 21B provided in the pipes 14A and 14B, respectively. As a result, efficient operation can be performed without causing a problem that the processing time in each processing plant is extended, and the generated hydrogen sulfide gas can be effectively used without waste.

[4. Example]
Examples of the present invention will be described below, but the present invention is not limited to the following examples.

Example 1
As Example 1, the hydrogen sulfide gas production plant 10 ′ shown in FIG. 2 is used to perform a normal operation for producing hydrogen sulfide gas, and the waste hydrogen sulfide gas discharged from the plant 10 ′ is recovered. The operation | work which supplies the collect | recovered waste hydrogen sulfide gas to the sulfidation process plant (processing plant A) and the dezincification process plant (processing plant B) in the hydrometallurgy method of nickel oxide ore was performed.

  In normal operation in the hydrogen sulfide gas production plant 10 ′, in the cooling facilities 12A and 12B, a part of sulfur contained in the hydrogen sulfide gas is fixed to the bottom as the hydrogen sulfide gas is cooled. , 12B are used alternately. And about the cooling equipment of the temporarily stopped, the process which melt | dissolves and collect | recovers the fixed sulfur was performed. The hydrogen sulfide gas released during the sulfur melting treatment was used as waste hydrogen sulfide gas.

  Specifically, in the hydrogen sulfide gas production plant 10 ′, a pipe 14 ′ for connecting the discharge port 25 of the blow-down facility 15 and the nickel sulfide treatment plant and the dezincification treatment plant in the nickel oxide ore wet smelting plant is provided. installed. The pipe 14 ′ can be connected to a sulfidation process plant and a dezincification process plant by branching at a predetermined location.

  Further, in the pipe 14 ′, pressure gauges 20A and 20B for measuring the pressure of the waste hydrogen sulfide gas and flow meters 21A and 21B for measuring the flow rate are installed in the pipes formed by branching at the predetermined branch point. did. In addition, control valves 22A and 22B for controlling the supply of waste hydrogen sulfide gas were installed on the side of each processing plant with respect to the pressure gauges 20A and 20B and the flow meters 21A and 21B. Further, ON / OFF valves 23A and 23B for the purpose of emergency isolation were installed in the piping immediately after the branch point.

  In the hydrogen sulfide gas production plant 10 ′ having the above configuration, the recovery and supply of the waste hydrogen sulfide gas is generated in the cooling facilities 12 </ b> A and 12 </ b> B, discharged to the blowdown facility 15, and discharged from the blowdown facility 15. The waste hydrogen sulfide gas was recovered in the pipe 14 ', and the recovered waste hydrogen sulfide gas was supplied to the dezincification process plant and the sulfurization process plant via the pipe 14'.

  Note that the operating pressure condition in the reaction equipment 11 of the hydrogen sulfide gas production plant 10 ′ was 780 kPag as a daily average value although there was some variation. On the other hand, the pressure condition in the nickel sulfide treatment plant to which hydrogen sulfide gas was supplied was 280 kPag, and the pressure condition in the dezincification sulfurization plant was 2 kPag.

  Regarding the supply control of the waste hydrogen sulfide gas to each processing plant, first, the control valve 22A of the pipe 14 'is opened and the control valve 22B is closed, and the waste hydrogen sulfide gas recovered from the blowdown facility 15 (780 kPag). Was supplied to a nickel sulfide treatment plant. And when the pressure measured with the pressure gauge 20A became about 350 kPaG, the change in the pressure almost disappeared, so the control valve 22A was closed. At the same time, the valve for opening the control valve 22B was switched, and the remaining waste hydrogen sulfide gas in the pipe 14 'was supplied to the dezincification and sulfurization treatment plant. The supply to the dezincification sulfidation treatment plant was terminated when the pressure measured by the pressure gauge 20B reached about 50 kPaG because the change in the pressure almost disappeared. By repeating such operations, the operation was carried out for 6 months.

  As a result of the above operations, the cooling facilities 12A and 12B are switched to each other for a total of 1488 times during the operation period, and a total of 15t of waste hydrogen sulfide gas generated by the melting and recovery process of sulfur in the cooling facilities 12A and 12B The waste hydrogen sulfide gas could be effectively supplied to the nickel sulfide treatment plant and the dezincification treatment plant.

  At the same time, about 15 t of waste hydrogen sulfide gas can be recovered and supplied, so that about 14.1 t of sulfur and about 0.1% of hydrogen (methanol) are used as raw material operating materials corresponding to the production of 15 t of hydrogen sulfide gas. 9t was saved. Moreover, caustic soda for absorbing and removing hydrogen sulfide gas as a processing system material for treating waste hydrogen sulfide gas that has been conventionally used is no longer required for about 17.5 t. In addition, the conventional process of removing the waste hydrogen sulfide gas into the atmosphere after detoxifying it with the flare facility is no longer necessary, so there was no burden on the environment.

(Comparative Example 1)
In Comparative Example 1, operation was performed using a conventional hydrogen sulfide gas production plant.

  As a result, about 15 tons of waste hydrogen sulfide gas generated in the cooling facility was not collected, and it was necessary to dispose of it by the abatement facility. Then, about 17.5 t of caustic soda for absorbing and detoxifying waste hydrogen sulfide gas is required for the treatment by the detoxification equipment. Further, as compared with Example 1, about 14.1 t of sulfur and about 0.9 t of hydrogen were required as raw material-based operation materials. Even when the waste hydrogen sulfide gas is processed in the flare equipment, the generated sulfur oxide (SOx) has a possibility of being released to the atmosphere.

  10, 10 'hydrogen sulfide gas production plant, 11 reaction equipment, 12, 12A, 12B cooling equipment, 13 sulfur removal equipment, 14, 14', 14A, 14B piping, 15 blowdown equipment, 16 sulfur cooling equipment, 17 reactor, 18 quench tower, 19 heater, 20, 20A, 20B pressure gauge, 21, 21A, 21B flow meter, 22, 22A, 22B control valve, 23, 23A, 23B ON / OFF valve, 24 supply pump, 25 outlet, 26 Circulation pump, 30 branch points

Claims (15)

At least a reaction facility for generating hydrogen sulfide gas from sulfur and hydrogen gas, a plurality of cooling facilities for cooling the generated hydrogen sulfide gas, a sulfur removal facility for removing sulfur contained in the hydrogen sulfide gas, and A hydrogen sulfide gas production plant comprising a sulfur cooling facility for cooling part of the sulfur supplied to the reaction facility,
The waste hydrogen sulfide gas generated in the cooling facility and discharged from the hydrogen sulfide gas production plant is recovered, and one end is connected to a treatment plant using the hydrogen sulfide gas, and the recovered waste hydrogen sulfide gas is recovered from the treatment plant. Piping to supply to,
A hydrogen sulfide comprising: a route for supplying sulfur cooled in the sulfur cooling facility to the reaction facility again using a circulation pump; and / or a route for supplying to the sulfur treatment plant using sulfur Gas production plant.   2. The hydrogen sulfide gas production plant according to claim 1, wherein a pressure gauge for measuring the pressure of the waste hydrogen sulfide gas is provided in the pipe.   The hydrogen sulfide gas production plant according to claim 2, wherein a control valve for controlling the supply of the waste hydrogen sulfide gas is provided in the pipe on the processing plant side of the pressure gauge.   The pipe is branched at a predetermined branch point and is a branch pipe that can be connected to a plurality of processing plants using hydrogen sulfide gas. The pressure gauge and the control valve are connected to the plurality of pipes from the branch point. The hydrogen sulfide gas production plant according to claim 3, wherein the hydrogen sulfide gas production plant is provided in each pipe on the processing plant side.   The hydrogen sulfide gas production plant according to claim 4, wherein waste hydrogen sulfide gas having different pressures is supplied to the plurality of processing plants.   6. The plurality of treatment plants are a dezincification process plant for forming zinc sulfide and a sulfidation process plant for forming nickel and cobalt mixed sulfide in a hydrometallurgy method of nickel oxide ore. Hydrogen sulfide gas production plant.   The pressure of the hydrogen sulfide gas used in the dezincification process plant is 1/100 or less of the pressure in the reaction facility, and the pressure of the hydrogen sulfide gas used in the sulfidation process plant is equal to the pressure in the reaction facility. The hydrogen sulfide gas production plant according to claim 6, which is ½ or less. The cooling facility has a discharge port for discharging the waste hydrogen sulfide gas,
The said piping connects the discharge port of the said cooling equipment, and the said processing plant, collect | recovers the waste hydrogen sulfide gas discharged | emitted from this cooling equipment, and supplies it to this processing plant. The hydrogen sulfide gas production plant according to any one of the above. The hydrogen sulfide gas production plant further includes a blowdown facility for recovering sulfur fixed in the cooling facility and sulfur removed by the sulfur removal facility,
The blowdown facility has a discharge port for recovering waste hydrogen sulfide gas generated and released from the cooling facility and discharging the waste hydrogen sulfide gas.
The said piping connects the discharge port of the said blowdown facility, and the said processing plant, collect | recovers the waste hydrogen sulfide gas discharged | emitted from this blowdown facility, and supplies it to this processing plant. 8. The hydrogen sulfide gas production plant according to any one of 7 above.   The hydrogen sulfide gas production plant according to any one of claims 1 to 9, wherein an operating temperature condition in the reaction facility is 470 ° C and an operating pressure condition is 780 to 800 kPaG. At least a reaction facility for generating hydrogen sulfide gas from sulfur and hydrogen gas, a plurality of cooling facilities for cooling the generated hydrogen sulfide gas, a sulfur removal facility for removing sulfur contained in the hydrogen sulfide gas, and A method of recovering and using waste hydrogen sulfide gas generated in a hydrogen sulfide gas production plant comprising a sulfur cooling facility for cooling a part of sulfur supplied to the reaction facility,
The hydrogen sulfide gas production plant is provided with a pipe for recovering waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant and connected at one end to a treatment plant using the hydrogen sulfide gas.
Recovering the exhausted hydrogen sulfide gas discharged through the piping, supplying the waste hydrogen sulfide gas to the treatment plant;
The sulfur cooled in the sulfur cooling facility is again supplied to the reaction facility by a circulation pump and / or the cooled sulfur is supplied to a sulfur treatment plant using sulfur. Collection and usage method. The hydrogen sulfide gas production plant is provided with a pressure gauge for measuring the pressure of the waste hydrogen sulfide gas in the pipe, and further controls the supply of the waste hydrogen sulfide gas to the treatment plant side from the pressure gauge. Control valve is provided,
When the waste hydrogen sulfide gas recovered by opening the control valve is supplied to the processing plant and the pressure measured by the pressure gauge is reduced to such an extent that the change hardly disappears, the control valve The method for recovering and using waste hydrogen sulfide gas according to claim 11, wherein the supply of the waste hydrogen sulfide gas is stopped by closing the valve.   The piping is branched at a predetermined branching point and can be connected to a plurality of processing plants that use hydrogen sulfide gas, and the pressure gauges are respectively connected to the plurality of piping formed by branching. The method for recovering and using waste hydrogen sulfide gas according to claim 12, wherein the control valve is provided. The plurality of processing plants are different in the pressure of the hydrogen sulfide gas used,
The first control valve in the pipe connected to the first processing plant having a high pressure to be used is opened, and the second control valve in the pipe connected to the second processing plant having a low pressure to be used is used. To supply the waste hydrogen sulfide gas to the first processing plant,
When the pressure measured by the pressure gauge in the pipe connected to the first processing plant drops to such an extent that the change hardly disappears, the first control valve is closed and the second 14. The method for recovering and using waste hydrogen sulfide gas according to claim 13, wherein the waste hydrogen sulfide gas is supplied to the second processing plant by opening the control valve.   The method for recovering and using waste hydrogen sulfide gas according to any one of claims 11 to 14, wherein an operating temperature condition in the reaction facility is 470 ° C and an operating pressure condition is 780 to 800 kPaG.

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