Sodium sulfide liquid preparation device and sodium sulfide liquid preparation system

Abstract

The present invention provides a sodium sulfide liquid preparation device and a sodium sulfide liquid preparation system. The sodium sulfide liquid preparation device includes: a water quenching reaction mechanism having a receiving cavity. The water quenching reaction mechanism includes a liquid outlet channel that communicates with an external sodium sulfide melt and extends into the receiving cavity. A water quenching spray gun communicates with the receiving cavity and faces the opening of the liquid outlet channel, and is used to cool the sodium sulfide melt to obtain a hot sodium sulfide solution. A solid-liquid separation mechanism communicates with the receiving cavity and is located below the liquid outlet channel, and is used to separate the sodium sulfide solution from the hot sodium sulfide solution. The above-mentioned sodium sulfide liquid preparation device uses water from the water quenching spray gun to cool the sodium sulfide melt to obtain a hot sodium sulfide solution, and the sodium sulfide solution can be obtained after solid-liquid separation. The sodium sulfide liquid preparation device can effectively prepare a sodium sulfide solution and reduce the pollution and energy consumption generated during the traditional heating process.

Description

Technical Field

[0001] The present invention relates to the resource utilization of solid waste, and particularly to a sodium sulfide liquid preparation device and a sodium sulfide liquid preparation system. Background Art

[0002] Sodium sulfide is widely used in industries such as papermaking, leather, polyphenylene sulfide (special engineering plastic PPS), non-ferrous metal ore dressing, smelting of heavy metals and arsenic-containing sewage treatment, textile, printing and dyeing, dyes, pigments, polysulfide rubber, medicine, organic chemical intermediates, and lithopone manufacturing. It is an important way to realize the resource utilization of sodium sulfate miscellaneous salt solid waste.

[0003] In existing primary ore sodium sulfide and regenerated sodium sulfide production enterprises, more than 90% use the pulverized coal reduction method, and the rest are the barium sulfate by-product method and the alkali solution absorption of hydrogen sulfide method. Existing sodium sulfide products are mainly sodium sulfide solids, and are mainly prepared from a mixed solution containing sodium sulfide prepared by the above methods. Summary of the Invention

[0004] The main object of the present invention is to provide a sodium sulfide liquid preparation device and a sodium sulfide liquid preparation system for preparing a sodium sulfide solution from a sodium sulfide melt.

[0005] To achieve the above object, the present application provides a sodium sulfide liquid preparation device, the liquid preparation device comprising:

[0006] A water quenching reaction mechanism having a receiving cavity, the water quenching reaction mechanism comprising a liquid outlet channel communicating with an external sodium sulfide melt and extending into the receiving cavity.

[0007] A water quenching spray gun communicating with the receiving cavity and facing the opening of the liquid outlet channel for cooling the sodium sulfide melt to obtain a hot sodium sulfide solution.

[0008] A solid-liquid separation mechanism communicating with the receiving cavity and located below the liquid outlet channel for separating the sodium sulfide solution from the hot sodium sulfide solution.

[0009] According to an embodiment of the present application, the liquid preparation device further comprises an impact plate located in the receiving cavity and within the spraying range of the water quenching spray gun.

[0010] According to an embodiment of the present application, the water quenching spray gun and the liquid outlet channel are located on the same side of the water quenching reaction mechanism, and the opening of the water quenching spray gun is upward.

[0011] According to an embodiment of the present application, the liquid preparation device further comprises a stirring mechanism located below the receiving cavity of the water quenching reaction mechanism.

[0012] According to an embodiment of the present application, the impact plate has a first side and a second side oppositely arranged along its own thickness direction. The first side is the side where the impact plate faces the liquid outlet channel, and the stirring mechanism is located on the second side of the impact plate.

[0013] According to an embodiment of the present application, the bottom of the water quenching reaction mechanism has an inclined surface.

[0014] In the direction from the first side to the second side, the height of the inclined surface gradually decreases, and the stirring mechanism is spaced apart from the end of the inclined surface at the second side edge.

[0015] According to an embodiment of the present application, the liquid making device further includes a water vapor absorption mechanism, and the water vapor absorption mechanism is communicated with the upper part of the accommodation cavity.

[0016] According to an embodiment of the present application, the water quenching spray gun includes a Venturi tube mixer. The main pipe of the Venturi tube mixer is communicated with the lower part of the accommodation cavity, and the side pipe of the Venturi tube mixer is connected to an external water tank.

[0017] According to an embodiment of the present application, at least one of the main pipe and / or the side pipe has a flow rate regulating mechanism.

[0018] The present application also provides a sodium sulfide liquid making system, which includes a melting reduction furnace and the above-mentioned sodium sulfide liquid making device. The sodium sulfide liquid making device is communicated with the melting reduction furnace to receive the sodium sulfide melt prepared by the melting reduction furnace.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] The above-mentioned sodium sulfide liquid making device uses water from the water quenching spray gun to cool the sodium sulfide melt to obtain a hot sodium sulfide solution, and a sodium sulfide solution can be obtained after solid-liquid separation. This sodium sulfide liquid making device can effectively prepare a sodium sulfide solution and reduce the pollution and energy consumption generated during the traditional heating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0022] Figure 1 Schematic diagram of a liquid making device according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of a liquid making device according to an embodiment of the present invention;

[0024] Figure 3 Partial structural schematic diagram of a sodium sulfide preparation system according to an embodiment of the present invention;

[0025] Figure 4 Cross-sectional schematic diagram of a sodium sulfide preparation system according to an embodiment of the present invention;

[0026] Figure 5 Process schematic diagram for preparing sodium sulfide in Example 1 of the present invention.

[0027] Reference numerals: 100, melting reduction furnace; 101, raw material bin; 102, auxiliary material bin; 103, mixing device; 104, closed conveying mechanism; 105, melting heating assembly; 106, reduction heating assembly; 107, lifting motor; 108, sealing ring; 109, emergency drainage channel in the melting zone; 110, emergency drainage channel in the reduction zone; 111, siphon pipeline; 12, auxiliary heating assembly for liquid discharge;

[0028] 10, melting zone; 11, reduction zone; 16, auxiliary heating assembly in the reduction zone; 17, baffle assembly; 18, auxiliary heating assembly in the melting zone;

[0029] 20, water quenching reaction mechanism; 21, accommodation chamber; 22, slurry pump; 23, baffle plate;

[0030] 30, water quenching spray gun; 31, Venturi-type pipeline mixer; 32, main pipeline; 33, side pipeline; 34, circulation pump;

[0031] 40, solid-liquid separation mechanism; 41, stirring paddle;

[0032] 50, impact plate;

[0033] 60, water vapor absorption mechanism.

[0034] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that all the directional indications (such as up, down,...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, in the present invention, descriptions such as "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0038] Moreover, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] When an embodiment gives a numerical range, it should be understood that unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention, based on the understanding of those skilled in the art of the prior art and the description of the present invention, any methods, devices, and materials of the prior art similar or equivalent to those described in the embodiments of the present invention can also be used to implement the present invention.

[0040] This application provides a sodium sulfide solution preparation device. Referring to Figure 1 and Figure 2 , the solution preparation device includes a water quenching reaction mechanism 20, a water quenching spray gun 30, and a solid-liquid separation mechanism 40.

[0041] The water quenching reaction mechanism 20 has a receiving cavity 21. Referring to Figure 1 , the shape of the receiving cavity 21 is adapted to the shape of the water quenching reaction mechanism 20. Exemplarily, the water quenching reaction mechanism 20 can be a tower-like structure. That is, the receiving cavity 21 has a relatively small lateral width and a relatively large longitudinal height. When the water quenching reaction mechanism 20 is a tower-like structure, the material of the water quenching reaction mechanism 20 is mainly corrosion-resistant metal.

[0042] Exemplarily, referring to Figure 2 , the water quenching reaction mechanism 20 can be a pool-like structure. That is, the receiving cavity 21 has a relatively large lateral width and a relatively short longitudinal height. When the water quenching reaction mechanism 20 can be a pool-like structure, the water quenching reaction mechanism 20 can be a building structure, such as composed of brick masonry, glass, etc., thereby reducing the cost.

[0043] The liquid outlet channel is in communication with the accommodation chamber 21, thereby inputting the molten sodium sulfide into the water quenching reaction mechanism 20. The water quenching spray gun 30 is in communication with the accommodation chamber 21 and faces the opening of the liquid outlet channel. In this way, the high-pressure liquid flow (such as water flow or sodium sulfide solution) sprayed by the water quenching spray gun 30 comes into contact with the molten sodium sulfide ejected from the liquid outlet channel, cooling the molten sodium sulfide to obtain a hot sodium sulfide solution.

[0044] The water quenching spray gun 30 uses a high-pressure liquid flow to impact, disperse, and cool the molten sodium sulfide. The heat in the molten sodium sulfide is quickly carried away by the high-pressure liquid flow to form water vapor and a hot sodium sulfide solution. The hot sodium sulfide solution flows into the bottom of the accommodation chamber 21. The bottom of the accommodation chamber 21 has a collection part. The shape of the collection part is a conical hopper shape that converges from both sides to the middle, or a conical hopper shape that converges from one side to the opposite side.

[0045] That is, the bottom of the accommodation chamber 21 can be in the shape of a conical hopper (such as when the water quenching reaction mechanism 20 is a tower structure) or have an inclined surface (such as when the water quenching reaction mechanism 20 is a pool structure), which is convenient for collecting the hot sodium sulfide solution.

[0046] The solid-liquid separation mechanism 40 is in communication with the accommodation chamber 21 and is located below the liquid outlet channel, and is used to separate the sodium sulfide solution in the hot sodium sulfide solution. In order to promote the flow of the hot sodium sulfide solution, in some embodiments, a slurry pump 22 is connected to the pipeline between the solid-liquid separation mechanism 40 and the accommodation chamber 21.

[0047] Furthermore, referring to Figure 1 and Figure 2 , the liquid preparation device further includes an impact plate 50. The impact plate 50 is located in the accommodation chamber 21. The water quenching spray gun 30 is disposed opposite to the impact plate 50 and is within the spraying range of the water quenching spray gun 30. There is a certain distance between the impact plate 50 and the water quenching spray gun 30. The water discharged from the water quenching spray gun 30 impacts the molten sodium sulfide onto the impact plate 50, and the particles in the molten sodium sulfide collide with the impact plate 50 and break.

[0048] At the same time, the molten sodium sulfide has strong corrosiveness. When it comes into direct contact with the wall or the inner lining of the wall of the water quenching reaction mechanism 20, it is easy to corrode the wall or the inner lining. And replacing the inner lining is rather cumbersome. If the wall is corroded, it will reduce the production service life of the equipment. By providing the impact plate 50, the direct impact of the molten sodium sulfide on the wall or the inner lining of the water quenching reaction mechanism 20 causing corrosion can be basically eliminated. After the molten sodium sulfide comes into contact with the impact plate 50, it falls into the hot sodium sulfide solution below, with a reduced flow rate and a reduced temperature, and thus the corrosiveness is reduced. In this way, the corrosiveness to the wall or the inner lining is reduced. The impact plate 50 is relatively easy to replace, and the cost of the impact plate 50 is low, reducing the replacement cost. Therefore, the liquid preparation device can operate stably for a long time, the maintenance cost of the equipment is reduced, and the production service life is extended.

[0049] In some embodiments, referring to Figure 1 and Figure 2 , the impact plate 50 is located above the bottom of the accommodation chamber 21. The impact plate 50 does not contact the bottom of the accommodation chamber 21, and a channel is formed therebetween, so that the hot sodium sulfide solution can pass through and converge to the bottom of the accommodation chamber 21.

[0050] In some embodiments, referring to Figure 1 and Figure 2 , the opening of the water quenching spray gun 30 can be arranged upward or downward. Exemplarily, the opening of the water quenching spray gun 30 can be arranged upward. In this case, the flow direction of the high-pressure liquid flow is upward, and the flow direction of the sodium sulfide melt is downward, and the two directions are opposite. Under the action of the high-pressure liquid flow, the sodium sulfide melt moves upward and impacts on the impact plate and breaks. This can reduce the amount of sodium sulfide melt (especially the larger blocks in the sodium sulfide melt) directly falling into the hot sodium sulfide solution below. In this way, the particles of the sodium sulfide melt falling into the hot sodium sulfide solution are finer and easier to dissolve.

[0051] In some embodiments, the water quenching spray gun 30 and the liquid outlet channel are located on the same side of the water quenching reaction mechanism. In this way, the water quenching spray gun 30 has a better installation space and is more convenient to set. Moreover, in this way, the space on the side of the water quenching reaction mechanism where the water quenching spray gun 30 is not provided is left for other components, such as the stirring mechanism.

[0052] In some embodiments, the liquid making device further includes a stirring mechanism located below the accommodation chamber 21 of the water quenching reaction mechanism 20. The stirring blades of the stirring mechanism continuously stir to promote the continuous dissolution of the small particle sodium sulfide melt. The sodium sulfide solution flows into the solid-liquid separator along the impact plate 50. The stirring blades 41 in the solid-liquid separator further promote the dissolution of the remaining small particle sodium sulfide melt.

[0053] In some embodiments, the stirring mechanism is located in the middle or on one side of the water quenching reaction mechanism 20.

[0054] Exemplarily, when the water quenching reaction mechanism 20 is a tower-like structure, the stirring mechanism is located in the middle of the water quenching reaction mechanism 20, that is, on the central axis of the tower-like structure.

[0055] Also exemplarily, when the water quenching reaction mechanism 20 is a pool-like structure, the stirring mechanism is located on one side in the transverse direction of the water quenching reaction mechanism 20. For example, in some embodiments, the impact plate 50 has a first side and a second side oppositely arranged along its own thickness direction, the first side is the side where the impact plate 50 faces the liquid outlet channel, and the stirring mechanism is located on the second side of the impact plate 50. In this way, the stirring mechanism has a larger installation space and has a distance from the water quenching reaction mechanism 20 in the transverse direction, avoiding interference between the stirring mechanism and the water quenching reaction mechanism 20 during the working process.

[0056] On one side (the first side, such as the left side in Figure 2 ) in the lateral direction of the water quenching reaction mechanism 20, a water quenching spray gun 30 and a liquid outlet channel are provided, and on the other side (the second side, such as the right side in Figure 2 ), a stirring mechanism is provided. That is, the water quenching reaction mechanism 20 can be understood as including two zones in the lateral direction. One zone is the water quenching reaction zone, corresponding to the area on the side of the water quenching spray gun 30 and the liquid outlet channel. The other zone is the stirring zone, corresponding to the area on the side of the stirring mechanism. The water quenching reaction zone and the stirring zone are basically bounded by the impact plate.

[0057] Furthermore, the bottom of the water quenching reaction mechanism has an inclined surface. In the direction from the first side to the second side, the height of the inclined surface gradually decreases, and the stirring mechanism is spaced from the end of the inclined surface at the second side edge.

[0058] The inclined surface at the bottom of the accommodation cavity extends from the water quenching reaction zone to near the stirring mechanism in the stirring zone. The height of the inclined surface gradually decreases along this direction. The setting of the inclined surface is beneficial to the flow and aggregation of the hot sodium sulfide solution to the stirring zone, and during the flow process, the particles in the hot sodium sulfide solution will also be more likely to become fine particles.

[0059] The stirring mechanism is spaced from the end of the inclined surface at the second side edge, so that there is a relatively large space below the stirring mechanism in the direction from the first side to the second side.

[0060] In some embodiments, referring to Figure 3 , the liquid preparation device further includes a water vapor absorption mechanism 60, such as a blower. The water vapor absorption mechanism 60 is communicated with the upper part of the accommodation cavity 21 to discharge the water vapor in the water quenching reaction mechanism 20, such as discharging it to an absorption tower.

[0061] The water vapor absorption mechanism 60 includes a suction port, and the suction port can be communicated with the middle part above the accommodation cavity 21. When the water quenching reaction mechanism 20 is in a pool structure, if the water quenching spray gun 30 and the liquid outlet channel are located on one side of the water quenching reaction mechanism 20, there is a relatively large distance between the water vapor absorption mechanism 60 and the water quenching spray gun 30 in the lateral direction, which can reduce the water and / or hot sodium sulfide solution sprayed by the water quenching spray gun 30 from entering the water vapor absorption mechanism 60.

[0062] In some embodiments, the water quenching reaction mechanism 20 further includes a baffle plate 23 arranged in the accommodation cavity 21. The baffle plate 23 faces the suction port of the water vapor absorption mechanism 60 and is spaced from the suction port. The area of the baffle plate 23 is larger than the area of the suction port. In this way, the water and / or hot sodium sulfide solution sprayed by the water quenching spray gun 30 can be further reduced from entering the water vapor absorption mechanism 60.

[0063] In addition, the baffle 23 can also reduce the total amount of sodium sulfide particles carried by the steam in the accommodation chamber 21 from entering the water vapor absorption mechanism 60. The heat in the sodium sulfide melt is quickly carried away by the high-pressure liquid flow, and the water in the high-pressure liquid flow forms water vapor. The water vapor transpires upward and is likely to carry fine sodium sulfide particles into the water vapor absorption mechanism 60. The baffle 23 prevents the water vapor from moving directly upward, extending the movement path of the water vapor. During this process, the sodium sulfide particles will settle down.

[0064] In some embodiments, the baffle 23 is connected to the impact plate 50 to further increase the strength of the impact plate 50. Exemplarily, the edge of the baffle 23 extends beyond the position of the impact plate 50 towards the water quenching spray gun 30. In this way, the part of the baffle 23 that extends beyond the impact plate 50 can block the water and / or sodium sulfide hot solution sprayed by the water quenching spray gun 30 from moving upward, thereby forming a better shield.

[0065] In some embodiments, referring to Figure 3 , the water quenching spray gun 30 includes a Venturi pipe mixer 31. The main pipe 32 of the Venturi pipe mixer 31 communicates with the lower part of the accommodation chamber 21, and the side pipe 33 of the Venturi pipe mixer 31 is connected to an external water tank.

[0066] There is a Venturi pipe mixer 31 in the water quenching spray gun 30. The spraying liquid of the main pipe 32 comes from the clear liquid below the accommodation chamber 21, and the side pipe 33 is connected to the tap water tank.

[0067] Exemplarily, a circulation pump 34 is provided on the main pipe 32. By controlling the power of the circulation pump 34, the flow rate and the amount of inhaled clear water can be precisely controlled. Combining with the amount of the bottom discharged liquid of the solid-liquid separation, the concentration of the overall circulating liquid is controlled. Therefore, the final liquid sodium sulfide concentration obtained by the present invention is adjustable, and liquid sodium sulfide products with different concentrations can be produced according to the sodium sulfide concentration requirements. When the amount of inhaled clear water and the clear liquid are large, the liquid sodium sulfide concentration is small; conversely, when the amount of inhaled clear water and the clear liquid are small, the liquid sodium sulfide concentration is large.

[0068] Furthermore, referring to Figure 3 , the solid-liquid separation mechanism 40 is a filter press, and the filtrate is a sodium sulfide solution.

[0069] A slurry pump 22 can also be provided between the solid-liquid separation mechanism 40 and the filter press. The slurry pump 22 can regularly extract the bottom slurry for solid-liquid separation in the filter press, and the separated liquid is the liquid sodium sulfide product.

[0070] A sodium sulfide liquid production system includes a melting reduction furnace and the above-mentioned sodium sulfide liquid production device. The sodium sulfide liquid production device is communicated with the melting reduction furnace to receive the sodium sulfide melt prepared by the melting reduction furnace.

[0071] It should be noted that as a solid waste, sodium sulfate miscellaneous salt currently does not have a relatively environmentally friendly, reliable and economically practical treatment method to realize the reasonable recycling of this kind of solid waste.

[0072] In order to realize the resource utilization of sodium sulfate miscellaneous salt, referring to the smelting reduction furnace 100 shown in Figures 3 to 4 the present invention provides a sodium sulfate miscellaneous salt smelting reduction furnace 100, and the smelting reduction furnace 100 includes a furnace body and a heating mechanism.

[0073] An inner cavity isolated from the outside is formed inside the furnace body to provide a place for smelting reduction and prevent the entry of oxygen.

[0074] The cavity is partitioned into a melting zone 10 and a reduction zone 11. The melting zone 10 is the melting furnace hearth, mainly used for melting sodium sulfate miscellaneous salt; the reduction zone 11 is the reduction furnace hearth, mainly used for reducing the melted sodium sulfate miscellaneous salt.

[0075] A baffle component 17 is provided in the furnace body, and the cavity is partitioned by the baffle component 17 to form the melting zone 10 and the reduction zone 11. Specifically, the melting zone 10 and the reduction zone 11 can be partitioned horizontally by the baffle component 17. The baffle component 17 can be made of high-magnesium material, and the baffle component 17 can specifically be composed of highly alkaline-resistant high-magnesium refractory bricks, that is, composed of a partition wall.

[0076] To ensure the continuity of melting and reduction, the bottom of the melting zone 10 and the bottom of the reduction zone 11 are interconnected. Specifically, the baffle component 17 is spaced from the inner bottom surface of the cavity; that is, there is a gap between the baffle component 17 and the inner bottom surface of the cavity, so that a bottom flow channel is formed between the baffle component 17 and the inner bottom surface of the cavity, and the bottom of the melting zone 10 and the bottom of the reduction zone 11 are interconnected through the bottom flow channel.

[0077] As an optional implementation manner, the highly alkaline-resistant high-magnesium refractory bricks may not extend to the inner top surface of the cavity, that is, there may be a certain distance between the baffle component 17 and the inner top surface of the cavity. Based on this, in addition to the melting zone 10 and the reduction zone 11, there may also be an activity zone in the cavity. The activity zone is located above the melting zone 10 and the reduction zone 11 at the same time, and together with the melting zone 10 and the reduction zone 11, it constitutes the cavity.

[0078] To facilitate the discharge of the gases generated in the melting zone and the reduction zone, the active zone can be communicatively connected to an external gas collection device. A negative pressure mechanism can be provided in the gas collection device to facilitate the extraction of the gases generated in the reduction zone and the melting zone into the gas collection device. Specifically, a gas discharge channel is further provided in the furnace body. The intake end of the gas discharge channel can be communicatively connected to both the melting zone 10 and the reduction zone 11 simultaneously, or can be directly communicatively connected to the active zone. The connection position of the intake end of the gas discharge channel to the active zone can be located directly above the reduction zone, and the exhaust end of the gas discharge channel can be communicatively connected to a gas collection device equipped with a negative pressure mechanism.

[0079] To facilitate the feeding of materials to the melting zone 10, the furnace body is provided with a feeding channel for feeding materials to the melting zone 10, and the discharge port of the feeding channel is communicatively connected to the melting zone 10. The discharge port of the feeding channel can be located above the melting zone 10. Specifically, the feeding channel can be vertically arranged, with the inlet of the feeding channel being positioned higher, communicatively connected and sealed with the discharge port of an external closed conveying mechanism 104. The discharge port of the feeding channel is positioned lower and is directly communicatively connected to the cavity, and vertically coincides with the melting zone 10.

[0080] To facilitate the liquid discharge from the reduction zone 11, the furnace body is further provided with a liquid discharge channel for discharging liquid from the reduction zone 11, and the liquid inlet of the liquid discharge channel is communicatively connected to the reduction zone 11. The liquid discharge channel can include or be a siphon pipeline 111, that is, the siphon pipeline 111 can constitute the liquid discharge channel. The liquid inlet of the siphon pipeline 111 is communicatively connected to the bottom of the reduction zone 11, that is, the liquid inlet of the siphon pipeline 111 can extend to the bottom of the reduction zone 11. The liquid outlet of the siphon pipeline 111 is communicatively connected to an external device. For example, it can be communicatively and sealedly connected to the liquid inlet of a liquid making device 112.

[0081] To prevent the liquid discharge channel from discharging the melt that has not been reduced yet, the liquid inlet of the liquid discharge channel can be set away from the underflow channel.

[0082] To facilitate the conveyance of the reduced melt, the highest point inside the siphon pipeline 111 can be lower than the highest point of the reduction zone 11, that is, the highest point of the liquid discharge channel can be lower than the highest point of the reduction zone 11, and preferably lower than the highest liquid level of the melt in the reduction zone 11. The material of the siphon pipeline 111 can be an inorganic material such as a custom-molded corundum pipe or magnesia-zirconia pipe.

[0083] Further, in order to avoid melt consolidation, a liquid outlet auxiliary heating assembly 12 may be provided on the siphon pipeline 111. The liquid outlet auxiliary heating assembly 12 is used to heat the siphon pipeline 111. The liquid outlet auxiliary heating assembly 12 may include a resistance wire wound around the outside of the siphon pipeline 111, that is, the auxiliary heating method of the liquid outlet auxiliary heating assembly 12 may be resistance auxiliary heating.

[0084] The heating mechanism includes a melting heating assembly 105 for heating the melting zone 10 and a reduction heating assembly 106 for heating the reduction zone 11.

[0085] Both the melting heating assembly 105 and the reduction heating assembly 106 may include electric heating elements. That is, the melting heating assembly 105 may include a first electric heating element, and the reduction heating assembly 106 may include a second electric heating element. When working, the first electric heating element extends into the interior of the melting zone 10, and the second electric heating element extends into the interior of the reduction zone 11 when working.

[0086] The melting heating assembly 105 may further include a first driving member, and the reduction heating assembly 106 may further include a second driving member. The first driving member is used to drive the first electric heating element to move up and down within the melting zone 10. The second driving member is used to drive the second electric heating element to move up and down within the reduction zone 11.

[0087] Specifically, both the melting heating assembly 105 and the reduction heating assembly 106 may include a carbonaceous electrode group that is electrically controlled to lift and lower. The carbonaceous electrode group may be one pair or multiple pairs, for example, it may be three pairs of carbonaceous electrode groups. A pair of carbonaceous electrode groups may specifically be composed of two carbonaceous electrodes. One of the carbonaceous electrodes is energized positively during operation, and the other carbonaceous electrode is energized negatively during operation. That is, both the first electric heating element and the second electric heating element may include or be a carbonaceous electrode group, and the carbonaceous electrode may specifically be a graphite electrode. Each carbonaceous electrode is equipped with a lifting motor 107. The lifting motor 107 may be a stepping motor, which drives the carbonaceous electrode to lift and lower through a lead screw drive. Both the first driving member and the second driving member may include or be the lifting motor 107. The lower part of the carbonaceous electrode can be understood as the heating part. During operation, the heating part of the carbonaceous electrode needs to be extended into the area to be heated through the control of the lifting motor 107. And during the working process, the carbonaceous electrode is slowly consumed, the current fluctuates accordingly, and the lifting motor 107 will automatically compensate for the insertion depth of the consumed carbonaceous electrode to make the working process more stable.

[0088] The carbonaceous electrodes of the melting heating assembly 105 extend downward from the upper part of the furnace body into the furnace body, and during operation, the heating part is extended into the interior of the melting zone 10, and the furnace body is provided with a first hole through which the carbonaceous electrodes of the melting heating assembly 105 extend into the melting zone 10.

[0089] The carbon electrode of the reduction heating component 106 extends downward into the furnace body from above the furnace body, and during operation, the heating part extends into the interior of the reduction zone 11, and the furnace body is provided with a second channel for the carbon electrode of the reduction heating component 106 to extend into the reduction zone 11.

[0090] The apertures of the first channel and the second channel are slightly larger than the outer diameters of the corresponding carbon electrodes, and detachable sealing rings 108 are installed at the upper ports of the first channel and the second channel to seal the gaps between the carbon electrodes and the first channel and the second channel. When the sealing ring 108 is removed, the gaps between the carbon electrodes and the first channel and the second channel can serve as detection channels. For example, the reduction effect can be detected by passing a carbon rod through the detection channel from top to bottom and extending it into the reduction zone 11.

[0091] To avoid the occurrence of a dead furnace phenomenon caused by the cooling and hardening of the melt in the furnace during production failures, the furnace body is provided with a molten zone emergency drainage channel 109 and a reduction zone emergency drainage channel 110; the molten zone emergency drainage channel 109 is communicated with the bottom of the molten zone 10, and the reduction zone emergency drainage channel 110 is communicated with the bottom of the reduction zone 11, that is, the liquid inlet of the molten zone emergency drainage channel 109 can extend to the bottom of the molten zone 10, and the liquid outlet of the reduction zone emergency drainage channel 110 can extend to the bottom of the reduction zone 11; both the molten zone emergency drainage channel 109 and the reduction zone emergency drainage channel 110 are equipped with drainage valve bodies to facilitate the control of the drainage of the melt. That is: a molten zone drainage valve body for controlling the opening and closing of the molten zone emergency drainage channel 109 can be provided in the molten zone emergency drainage channel 109; a reduction zone drainage valve body for controlling the opening and closing of the reduction zone emergency drainage channel 110 can be provided in the reduction zone emergency drainage channel 110.

[0092] Since the sodium sulfate and sodium sulfide melts are different from ordinary metal melts, their cooling speeds are very fast, and their viscosities are high and fluidities are not strong when the temperature drops. Both the molten zone emergency drainage channel 109 and the reduction zone emergency drainage channel 110 are equipped with auxiliary heating components. For distinction, the auxiliary heating component on the molten zone emergency drainage channel 109 is the molten zone auxiliary heating component 18, and the auxiliary heating component on the reduction zone emergency drainage channel 110 is the reduction zone auxiliary heating component 16. Both the molten zone auxiliary heating component 18 and the reduction zone auxiliary heating component 16 can be resistance auxiliary heating components.

[0093] Specifically, both the molten zone emergency drainage channel 109 and the reduction zone emergency drainage channel 110 can be designed as corundum tubes, zirconia tubes, magnesia ceramic tubes, etc. wound with resistance wires. The outer wound resistance wires are encapsulated and shaped by refractory ramming materials, etc. During discharging, the melt fluidity is maintained by auxiliary resistance heating. In addition, the power supplies for the auxiliary heating devices of the molten zone emergency drainage channel 109 and the reduction zone emergency drainage channel 110 are separated from the power supplies of the molten heating assembly 105 and the reduction heating assembly 106 to avoid simultaneous power failure.

[0094] It should be emphasized that the smelting reduction furnace 100 provided by the present invention has significant differences from traditional single furnaces.

[0095] Specifically, for single furnaces:

[0096] For single furnaces, the entire reaction needs to be divided into four stages: arc starting, feeding, reaction, and discharging, repeating in cycles. During the arc starting stage, the surface of the electrode will instantaneously heat up (4000 - 5000 °C). Frequent arc starting will cause too large a temperature difference between the surface and the interior of the electrode, resulting in tiny cracks due to thermal expansion and contraction, and further leading to electrode cracking. Frequent arc starting will greatly reduce the electrode life.

[0097] During the feeding stage, the cold materials will first float on the surface of the melt. For the melt below, due to the carbon dioxide gas generated by the reaction, the gas will carry the unreacted cold materials (especially the relatively light carbon powder) towards the extraction port and be discharged, which will greatly affect the carbonate ratio of the reactants and result in a decrease in the sodium sulfide content in the reaction products.

[0098] Since the viscosity of the sodium sulfide melt will increase significantly as the temperature decreases, during the discharging stage, it is necessary to adopt a discharging method of stopping heating, raising the electrode, and tilting to quickly discharge the material to solve the problem of increased viscosity due to temperature reduction.

[0099] If a continuous feeding and continuous discharging method at the bottom is adopted, during the continuous reaction stage, due to the stirring action generated by the current between the electrodes, the unreacted carbon powder and miscellaneous salts in the upper part will be stirred to the bottom of the single furnace, and directly discharging from the bottom will make it difficult for the sodium sulfide content in the produced material to meet the standard stably.

[0100] On the contrary, for the smelting reduction furnace 100 provided in this application:

[0101] Compared with the intermittent reaction of single furnaces, the double furnace chamber structure in the present invention avoids problems such as excessive electrode loss caused by frequent arc starting and low production efficiency caused by the need to stop the reaction during the discharging stage.

[0102] Comparing with the continuous reaction of a single furnace, since the present invention is divided into a melting zone 10 and a reduction zone 11, compared with a single furnace which only has a fluid cycle of up and down tumbling, the present invention adds a lateral material circulation (underflow channel). During continuous operation, the content of sodium sulfide in the melting zone 10 is low, and it will gradually react during the process of flowing through the reduction zone 11 to the siphon port (the feed port of the siphon pipeline 111) until the content of sodium sulfide reaches the stable standard.

[0103] Moreover, the exhaust channel of the present application can be arranged close to the liquid inlet of the siphon pipeline 111. Coupled with the baffle assembly 17 (partition wall) higher than the melt surface, the melting zone 10 is only responsible for melting, which can effectively isolate the impact and entrainment of the carbon dioxide gas generated during the reaction on the cold materials, and solves the problem that the materials in a single furnace will be lost with the gas.

[0104] The present invention also provides an application of the smelting reduction furnace 100 as described in any of the above embodiments in reducing sodium sulfate miscellaneous salts.

[0105] Specifically, when applying the smelting reduction furnace 100 to reduce sodium sulfate miscellaneous salts, the working mode of the smelting reduction furnace 100 can be:

[0106] During production, the carbon electrode extending into the melting zone 10 is arc-started to heat up, and the mixed material of sodium sulfate miscellaneous salts and auxiliary materials (low-ash carbon powder) is fed into the melting zone 10 in a sealed manner.

[0107] The molten melt flows to the reduction zone 11 through the underflow channel below the baffle assembly 17 and contacts the paired carbon electrodes in the reduction zone. At the same time, the paired carbon electrodes in the reduction zone 11 are arc-started to heat up. When the melt is heated to about 900 °C, the reduction of sodium sulfate starts rapidly.

[0108] Meanwhile, as the feeding to the melting zone 10 continues, the mixed material (powdered solid material) falls into the melting zone 10 and floats on the surface of the molten material melt, gradually melts and then slowly sinks, and continuously flows into the reduction zone 11. Among them, as the materials are continuously added, the liquid level in the melting zone 10 rises and the pressure increases. After melting, the materials continuously sink and flow into the reduction zone 11 through the underflow channel. Furthermore, the liquid level in the reduction zone 11 also rises accordingly, and the pressure increases. At this time, the reduced melt will be continuously discharged through the siphon pipeline 111.

[0109] During the working process, the reduction effect of the sodium sulfate melt in the reduction zone 11 can be detected and analyzed by a probe. By adjusting the continuous feeding speed to the melting zone 10, the overall residence time of the melt in the furnace can be controlled to achieve an ideal reduction effect, so as to control the quality of the final product. It should be noted that the faster the feeding speed, the shorter the residence reaction time of the melt in the furnace and the lower the quality; the slower the feeding speed, the longer the residence reaction time of the melt in the furnace and the higher the quality.

[0110] See Figures 3 to 4 As shown, the present invention also provides a sodium sulfide preparation system, including the molten reduction furnace 100 described in any of the above embodiments, and further including a mixing device 103 and a liquid preparation device 112, so as to convert sodium sulfate miscellaneous salts into a sodium sulfide solution and realize the resource utilization of solid waste.

[0111] Wherein, the feed channel of the molten reduction furnace 100 is communicated with the discharge port of the mixing device 103, and the airtightness of the connection is maintained to receive the mixed material in the mixing device 103 in a closed environment; the liquid discharge channel of the molten reduction furnace 100 is communicated with the liquid dropping port of the liquid preparation device 112, and the airtightness of the connection is maintained to discharge the melt to be powdered in the reduction zone 11 to the liquid preparation device 112 in a closed environment.

[0112] As an explanation of the mixing device 103, the mixing device 103 can be a horizontal mixer, and the mixing device 103 can include a raw material bin 101, an auxiliary material bin 102, a mixing chamber and a closed conveying mechanism 104.

[0113] The discharge ports of the raw material bin 101 and the auxiliary material bin 102 are both hermetically communicated with the mixing chamber; the discharge ports of the raw material bin 101 and the auxiliary material bin 102 can both be located above the mixing chamber, and the discharge ports of the raw material bin 101 and the auxiliary material bin 102 can both control the opening and closing states through an electric control star-shaped discharge valve.

[0114] The mixing device 103 and the molten reduction furnace 100 can convey the mixed material through the closed conveying mechanism 104, that is, the discharge port of the mixing chamber can be hermetically communicated with the feed channel of the molten reduction furnace 100 through the closed conveying mechanism 104, thereby forming a complete continuous closed feeding path and avoiding the introduction of oxygen during the molten reduction feeding process. Among them, the discharge port of the mixing chamber is located at the bottom of the mixing chamber and above the feed port of the closed conveying mechanism 104, and the two are hermetically arranged; the discharge port of the closed conveying mechanism 104 is located above the feed channel of the molten reduction furnace 100, and the two are hermetically arranged; the closed conveying mechanism 104 can be a closed screw conveyor.

[0115] The present invention also provides an application of a sodium sulfide liquid preparation device in the preparation of a sodium sulfide solution.

[0116] As an explanation of the reactants, the raw materials for preparing the sodium sulfide can include or be sodium sulfate miscellaneous salts; the auxiliary materials for preparing the sodium sulfide can include or be one or more of carbon powder, coal powder and activated carbon, and specifically can be low-ash carbon powder particles.

[0117] As an explanation of the reaction conditions, in the process of preparing the sodium sulfide using the sodium sulfate miscellaneous salt, the working temperature of the melting zone 10 is generally controlled at 750 - 850 °C, and the working temperature of the reduction zone 11 is generally controlled within 950 °C, such as 900 - 950 °C.

[0118] As an explanation of the working mode of the sodium sulfide preparation system:

[0119] After the raw material sodium sulfate miscellaneous salt and the auxiliary material low - ash carbon powder particles are mixed by the mixing device 103, a mixed material is obtained; among them, the mass ratio of the sodium sulfate miscellaneous salt to the low - ash carbon powder is about 4 - 5:1. The sodium sulfate miscellaneous salt mainly contains sodium sulfate, sodium chloride, and moisture; by mass fraction, sodium sulfate accounts for about 80 - 90%, sodium chloride accounts for about 5 - 15%, and moisture accounts for about 5 - 10%.

[0120] During the feeding process, the mixed material enters the melting zone 10 of the continuous melting and reduction furnace 100 through the closed conveying mechanism 104.

[0121] It should be noted that before feeding the melting zone 10, a small amount of the mixed material of the sodium sulfate miscellaneous salt and the auxiliary material low - ash carbon powder particles can be pre - placed at the bottom of the melting zone 10, so that the paired carbon electrodes in the melting zone 10 slightly extend into the mixed material; then, the paired carbon electrodes in the melting zone 10 are arc - started to increase the temperature.

[0122] The specific arc - starting method can be: starting the arc and increasing the temperature by an external electrode rod; or, sprinkling carbon powder between the paired carbon electrodes to facilitate the arc - starting and temperature increase of the carbon electrodes.

[0123] Taking the example of starting the arc and increasing the temperature by an external electrode rod, after the carbon electrodes in the melting zone 10 are arc - started and the temperature is increased, until a melt thin stream starts to be generated between the carbon electrodes, the external electrode rod is removed, and then the melting zone 10 is fed in a closed manner through the closed conveying mechanism 104; when the temperature of the melting zone 10 rises to about 800 °C, a large amount of melt starts to be generated and flows to the reduction zone 11 through the bottom - flow channel; among them, the working temperature of the melting zone 10 is maintained at 750 - 850 °C.

[0124] When the paired carbon electrodes in the reduction zone 11 come into contact with the melt, the carbon electrodes in the reduction zone 11 are arc - started to increase the temperature and continue to heat the melt. Sodium sulfate starts to be rapidly reduced at about 900 °C.

[0125] As the feeding to the melting zone 10 continues, the powdery mixed material falls into the melting zone 10, floats on the surface of the already - melted material melt, gradually melts, becomes heavier and slowly sinks, and continuously flows into the reduction zone 11.

[0126] During the reduction process, the reduction effect of the sodium sulfate melt in the reduction furnace area can be detected and analyzed by a probe, and then the overall residence time of the melt in the furnace can be controlled by adjusting the feeding speed to the melting zone 10 to achieve an ideal reduction effect; the present invention can control the mass content of the reduced sodium sulfide to be greater than 60% to 90% according to different time lengths, and the process can be customized specifically according to product requirements.

[0127] In the above technical solution of the present invention, the above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A sodium sulfide solution preparation system, characterized in that, It includes a smelting reduction furnace and a sodium sulfide liquid preparation device, and the sodium sulfide liquid preparation device is connected to the smelting reduction furnace to receive the sodium sulfide melt prepared by the smelting reduction furnace; The smelting reduction furnace includes a furnace body and a heating mechanism; The interior of the furnace body has a cavity; the cavity is divided into a melting zone and a reduction zone, and the bottoms of the melting zone and the reduction zone are interconnected; The furnace body is provided with a feed channel for feeding materials into the melting zone, a liquid discharge channel for discharging liquid from the reduction zone, and a gas discharge channel for exhausting gas from the reduction zone to the outside; The discharge port of the feed channel is connected to the melting zone, and the liquid inlet of the liquid discharge channel is connected to the reduction zone; The heating mechanism includes a melting heating component for heating the melting zone and a reduction heating component for heating the reduction zone; The liquid discharge channel includes a siphon pipeline, and the liquid inlet of the siphon pipeline is connected to the bottom of the reduction zone; The gas discharge channel is arranged near the liquid inlet of the siphon pipeline to isolate the impact and entrainment of carbon dioxide gas generated during the reaction on cold materials; The liquid preparation device includes: A water quenching reaction mechanism having a receiving cavity, and the water quenching reaction mechanism includes a liquid discharge channel that is connected to the external sodium sulfide melt and extends into the receiving cavity; A water quenching spray gun, which is connected to the receiving cavity and faces the opening of the liquid discharge channel, and is used to cool the sodium sulfide melt to obtain a hot sodium sulfide solution; A solid-liquid separation mechanism, which is connected to the receiving cavity and is located below the liquid discharge channel, and is used to separate the sodium sulfide solution from the hot sodium sulfide solution; The liquid preparation device further includes an impact plate, and the impact plate is located in the receiving cavity and within the spraying range of the water quenching spray gun; The water quenching spray gun and the liquid discharge channel are located on the same side of the water quenching reaction mechanism, and the opening of the water quenching spray gun is upward; The water quenching reaction mechanism further includes a baffle plate arranged in the receiving cavity. The baffle plate faces the suction port of the water vapor absorption mechanism and is spaced from the suction port; the area of the baffle plate is larger than the area of the suction port; the baffle plate is connected to the impact plate, and the edge of the baffle plate extends beyond the position of the impact plate towards the water quenching spray gun; The liquid preparation device further includes a stirring mechanism located below the receiving cavity of the water quenching reaction mechanism; the water quenching reaction mechanism is in a pool-like structure; the impact plate has a first side and a second side arranged oppositely along its thickness direction, the first side is the side where the impact plate faces the liquid discharge channel, and the stirring mechanism is located on the second side of the impact plate; The bottom of the water quenching reaction mechanism has an inclined surface; In the direction from the first side to the second side, the height of the inclined surface gradually decreases, and the stirring mechanism is spaced from the end of the inclined surface at the second side edge; 2. The sodium sulfide liquid preparation system according to claim 1, wherein, The liquid preparation device further includes a water vapor absorption mechanism, and the water vapor absorption mechanism is connected to the upper part of the receiving cavity; 3. The sodium sulfide liquid preparation system according to claim 1, characterized in that, The water quenching spray gun includes a Venturi-type pipeline mixer. The main pipeline of the Venturi-type pipeline mixer is connected to the lower part of the receiving cavity, and the side pipeline of the Venturi-type pipeline mixer is connected to an external water tank.

4. The sodium sulfide liquid preparation system according to claim 3, characterized in that At least one of the main pipeline and / or the side pipeline has a flow regulating mechanism.

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