Sulfur purification method and device for sulfur-containing solid waste

Abstract

The invention relates to the technical field of purification processing of sulfur-containing solid wastes such as sulfur paste, sulfur cakes and sulfur residues, in particular to a sulfur purification method and device for sulfur-containing solid wastes, and the method comprises a pretreatment step of crushing and screening sulfur solid wastes, a solid-liquid separation step, a two-stage heating step, a distillation purification step, a condensation treatment step and a cooling slicing step. When the purified liquid sulfur is subjected to cooling and slicing processing, the liquid sulfur to be cooled is always subjected to heat exchange cooling with a cooling medium (cooling primary liquid) which is just input and has the lowest temperature during initial cooling, so that the cooling speed of the liquid sulfur is greatly improved, the processing efficiency of cooling and slicing is further improved, and the energy consumption is reduced; the trouble that part of liquid sulfur cannot be solidified and sliced due to cooling factors is avoided, and the residue of the liquid sulfur during slice cooling is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of purification and processing of sulfur-containing solid wastes such as sulfur paste, sulfur cake, and sulfur slag, and in particular to a sulfur purification method and device for sulfur-containing solid wastes. Background Art

[0002] Sulfur, a fundamental raw material for modern industry, plays a key role in sulfuric acid production in the chemical industry (accounting for over 70% of global sulfuric acid production). It is used in the metallurgical industry for sulfide ore flotation and precious metal purification. It is a key component in the pesticide industry for the preparation of organosulfur fungicides such as mancozeb. In the rubber industry, it dominates the supply of vulcanizing agents for the vulcanization process. The fuel industry uses it in the production of sulfur-based additives, and the paper industry is indispensable in the kraft pulping process. According to the 2024 "China Chemical Industry Yearbook," my country's annual sulfur consumption has exceeded 18 million tons and is increasing at an average annual rate of 5%. However, domestic sulfur production only meets 35% of demand, with annual imports remaining stable at over 12 million tons. China's external dependence has long been above 60%, primarily relying on natural gas by-product sulfur imports from the Middle East and North America.

[0003] With the massive development of sour crude oil and natural gas resources worldwide, sulfur recovery units have become indispensable equipment for large-scale coal chemical plants, natural gas purification plants, refineries, and petrochemical plants processing coal, sour natural gas, and sour crude oil. These units utilize wet desulfurization technology to produce crude sulfur as a byproduct. However, coke oven gas contains large amounts of coal tar, ash, and other substances, which enter the crude sulfur. This results in a low sulfur content and a black color, making it unsuitable for direct industrial use and of low value. Furthermore, the recovered crude sulfur cannot be directly marketed and is expensive to process. Further purification is required to meet industrial production needs.

[0004] In the Chinese invention patent with patent application number 202210255786.6, a method for recycling and utilizing coke oven gas wet desulfurization resources is specifically disclosed. Sulfur-containing solid waste is purified by hot melting, filtration, and distillation to obtain more than 99.95% of industrial high-quality sulfur.

[0005] However, this technology is limited by the temperature of the cooling medium when the pure sulfur liquid is cooled and sliced, resulting in low processing efficiency of pure sulfur liquid cooling and slicing, frequent maintenance times, and seriously limiting the processing efficiency of sulfur purification. Therefore, a more efficient sulfur purification method is urgently needed. Summary of the Invention

[0006] In response to the above problems, the present invention provides a sulfur purification method and device for sulfur-containing solid waste. When the purified liquid sulfur is cooled and sliced, the liquid sulfur to be cooled is always cooled by heat exchange with the newly input cooling medium (initial cooling liquid) with the lowest temperature during the initial cooling. This greatly improves the cooling rate of the liquid sulfur, thereby improving the processing efficiency of the cooling slices and reducing energy consumption.

[0007] To achieve the above object, the present invention provides the following technical solutions: A method for purifying sulfur from sulfur-containing solid waste comprises the following steps: Step a: firstly, the sulfur-containing solid waste is crushed and sieved, and the treated sulfur-containing solid waste is heated to melt at a heating temperature of 150° C.; Step b, performing solid-liquid separation on the melted sulfur-containing waste liquid to separate the sulfur-containing liquid and waste residue; Step c: The separated sulfur-containing liquid is heated in two stages, first heated to 250° C., and then heated to 350° C. for insulation. Step d, heating the sulfur-containing liquid mixture heated to 350° C. to 450° C. and performing a distillation purification process to separate sulfur vapor and sulfur-containing waste residue; Step e: condensing the distilled sulfur vapor to form liquid sulfur; Step f, after the liquid sulfur is cooled, it is sliced ​​and cut into solid sulfur for output; Wherein, in step f, when the liquid sulfur to be cooled is initially cooled, it always exchanges heat with the initial cooling liquid, and the initial cooling liquid is the cooling medium that initially participates in the cooling.

[0008] As an improvement, the sulfur-containing waste residue in step d is recycled to step b, mixed with the sulfur-containing liquid waste, and then solid-liquid separation is performed again.

[0009] In addition, the present invention also provides an apparatus for the sulfur purification method of the above-mentioned sulfur-containing solid waste, which comprises, in order of processing: Waste hopper, material conveyor, molten sulfur kettle, filtration equipment, buffer tank, first heating kettle, second heating kettle, distillation kettle, condenser, sulfur storage tank, slicer and conveyor belt; The waste hopper stores sulfur-containing solid waste particles, the lifting conveyor lifts the sulfur-containing solid waste particles and conveys them to the quantitative feeder on the top of the sulfur melting kettle, the sulfur melting kettle receives the sulfur-containing solid waste particles supplied by the waste hopper and heats and melts them, the filtering equipment filters the sulfur-containing waste liquid output by the sulfur melting kettle, the buffer tank buffers the separated sulfur-containing liquid, the first heating kettle and the second heating kettle perform two-stage heating treatment on the sulfur-containing liquid in turn, the distillation kettle performs distillation and purification treatment on the heated sulfur-containing liquid, the condenser water-cools the distilled sulfur vapor, the sulfur storage tank stores the cooled pure sulfur liquid, the slicer slices the pure sulfur liquid after cooling it to a solid, and the conveyor belt outputs the sliced ​​sulfur fragments.

[0010] As an improvement, the liquid outlet of the molten sulfur kettle and the feed inlet of the filtering device are connected through a first sulfur pump and a pipeline.

[0011] As an improvement, a slag storage tank for storing waste slag is provided below the slag outlet of the filtering device.

[0012] As an improvement, the waste residue outlet of the distillation kettle and the feed inlet of the filtering device are connected through a waste residue pump and a pipeline.

[0013] As an improvement, the liquid outlet of the sulfur storage tank is connected to the liquid inlet on the top of the slicer through a second sulfur pump and a pipeline.

[0014] As an improvement, the slicer includes a housing, a cooling drum, a cutter, a heating coil and a drive device; The top of the casing is provided with a liquid inlet, the bottom of the casing is provided with a liquid discharge port, the liquid discharge port is connected to the sulfur storage tank through a pipeline, and a discharge port is provided on one side of the casing; The cooling drum is rotatably disposed in the housing, a cooling channel for flowing a cooling medium is provided in the cooling drum, and the outer wall of the cooling drum is paved with pure sulfur liquid input from the liquid inlet; The cutter is arranged at the discharge port, the cutter is arranged to abut against the outer wall of the cooling drum, and the cutter scrapes off the pure sulfur solid on the cooling drum; The heating coil is arranged at the bottom of the housing, and a heating medium flows in the heating coil; The driving device is arranged outside the casing, and drives the cooling drum to roll.

[0015] As an improvement, the cooling drum includes a rotating shaft, an outer cylinder, an inner cylinder and a planetary gear set; The two ends of the rotating shaft are rotatably arranged on the housing, the rotating shaft is driven to rotate by the driving device, and the two ends of the rotating shaft are respectively provided with a cooling medium inlet and a cooling medium outlet connected to the cooling flow channel; The outer cylinder is sleeved on the rotating shaft, and the outer cylinder and the rotating shaft are connected through a planetary gear set, and the outer cylinder rotates in the opposite direction with the rotation of the rotating shaft; The inner cylinder is coaxially arranged inside the outer cylinder, and the inner cylinder cooperates with the inner side wall of the outer cylinder to form a cooling channel. A number of permanent magnets are provided at both ends of the inner cylinder, and magnets corresponding to the permanent magnets are fixedly mounted on the inner side wall of the casing. The magnets can be permanent magnets or electromagnets.

[0016] As an improvement, a plurality of partition plates are raised on the outer wall of the inner tube, which divide the cooling flow channel into a plurality of cooling zones located in the middle and liquid inlet zones and liquid outlet zones located at both ends. A liquid inlet pipe connecting the top of the cooling zone and the liquid inlet zone is provided at the top of the inner tube, and a liquid outlet pipe connecting the bottom of the cooling zone and the liquid outlet zone is provided at the top of the inner tube. A piston extrusion unit driven by the rotating shaft is provided on the liquid inlet pipe corresponding to each cooling zone, and the piston extrusion unit squeezes the cooling medium in the liquid inlet pipe into the cooling zone.

[0017] The beneficial effects of the present invention are: (1) The present invention greatly improves the cooling speed of the liquid sulfur and the processing efficiency of the cooling slices by making the liquid sulfur to be cooled always exchange heat with the newly input cooling medium (cooling initial liquid) with the lowest temperature during the initial cooling process when the purified liquid sulfur is cooled and sliced. It avoids the problem that some liquid sulfur cannot be solidified and sliced ​​due to cooling factors, greatly improves the solidification and slicing efficiency of the purified liquid, and reduces the residual liquid sulfur during cooling and slicing. (2) The present invention constructs a closed-loop circulation system of "distillation-separation-recycling" by recycling the sulfur-containing waste residue generated during the distillation process. By directional improvement of the sulfur content, the gas-liquid equilibrium conditions of the distillation process are optimized, and the interference of low-boiling point impurities is reduced. At the same time, due to the increase in the sulfur concentration in the system, the heat load required in the distillation process is reduced, thereby achieving dual optimization of energy consumption and efficiency; (3) The present invention forms a highly integrated closed-loop production system by intelligently transforming and automatically connecting the core equipment in the purification device, such as crushing, feeding, melting, filtration and separation, heating, distillation, condensation, and cooling and slicing. The entire purification device, from crushing and screening of sulfur-containing solid waste to impurity separation, sulfur element distillation and condensation, and finally to finished product collection, can achieve 24-hour continuous operation without human intervention; (4) The present invention constructs a set of efficient cooling modes with fixed cooling medium input and output by innovatively transforming the slicer, forming a cooling mode with fixed cooling medium input and output, so that when liquid sulfur is input from the liquid inlet on the top of the slicer and spread on the cooling drum, the cooling medium newly input into the slicer always maintains the lowest temperature and can timely and accurately contact the liquid sulfur spread on the cooling drum, which greatly improves the cooling speed of the liquid sulfur, shortens the cooling time, and thus achieves the shortest cooling path, so that the overall structural design of the slicer is optimized, and there is no need to set up a large volume to meet the longer cooling process like the traditional slicer.

[0018] In summary, the present invention has the advantages of high processing efficiency, energy saving, environmental protection, economy and practicality, and is particularly suitable for the technical field of recycling and processing of sulfur-containing solid waste, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the method flow of Example 1 of the present invention; Figure 2 This is a front view schematic diagram of the device of Example 2 of the present invention; Figure 3 This is a side structural diagram of a slicer according to embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of a slicer according to embodiment 2 of the present invention; Figure 5 This is a schematic cross-sectional structural diagram of a slicer according to embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the cooling drum in Example 2 of the present invention; Figure 7 Schematic diagram of the cross-sectional structure of the cooling drum in Example 2 of the present invention Figure 1 ; Figure 8 Schematic diagram of the cross-sectional structure of the cooling drum in Example 2 of the present invention Figure 2 ; Figure 9 This is a schematic diagram of the three-dimensional structure of the inner cylinder of Example 2 of the present invention; Figure 10 This is a schematic diagram of the internal structure of the outer cylinder of Example 3 of the present invention; Figure 11 This is a schematic diagram of the three-dimensional structure of the piston extrusion unit in Example 3 of the present invention.

[0020] Symbols in the drawings: waste hopper 1, material conveyor 2, molten sulfur kettle 3, first sulfur pump 31, filtering equipment 4, slag storage tank 41, buffer tank 5, third sulfur pump 51, first heating kettle 6, second heating kettle 7, distillation kettle 8, waste slag pump 81, condenser 9, sulfur storage tank 10, second sulfur pump 101, slicer 11, liquid inlet 110, casing 111, cooling drum 112, cooling channel 1120, cooling area 11201, liquid inlet area 11202, liquid outlet area 11203, rotating shaft 1121, cooling medium inlet 11211, cooling medium outlet 11212, outer cylinder 11 22, diversion baffle 11220, magnet 11221, diversion hole 11222, inner cylinder 1123, permanent magnet 11231, partition plate 11232, liquid inlet pipe 11233, liquid outlet pipe 11234, piston extrusion unit 11235, piston cylinder 11236, piston 11237, crank connecting rod 11238, crank 11239, planetary gear set 1124, central gear 11241, planetary gear 11242, ring gear 11243, cutter 113, heating coil 114, drive device 115, drain port 116, discharge port 117, conveyor belt 12. DETAILED DESCRIPTION

[0021] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0022] The specific embodiments of the present invention are described in detail below. However, it should be noted that the protection scope of the present invention is not limited by these specific embodiments, but is determined by the claims in the appendix.

[0023] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In the event of conflict, the definitions in this specification will prevail.

[0024] When this specification uses the prefix "well known to those skilled in the art", "prior art" or similar terms to introduce materials, substances, methods, steps, devices or components, the objects introduced by the prefix include those conventionally used in the art when the present invention was proposed, but also include those that are not commonly used at present but will become generally recognized in the art to be suitable for similar purposes.

[0025] It should be noted that two or more aspects (or implementation methods) disclosed in the context of this specification can be arbitrarily combined with each other, and the technical solutions (such as methods or systems) thus formed are part of the original disclosure of this specification and also fall within the scope of protection of the present invention.

[0026] Unless otherwise specified, all percentages, parts, ratios, etc. mentioned in this specification are based on weight, unless the weight basis does not conform to the general understanding of those skilled in the art.

[0027] Example 1: like Figure 1 As shown, a method for purifying sulfur from sulfur-containing solid waste comprises the following steps: Step a: Pre-treat sulfur-containing solid waste using a three-stage crushing and screening system: First, crush the lumpy solid waste to a particle size of ≤50mm using a jaw crusher, then crush it to ≤10mm using a cone crusher, and finally use a vibrating screen for particle size classification, requiring the undersize material to have a particle size of ≤2mm and a proportion of ≥95%. The screened material is conveyed to a jacketed melting reactor, where the temperature is controlled at 150±5°C using electric heating. This temperature setting is based on the physicochemical properties of elemental sulfur (melting point 115.21°C) and most metal sulfides. It ensures that the elemental sulfur is fully melted while avoiding the generation of harmful gases at high temperatures. The reactor is equipped with a stirring device with a speed controlled at 60r / min, ensuring uniform melting of the material within 90 minutes. Step b: The molten material (sulfur-containing waste liquid) is conveyed to a horizontal spiral centrifuge through a screw conveyor (the filtration and separation of the sulfur-containing waste liquid in this embodiment is not limited to the horizontal spiral centrifuge, and any equipment that meets the requirements of the filtration and separation of the sulfur-containing waste liquid in this application falls within the scope of protection of this application). The speed is set to 3000 r / min and the centrifugal field strength is 2000 G to achieve effective separation of the solid and liquid phases. The separated sulfur-containing liquid (sulfur content ≥ 65%) enters the intermediate buffer tank, and the waste residue (mainly containing silicates and metal oxides) is conveyed to the waste residue temporary storage area for subsequent stabilization treatment. The buffer tank is equipped with an electric heating and insulation device to maintain a temperature of 130°C to prevent the sulfur liquid from solidifying. At the same time, a liquid level sensor is configured for interlocking control with the first sulfur pump to ensure continuous feeding in subsequent work sections. Step c: The sulfur-containing liquid is subjected to a gradient heating treatment in two stages: the first stage uses a shell-and-tube heat exchanger with thermal oil as the heat medium to raise the material temperature to 250±3°C. This stage mainly removes low-boiling point impurities (such as water vapor and light hydrocarbons) and lasts for 40 minutes; the second stage is transferred to a thin film evaporator with a vacuum system, and the temperature is raised to 350°C under an absolute pressure of 10 kPa and maintained for 60 minutes. The vacuum environment lowers the boiling point of sulfur (the boiling point of sulfur is 444.6°C at atmospheric pressure) and simultaneously causes heavy metal sulfides to gradually precipitate at this temperature. During the holding period, a scraping device (rotating at 80 rpm) is activated to prevent scaling and enhance heat transfer efficiency. Step d: The material at 350°C is transferred to a distillation kettle via a plunger pump and subjected to a gradient temperature increase process: the temperature is first increased to 420°C within 30 minutes to decompose the polysulfides, and then the temperature is further increased to 450±2°C. At this time, the elemental sulfur is converted into sulfur vapor (molecular form) and enters the condensation system. The sulfur-containing waste residue (mainly metal sulfate) generated during the distillation process is regularly discharged from the bottom of the kettle, quenched by water, and then sent to step b for reuse; Step e: The sulfur vapor enters the tube condenser and adopts a staged condensation process: the cooling medium in the front stage is 120℃ thermal oil (to prevent direct solidification of sulfur vapor), so that the sulfur vapor is initially cooled to liquid sulfur (temperature is about 160℃); Step f: The initially cooled liquid sulfur is then transported to a drum-type cooling slicer. Cooling water circulates inside the drum of the device. The liquid sulfur is evenly spread on the drum surface under the action of gravity. Upon contact with the low-temperature drum, it solidifies rapidly into sulfur sheets with a thickness of about 3 mm in a very short time. Among them, in step f, when the liquid sulfur to be cooled is initially cooled after being transported to the drum-type cooling slicer, it always exchanges heat with the cooling medium (initial cooling liquid) newly input into the slicer which always maintains the lowest temperature.

[0028] It should be noted that, in the existing sulfur purification processing method, the purified sulfur liquid is mostly cooled and sliced ​​to achieve the purpose of rapid cooling, solidification, and slicing of the sulfur liquid for output. However, due to the limitations of the existing cooling and slicing technology, when the sulfur liquid is evenly spread on the surface of the drum under the action of gravity, it cannot be guaranteed that the sulfur liquid is always subjected to heat exchange cooling with the cooling initial liquid (the reason for this is that the drum inside the cooling and slicing equipment is always rotating, and the input port of the flow channel inside the drum is always in a changing state as the drum rotates). As a result, within the same cooling path and cooling time, part of the sulfur liquid can be cooled to solidification, while part of the sulfur liquid only solidifies on the surface. The conventional solution is to increase the diameter of the drum, extend the cooling path and cooling time of the sulfur on the drum, and thus ensure that the sulfur is completely solidified. This also leads to an increase in the volume of the cooling slicer and a decrease in processing efficiency.

[0029] Example 2: like Figure 2-Figure 9 As shown, this embodiment provides a device for the sulfur purification method of sulfur-containing solid waste described in Example 1, comprising a waste hopper 1, a material conveyor 2, a sulfur melting kettle 3, a filtering device 4, a buffer tank 5, a first heating kettle 6, a second heating kettle 7, a distillation kettle 8, a condenser 9, a sulfur storage tank 10, a slicer 11, and a conveyor belt 12; The waste hopper 1 stores sulfur-containing solid waste particles, and the lifting conveyor 2 lifts the sulfur-containing solid waste particles to the quantitative feeder on the top of the sulfur melting kettle 3. The sulfur melting kettle 3 receives the sulfur-containing solid waste particles supplied by the waste hopper 1 for heating and melting. The liquid outlet of the sulfur melting kettle 3 is connected to the feed port of the filtering device 4 through a first sulfur pump 31 and a pipeline. The filtering device 4 filters the sulfur-containing waste liquid output by the sulfur melting kettle 3. A slag storage tank 41 for storing waste slag is provided below the slag outlet of the filtering device 4. The buffer tank 5 buffers the separated sulfur-containing liquid. The buffer tank 5 is connected to the first temperature rising kettle 6 through a third sulfur pump 51 and a pipeline. The first temperature rising kettle 6 is connected to the first temperature rising kettle 6 through a third sulfur pump 51 and a pipeline. The warming kettle 6 and the second warming kettle 7 sequentially perform two-stage temperature raising treatment on the sulfur-containing liquid. The distillation kettle 8 performs distillation and purification treatment on the heated sulfur-containing liquid. The waste residue outlet of the distillation kettle 8 is connected to the feed port of the filtering device 4 via a waste residue pump 81 and a pipeline. The condenser 9 water-cools the distilled sulfur vapor. The sulfur storage tank 10 stores the cooled pure sulfur liquid. The liquid outlet of the sulfur storage tank 10 is connected to the liquid inlet 110 at the top of the slicer 11 via a second sulfur pump 101 and a pipeline. The slicer 11 slices the pure sulfur liquid after cooling it into a solid. The conveyor belt 12 outputs the sliced ​​sulfur fragments.

[0030] It should be noted that in Example 1, the structures of the molten sulfur kettle 3, the filtering equipment 4, the buffer tank 5, the first heating kettle 6, the second heating kettle 7, the distillation kettle 8 and the condenser 9 have been explained and will not be repeated here.

[0031] This embodiment focuses on the creative improvements of the present application for slicing. In some embodiments, as a preferred embodiment, the structure of the slicer 11 includes a housing 111, a cooling drum 112, a cutter 113, a heating coil 114 and a driving device 115; The top of the housing 111 is provided with a liquid inlet 110 for inputting liquid sulfur, and the bottom of the housing 111 is provided with a drain port 116 (for discharging the sulfur remaining inside the housing). The drain port 116 is connected to the sulfur storage tank 10 through a pipeline (the discharged sulfur is returned to the sulfur storage tank 10 and condensed again). A discharge port 117 is provided on one side of the housing 111 for discharging the solidified and cut solid sulfur. The cooling drum 112 is rotatably disposed in the housing 111. A cooling channel 1120 for flowing a cooling medium is provided in the cooling drum 112. The outer wall of the cooling drum 112 is paved with the pure sulfur liquid input from the liquid inlet 110. The cooling drum 112 rotates from the liquid inlet 110 to the discharge port 117. The cutter 113 is disposed at the discharge port 117 . The cutter 113 is disposed in contact with the outer wall of the cooling drum 112 , and the cutter 113 scrapes off the pure sulfur solids on the cooling drum 112 . The cutter 113 is disposed at an angle, with the top end contacting the cooling drum 112 and the bottom end being located at the discharge port 117 . The heating coil 114 is provided at the bottom of the housing 111. A heating medium flows in the heating coil 114. The function of the heating coil 114 is to melt the sulfur remaining in the housing 111 again for easy output and reuse. The driving device 115 is arranged outside the housing 111, and the driving device 115 drives the cooling drum 112 to roll. The driving device 115 adopts a motor and a belt transmission method.

[0032] In some embodiments, as preferred, the cooling drum 112 includes a rotating shaft 1121, an outer cylinder 1122, an inner cylinder 1123 and a planetary gear set 1124; Both ends of the rotating shaft 1121 are rotatably mounted on the housing 111. The rotating shaft 1121 is driven to rotate by the driving device 115. The two ends of the rotating shaft 1121 are respectively provided with a cooling medium inlet 11211 and a cooling medium outlet 11212 that are in communication with the cooling channel 1120. The cooling medium inlet 11211 and the cooling medium outlet 11212 are respectively connected to an external cooling water circulation system. The cooling water circulation system cools the cooling water after the heat exchange and then re-inputs it into the slicer to participate in the operation. The outer cylinder 1122 is sleeved on the rotating shaft 1121, and the outer cylinder 1122 and the rotating shaft 1121 are connected by a planetary gear set 1124. The outer cylinder 1122 rotates in the opposite direction as the rotating shaft 1121 rotates. The specific planetary gear set 1124 includes a central gear 11241, planetary gears 11242 and a ring gear 11243. The central gear 11241 is coaxially sleeved with the rotating shaft 1121, and the planetary gears 11242 are installed on the side wall of the housing 111. The planetary gears 11242 can rotate with the rotation of the central gear 11241, but the planetary gears 11242 rotate around the central gear 11241. The revolution freedom is locked, the ring gear 11243 is installed on the side wall of the outer cylinder 1122, and the ring gear 11243 is arranged around the planetary gear 11242. Therefore, the working process of the planetary gear set 1124 becomes the rotation of the rotating shaft 1121, which drives the central gear 11241 to rotate, and the central gear 11241 drives the planetary gear 11242 to rotate. Then, the planetary gear 11242 drives the ring gear 11243 to rotate coaxially with the central gear 11241 and in the opposite direction. That is, the outer cylinder 1122 and the rotating shaft 1121 rotate coaxially and in the opposite direction. The gear ratio of the central gear 11241 and the ring gear 11243 is 1:N, where N is a natural integer other than 0. The inner cylinder 1123 is coaxially arranged inside the outer cylinder 1122. The inner cylinder 1123 cooperates with the inner side wall of the outer cylinder 1122 to form a cooling channel 1120, and a plurality of permanent magnets 11231 are provided at both ends of the inner cylinder 1123. A magnet 11221 corresponding to the permanent magnet 11231 is fixedly mounted on the inner side wall of the casing 111 (as a non-limiting embodiment of the magnet 11221, the magnet 11221 can be a permanent magnet or an electromagnet). The rotational freedom of the inner cylinder 1123 is locked by the magnetic attraction between the permanent magnet 11231 and the magnet 11221, so that the inner cylinder is in a fixed state relative to the outer cylinder. Since the inner cylinder 1123 is fixed, and a plurality of partition plates 11232 are raised on the outer side wall of the inner cylinder 1123, the partition plates 11232 divide the cooling channel 1120 into a plurality of cooling channels located in the middle. The top of the inner tube 1123 is provided with a liquid inlet pipe 11233 connecting the top of the cooling zone 11201 and the liquid inlet zone 11202, and the top of the inner tube 1123 is provided with a liquid outlet pipe 11234 connecting the bottom of the cooling zone 11201 and the liquid outlet zone 11203. With the flow channel 1120 fixed, the circulating cooling water flows from the cooling medium inlet 11211 to the liquid inlet area 11202, and then enters the cooling area 11201 through the liquid inlet pipe 11233. The cooling water in the cooling area 11201 flows to the liquid outlet pipe 11234, reaches the liquid outlet area 11203 through the liquid outlet pipe 11234, and is finally discharged outward through the cooling medium outlet 11212 through the liquid outlet area 11203, thereby completing the cycle.

[0033] Example 3: like Figure 7 、 10As shown in Figure 11, in some preferred embodiments, since the liquid inlet pipe 11233 needs to transport the cooling water to the top of the outer cylinder, thereby forming an effect of heat exchange between the sulfur liquid just laid on the outer wall of the outer cylinder and the latest input cooling water with the lowest temperature, this also leads to the liquid inlet pipe 11233 can only rely on the pumping pressure of the cooling water to press the cooling water into the cooling zone 11201, forming a problem of difficult cooling water flow. Therefore, the innovative liquid inlet pipe 11233 is provided with a piston extrusion unit 11235 driven by the rotating shaft 1121 corresponding to each cooling zone 11201, and the piston extrusion unit 11235 squeezes the cooling medium in the liquid inlet pipe 11233 into the cooling zone 11201. Specifically, the piston extrusion unit 11235 consists of a piston cylinder 11236 and a piston 11237, a crank-connecting rod 11238 and a crank 11239. The piston cylinder 11236 is arranged below the liquid inlet pipe 11233 and is connected to the liquid inlet pipe 11233. The piston 11237 is slidably arranged in the piston cylinder 11236. The crank-connecting rod 11238 is hinged below the piston 11237, and the crank 11239 is arranged on the rotating shaft 1121. The crank-connecting rod 11238 is hinged to the crank 11239. As the rotating shaft 1121 rotates, the piston extrusion unit 11235 continuously pushes, squeezes and transports the cooling water in the liquid inlet pipe 11233 to the corresponding cooling zone 11201. At the same time, with the pumping pressure of the liquid inlet pipe 11233 itself, the effect of quickly transporting cooling water to the cooling zone 11201 is achieved, thereby ensuring the fluidity of the cooling water in the cooling zone 11201.

[0034] Furthermore, a guide baffle 11220 is protruding from the inner wall of the outer tube 1122 into the cooling zone 11201, and a guide hole 11222 is provided at the root where the guide baffle 11220 is connected to the outer tube 1122, so that the cooling water in the cooling zone 11201 first flows along the inner wall of the cooling zone 11201 close to the outer tube 1122, thereby ensuring the cooling temperature on the outer tube 1122 and further improving the cooling speed on the outer tube 1122.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for purifying sulfur from sulfur-containing solid waste, characterized in that: The following steps are involved: Step a: firstly, the sulfur-containing solid waste is crushed and sieved, and the treated sulfur-containing solid waste is heated to melt at a heating temperature of 150° C.; Step b, performing solid-liquid separation on the melted sulfur-containing waste liquid to separate the sulfur-containing liquid and waste residue; Step c: The separated sulfur-containing liquid is heated in two stages, first heated to 250° C., and then heated to 350° C. for insulation. Step d, heating the sulfur-containing liquid mixture heated to 350° C. to 450° C. and performing a distillation purification process to separate sulfur vapor and sulfur-containing waste residue; Step e: condensing the distilled sulfur vapor to form liquid sulfur; Step f, after the liquid sulfur is cooled, it is sliced ​​and cut into solid sulfur for output; Wherein, in step f, when the liquid sulfur to be cooled is initially cooled, it always exchanges heat with the initial cooling liquid, and the initial cooling liquid is the cooling medium that initially participates in the cooling.

2. The method for purifying sulfur from sulfur-containing solid waste according to claim 1, wherein: The sulfur-containing waste residue in step d is recycled to step b, mixed with the sulfur-containing liquid waste, and then solid-liquid separation is performed again.

3. The device used in the sulfur purification method of sulfur-containing solid waste according to any one of claims 1 to 2, characterized in that: In order of processing, they include: Waste hopper (1), material conveyor (2), molten sulfur kettle (3), filtering equipment (4), buffer tank (5), first heating kettle (6), second heating kettle (7), distillation kettle (8), condenser (9), sulfur storage tank (10), slicer (11) and conveyor belt (12); The waste hopper (1) stores sulfur-containing solid waste particles, the lifting conveyor (2) lifts the sulfur-containing solid waste particles and conveys them to the quantitative feeder on the top of the sulfur melting kettle (3), the sulfur melting kettle (3) receives the sulfur-containing solid waste particles supplied by the waste hopper (1) and heats and melts them, the filtering device (4) filters the sulfur-containing waste liquid output by the sulfur melting kettle (3), the buffer tank (5) buffers the separated sulfur-containing liquid, the first heating kettle (6) and the second heating kettle (7) sequentially perform two-stage heating treatment on the sulfur-containing liquid, the distillation kettle (8) performs distillation and purification treatment on the heated sulfur-containing liquid, the condenser (9) water-cools the sulfur vapor after distillation, the sulfur storage tank (10) stores the cooled pure sulfur liquid, the slicer (11) slices the pure sulfur liquid after cooling it into a solid, and the conveyor belt (12) outputs the sliced ​​sulfur fragments.

4. The device according to claim 3, characterized in that: The liquid outlet of the molten sulfur kettle (3) and the feed inlet of the filtering device (4) are connected via a first sulfur pump (31) and a matching pipeline.

5. The device according to claim 3, characterized in that A slag storage tank (41) for storing waste slag is provided below the slag outlet of the filtering device (4).

6. The device according to claim 3, characterized in that: The waste residue outlet of the distillation kettle (8) and the feed inlet of the filtering device (4) are connected via a waste residue pump (81) and a pipeline.

7. The device according to claim 3, characterized in that: The liquid outlet of the sulfur storage tank (10) and the liquid inlet (110) at the top of the slicer (11) are communicated with each other through a second sulfur pump (101) and a pipeline.

8. The device according to claim 7, characterized in that: The slicer (11) comprises a housing (111), a cooling drum (112), a cutter (113), a heating coil (114), and a driving device (115); The top of the housing (111) is provided with a liquid inlet (110), the bottom of the housing (111) is provided with a liquid discharge port (116), the liquid discharge port (116) is connected to the sulfur storage tank (10) through a pipeline, and a discharge port (117) is provided on one side of the housing (111); The cooling drum (112) is rotatably disposed in the housing (111), a cooling flow channel (1120) for flowing a cooling medium is provided in the cooling drum (112), and the outer wall of the cooling drum (112) is paved with pure sulfur liquid input from the liquid inlet (110); The cutter (113) is arranged at the discharge port (117), the cutter (113) is arranged to abut against the outer wall of the cooling drum (112), and the cutter (113) scrapes off the pure sulfur solid on the cooling drum (112); The heating coil (114) is arranged at the bottom of the housing (111), and a heating medium flows in the heating coil (114); The driving device (115) is arranged outside the housing (111), and the driving device (115) drives the cooling drum (112) to roll.

9. The device according to claim 8, characterized in that: The cooling drum (112) includes a rotating shaft (1121), an outer drum (1122), an inner drum (1123), and a planetary gear set (1124); Both ends of the rotating shaft (1121) are rotatably mounted on the housing (111); the rotating shaft (1121) is driven to rotate by the driving device (115); and both ends of the rotating shaft (1121) are respectively provided with a cooling medium inlet (11211) and a cooling medium outlet (11212) that are in communication with the cooling channel (1120); The outer cylinder (1122) is sleeved on the rotating shaft (1121), and the outer cylinder (1122) and the rotating shaft (1121) are connected to each other through a planetary gear set (1124), and the outer cylinder (1122) rotates in the opposite direction as the rotating shaft (1121) rotates. The inner cylinder (1123) is coaxially arranged inside the outer cylinder (1122), and the inner cylinder (1123) cooperates with the inner wall of the outer cylinder (1122) to form a cooling channel (1120), and a plurality of permanent magnets (11231) are provided at both ends of the inner cylinder (1123), and magnets (11221) corresponding to the permanent magnets (11231) are fixedly installed on the inner wall of the casing (111).

10. The device according to claim 9, characterized in that: A plurality of partition plates (11232) are protruded from the outer wall of the inner cylinder (1123), and the partition plates (11232) divide the cooling channel (1120) into a plurality of cooling zones (11201) located in the middle and a liquid inlet zone (11202) and a liquid outlet zone (11203) located at both ends; a liquid inlet pipe (11233) connecting the top of the cooling zone (11201) and the liquid inlet zone (11202) is provided at the top of the inner cylinder (1123); and a liquid outlet pipe (11234) connecting the bottom of the cooling zone (11201) and the liquid outlet zone (11203) is provided at the top of the inner cylinder (1123); A piston extrusion unit (11235) driven by the rotating shaft (1121) is provided on the liquid inlet pipe (11233) corresponding to each cooling zone (11201), and the piston extrusion unit (11235) squeezes the cooling medium in the liquid inlet pipe (11233) into the cooling zone (11201).

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