Zinc solution purification device and metal zinc smelting process

Abstract

The invention relates to the field of zinc solution purification, and discloses a zinc solution purification device and a metal zinc smelting technology.The zinc solution purification device comprises a frame and an oxygen pressure leaching tank, a first treatment box is fixedly connected to the left side of the top wall of the frame, an alkaline washing tank is formed in the rear side of the interior of the first treatment box, and filter pressing equipment is fixedly connected to the middle of the top wall of the frame; a crystallization tank is formed in the front side of the interior of the first treatment box, an evaporator is fixedly connected to the inner bottom wall of the crystallization tank, a second treatment box is fixedly connected to the right side of the top wall of the frame, and a neutral immersion tank is formed in the left side of the interior of the second treatment box. High-pressure airflow is conveyed through the conveying pipe, then the airflow enters the neutral leaching tank, stirring blades in the neutral leaching tank are driven, dechlorinated secondary zinc oxide in the neutral leaching tank reacts with waste electrodeposition liquid, airflow in the other path is output through the annular spray head, the airflow and waste electrolyte are heated through high-pressure steam, and the reaction rate is further increased.

Description

Technical Field

[0001] The present invention relates to the technical field of zinc solution purification, and particularly to a zinc solution purification device and a metal zinc smelting process. Background Art

[0002] Zinc solution purification is mainly to remove impurities in the solution. In the production process of zinc, whether it is zinc sulfate solution obtained by hydrometallurgy or other zinc-containing solutions, they all contain various impurities, such as metal impurities of copper, cadmium, cobalt or nickel, and non-metal impurities such as arsenic, antimony or germanium. These impurities will affect the electrolytic deposition process of zinc, reduce the quality of zinc and the current efficiency. By purifying the zinc solution, the purity and quality of zinc products can be improved, the smooth progress of the electrolytic zinc process can be ensured, the current efficiency can be increased, and energy consumption and production costs can be reduced.

[0003] The existing purification device uses a filter plate to filter impurities in the zinc liquid. After long-term use, impurities are likely to block the filter plate, resulting in a reduction in the filtration area, a slowdown in the filtration speed of the zinc liquid, and a decrease in work efficiency. The current solution is to deeply study the effects of process parameters such as the concentration of each ion in the zinc liquid, solution temperature, and pH value on the redox potential and chemical reaction rate, establish a parallel-series dynamic reaction model based on the redox potential, and through this model, achieve coordinated and optimized control of zinc powder in each impurity removal reactor, accurately control the amount of zinc powder added, and reduce zinc powder consumption. However, in actual use, there is an uneven situation when heating and stirring the zinc liquid by this device. The zinc liquid near the heating block is heated first, and the zinc liquid far from the heating block is heated slowly, affecting the purification effect and work efficiency. Therefore, a zinc solution purification device and a metal zinc smelting process are proposed to solve the above problems. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a zinc solution purification device and a metal zinc smelting process, which solve the problem that the current uneven heating and stirring of the zinc liquid affect the purification effect and work efficiency.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A zinc solution purification device and a metallic zinc smelting process, including a frame and an oxygen pressure leaching tank. The left side of the top wall of the frame is fixedly connected with a first treatment box. A caustic washing tank is provided at the rear side inside the first treatment box. The middle part of the top wall of the frame is fixedly connected with a pressure filtration device. A crystallization tank is provided at the front side inside the first treatment box. An evaporator is fixedly connected to the inner bottom wall of the crystallization tank. The right side of the top wall of the frame is fixedly connected with a second treatment box. A medium leaching tank is provided at the left side inside the second treatment box. A rotating column is rotatably connected to the left side inner wall of the second treatment box. A plurality of stirring blades are fixedly connected to the outer wall of the rotating column. A variable frequency blower is fixedly connected to the inner top wall of the frame. The right end of the variable frequency blower is communicated with a conveying pipe. A shunt pipe is communicated with the middle part of the conveying pipe. The top end of the shunt pipe is communicated with the medium leaching tank. The right end of the conveying pipe is communicated with an annular spray head. The bottom wall of the annular spray head is fixedly connected to the inner bottom wall of the oxygen pressure leaching tank. Two filter plates are fixedly connected to the inner wall of the oxygen pressure leaching tank. An acid leaching assembly is arranged on the right side of the second treatment box. Fixing mechanisms are arranged on both the front and rear sides of the frame. A filtering mechanism is arranged on the top of the oxygen pressure leaching tank.

[0006] Preferably, the fixing mechanism includes two connecting plates. One side of each of the two connecting plates is fixedly connected to the front and rear sides of the frame respectively. A vertical plate is fixedly connected to the top wall of the connecting plate. A swing cylinder is fixedly connected to the right side of the vertical plate. The left end of the swing cylinder is fixedly connected to a rotating shell. A connecting rod is fixedly connected to the top of the rotating shell. The top end of the connecting rod is rotatably connected with a clamping plate through a torsion spring. Two clamping teeth are fixedly connected to both the left and right sides of the clamping plate. A plurality of clamping grooves are provided on both the front and rear sides of the oxygen pressure leaching tank. One side of each of the plurality of clamping teeth is respectively engaged with the corresponding clamping groove.

[0007] Preferably, the filtering mechanism includes an annular valve. The outer wall of the annular valve is fixedly installed on the top inner wall of the oxygen pressure leaching tank. A filtering shell is fixedly connected to the top wall of the annular valve. Adsorption carbon plates are slidably connected to the bottom parts of both the front and rear sides of the filtering shell. A plurality of filter columns are communicated with the middle parts of both the front and rear sides of the filtering shell. A filter disc is fixedly connected to one side of the filter column.

[0008] Preferably, the acid leaching assembly includes an injection pipe. The left end of the injection pipe is communicated with the right side of the second treatment box. An acid leaching tank is provided at the right side inside the second treatment box. The right end of the injection pipe is communicated with the left side of the oxygen pressure leaching tank. A heater is fixedly connected to the left side inner wall of the acid leaching tank. The bottom wall of the annular spray head is fixedly connected to the inner bottom wall of the oxygen pressure leaching tank. Solenoid valves are communicated with both the front and rear sides of the first treatment box and the front side of the second treatment box. A high-pressure steam injection valve is communicated with the right side of the oxygen pressure leaching tank. A condensing pipe is communicated with the top wall of the pressure filtration device. The left end of the condensing pipe is communicated with the caustic washing tank.

[0009] Preferably, the fixing mechanism further includes two rubber plates, and one sides of the two rubber plates are respectively fixedly connected to one side of the clamping plate.

[0010] Preferably, the filtering mechanism further includes a plurality of rubber rings, and the plurality of rubber rings are respectively fixedly connected to the other side of the filtering column.

[0011] Preferably, a sealing ring is fixedly installed at the left end of the outer wall of the high-pressure steam injection valve, and the outside of the sealing ring is fixedly connected to the right side of the oxygen pressure leaching tank.

[0012] Preferably, a control switch is fixedly connected to the left side of the frame, and the control switch is electrically connected to the pressure filter equipment, the evaporator, the variable-frequency blower, the solenoid valve and the swing cylinder respectively.

[0013] Preferably, a rubber pad is fixedly connected to the right end of the outer wall of the delivery pipe, and a rubber ring is fixedly connected to the bottom end of the outer wall of the condenser pipe.

[0014] Preferably, two connecting seats are fixedly connected to both the left and right sides of the frame, and an installation groove is formed in the top wall of the connecting seat.

[0015] Medical zinc metal smelting process, comprising the following steps: S1. The zinc oxide raw materials are sampled and tested, divided into high-chlorine secondary zinc oxide and low-chlorine secondary zinc oxide. Subsequently, the high-chlorine secondary zinc oxide is wet-milled and slurried by a ball mill, and caustic soda is added in proportion and stirred. After reacting for a period of time, it is subjected to alkali washing and dechlorination through an alkali washing tank 5, and after alkali washing, it is filtered by a pressure filter equipment 6, and the slag enters the leaching process; S2. Sodium sulfide and thallium remover are added to the alkali washing solution for impurity removal and then filtered again. The filtrate is added into a crystallization tank and concentrated and crystallized by an evaporator. At the same time, sodium chloride and potassium chloride are separated by the different solubility of sodium chloride and potassium chloride with the change of temperature. The condensed water generated by evaporation is recycled to the inside of the alkali washing tank through the pressure filter equipment; S3. The dechlorinated secondary zinc oxide is added into the medium leaching tank. By starting the variable-frequency blower, high-pressure air flow is conveyed through the delivery pipe, and then under the diversion of the diversion pipe, the air flow enters the inside of the medium leaching tank respectively. Then, the stirring blades in the medium leaching tank are driven and rotate synchronously with the rotating column to react with the dechlorinated spent electrolyte solution in the medium leaching tank; S3. Meanwhile, temperature control is completed through the heater. Subsequently, the neutral leaching slurry is separated by a pressure filtration device again to obtain the intermediate leaching solution. The neutral leaching slurry is separated by the pressure filtration device to obtain the intermediate leaching solution. The intermediate leaching residue is leached with a solution to increase the leaching rate of zinc and extract valuable metal elements in the residue. After acid leaching and pressure filtration, the filter residue is the acid leaching residue for further leaching. The acid leaching residue is slurried and put into a sealed oxygen pressure leaching tank, and waste electrolyte is added. High-pressure steam is injected through a high-pressure steam injection valve to achieve the purpose of heating. At the same time, the air flow conveyed by another path is output through an annular nozzle, so that the waste electrolyte after the acid leaching residue is slurried is heated by high-pressure steam; S4. Subsequently, there is a small amount of divalent iron in the intermediate leaching solution. Oxygen or hydrogen peroxide is introduced to oxidize it to trivalent iron. Part of manganese dioxide and activated carbon are added to make the iron meet the goethite condition to form goethite precipitate and adsorb arsenic and antimony. The activated carbon adsorbs trace organic substances in the solution. After pressure filtration, the filtrate is sent to the next process; S5. For copper slag dechlorination, copper and cupric ions react with chloride ions in the solution to form insoluble precipitates. Then the slag is regenerated and returned for dechlorination. Zinc powder is added to displace the excessive copper element in the solution. The purification effect of the zinc solution is achieved through iron and organic matter removal, copper salt dechlorination, copper salt regeneration, and pickling of dechlorination slag.

[0016] The present invention provides a zinc solution purification device and a metal zinc smelting process. It has the following beneficial effects: 1. By starting the variable-frequency fan in the present invention, high-pressure air flow is conveyed through a conveying pipe. Then, under the diversion of a diversion pipe, the air flow enters the interior of the intermediate leaching tank respectively, so that the stirring blades inside are driven, and thus rotate synchronously with the rotating column, achieving the reaction of the secondary zinc oxide after dechlorination and the waste electrolyte solution in the intermediate leaching tank. Meanwhile, temperature control is completed through the heater. Subsequently, the neutral leaching slurry is separated by a pressure filtration device again to obtain the intermediate leaching solution. The air flow of another path is output through an annular nozzle, so that the waste electrolyte after the acid leaching residue is slurried is heated by high-pressure steam, further improving the reaction rate, avoiding the situation that affects the purification effect, and improving the work efficiency.

[0017] 2. Driven by a swing cylinder in the present invention, two rotating shells drive a connecting rod to swing. Thus, under the connection of the connecting rod, the clamping plates rotationally connected by torsion springs rotate towards one side of the oxygen pressure leaching tank together, achieving the protection of both sides of the oxygen pressure leaching tank. At the same time, a plurality of engaging teeth and a plurality of engaging grooves are engaged, further improving the clamping effect on the oxygen pressure leaching tank and ensuring its stability.

[0018] 3. By opening the annular valve in the present invention, the waste gas generated by the oxygen pressure leaching tank enters the interior of the filter shell through the annular valve. Then, under the filtration and adsorption of the adsorption carbon plate, the preliminary waste gas filtration effect is completed. Secondly, under the further filtration of the filter column and the filter disc, the harmful substances contained in the discharged gas are reduced, ensuring the protection of the surrounding environment. Description of the Drawings

[0019] Figure 1 is a perspective view of the present invention; Figure 2 is a front view of the present invention; Figure 3 is a top view of the present invention; Figure 4 is an exploded view of the stirring blade of the present invention; Figure 5 is a cross-sectional view of the oxygen pressure leaching tank of the present invention; Figure 6 is a side view of the present invention; Figure 7 is an exploded view of the fixing mechanism of the present invention; Figure 8 is a cross-sectional view of the filtering mechanism of the present invention.

[0020] Wherein, 1, frame; 2, fixing mechanism; 201, connecting plate; 202, vertical plate; 203, swing cylinder; 204, rotating shell; 205, connecting rod; 206, clamping plate; 207, engaging tooth; 208, engaging groove; 209, rubber plate; 3, filtering mechanism; 301, annular valve; 302, filtering shell; 303, adsorption carbon plate; 304, filtering column; 305, filtering disc; 306, rubber ring; 4, treatment tank one; 5, alkali washing tank; 6, pressure filtration equipment; 7, crystallization tank; 8, evaporator; 9, condensing pipe; 10, treatment tank two; 11, intermediate leaching tank; 12, rotating column; 13, stirring blade; 14, variable frequency blower; 15, conveying pipe; 16, shunt pipe; 17, rubber pad; 18, solenoid valve; 19, injection pipe; 20, annular spray head; 21, oxygen pressure leaching tank; 22, filter plate; 23, rubber ring; 24, control switch; 25, connecting seat; 26, installation groove; 27, high-pressure steam injection valve; 28, acid leaching tank; 29, heater; 30, sealing ring. Detailed embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to the attached Figure 1 and the attached Figure 4 and the attached Figure 5, an embodiment of the present invention provides a zinc solution purification device and a metal zinc smelting process, including a frame 1 and an oxygen pressure leaching tank 21. A first treatment tank 4 is fixedly connected to the left side of the top wall of the frame 1. A caustic washing tank 5 is provided at the rear side inside the first treatment tank 4. Through the first treatment tank 4, the caustic washing and evaporation crystallization operations of the solution are completed. A pressure filtration device 6 is fixedly connected to the middle of the top wall of the frame 1. A crystallization tank 7 is provided at the front side inside the first treatment tank 4. An evaporator 8 is fixedly connected to the inner bottom wall of the crystallization tank 7. Under the activation of the evaporator 8, the evaporation of the filtrate after impurity removal is completed, thereby achieving the purpose of concentration and crystallization. At the same time, sodium chloride and potassium chloride are separated by the different effects of the solubility of sodium chloride and potassium chloride with temperature change. A second treatment tank 10 is fixedly connected to the right side of the top wall of the frame 1. A medium leaching tank 11 is provided at the left side inside the second treatment tank 10. Through the medium leaching tank 11, a neutral leaching slurry is completed to obtain a medium leaching solution and enter the next process. The medium leaching residue is collected and sent to the acid leaching process for use. A rotating column 12 is rotatably connected to the left inner wall of the second treatment tank 10. A plurality of stirring blades 13 are fixedly connected to the outer wall of the rotating column 12. A variable frequency blower 14 is fixedly connected to the inner top wall of the frame 1. The right end of the variable frequency blower 14 is communicated with a conveying pipe 15. A shunt pipe 16 is communicated with the middle of the conveying pipe 15. Under the activation of the variable frequency blower 14, air flow enters the inside of the medium leaching tank 11 through the shunt pipe 16, achieving the purpose of driving the rotation of the stirring blades 13 and the rotating column 12, thereby improving the rate of the stirring and mixing reaction. The top end of the shunt pipe 16 is communicated with the medium leaching tank 11. The right end of the conveying pipe 15 is communicated with an annular spray head 20. The bottom wall of the annular spray head 20 is fixedly connected to the inner bottom wall of the oxygen pressure leaching tank 21. At the same time, another path of air flow is conveyed through the annular spray head 20, achieving an increase in the oxygen pressure reaction inside the oxygen pressure leaching tank 21 and accelerating the reaction process. Two filter plates 22 are fixedly connected to the inner wall of the oxygen pressure leaching tank 21. An acid leaching assembly is provided on the right side of the second treatment tank 10. Fixed mechanisms 2 are provided on both the front and rear sides of the frame 1. A filtering mechanism 3 is provided on the top of the oxygen pressure leaching tank 21; The acid leaching assembly includes an injection pipe 19. The left end of the injection pipe 19 is communicated with the right side of the second treatment tank 10. An acid leaching tank 28 is provided at the right side inside the second treatment tank 10. The right end of the injection pipe 19 is communicated with the left side of the oxygen pressure leaching tank 21. Through the injection pipe 19, the connection of the oxygen pressure leaching tank 21 is completed. A heater 29 is fixedly connected to the left inner wall of the acid leaching tank 28. Through the operation of the heater 29, the temperature inside the acid leaching tank 28 is ensured to be constant. The bottom wall of the annular spray head 20 is fixedly connected to the inner bottom wall of the oxygen pressure leaching tank 21. Solenoid valves 18 are communicated with the front and rear sides of the first treatment tank 4 and the front side of the second treatment tank 10. Through a plurality of solenoid valves 18, the operations of discharging and entering liquid are completed. A high-pressure steam injection valve 27 is communicated with the right side of the oxygen pressure leaching tank 21. A condensing pipe 9 is communicated with the top wall of the pressure filtration device 6. The left end of the condensing pipe 9 is connected to the caustic washing tank 5. Through the setting of the condensing pipe 9, the condensed water is completed to flow back into the inside of the caustic washing tank 5;The filtering mechanism 3 further includes a plurality of rubber rings 306, and the plurality of rubber rings 306 are respectively fixedly connected to the other side of the filter column 304.;

[0023] In the present invention, during the sampling and testing of the zinc suboxide raw material, it is first divided into two types: high-chloride zinc suboxide and low-chloride zinc suboxide. Next, the high-chloride zinc suboxide is subjected to wet ball milling slurry treatment by a ball mill. After the treatment, caustic soda flakes are added in a certain proportion and fully stirred to ensure that the reaction can proceed smoothly. After a period of reaction, the mixture is sent to the alkali washing tank 5 for alkali washing and dechlorination treatment. After the alkali washing is completed, the filter press 6 is used for filter pressing to separate the slag, and the slag enters the leaching process, and sodium sulfide and thallium removal agent are added to the alkali washing liquid for impurity removal treatment, and then the filter press 6 is used again for filter pressing to ensure that impurities are effectively removed. The filtrate is then sent to In the crystallization tank 7, the concentration and crystallization process is completed by the evaporator 8. The difference in solubility of sodium chloride and potassium chloride at different temperatures is used to separate sodium chloride and potassium chloride. The condensed water generated during the evaporation process will be recovered and reused in the alkali washing tank 5 through the condenser 9 to achieve the recycling of resources. The zinc oxide after dechlorination will be added to the middle immersion tank 11. By starting the variable frequency fan 14, the high-pressure airflow is transported to the diversion pipe 16 through the delivery pipe 15. The diverted airflow enters the middle immersion tank 11 respectively, driving the stirring blade 13 and the rotating column 12 to rotate synchronously, so as to react the waste electrolyte after dechlorination in the middle immersion tank 11. At the same time, the temperature is controlled by the heater 29. The reaction is completed. After that, the neutral leaching slurry is separated again by the filter press equipment 6 to obtain the intermediate leaching solution, and the intermediate leaching residue is further leached with a specific solution to increase the leaching rate of zinc and extract the valuable metal elements in the residue. The filter press residue after acid leaching will be further leached. After the acid leaching residue is slurried, it is put into the sealed oxygen pressure leaching tank 21, and the waste electrolyte is added. High-pressure steam is injected through the high-pressure steam injection valve 27 to achieve the purpose of heating. At the same time, the conveying air flow of another path is output through the annular nozzle 20, so that the waste electrolyte after the acid leaching residue is slurried is heated by high-pressure steam, thereby further improving the reaction rate and effectively avoiding the situation that affects the purification effect. Subsequently, a small amount of divalent iron contained in the intermediate leaching solution will be heated by flushing with oxygen or hydrogen peroxide. The formula is oxidized to trivalent iron, and part of manganese dioxide and activated carbon will be added to make the iron meet the conditions of goethite, forming goethite precipitation and adsorbing harmful elements of arsenic and antimony. The activated carbon will also adsorb trace organic matter in the solution. The filtrate obtained after filter pressing will be sent to the next process. As for the dechlorination of copper slag, copper and divalent copper ions will be used to react with chloride ions in the solution to form insoluble precipitates, and then the slag will be regenerated and returned to the system for dechlorination. Finally, zinc powder will be added to replace the excess copper element in the solution. Through the steps of iron removal, organic matter removal, copper salt dechlorination and copper salt regeneration and dechlorination slag pickling, the purification of the zinc solution is completed to ensure the purity and quality of the zinc solution. Through multiple rubber rings 306, the other side of the filter column 304 is protected.

[0024] Please see attached Figure 1 , AttachmentFigure 2 and the attached Figure 7 , the fixing mechanism 2 includes two connecting plates 201. One side of each of the two connecting plates 201 is fixedly connected to the front and rear sides of the frame 1 respectively. A vertical plate 202 is fixedly connected to the top wall of the connecting plate 201. A swing cylinder 203 is fixedly connected to the right side of the vertical plate 202. The left end of the swing cylinder 203 is fixedly connected to a rotating shell 204, so that under the drive of the swing cylinder 203, the rotating shell 204 rotates synchronously. A connecting rod 205 is fixedly connected to the top of the rotating shell 204. The top end of the connecting rod 205 is rotatably connected to a clamping plate 206 through a torsion spring. Furthermore, the clamping plate 206 rotatably connected to the connecting rod 205 and the torsion spring swings synchronously, so as to achieve the effect of clamping and protecting the outer wall of the oxygen pressure leaching tank 21. Two engaging teeth 207 are fixedly connected to both the left and right sides of the clamping plate 206. A plurality of engaging grooves 208 are provided on both the front and rear sides of the oxygen pressure leaching tank 21. One side of each of the plurality of engaging teeth 207 is engaged with the corresponding engaging groove 208. At the same time, when the engaging teeth 207 and the engaging grooves 208 are engaged, the engaging and clamping effect is improved, and the service life of the oxygen pressure leaching tank 21 is guaranteed; the fixing mechanism 2 further includes two rubber plates 209. One side of each of the two rubber plates 209 is fixedly connected to one side of the clamping plate 206.

[0025] In the present invention, by activating the swing cylinder 203, the coordinated movement of the two rotating shells 204 is realized, and then the connecting rod 205 is driven to perform a swinging action. Driven by the connecting rod 205 and through the rotational action of the torsion spring, the connected clamping plate 206 can rotate synchronously towards one side of the oxygen pressure leaching tank 21. When the clamping plate 206 is attached to and clamps the oxygen pressure leaching tank 21, the protection of both sides of the oxygen pressure leaching tank 21 can be realized. The plurality of engaging teeth 207 cooperate with the corresponding plurality of engaging grooves 208 to complete the engaging connection, so that the engaging connection effect between the clamping plate 206 and the oxygen pressure leaching tank 21 is enhanced, and the stability of the overall structure is ensured. Furthermore, the service life of the oxygen pressure leaching tank 21 is improved. The protection effect on the outer wall of the oxygen pressure leaching tank 21 is improved through the rubber plate 209, and the abrasion of the clamping plate 206 on the oxygen pressure leaching tank 21 is reduced.

[0026] Please refer to the attached Figure 1 , attached Figure 2 and attached Figure 8, the filtering mechanism 3 includes an annular valve 301. The outer wall of the annular valve 301 is fixedly installed at the top of the inner wall of the oxygen pressure leaching tank 21. The passage of waste gas is completed by opening and closing the annular valve 301. The top wall of the annular valve 301 is fixedly connected with a filtering shell 302. Adsorption carbon plates 303 are slidably connected to the bottom of the front and rear sides of the filtering shell 302. Thus, the waste gas is preliminarily filtered through the adsorption carbon plates 303. A plurality of filtering columns 304 are communicated with the middle of the front and rear sides of the filtering shell 302. A filtering disc 305 is fixedly connected to one side of the filtering column 304. Subsequently, the gas is purified and discharged under the filtration of the filtering columns 304 and the filtering plates 305.

[0027] In the present invention, by operating the opening of the annular valve 301, the waste gas generated by the oxygen pressure leaching tank 21 can be guided to flow towards the annular valve 301 and further enter the internal space of the filtering shell 302. The waste gas will contact the adsorption carbon plates 303. Through the adsorption effect of the carbon plates, the harmful components in the waste gas are effectively removed, thus realizing the preliminary filtration of the waste gas. Subsequently, through the further treatment of the filtering columns 304 and the filtering discs 305, the harmful substances contained in the discharged gas are reduced, ensuring that the gas emission meets the environmental protection standards, making not only the gas clean, but also effectively protecting the surrounding environment and avoiding the pollution of the environment by harmful substances.

[0028] Please refer to the attached Figure 1 、the attached Figure 4 and the attached Figure 6 , a sealing ring 30 is fixedly installed at the left end of the outer wall of the high-pressure steam injection valve 27. The outside of the sealing ring 30 is fixedly connected to the right side of the oxygen pressure leaching tank 21; a control switch 24 is fixedly connected to the left side of the frame 1. The control switch 24 is electrically connected to the pressure filter device 6, the evaporator 8, the variable-frequency blower 14, the solenoid valve 18 and the swing cylinder 203 respectively; a rubber pad 17 is fixedly connected to the right end of the outer wall of the conveying pipe 15, and a rubber ring 23 is fixedly connected to the bottom end of the outer wall of the condensate pipe 9; two connecting seats 25 are fixedly connected to both the left and right sides of the frame 1, and an installation groove 26 is formed in the top wall of the connecting seat 25.

[0029] In the present invention, through the sealing ring 30, the sealing effect between one end of the high-pressure steam injection valve 27 and the oxygen pressure leaching tank 21 is improved. Through the control switch 24 which is electrically connected to the pressure filter device 6, the evaporator 8, the variable-frequency blower 14, the solenoid valve 18 and the swing cylinder 203 respectively, the control switch 24 completes the opening and closing of the device. Through the connecting seat 25 and the installation groove 26, it is convenient to install and fix the device, thus improving the overall stability of the device.

[0030] The medical zinc smelting process includes the following steps: S1. The zinc oxide raw materials are sampled and tested, divided into high-chlorine secondary zinc oxide and low-chlorine secondary zinc oxide. Subsequently, the high-chlorine secondary zinc oxide is wet ball-milled and slurried by a ball mill, and caustic soda is added in proportion and stirred. After reacting for a period of time, it is subjected to alkali washing and dechlorination through the alkali washing tank 5. After alkali washing, it is filtered by the filter press equipment 6, and the residue enters the leaching process; S2. Sodium sulfide and thallium remover are added to the alkali washing solution for impurity removal and then filtered again. The filtrate is added to the crystallization tank 7, and concentrated crystallization is completed through the evaporator 8. At the same time, sodium chloride and potassium chloride are separated by using the different solubility changes of sodium chloride and potassium chloride with temperature. The condensed water generated by evaporation is recycled to the inside of the alkali washing tank 5 through the filter press equipment 6; S3. The dechlorinated secondary zinc oxide is added to the inside of the medium leaching tank 11. By starting the variable-frequency blower 14, high-pressure air flow is conveyed through the conveying pipe 15. Then, under the diversion of the diversion pipe 16, the air flow enters the inside of the medium leaching tank 11 respectively. Furthermore, the stirring blades 13 in the medium leaching tank 11 are driven to rotate synchronously with the rotating column 12, so as to react with the dechlorinated spent electrolyte solution in the medium leaching tank 11; S3. At the same time, the temperature is controlled through the heater 29. Subsequently, the neutral leaching slurry is separated again by the filter press equipment 6 to obtain the medium leaching solution. The neutral leaching slurry is separated by the filter press equipment 6 to obtain the medium leaching solution. The medium leaching residue is continuously leached with a solution to improve the leaching rate of zinc and extract valuable metal elements in the residue. After acid leaching, it is filtered. The filter residue is the acid leaching residue for further leaching. After the acid leaching residue is slurried, it is put into the sealed oxygen pressure leaching tank 21, and waste electrolyte solution is added. High-pressure steam is injected through the high-pressure steam injection valve 27 to achieve the purpose of heating. At the same time, the air flow conveyed through another path is output through the annular nozzle 20, so that the waste electrolyte solution after the acid leaching residue is slurried is heated by high-pressure steam; S4. Subsequently, the medium leaching solution contains a small amount of divalent iron. Oxygen or hydrogen peroxide is introduced to oxidize it to trivalent iron. Part of manganese dioxide and activated carbon are added to make the iron meet the goethite conditions to form goethite precipitation and adsorb arsenic and antimony. The activated carbon adsorbs trace organic substances in the solution. After filtration, the filtrate is sent to the next process; S5. The copper slag dechlorination uses copper and divalent copper ions to react with chloride ions in the solution to form insoluble precipitates. Then the slag is regenerated and returned for dechlorination. Zinc powder is added to displace the excessive copper element in the solution. The purification effect of the zinc solution is completed through iron and organic matter removal, copper salt dechlorination, copper salt regeneration, and pickling of the dechlorination slag.

[0031] Working principle: First, sample and test the secondary zinc oxide raw material, which is divided into high-chlorine secondary zinc oxide and low-chlorine secondary zinc oxide. Subsequently, the high-chlorine secondary zinc oxide is slurried by wet ball milling in a ball mill, and caustic soda is added in proportion and stirred. After reacting for a period of time, it is dechlorinated by alkali washing in the alkali washing tank 5. After alkali washing, it is pressure-filtered by the pressure filtration equipment 6. The slag enters the leaching process. Sodium sulfide and thallium removal agent are added to the alkali washing solution for impurity removal and then pressure-filtered again. The filtrate is added into the crystallization tank 7, and concentrated crystallization is completed through the evaporator 8. At the same time, sodium chloride and potassium chloride are separated by using the different solubility changes of sodium chloride and potassium chloride with temperature. The condensed water generated by evaporation is reused inside the alkali washing tank 5 through the pressure filtration equipment 6. The dechlorinated secondary zinc oxide is added into the medium leaching tank 11. By starting the variable-frequency fan 14, high-pressure air is conveyed through the conveying pipe 15, and then under the diversion of the diversion pipe 16, the air flows into the inside of the medium leaching tank 11 respectively. Then, the stirring blades 13 in the medium leaching tank 11 are driven to rotate synchronously with the rotating column 12, so as to react with the dechlorinated spent electrolyte solution in the medium leaching tank 11. At the same time, the temperature is controlled through the heater 29. Subsequently, the neutral leaching slurry is separated by the pressure filtration equipment 6 again to obtain the medium leaching solution. The neutral leaching slurry is separated by the pressure filtration equipment 6 to obtain the medium leaching solution. The medium leaching residue is continuously leached with a solution to improve the leaching rate of zinc and extract valuable metal elements in the residue. After acid leaching, it is pressure-filtered, and the filter residue is further leached as the acid leaching residue. After the acid leaching residue is slurried, it is put into the sealed oxygen pressure leaching tank 21, and waste electrolyte solution is added. High-pressure steam is injected through the high-pressure steam injection valve 27 to achieve the purpose of heating. At the same time, the air flow conveyed by another path is output through the annular nozzle 20, so that the waste electrolyte solution after the acid leaching residue is slurried is heated by high-pressure steam, further improving the reaction rate and avoiding the situation that affects the purification effect. Subsequently, there is a small amount of divalent iron in the medium leaching solution. Oxygen or hydrogen peroxide is introduced to oxidize it to trivalent iron. Part of manganese dioxide and activated carbon are added to make the iron meet the goethite conditions to form goethite precipitation and adsorb arsenic and antimony. The activated carbon adsorbs trace organic substances in the solution. After pressure filtration, the filtrate is sent to the next process. The copper slag dechlorination uses copper and divalent copper ions to react with chloride ions in the solution to form insoluble precipitates, and then the slag is regenerated and returned for dechlorination. Zinc powder is added to displace the excessive copper element in the solution. The purification effect of the zinc solution is completed through iron and organic matter removal, copper salt dechlorination, copper salt regeneration, and acid washing of the dechlorination slag; Then, by starting the swing cylinder 203, the two rotating shells 204 drive the connecting rod 205 to complete swinging, so that under the connection of the connecting rod 205, the clamping plates 206 rotationally connected by torsion springs rotate synchronously to one side of the oxygen pressure leaching tank 21. After fitting and clamping, the purpose of protecting both sides of the oxygen pressure leaching tank 21 is achieved. At the same time, a plurality of engaging teeth 207 are engaged with a plurality of engaging grooves 208, thereby improving the engaging connection effect between the clamping plate 206 and the oxygen pressure leaching tank 21, ensuring its stability, and increasing the service life of the oxygen pressure leaching tank 21; Moreover, by opening the annular valve 301, the waste gas generated by the oxygen pressure leaching tank 21 enters the interior of the filter housing 302 through the annular valve 301, enabling the waste gas to be adsorbed by the adsorption carbon plate 303 to achieve the purpose of preliminary waste gas filtration. Subsequently, under the filtration of the filter column 304 and the filter disc 305, the harmful substances contained in the discharged gas are reduced to meet the standard of the discharged gas, thereby achieving the effect of protecting the surrounding environment.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zinc solution purification device and a metallic zinc smelting process, comprising a frame (1) and an oxygen pressure leaching tank (21), characterized in that: On the left side of the top wall of the frame (1), a first treatment tank (4) is fixedly connected. At the rear side inside the first treatment tank (4), an alkali washing tank (5) is provided. In the middle of the top wall of the frame (1), a pressure filtration device (6) is fixedly connected. At the front side inside the first treatment tank (4), a crystallization tank (7) is provided. On the inner bottom wall of the crystallization tank (7), an evaporator (8) is fixedly connected. On the right side of the top wall of the frame (1), a second treatment tank (10) is fixedly connected. On the left side inside the second treatment tank (10), a medium immersion tank (11) is provided. On the left side inner wall of the second treatment tank (10), a rotating column (12) is rotatably connected. On the outer wall of the rotating column (12), a plurality of stirring blades (13) are fixedly connected. On the inner top wall of the frame (1), a variable frequency blower (14) is fixedly connected. The right end of the variable frequency blower (14) is communicated with a conveying pipe (15). In the middle of the conveying pipe (15), a shunt pipe (16) is communicated. The top end of the shunt pipe (16) is communicated with the medium immersion tank (11). The right end of the conveying pipe (15) is communicated with an annular spray head (20). The bottom wall of the annular spray head (20) is fixedly connected to the inner bottom wall of the oxygen pressure leaching tank (21). On the inner wall of the oxygen pressure leaching tank (21), two filter plates (22) are fixedly connected. On the right side of the second treatment tank (10), an acid leaching assembly is provided. On the front and rear sides of the frame (1), fixing mechanisms (2) are provided. On the top of the oxygen pressure leaching tank (21), a filtering mechanism (3) is provided.

2. A zinc solution purification device and a metallic zinc smelting process according to claim 1, characterized in that: The fixing mechanism (2) includes two connecting plates (201). One sides of the two connecting plates (201) are respectively fixedly connected to the front and rear sides of the frame (1). On the top wall of the connecting plate (201), a vertical plate (202) is fixedly connected. On the right side of the vertical plate (202), a swing cylinder (203) is fixedly connected. The left end of the swing cylinder (203) is fixedly connected to a rotating shell (204). On the top of the rotating shell (204), a connecting rod (205) is fixedly connected. The top end of the connecting rod (205) is rotatably connected to a clamping plate (206) through a torsion spring. On the left and right sides of the clamping plate (206), two engaging teeth (207) are respectively fixedly connected. On the front and rear sides of the oxygen pressure leaching tank (21), a plurality of engaging grooves (208) are provided. One sides of the plurality of engaging teeth (207) are respectively engaged with the corresponding engaging grooves (208).

3. A zinc solution purification device and a metallic zinc smelting process according to claim 1, characterized in that: The filtering mechanism (3) includes an annular valve (301). The outer wall of the annular valve (301) is fixedly installed on the inner wall top of the oxygen pressure leaching tank (21). On the top wall of the annular valve (301), a filtering shell (302) is fixedly connected. On the bottom of the front and rear sides of the filtering shell (302), adsorption carbon plates (303) are slidably connected. In the middle of the front and rear sides of the filtering shell (302), a plurality of filtering columns (304) are communicated. On one side of the filtering column (304), a filtering disc (305) is fixedly connected.

4. A zinc solution purification device and a metallic zinc smelting process according to claim 1, characterized in that: The acid leaching assembly includes an injection pipe (19), the left end of the injection pipe (19) is connected to the right side of the second treatment tank (10), an acid leaching tank (28) is provided on the right side inside the second treatment tank (10), the right end of the injection pipe (19) is connected to the left side of the oxygen pressure leaching tank (21), a heater (29) is fixedly connected to the left side inner wall of the acid leaching tank (28), the bottom wall of the annular spray head (20) is fixedly connected to the inner bottom wall of the oxygen pressure leaching tank (21), solenoid valves (18) are connected to the front and rear sides of the first treatment tank (4) and the front side of the second treatment tank (10), a high-pressure steam injection valve (27) is connected to the right side of the oxygen pressure leaching tank (21), a condensing pipe (9) is connected to the top wall of the pressure filtration device (6), and the left end of the condensing pipe (9) is connected to the alkali washing tank (5).

5. A zinc solution purification device and a metal zinc smelting process according to claim 2, characterized in that: The fixing mechanism (2) further includes two rubber plates (209), and one sides of the two rubber plates (209) are respectively fixedly connected to one side of the clamping plate (206).

6. A zinc solution purification device and a metal zinc smelting process according to claim 3, characterized in that: The filtering mechanism (3) further includes a plurality of rubber rings (306), and the plurality of rubber rings (306) are respectively fixedly connected to the other side of the filtering column (304).

7. A zinc solution purification device and a zinc metal smelting process according to claim 4, characterized in that: A sealing ring (30) is fixedly installed on the left end outer wall of the high-pressure steam injection valve (27), and the outer side of the sealing ring (30) is fixedly connected to the right side of the oxygen pressure leaching tank (21).

8. A zinc solution purification device and a metal zinc smelting process according to claim 2, characterized in that: A control switch (24) is fixedly connected to the left side of the frame (1), and the control switch (24) is electrically connected to the pressure filtration device (6), the evaporator (8), the variable frequency blower (14), the solenoid valve (18), and the swing cylinder (203) respectively.

9. A zinc solution purification device and a metal zinc smelting process according to claim 4, characterized in that: A rubber pad (17) is fixedly connected to the right end outer wall of the conveying pipe (15), and a rubber ring (23) is fixedly connected to the bottom end outer wall of the condensing pipe (9).

10. A zinc solution purification device and a metallic zinc smelting process according to claim 4, characterized in that: Two connecting seats (25) are fixedly connected to both the left and right sides of the frame (1), and an installation groove (26) is provided on the top wall of the connecting seat (25).

11. Medical zinc smelting process, according to a zinc solution purification device and a metal zinc smelting process as claimed in claims 1-9, characterized in that, including the following steps: S1. The zinc oxide raw material is sampled and tested, divided into high-chlorine secondary zinc oxide and low-chlorine secondary zinc oxide. Then, after the high-chlorine secondary zinc oxide is wet ball-milled and slurried by a ball mill, caustic soda is added in proportion and stirred. After reacting for a period of time, it is subjected to alkali washing and dechlorination through the alkali washing tank 5. After alkali washing, it is filtered by the pressure filtration device 6, and the residue enters the leaching process; S2. Sodium sulfide and thallium removal agent are added to the alkali washing solution for impurity removal and then filtered again. The filtrate is added into the crystallization tank (7), and concentrated crystallization is completed through the evaporator (8). At the same time, sodium chloride and potassium chloride are separated by using the different solubility of sodium chloride and potassium chloride with temperature change. The condensed water generated by evaporation is recycled to the inside of the alkali washing tank (5) through the pressure filtration device (6); S3. The dechlorinated secondary zinc oxide is added into the internal part of the medium leaching tank (11). By starting the frequency conversion blower (14), high-pressure air flow is conveyed through the conveying pipe (15). Then, under the diversion of the diversion pipe (16), the air flow enters the internal part of the medium leaching tank (11) respectively. Furthermore, the stirring blades (13) in the medium leaching tank (11) are driven to rotate synchronously with the rotating column (12), so as to react with the dechlorinated waste electrolyte solution in the medium leaching tank (11). S3. At the same time, the temperature is controlled by the heater (29). Subsequently, the neutral leaching slurry is separated by the pressure filtration equipment (6) again to obtain the medium leaching solution. The neutral leaching slurry is separated by the pressure filtration equipment (6) to obtain the medium leaching solution. The medium leaching residue is leached continuously with the solution to improve the leaching rate of zinc and extract valuable metal elements in the residue. After acid leaching and pressure filtration, the filter residue is the acid leaching residue for further leaching. After the acid leaching residue is slurried, it is put into the sealed oxygen pressure leaching tank (21), and the waste electrolyte solution is added. High-pressure steam is injected through the high-pressure steam injection valve (27) to achieve the purpose of heating. At the same time, the air flow conveyed in another path is output through the annular spray head (20), so that the waste electrolyte solution after the acid leaching residue is slurried is heated by high-pressure steam. S4. Subsequently, there is a small amount of divalent iron in the medium leaching solution. Oxygen or hydrogen peroxide is introduced to oxidize it into trivalent iron. Part of manganese dioxide and activated carbon are added to make the iron meet the goethite condition to form goethite precipitation and adsorb arsenic and antimony. The activated carbon adsorbs trace organic matters in the solution. After pressure filtration, the filtrate is sent to the next process. S5. The dechlorination of copper slag utilizes the reaction of copper and divalent copper ions with chloride ions in the solution to form insoluble precipitates. Then the slag is regenerated and returned for dechlorination. Zinc powder is added to displace the excessive copper element in the solution. The purification effect of the zinc solution is completed through iron and organic matter removal, copper salt dechlorination, copper salt regeneration and pickling of dechlorination slag.

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