Metal zinc recovery device and application thereof

Abstract

The invention provides a metal zinc recovery device and application thereof, and relates to the field of metal production or refining. The main furnace body is coupled with the flue gas treatment assembly, all the areas of the main furnace body are in through connection, and in the metal zinc recovery process, spherical materials in the device can be rapidly, fully and synchronously subjected to a zinc reduction reaction and a sulfur element curing reaction through reducing substances sprayed by the reducing gas nozzles, so that efficient gas-slag separation is completed. The liquid metal zinc is directly produced from complex-component zinc-containing mineral products such as oxygen-sulfur mixed mineral through a one-step method, the sulfur element is synchronously solidified in a slag phase, and low-concentration SO2 pollution is eliminated. And due to the short-process characteristic of the device, the process is remarkably simplified, the energy consumption and the operation cost are reduced, and an innovative solution is provided for clean smelting of complex low-grade zinc ore. When the device is applied to recovery of metal zinc, environmental pollution can be reduced; and the raw materials are wide in selection range, convenient to operate, safe, energy-saving and environment-friendly, and have a wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metal production or refining, and particularly relates to a metal zinc recovery device and application thereof. BACKGROUND

[0002] Zinc, as an important basic non-ferrous metal, has excellent physical and chemical properties, and its production mainly includes two processes of pyrometallurgy and hydrometallurgy. The traditional hydrometallurgy of zinc relies on the process flow of zinc sulfide concentrate roasting, multi-stage leaching and electrolytic purification, which not only has a long process flow and high sulfuric acid consumption, but also has poor adaptability to complex low-grade ores (especially multi-gangue, oxygen-sulfur symbiotic ores), and the generated zinc-containing leaching slag is a hazardous waste due to high toxicity, and its treatment must strictly implement relevant standards, resulting in high disposal cost and environmental burden.

[0003] However, the mainstream pyrometallurgical zinc smelting technology (vertical tank method, electric furnace, volatilization kiln, ISP method, etc.) avoids the problem of secondary treatment of waste slag in the hydrometallurgy, but it is still not the mainstream process of zinc smelting: the operation process needs to be completed in stages to remove sulfur and reduce, and the vertical tank has high requirements for the composition of the raw material and a complex preparation process; the electric furnace needs to control the atmosphere and temperature in the furnace to prevent the massive reduction of iron. Except for the ISP process, most pyrometallurgical equipment (such as electric furnace and vertical tank) directly produces ZnO dust, which still needs to rely on the hydrometallurgical process to obtain crude zinc, which additionally increases energy consumption and equipment investment; for complex oxygen-sulfur mixed ores (S2~11%, Zn 5~40%), the traditional pyrometallurgy is difficult to simultaneously achieve efficient sulfur fixation and zinc metal reduction, resulting in low concentration of SO2 (0.5~2%) in the flue gas, which is difficult to recover economically and easy to cause sulfur pollution; and the hydrometallurgical process flow is strict in the requirement for the zinc grade of the raw material, and cannot match the demand for efficient utilization of complex ore resources. SUMMARY

[0004] The main purpose of the present application is to provide a metal zinc recovery device and application thereof, which aims to solve the problems of high efficient simultaneous sulfur fixation and metal zinc reduction, complicated process and the like when recovering metal zinc from zinc-containing ores by using the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a metal zinc recovery device, which comprises a main furnace body and a flue gas treatment assembly.

[0006] The main furnace body comprises a feeding zone, a heating zone, a high-temperature sulfur fixation and reduction zone and a discharging zone arranged in sequence according to the movement direction of the spherical material; an ascending flue is arranged at the upper part of the main furnace body, reduction gas nozzles are arranged circumferentially at the middle part of the main furnace body, the reduction gas nozzles are communicated with the high-temperature sulfur fixation and reduction zone, a group of supporting rollers and a transmission device capable of driving the spherical material to rotate are arranged at the bottom of the feeding zone, the heating zone, the high-temperature sulfur fixation and reduction zone and the discharging zone; a swing distributor is arranged in the feeding zone; and a cooling assembly is arranged in the discharging zone.

[0007] The flue gas treatment assembly comprises a zinc vapor condensing device and a dust removal device connected through.

[0008] Further, one side of the dust removal device is provided with a coal gas outlet channel, and the dust removal device is communicated with the zinc vapor condensing device through the coal gas outlet channel.

[0009] The top of the other side of the dust removal device is provided with a coal gas recycling pipeline, and two ends of the coal gas recycling pipeline are communicated with the dust removal device and the reducing gas nozzle respectively.

[0010] Further, the number of the reducing gas nozzles is greater than or equal to 2, and the reducing gas nozzles are uniformly distributed along the middle part of the main furnace body in the circumferential direction.

[0011] Further, the cross-sectional area of the reducing gas nozzle is 50-150mm 2 .

[0012] Further, the cooling assembly is a water-cooled jacket type structure, and the inner wall of the cooling assembly has a high-temperature-resistant ceramic coating.

[0013] Further, the length of the cooling assembly is 2-10m.

[0014] Further, the discharging area is also provided with a spiral discharging device, and the diameter of the spiral blade of the spiral discharging device is 0.5-2.0m.

[0015] The application also provides an application of the metal zinc recovery device in recovering metal zinc.

[0016] The ball material is obtained by drying the ball material, and the water content of the ball material is less than 5%.

[0017] The ball material is put into the metal zinc recovery device to recover metal zinc.

[0018] The residence time of the ball material in the metal zinc recovery device is 20-40 min, the material layer thickness of the ball material is 50-200 mm, the working temperature of the heating zone of the metal zinc recovery device is 500-900 DEG C, the working temperature of the high-temperature sulfur-fixing reduction zone of the metal zinc recovery device is 900-1400 DEG C, and the reducing gas is sprayed to the ball material through the reducing gas nozzle of the metal zinc recovery device when the metal zinc recovery device works, the temperature of the reducing gas is 400-800 DEG C, the total flow of the reducing gas spraying is 20-150 m 3 / h.

[0019] The stability of the residue after the cooling treatment by the cooling assembly of the metal zinc recovery device is <=200 DEG C.

[0020] The temperature of the zinc rain of the zinc vapor condensing device of the metal zinc recovery device is 590-610 DEG C, and the spraying flow of the zinc rain is 0.6-1.2 m 3 / min.

[0021] Further, the rotating speed of the ball material in the main furnace body of the metal zinc recovery device is 1.5-5 r / h.

[0022] The jacket cooling water flow of the cooling assembly of the spiral discharging device of the metal zinc recovery device is 1-10 m 3 / h.

[0023] The working spiral rotating speed of the spiral discharging device of the metal zinc recovery device is 5-30 r / min.

[0024] Further, the molar ratio of CaO to ZnS in the ball is 1-1.5.

[0025] The zinc-containing mineral includes one or more of complex oxygen-sulfur mixed zinc ore, lead-zinc sulfide concentrate, lead-zinc sulfide ore calcine, lead-zinc oxide ore and urban mineral.

[0026] The present application has the following beneficial effects:

[0027] The metal zinc recovery device provided by the application is coupled with a main furnace body and a flue gas treatment assembly, and the feeding area, the heating area, the high-temperature sulfur-fixing reduction area and the discharging area of the main furnace body are connected in series, and the reducing substance sprayed by the reducing gas nozzle in the metal zinc recovery process fills the high-temperature sulfur-fixing reduction area, and the "through structure + reducing gas nozzle" helps the rapid, sufficient and synchronous zinc reduction reaction and sulfur element solidification reaction of the spherical material entering the metal zinc recovery device, and the efficient separation of the gas and slag is completed. The obtained zinc vapor and the remaining reducing gas are further separated by the flue gas treatment assembly, and the liquid metal zinc product can be recovered, the liquid metal zinc is directly produced by one-step method from the oxygen-sulfur mixed ore and other complex component zinc-containing ores, and the sulfur element is simultaneously solidified in the slag phase, and the low-concentration SO2 pollution is eliminated. The short process characteristics of the metal zinc recovery device also significantly simplify the process, reduce the energy consumption and operation cost, and provide an innovative solution for the clean smelting of complex low-grade zinc ore.

[0028] The metal zinc recovery device is applied to the recovery of metal zinc, and the reducing gas nozzle of the metal zinc recovery device is used to spray multi-element hot reducing gas into the system, the reducing gas is used to heat the main furnace body, the resource utilization rate is improved, the emission of SO2 and other waste gas is reduced, the environmental pollution is reduced, the high-purity metal zinc is efficiently recovered, and efficient sulfur fixation and metal zinc reduction are simultaneously realized. The selection range of raw materials is wide, the operation is convenient and safe, energy saving and environmental protection are achieved, and the metal zinc recovery device has a wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the drawings shown.

[0030] Figure 1 The structure schematic view of the metal zinc recovery device of an optional embodiment of the application is shown in the figure.

[0031] Figure 2 The structure schematic side view of the metal zinc recovery device of an optional embodiment of the application is shown in the figure.

[0032] The implementation, functional characteristics and advantages of the application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0034] It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are used to describe specific specific embodiments, rather than to limit the protection scope of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used in the present application are used in the same meaning as the present technical field of the skilled person and the description of the present application, and any method, equipment and material of the prior art similar or equivalent to the method, equipment and material described in the embodiments of the present application can be used to realize the present application. When the embodiments give a numerical range, it should be understood that, unless otherwise stated by the present application, each numerical range and any numerical value between the two endpoints can be selected. The test method in the following examples is not specified, which is usually carried out under conventional conditions, or under the conditions recommended by the manufacturer. The materials or reagents required in the following examples, unless otherwise specified, are commercially available.

[0036] In order to solve the problems of high efficient synchronous sulfur fixation and metal zinc reduction, complicated process and the like in the recovery of metal zinc from zinc-containing mineral products by using the prior art, the present application provides a metal zinc recovery device, which comprises a main furnace body 2 and a flue gas treatment assembly.

[0037] The main furnace body 2 comprises a feeding area 3, a heating area 4, a high-temperature sulfur fixation reduction area 5 and a discharging area 6 arranged in sequence according to the direction of spherical material; an ascending flue 11 is arranged at the upper part of the main furnace body 2, a reduction gas nozzle 10 is arranged circumferentially at the middle part of the main furnace body 2 and is communicated with the high-temperature sulfur fixation reduction area 5, a roller group 8 capable of driving the spherical material to rotate and a transmission device are arranged at the bottom of the feeding area 3, the heating area 4, the high-temperature sulfur fixation reduction area 5 and the discharging area 6; the feeding area 3 is provided with a swing distributor 1; the discharging area 6 is provided with a cooling assembly 9.

[0038] Specifically, referring to Figure 1 and Figure 2The swing feeder 1 of the feeding area 3 comprises a swing driving mechanism, a rotary feeding shaft and a guide plate. The guide plate is a double-layer high-temperature-resistant alloy material and is hinged to the two sides of the rotary feeding shaft at an inclination angle of 15-45°. The rotary feeding shaft is driven by a variable frequency motor to ensure that the spherical materials are uniformly spread into the hearth of the main furnace body 2. Preferably, the inside of the hearth of the feeding area 3 is provided with a high-temperature-resistant lining. After the spherical materials are continuously and uniformly fed into the main furnace body 2 by the swing feeder 1, the feeding process is synchronized with the conveying speed (1.5-5 r / h) of the spherical materials, so that the thickness of the material layer of the spherical materials is controlled at 50-200 mm, to ensure the uniformity of the subsequent heating and reduction reaction and avoid local overburning or insufficient reduction.

[0039] The reducing gas nozzle 10 is in communication with the gas pipeline 16 outside the main furnace body 2. The reducing gas is injected into the inside of the main furnace body 2 through the gas pipeline 16. The reducing gas includes one or more of carbon powder, H2, CO, CH4 and SO2.

[0040] Preferably, the furnace wall of the high-temperature sulfur-fixing reduction area 5 is a double-layer cooling structure composed of a steel plate spray water jacket or a copper water jacket, and an annular water distribution channel is arranged in the water jacket to resist the corrosion of high-temperature molten slag and maintain the reaction temperature in the furnace.

[0041] The flue gas treatment assembly comprises a zinc vapor condensing device 12 and a dust removal device 15 connected in series. The zinc vapor condensing device 12 is in communication with the main furnace body 2 through the rising flue 11. Preferably, the material of the rising flue 11 is 316L stainless steel, and the wall thickness of the rising flue 11 is 10-20 mm. The zinc vapor entering the zinc vapor condensing device 12 through the rising flue 11 is subjected to zinc rain condensing treatment in the zinc vapor condensing device 12 to obtain liquid metal zinc, which can be discharged from the liquid outlet 13 of the zinc vapor condensing device 12 into a rectification device or an ingot casting device to obtain more refined metal zinc products. Preferably, the outlet of the heat exchange medium of the zinc vapor condensing device 12 is connected to a waste heat power generation device or a domestic water storage device to improve the utilization rate of heat sources.

[0042] The zinc recovery device provided by this invention couples the main furnace body 2 with a flue gas treatment component. The feeding zone 3, heating zone 4, high-temperature sulfur fixation reduction zone 5, and unloading zone 6 of the main furnace body 2 are interconnected. During the zinc recovery process, reducing substances injected through the reducing gas nozzle 10 fill the high-temperature sulfur fixation reduction zone 5. The "through-type structure + reducing gas nozzle 10" helps the spherical material entering the zinc recovery device to undergo rapid and sufficient simultaneous zinc reduction and sulfur solidification reactions, achieving efficient gas-slag separation. The obtained zinc vapor and residual reducing gas are further separated by the flue gas treatment component to recover liquid zinc products. This enables the one-step direct production of liquid zinc from complex zinc-containing ores such as oxygen-sulfur mixed ores, while simultaneously solidifying sulfur in the slag phase, eliminating low-concentration SO2 pollution. The short-process characteristics of this zinc recovery device also significantly simplify the process, reduce energy consumption and operating costs, and provide an innovative solution for the clean smelting of complex low-grade zinc ores.

[0043] Furthermore, a gas outlet channel 14 is provided on one side of the dust removal device 15, and the dust removal device 15 is connected to the zinc vapor condensation device 12 through the gas outlet channel 14.

[0044] A gas recycling pipeline is installed on the top of the other side of the dust removal device 15. Both ends of the gas recycling pipeline are connected to the dust removal device 15 and the reducing gas nozzle 10, respectively. Specifically, the reducing gas (CO) generated during the zinc recovery process and treated by the dust removal device 15 can be directly injected into the main furnace body 2 through the gas recycling pipeline to continue participating in the zinc reduction reaction and the sulfur element solidification reaction. This serves to supplement the heat of the main furnace body 2 and improves resource utilization.

[0045] Furthermore, the number of reducing gas nozzles 10 is ≥2; and the reducing gas nozzles 10 are evenly distributed circumferentially along the middle of the main furnace body 2. Preferably, the number of reducing gas nozzles 10 is 8 to 24, which helps to ensure that the furnace system is always in a reducing atmosphere. The reducing gas nozzles 10 are detachable high-temperature alloy structures. The high-temperature alloy includes 316 stainless steel or nickel-based alloys.

[0046] Furthermore, the cross-sectional area of ​​the reducing gas nozzle 10 is 50–150 mm. 2 Specifically, 50-150mm 2 The reducing gas nozzle 10 with a cross-sectional area can ensure uniform gas pressure and airflow.

[0047] Furthermore, the cooling component 9 is a water-cooled jacketed structure; the inner wall of the cooling component 9 has a high-temperature resistant ceramic coating.

[0048] Furthermore, the length of the cooling component 9 is 2 to 10 meters. Specifically, when the length of the cooling component 9 is 2 to 10 meters, it can ensure that it can accommodate at least 1 hour of residue generated during continuous production.

[0049] Further, the discharging area 6 is also provided with a spiral discharging device 7; the diameter of the spiral blade of the spiral discharging device 7 is 0.5-2.0 m. Specifically, the spiral discharging device 7 comprises coaxially arranged spiral blades and a variable frequency speed regulation driving mechanism. When discharging is needed, the spiral discharging device 7 drives the spiral blades to rotate by the variable frequency speed regulation driving mechanism, and the high-temperature reduced slag (the temperature of the high-temperature reduced slag is 900-1400℃) conveyed to the discharging area 6 is axially scraped and transported to the cooling assembly 9 for cooling treatment.

[0050] The application further provides application of the metal zinc recovery device in recovery of metal zinc.

[0051] The ball-shaped material is obtained by drying the ball-shaped material; the water content of the ball-shaped material is <5%. Specifically, high water content (≥5%) can cause CaO to generate Ca(OH)2 in the heating process, so that the mechanical properties of the ball-shaped material are reduced, and the ball-shaped material is expanded or pulverized.

[0052] The ball-shaped material is put into the metal zinc recovery device to obtain metal zinc.

[0053] The ball-shaped material is put into the metal zinc recovery device to obtain metal zinc. 3 The residence time of the ball-shaped material in the metal zinc recovery device is 20-40 min, the material layer thickness of the ball-shaped material is 50-200 mm; the working temperature of the heating area 4 of the metal zinc recovery device is 500-900℃; the working temperature of the high-temperature sulfur-fixing reduction area 5 of the metal zinc recovery device is 900-1400℃; when the metal zinc recovery device works, the reducing gas is sprayed to the ball-shaped material through the reducing gas nozzle 10 of the metal zinc recovery device, the temperature of the reducing gas is 400-800℃, and the total flow of the reducing gas is 20-150 m

[0054] Specifically, referring to Figure 1 and Figure 2 , the ball-shaped material enters the feeding area 3 of the metal zinc recovery device through the swing distributor 1 and falls on the transmission device, and the ball-shaped material is driven to rotate from the feeding area 3 to the discharging area 6 through the roller group 8, so that the ball-shaped material moves in the opposite direction of the airflow direction, and the contact between the ball-shaped material and the reducing gas is strengthened. When the ball-shaped material rotates to the heating area 4 and is heated to 500-900℃, a pre-reduction reaction occurs, and ZnO and CaO are obtained. The reaction is as follows:

[0055] ZnCO3=CO2(g)+ZnO

[0056] CaCO3 = CaO + CO2(g).

[0057] Continuing rotation to the high-temperature sulfur-fixing reduction zone 5, the zinc reduction reaction and sulfur-fixing reaction are completed synchronously with the reduction material injected through the reduction gas nozzle 10 as follows:

[0058] ZnS(s) + CaO(s) + C(s) = CaS(s) + CO(g) + Zn(g)

[0059] ZnS + CaO + CO(g) = CaS + CO2(g) + Zn(g)

[0060] ZnS + C + CaSiO3 = Zn(g) + SiO2 + CaS + CO(g)

[0061] ZnS + CO(g) + CaSiO3 = Zn(g) + SiO2 + CaS + CO2(g)

[0062] Zn2SiO4 + 2C = 2Zn(g) + 2CO(g) + SiO2

[0063] ZnO + C = Zn(g) + CO(g)

[0064] ZnO + CO(g) = Zn(g) + CO2(g);

[0065] The high-temperature reduction slag and zinc-containing mixed gas are obtained. The high-temperature reduction slag is continuously transmitted to the discharging zone 6; the zinc-containing mixed gas is transported to the zinc vapor condensing device 12 from the ascending flue 11, and after the zinc rain condensing treatment of the zinc vapor condensing device 12, liquid metal zinc is obtained and discharged from the liquid outlet 13 for subsequent other treatment; other residual gas is discharged into the dust removal device 15 through the coal gas outlet channel 14, and further reduction gas dust removal is performed to obtain purified coal gas. Preferably, the coal gas is injected into the main furnace body 2 from the reduction gas nozzle 10 through the coal gas recycling pipeline to participate in the zinc reduction reaction and sulfur-fixing reaction again.

[0066] The temperature of the residual slag after the cooling treatment of the metal zinc recovery device is ≤200°C. Specifically, the high-temperature reduction slag obtained after the zinc reduction reaction and sulfur-fixing reaction is axially scraped by the spiral discharging device 7 to the cooling assembly 9 for cooling treatment, and the high-temperature furnace slag is rapidly water-cooled to reduce the temperature from 900-1400°C to 200°C or below to obtain the residual slag.

[0067] The temperature of the zinc rain of the zinc vapor condensing device 12 of the metal zinc recovery device is 590-610°C; the spraying flow rate of the zinc rain is 0.6-1.2 m 3 / min. Specifically, the oxygen inhibition effect is closely related to the temperature of zinc rain and the spray flow of zinc rain, and under the condition, the oxygen inhibition rate of zinc vapor reaches the maximum, which can be up to 98%.

[0068] Further, the rotating speed of the ball material in the main furnace body 2 of the metal zinc recovery device is 1.5-5 r / h.

[0069] The jacket cooling water flow of the cooling assembly 9 of the spiral discharging device 7 of the metal zinc recovery device is 1-10 m 3 / h when the cooling assembly 9 works. Specifically, the jacket cooling water flow can effectively control the cooling water temperature and the cooling effect.

[0070] The working spiral rotating speed of the spiral discharging device 7 of the metal zinc recovery device is 5-30 r / min. Specifically, the working spiral rotating speed of 5-30 r / min can ensure that the discharging rate is coordinated with the production process.

[0071] Further, the molar ratio of CaO to ZnS in the ball is 1-1.5. Specifically, the sufficient amount of sulfur-fixing agent can ensure the sulfur-fixing reduction effect and the reaction rate.

[0072] The zinc-containing mineral includes one or more of complex oxygen-sulfur mixed zinc ore, lead-zinc sulfide concentrate, lead-zinc sulfide calcine, lead-zinc oxide ore, and urban mineral. Specifically, the main valuable metal phase in the above-mentioned minerals is ZnS, ZnCO3, ZnO, etc. In view of the problems that ZnS cannot be directly reduced and Zn vapor cannot be directly recovered and utilized in the conventional pyrometallurgical equipment, the device utilizes the multi-temperature zone and multi-atmosphere controllable advantages to cooperate with the sulfur-fixing agent (CaO, CaCO3) to realize one-step extraction and direct recovery of zinc in complex minerals.

[0073] When the metal zinc recovery device is applied to recover metal zinc, the multi-element hot reducing gas can be sprayed into the system by the reducing gas nozzle 10 of the metal zinc recovery device, the main furnace body 2 is heated by the reducing gas, the resource utilization rate is improved, the emission of waste gas such as SO2 is reduced, which is helpful to reduce environmental pollution, realize efficient recovery of high-purity metal zinc, and simultaneously realize efficient sulfur fixation and metal zinc reduction. The selection range of raw materials is wide, the operation is convenient and safe, energy saving and environmental protection, and has a wide application prospect.

[0074] In order to further understand the present application, examples are given as follows:

[0075] Example 1

[0076] (1) Preparation of ball material

[0077] 50kg of oxygen-sulfur mixed zinc ore is mixed with lime, high-volatile coal (carbonaceous reducing agent) and bentonite at a mass ratio of 100:20:15:3, wherein the molar ratio of CaO to ZnS in the mixture is 1.5:1. The mixed material is prepared into pellets (pellet size 15mm); the pellets are sent into an electric hot air drying box (60℃, 40min) for drying treatment, and spherical material (moisture content 4%) is obtained.

[0078] (2) The spherical material is put into a metal zinc recovery device (refer to the drawings shown in Figure 1 and Figure 2 ) for metal zinc recovery treatment, and the specific process is as follows:

[0079] The spherical material is uniformly laid on the front end of the preheating zone of the transmission device of the main furnace body 2 by a swing distributor 1, the material layer has a thickness of 150mm, and is transmitted to the heating zone 4 by the low-speed rotation (rotation speed 2r / h) of the roller group 8, preheated by the reduction gas carried by the reduction gas nozzle to carry heat (the temperature of the heating zone 4 is controlled at 900℃), and a preliminary reduction reaction occurs, and the combined water and volatile impurities on the surface of the spherical material are preliminarily removed.

[0080] Subsequently, the spherical material enters the high-temperature sulfur-fixing reduction zone 5 (1200℃ constant temperature control), and the CO and H2 mixed gas (total flow rate of 100m 3 / h, temperature of the reducing gas 600℃) is sprayed into the reduction gas nozzle 10, under the action of the CO-H2 reducing atmosphere, ZnO and ZnS are synchronously reduced to gaseous zinc (reaction time 40min), and the sulfur element combines with Fe and Ca in the high-temperature reduction slag phase to form stable FeS / CaS slag phase.

[0081] The zinc vapor is transported to the zinc vapor condensing device 12 by the spiral guide rising flue 11 (zinc rain temperature 590℃, spraying flow rate 0.6m 3 / min), and the reaction Zn(g)→Zn(l) occurs, and the condensed liquid metal zinc is continuously cast into zinc ingot products by a rectifying device or an ingot casting device.

[0082] The other residual gas is discharged into the dust removal device 15 through the coal gas outlet channel 14, and further reduction gas dust removal is performed to obtain purified coal gas. The coal gas is sprayed into the main furnace body 2 from the reduction gas nozzle 10 through the coal gas recycling pipeline to participate in the zinc reduction reaction and sulfur element solidification reaction again.

[0083] After the high-temperature sulfur-fixing reduction reaction, the high-temperature reduction slag is axially scraped and transported to the cooling assembly 9 by the spiral unloading device 7 with a diameter of 1.0m (spiral rotation speed 13r / min). The high-temperature reduction slag is cooled to 200℃ by the cooling assembly 9 (cooling water flow rate 8m 3 / h, the length of cooling assembly 9 is 5 m), to obtain residue. The main phases of the residue are CaS, CaSiO3, Ca2SiO4, SiO2.

[0084] The calculated reduction and volatilization rate of zinc is 90.3%, and the sulfur fixation rate is 88.5%.

[0085] Example 2

[0086] (1) Preparation of spherical material

[0087] 50 kg of oxygen-sulfur mixed zinc ore is mixed with lime, high-volatile coal (carbonaceous reducing agent) and bentonite at a mass ratio of 100:10:15:3. The molar ratio of CaO to ZnS in the mixed material is 1:1. The mixed material is prepared into pellets (pellet size 11 mm); the pellets are sent to an electric hot air drying box (60°C, 40 min) for drying treatment, and the spherical material (moisture content 3%) is obtained.

[0088] (2) The spherical material is put into a metal zinc recovery device (refer to Figure 1 and Figure 2 ) for metal zinc recovery treatment, and the specific process is as follows:

[0089] The spherical material is uniformly laid on the front end of the preheating zone of the transmission device of the main furnace body 2 by the swing material distributor 1, and the material layer thickness is 200 mm. The spherical material is transmitted to the heating zone 4 by the low-speed rotation (speed 5 r / h) of the roller group 8, preheated by the reduction gas carried by the reduction gas nozzle (the temperature of the heating zone 4 is controlled at 500°C), and the preliminary reduction reaction occurs, and the combined water and volatile impurities on the surface of the spherical material are preliminarily removed.

[0090] Subsequently, the spherical material enters the high-temperature sulfur-fixing reduction zone 5 (900°C constant temperature control), and CH4 is sprayed through the reduction gas nozzle 10 (the total flow rate of CH4 is 150 m 3 / h, the temperature of the reducing gas is 400°C). Under the action of CH4 reducing atmosphere, ZnO and ZnS are simultaneously reduced to gaseous zinc (reaction time 20 min), and the sulfur element combines with Fe and Ca in the high-temperature reduction slag phase to form stable FeS / CaS slag phase.

[0091] The zinc vapor is transported to the zinc vapor condensing device 12 by the spiral guide rising flue 11 (zinc rain temperature is 610°C, spraying flow rate is 1.2 m 3 / min), and the Zn(g)→Zn(l) reaction occurs, and the condensed liquid metal zinc is continuously cast into zinc ingot products by the rectifying device or the ingot casting device.

[0092] The other residual gas is discharged into the dust removal device 15 through the gas outlet channel 14, and further dust removal is performed to obtain purified coal gas. The coal gas is reused by a coal gas reuse pipeline and is sprayed into the main furnace body 2 from the reducing gas nozzle 10 to participate in the zinc reduction reaction and the sulfur element solidification reaction again.

[0093] After the high-temperature sulfur-fixing reduction reaction, the high-temperature reduction slag is scraped and transported axially by the spiral discharge device 7 with a diameter of 1.0 m to the cooling assembly 9 (the spiral rotation speed is 30 r / min). The high-temperature reduction slag is cooled to 180°C by the cooling assembly 9 (the cooling water flow rate is 1 m 3 / h, and the length of the cooling assembly 9 is 5 m), and the residue is obtained. The main phases of the residue are CaS, CaSiO3, Ca2SiO4, and SiO2.

[0094] The calculated zinc reduction volatilization rate is 92.1%, and the sulfur-fixing rate is 85.3%.

[0095] Example 3

[0096] (1) Preparation of spherical material

[0097] 30 kg of oxygen-sulfur mixed zinc ore is uniformly mixed with lime, high-volatile coal (carbonaceous reducing agent), and bentonite at a mass ratio of 100:10:15:3, wherein the molar ratio of CaO to ZnS in the mixed material is 1:1. The mixed material is prepared into pellets (pellet size 20 mm); the pellets are sent into an electric hot air drying box (60°C, 40 min) for drying treatment, and the spherical material (moisture content 4%) is obtained.

[0098] (2) The spherical material is put into a metal zinc recovery device (refer to FIGS. 1 to 3) for metal zinc recovery treatment, and the specific process is as follows: Figure 1 and Figure 2

[0099] The spherical material is uniformly laid on the front end of the preheating zone of the transmission device of the main furnace body 2 by the swing distributor 1, the material layer thickness is 200 mm, and the material is transmitted to the heating zone 4 at a low speed (rotation speed 1.5 r / h) by the roller group 8, and the reducing gas is blown into the preheating zone 4 to carry heat for preheating (the temperature of the heating zone 4 is controlled at 900°C), and the pre-reduction reaction is generated, and the combined water and volatile impurities on the surface of the spherical material are preliminarily removed.

[0100] Subsequently, the spherical material enters the high-temperature sulfur-fixing reduction zone 5 (1400°C constant temperature control), and the carbon powder is sprayed into the high-temperature sulfur-fixing reduction zone 5 through the reducing gas nozzle 10 (the total flow rate of the formed CO is 20 m 3 ​ / h, the temperature of the reducing gas is 800℃), under the action of the CO reducing gas atmosphere in the carbon powder stroke, the ZnO and ZnS are synchronously reduced to gaseous zinc (the reaction time is 40 min), and the sulfur element combines with Fe and Ca in the high-temperature reduction slag phase to form stable FeS / CaS slag phase.

[0101] The zinc vapor is transported to the zinc vapor condensing device 12 through the spiral flow guide rising flue 11 (the zinc rain temperature is 600℃, and the spraying flow rate is 1.2m 3 / min), Zn(g)→Zn(l) occurs, and the condensed liquid metal zinc is continuously cast into zinc ingot products through a rectifying device or an ingot casting device.

[0102] The other residual gas is discharged into the dust removal device 15 through the coal gas outlet channel 14, and further reduction gas dust removal is performed to obtain purified coal gas. The coal gas is sprayed into the main furnace body 2 from the reduction gas nozzle 10 through a coal gas recycling pipeline to participate in the zinc reduction reaction and the sulfur element solidification reaction again.

[0103] After the high-temperature sulfur fixation reduction reaction, the high-temperature reduction slag is axially scraped and transported to the cooling assembly 9 by the spiral unloading device 7 with a diameter of 1.0m (the spiral rotation speed is 50r / min). The high-temperature reduction slag is cooled to 150℃ by the cooling assembly 9 (the cooling water flow rate is 10m 3 / h, and the length of the cooling assembly 9 is 5m), and the residue is obtained. The main phases of the residue are CaS, FeS, CaSiO3, and SiO2.

[0104] It is calculated that the zinc reduction volatilization rate reaches 95.2%, and the sulfur fixation rate is 66.3%.

[0105] Comparative Example 1

[0106] Compared with Example 1, only the metal zinc recovery device is not used, and the metal zinc recovery treatment is performed by using a rotary kiln. Specifically:

[0107] 30kg of oxygen-sulfur mixed zinc ore is mixed with lime and high-volatile coal (carbonaceous reducing agent) at a ratio of 100:10:15, and the molar ratio of CaO to ZnS in the mixture is 1:1. After mixing, the mixture is sent into an electric heating air drying box (60℃, 40min) for drying treatment.

[0108] The dried material enters the rotary kiln (the high-temperature section is 1200℃), and the carbon powder and oxygen-enriched air are sprayed into the rotary kiln through the nozzle to form a reducing atmosphere, and under the action of the CO reducing atmosphere formed by the carbon powder, the ZnO is reduced to gaseous zinc (the reaction time is 60min), and the ZnS cannot be directly reduced. Since there is no good airtight environment, the sulfur element contacts with oxygen to produce part of low-concentration SO2.

[0109] After reduction, the rotary kiln slag is cooled to 150℃ by a cooling device (the cooling water flow rate is 10m3 / h, cooling device length is 5m), and residue is obtained. The main phases of the residue are CaO, ZnFe2O4, ZnS, CaSiO3 and SiO2.

[0110] The calculated zinc reduction volatilization rate is 72.2%, and the sulfur fixation rate is 56.2%.

[0111] Analysis Example 1

[0112] The zinc reduction volatilization rate and the sulfur fixation rate of Comparative Analysis Examples 1-3 and Comparative Example 1 are compared, and the comparison results are shown in Table 1.

[0113] Table 1 Comparison of zinc reduction volatilization rate and sulfur fixation rate of Examples 1-3 and Comparative Example 1

[0114]

[0115] According to Table 1, compared with the traditional pyrometallurgical zinc smelting process, the metal zinc recovery device and the application method thereof can realize multi-temperature zone and multi-atmosphere controllable adjustment, cooperate with the sulfur-fixing agent (CaO, CaCO3) to realize one-step extraction and direct recovery of zinc from complex minerals, break through the technical difficulties such as the inability of ZnS to be directly reduced and the inability of Zn vapor to be directly recovered and utilized in the conventional pyrometallurgical equipment, simultaneously realize efficient sulfur fixation and metal zinc reduction, improve the resource utilization rate, reduce the emission of SO2 and other waste gas, and help to reduce environmental pollution. The selection range of raw materials is wide, the operation is convenient and safe, energy saving and environmental protection, and has a wide application prospect.

[0116] In summary, the above technical scheme of the present application is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A metal zinc recovery device, characterized by, The metal zinc recovery device comprises a main furnace body and a flue gas treatment assembly; The main furnace body comprises a feeding area, a heating area, a high-temperature sulfur-fixing reduction area and a discharging area arranged in sequence according to the spherical material flow direction; an ascending flue is arranged at the upper portion of the main furnace body; the reduction gas nozzles are arranged in the circumferential direction of the middle portion of the main furnace body and are communicated with the high-temperature sulfur-fixing reduction area; a group of supporting rollers and a transmission device capable of driving the spherical material to rotate are arranged at the bottom of the feeding area, the heating area, the high-temperature sulfur-fixing reduction area and the discharging area; the feeding area is provided with a swing distributor; and the discharging area is provided with a cooling assembly; The flue gas treatment assembly comprises a zinc vapor condensing device and a dust removal device connected in series; the zinc vapor condensing device is communicated with the main furnace body through the ascending flue.

2. The metal zinc recovery device according to claim 1, characterized by, A coal gas outlet passage is arranged on one side of the dust removal device; the dust removal device is communicated with the zinc vapor condensing device through the coal gas outlet passage; A coal gas recycling pipeline is arranged at the top of the other side of the dust removal device; the two ends of the coal gas recycling pipeline are communicated with the dust removal device and the reduction gas nozzle respectively.

3. The metal zinc recovery device according to claim 1, characterized by, The number of the reduction gas nozzles is greater than or equal to 2; and the reduction gas nozzles are uniformly distributed in the circumferential direction of the middle portion of the main furnace body.

4. The metal zinc recovery apparatus according to claim 3, characterized by The cross-sectional area of the reducing gas nozzle is 50 to 150 mm 2 .

5. The metal zinc recovery device according to claim 1, characterized by The cooling assembly is of a water-cooled jacket type structure; and the inner wall of the cooling assembly is provided with a high-temperature-resistant ceramic coating.

6. The metal zinc recovery device according to claim 5, characterized by The length of the cooling assembly is 2-10 m.

7. The metal zinc recovery device according to claim 1, characterized by The discharging area is further provided with a spiral discharging device; the diameter of the spiral blade of the spiral discharging device is 0.5-2.0 m.

8. Use of the metal zinc recovery device according to any one of claims 1 to 7 for recovering metal zinc, characterized in that, The zinc-containing mineral product is mixed with lime, carbonaceous reducing agent and bentonite to form pellets; the particle size of the pellets is 11-20 mm; The pellets are subjected to drying treatment to obtain spherical materials; the water content of the spherical materials is less than 5%; The spherical materials are put into the metal zinc recovery device to obtain metal zinc; The residence time of the ball material in the metal zinc recovery device is 20-40 min, the material layer thickness of the ball material is 50-200 mm; the working temperature of the heating zone of the metal zinc recovery device is 500-900 DEG C; the working temperature of the high-temperature sulfur-fixing reduction zone of the metal zinc recovery device is 900-1400 DEG C; when the metal zinc recovery device works, the reducing gas is sprayed to the ball material through the reducing gas nozzle of the metal zinc recovery device, the temperature of the reducing gas is 400-800 DEG C, the total flow of the reducing gas is 20-150 m 3 / h. The stability of the residue after the cooling treatment of the cooling assembly of the metal zinc recovery device is less than or equal to 200 DEG C; The temperature of the zinc rain of the zinc vapor condensing device of the metal zinc recovery device is 590-610 ℃; the spraying flow of the zinc rain is 0.6-1.2 m 3 / min.

9. Use according to claim 8, characterized in that, The rotating speed of the spherical materials in the main furnace body of the metal zinc recovery device is 1.5-5 r / h; The jacket cooling water flow of the cooling assembly of the spiral discharging device of the metal zinc recovery device is 1-10 m 3 / h; The working spiral rotating speed of the spiral discharging device of the metal zinc recovery device is 5-30 r / min.

10. Use according to claim 8, characterized in that, The molar ratio of CaO to ZnS in the pellets is 1-1.5; The zinc-containing mineral product comprises one or more of complex oxygen-sulfur mixed zinc ore, lead-zinc sulfide concentrate, lead-zinc sulfide calcine, lead-zinc oxide ore and urban mineral product.

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