System for treating white smoke dust and blast furnace secondary ash through rotary hearth furnace

Abstract

The utility model discloses a system for treating white smoke dust and blast furnace secondary ash by a rotary hearth furnace, which solves the technical problem that the white smoke dust and the blast furnace secondary ash in the prior art cannot realize resource comprehensive utilization, and simultaneously realizes resource utilization of the blast furnace secondary ash of an iron and steel plant and the white smoke dust of a copper smelting plant. And valuable metals such as lead, zinc, gold, iron and copper in the blast furnace secondary ash and the white smoke dust are comprehensively recovered, so that synergistic high-value utilization of the steel dust and the colored dust is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical resource utilization, and more specifically, to a system for treating white smoke and secondary ash of a blast furnace in a rotary hearth furnace. Background Art

[0002] Steel smelting goes through three major processes: sintering, ironmaking and steelmaking. The output of blast furnace secondary ash produced in the ironmaking process is relatively large. For every ton of pig iron produced, 10-11 kg of blast furnace secondary ash is produced. The domestic blast furnace pig iron output is about 870 million tons, and the amount of blast furnace secondary ash produced is about 8.7 million tons. The blast furnace secondary ash contains elements such as iron, zinc, carbon, and chlorine. At present, it is mainly disposed of in a rotary hearth furnace or rotary kiln together with dust removal ash from other steel mills. White smoke is a solid byproduct produced during the copper smelting process. It contains valuable elements such as Cu, Zn, Pb, Au, Ag, and Bi, and is a potential secondary resource. At present, the resource utilization technology is mainly based on the wet process, which is divided into three types: water leaching, acid leaching, and ammonia leaching. Among them, the acid leaching process is more commonly used. The core of the treatment process of white smoke is arsenic removal, and at the same time, it comprehensively recovers various valuable elements such as copper, lead, and zinc. However, the cost of arsenic removal is high, and the added value of arsenic trioxide products obtained by arsenic removal from white smoke is low. The market space is limited. Most companies in the industry landfill the arsenic-containing sludge after the valuable metals are extracted from white smoke. How to make comprehensive resource utilization of white smoke and secondary ash from blast furnaces is a major problem currently faced.

[0003] The document with patent number CN202311654896.0 discloses a method for preparing a high-arsenic-containing arsenic-iron alloy, a high-arsenic-containing arsenic-iron alloy and its application, including the following steps: vacuum ball milling arsenic powder and iron powder under protective atmosphere conditions to obtain arsenic-iron powder; the molar ratio of the arsenic powder to the iron powder is 0.8-1.5:1; the arsenic-iron powder is mixed with a ferrous agent to obtain an alloy base material, and the amount of the ferrous agent added accounts for 10% to 40% of the total mass of the arsenic-iron powder; the alloy base material is sintered by high-temperature hot pressing to obtain an arsenic-iron alloy. However, the raw materials of this invention are arsenic powder and iron powder, which are relatively expensive.

[0004] The document with patent number CN201911254668.8 discloses a method for resource utilization of arsenic filter cake and white smoke, which belongs to the technical field of comprehensive utilization of non-ferrous metal smelting resources. The method comprises the following steps: a. leaching white smoke; b. cooling and filtering, filtering the feed liquid obtained in step a to obtain lead-rich slag and white smoke leaching liquid respectively; c. pressurized leaching of arsenic filter cake, slurrying the arsenic filter cake and the white smoke leaching liquid obtained in step b, and then pressurized leaching in an autoclave. After the reaction is completed, filtering is performed to obtain leaching liquid and high-pressure slag, which is rich in copper and sulfur and is returned to the smelting system as a raw material; d. sulfur dioxide reduction, reducing the leaching liquid obtained in step c with sulfur dioxide to obtain reduced liquid and crude As2O3 crystals; e. transferring the crude As2O3 crystals into a crystallization tank, stirring and washing with pure water, controlling the water washing temperature to 20-60°C, and obtaining national standard 1-grade arsenic trioxide after filtering and drying; f. recovering rhenium from the reduced liquid obtained in step d through an ion exchange process or an extraction process to obtain an ammonium rhenate product and a reduced final liquid, and the reduced final liquid is returned to the white smoke leaching. However, this process is a fully wet process for treating white smoke, which has a complicated process flow and causes serious environmental pollution.

[0005] The document with patent number CN202110864057.6 discloses a method for comprehensive recovery of valuable elements by combining blast furnace bag ash and sintering machine head ash, comprising the following steps: S01: slurrying the blast furnace bag ash; S02: magnetic separation using a high gradient magnetic field to obtain iron concentrate, mineral water A and slag A; S03: carbon flotation of the slag A, filtering the flotation concentrate to obtain carbon concentrate, filtering the flotation tailings to obtain zinc-rich material and the remaining mineral water B, which is recycled in the flotation process; S04: slurrying the mineral water A with the sintering machine head ash after recycling;

[0006] S05: Use magnetic separation process to select iron concentrate to obtain iron concentrate and tailings B; S06: Filter tailings B to obtain lead and silver concentrate and filtered water; S07: Add different purification and impurity removal agents to the filtered water to purify and remove heavy metals and other organic elements and enter the evaporator for evaporation to obtain potassium chloride; S08: The obtained distilled water is circulated to step S01. However, the process of flotation and wet process is long. Utility Model Content

[0007] The purpose of the utility model is to provide a system for treating white smoke and secondary ash of blast furnaces in a rotary hearth furnace, which solves the technical problem that white smoke and secondary ash of blast furnaces in the prior art cannot be comprehensively utilized as resources, and at the same time realizes the resource utilization of secondary ash of blast furnaces in steel plants and white smoke in copper smelters, comprehensively recovers valuable metals such as lead, zinc, gold, iron, and copper in secondary ash and white smoke from blast furnaces, and realizes the coordinated high-value utilization of steel dust and non-ferrous dust.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides a system for treating white smoke and secondary ash of blast furnace by a rotary hearth furnace, comprising:

[0010] A water-washing copper removal device is used to wash and dissolve the copper element in the white smoke; the water-washing copper removal device is respectively connected to the smoke bin, the water storage tank and the acid storage tank;

[0011] The plate and frame filter press is connected to the water-washing copper removal device and is used to filter the solution after the water-washing copper removal device is washed and dissolved;

[0012] An evaporation crystallization system is used to evaporate and crystallize the copper sulfate solution obtained by the plate and frame filter press; the evaporation crystallization system is connected to the filtrate outlet of the plate and frame filter press through a pipeline;

[0013] A mixer is used to evenly mix the filter cake after filtration by the plate and frame filter press with the secondary ash from the blast furnace and calcium chloride; the mixer is connected to the filter cake outlet of the plate and frame filter press through a belt;

[0014] A ball press is used to press the material mixed by the mixer into balls, and the ball press is connected to the mixer through a belt;

[0015] A dryer, used to dry the pellets pressed by the pellet press, and the dryer is connected to the pellet press through a belt;

[0016] A rotary hearth furnace is used to roast the materials dried by the dryer; the furnace of the rotary hearth furnace is provided with a loading and unloading area, a chlorination roasting area, and a reduction roasting area in sequence; the chlorination roasting area is provided with a flue for collecting gold-rich materials; the reduction roasting area includes a roasting area 1 and a roasting area 2; the roasting area 1 is provided with a flue for collecting lead concentrate;

[0017] The system for treating white smoke and secondary ash from a blast furnace using a rotary hearth furnace is used to execute the method for treating white smoke and secondary ash from a blast furnace using a rotary hearth furnace as described in the first aspect of the utility model.

[0018] As one aspect of the system for treating white smoke and secondary ash from a blast furnace using a rotary hearth furnace according to the utility model, the water-washing copper removal device is a sealed tank with a stirrer.

[0019] As one aspect of the system for treating white smoke and secondary ash from blast furnace using a rotary hearth furnace of the utility model, the system also includes an electric furnace connected to the pellet outlet of the rotary hearth furnace.

[0020] By adopting the above technical solution, the utility model has the following advantages:

[0021] The utility model provides a system for treating white smoke and secondary ash from blast furnaces in a rotary hearth furnace. In the process of treating white smoke and secondary ash from blast furnaces, calcium chloride is added in the mixing process to form balls, which simultaneously plays the role of a binder and the chlorine element required for chlorination roasting, thereby eliminating the process of externally preparing a binder for treating metallurgical dust and mud in a conventional rotary hearth furnace in a steel plant. The utility model utilizes the low volatilization temperature of zinc and gold chlorides, and sets a chlorination roasting zone in the rotary hearth furnace to recover gold and zinc through chlorination roasting to obtain high-value gold-rich materials. The lead element volatilizes in the reduction zone to obtain lead concentrate with high lead content. The metallized pellets in the rotary hearth furnace are melted to obtain arsenic-iron alloys, and one process production line achieves the effect of comprehensive recovery of multiple metals. The utility model realizes the resource utilization of secondary ash from blast furnaces of steel plants and white smoke from copper smelting through water washing and rotary hearth furnace and electric furnace processes. The process flow is simple, and valuable metals such as gold, zinc and lead can be comprehensively recovered to finally obtain ferroarsenic alloy with high economic value. At the same time, the utility model realizes the resource utilization of secondary ash from blast furnaces of steel plants and white smoke from copper smelters, and valuable metals such as lead, zinc, gold, iron and copper in secondary ash and white smoke from blast furnaces are comprehensively recovered, thereby realizing the coordinated high-value utilization of steel dust sludge and non-ferrous dust sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0023] Figure 1 It is a process flow chart of a method for treating white smoke and secondary ash from a blast furnace using a rotary hearth furnace;

[0024] Figure 2 It is a schematic diagram of the structure of the rotary hearth furnace of the utility model for treating white smoke and secondary ash from blast furnace;

[0025] Figure 3 It is a schematic diagram of the partitions of the rotary hearth furnace of the utility model;

[0026] In the figure, 1. water washing and copper removal device, 2. plate and frame filter press, 3. evaporation crystallization system, 4. mixer, 5. ball press, 6. dryer, 7. rotary hearth furnace, 71. loading and unloading area, 72. chlorination roasting area, 73. roasting area 1, 74. roasting area 2, 75. gold-rich material collection flue, 76. lead concentrate collection flue, 8. electric furnace. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is specifically described below in conjunction with the drawings in the specification. The detailed features and advantages of the present invention are described in detail in the specific implementation mode. The content is sufficient to enable any technical personnel in this field to understand the technical content of the present invention and implement it accordingly. According to the description, claims and drawings disclosed in this specification, technical personnel in this field can easily understand the relevant purposes and advantages of the present invention.

[0028] Figure 1 The process flow chart of the method for treating white smoke and secondary ash from blast furnace in rotary hearth furnace is shown. The raw materials of the utility model are secondary ash from blast furnace of steel plant and white smoke from copper smelter, and the specific components are shown in Table 1 and Table 2 below:

[0029] Table 1: Blast furnace secondary ash composition (%)

[0030] Material Name TFe Cl C Zn Pb Blast furnace secondary ash 34～38 2～5 15～20 2～4 0.4～0.8

[0031] Table 2: White smoke composition (%)

[0032] Element Au Pb Zn Cu As content 4~7g / t 13～16 1～2 8～12 9～13

[0033] A method for treating white smoke and secondary ash from a rotary hearth furnace is as follows: Figure 1 As shown, the following steps are included:

[0034] S1. The white smoke is washed in a water-washing copper removal device and then sent to a plate-and-frame filter press for filtration to obtain a filter cake and a copper sulfate solution, and the copper sulfate solution is evaporated and crystallized to obtain copper sulfate crystals; since the copper element in the white smoke mainly exists in the physical form of copper sulfate (copper sulfate), the lead element exists in the physical form of lead sulfate and lead oxide, zinc exists in the form of zinc oxide, gold exists in the form of a single substance, and arsenic mainly exists in the form of As2O3 and As2S3; copper sulfate is easily soluble in water in a neutral or weakly acidic system with a solubility of 20%, and lead sulfate, lead oxide, zinc oxide, single gold, As2O3, and As2S3 are insoluble in water at room temperature and in a neutral or weakly acidic system.

[0035] Wherein, S1 comprises the following steps:

[0036] S11. In the water-washing copper removal device, the white smoke is stirred and dissolved with water at a solid-liquid ratio of 1:6-7 for a certain period of time, and citric acid is added to keep the pH of the solution between 6-6.5 to obtain a solid-liquid mixture. Since copper sulfate is highly soluble in water, it enters the solution, while elements such as lead, zinc, gold, and arsenic are insoluble in water and remain in the solid phase. The water-washing copper removal device in S11 is a sealed tank with a stirrer, and the stirring and dissolving time is 30-50 minutes.

[0037] S12. The solid-liquid mixture is sent to a plate and frame filter press for filtration to obtain a copper-free filter cake and a copper sulfate solution; the composition of the filter cake after copper removal in S12 is shown in Table 3 below:

[0038] Table 3: Filter cake composition (dry basis) %

[0039] Element Au Pb Zn Cu As content 5.5-10g / t 13.7-17.5 l-2.2 2.5-4 9.5-14.5

[0040] The water content of the filter cake after copper removal is about 25%.

[0041] S13. The copper-removed filter cake is mixed with the secondary ash of the blast furnace and pressed into balls, and the copper sulfate solution is evaporated and crystallized to obtain copper sulfate crystals.

[0042] S2. The filter cake and secondary ash from the blast furnace are added with calcium chloride additives to perform mixing, pelletizing and drying processes;

[0043] S2 includes the following specific steps:

[0044] S21. The filter cake, the secondary ash of the blast furnace, and the additive calcium chloride are uniformly mixed in a ratio of 100:40-50:5-8;

[0045] S22. The mixed materials are pressed into pellets by a pellet press, and the pellets are dried by a dryer. The main components of the pellets are shown in Table 4 below:

[0046] Table 4: Main components of pellets

[0047] TFe Cl C Zn Pb Cu As Au 22～25 2～4 l0～13 2～4 4～6 0.5～l 3～5 3~4g / t

[0048] The additive calcium chloride in S2l has strong viscosity and acts as a binder. It can also supplement the chlorine element in the pellets. Chlorine is a key element for chlorination roasting in a rotary hearth furnace.

[0049] S3. The dried material enters the rotary hearth furnace for roasting, and lead concentrate and gold-rich material are obtained through the flue, and metallized pellets are obtained at the same time. The metallized pellets are smelted in an electric furnace to obtain arsenic-iron alloy and slag.

[0050] Among them, S3 includes the following specific steps:

[0051] S31 using the blast furnace secondary ash carbon as a reducing agent, drying the material into the rotary hearth furnace for chlorination roasting and reduction roasting;

[0052] Figure 3 The rotary hearth furnace 7 is divided into a loading and unloading area 71, a chlorination roasting area 72, and a reduction roasting area. The reduction roasting area is divided into a roasting area 1 73 and a roasting area 2 74. The temperature of the chlorination roasting area is controlled at 400-600°C, and the volatilization time is 25-30 minutes. In the chlorination roasting area, the chlorination volatilization of gold chloride and zinc chloride is mainly carried out, and a small amount of lead volatilization is also carried out.

[0053] S32. The chlorination roasting zone 72 is provided with a gold-rich material collecting flue 75, and gold chloride and zinc chloride are volatilized and collected into gold-rich material through the gold-rich material collecting flue 75; metallized pellets are obtained through reduction roasting, and the reduction roasting zone is divided into a roasting zone 1 73 and a roasting zone 2 74. The temperature of the roasting zone 1 73 is 800-1000° C., and the roasting time is 15-20 min. The reduction roasting zone realizes the reduction volatilization of most of the lead and the pre-reduction of iron. The lead is finally collected in the form of lead oxide through the lead concentrate collecting flue 76 of the roasting zone 1 73 to obtain lead concentrate. The temperature of the roasting zone 2 74 is set to 1250-1300° C., and the roasting time is 10-15 min. The lead concentrate is collected through the lead concentrate collecting flue 76 of the reduction roasting to obtain lead concentrate; the iron and arsenic in this zone are reduced to metals, and the iron and arsenic have a strong binding ability and exist in the metallized pellets in the form of solid solution, and the metallization rate of iron is above 85%. In addition, the volatilization rate of gold and zinc in chlorination roasting is more than 90%, the reduction volatilization rate of lead is more than 92%, the gold content of the gold-rich powder is 80-110g / ton, the zinc content is 45-60%, and the lead grade in the lead concentrate is 92-95%.

[0054] S33. The composition of metallized pellets is 33-40% total iron and 4.5-8.0% arsenic. The metallized pellets are smelted into ferroarsenic alloy in an electric furnace at a smelting temperature of 1600°C for 1-2 hours. The slag and iron are separated in the electric furnace to obtain ferroarsenic alloy and slag. The ferroarsenic alloy obtained from the electric furnace has an iron content of 80-90% and an arsenic content of 8-17%. The iron recovery rate is more than 95%, and the arsenic recovery rate is more than 90%.

[0055] Combination Figure 2As shown, a system for treating white smoke and secondary ash of blast furnace in a rotary hearth furnace is used to perform the above-mentioned method for treating white smoke and secondary ash of blast furnace in a rotary hearth furnace, which includes a water-washing copper removal device 1, a plate-frame filter press 2, an evaporation crystallization system 3, a mixer 4, a briquetting machine 5, a drying machine 6, and a rotary hearth furnace 7. The water-washing copper removal device 1 is used to wash and dissolve the copper element in the white smoke; the water-washing copper removal device 1 is connected to the smoke bin, the water storage tank, and the acid storage tank respectively. The plate-frame filter press 2 is connected to the water-washing copper removal device 1 to filter the solution after the water-washing copper removal device is washed and dissolved. The evaporation crystallization system 3 is used to evaporate and crystallize the copper sulfate solution obtained by the plate-frame filter press 2; the evaporation crystallization system 3 is connected to the filtrate outlet of the plate-frame filter press 2 through a pipeline. The mixer 4 is used to evenly mix the filter cake after the plate-frame filter press 2 is filtered with the secondary ash of blast furnace and calcium chloride; the mixer 4 is connected to the filter cake outlet of the plate-frame filter press 2 through a belt. The briquette press 5 is used to press the material mixed by the mixer 4 into pellets, and the briquette press 5 is connected to the mixer 4 by a belt. The dryer 6 is used to dry the pellets pressed by the briquette press 5, and the dryer 6 is connected to the briquette press 5 by a belt. The rotary hearth furnace 7 is used to roast the material dried by the dryer 6; the furnace of the rotary hearth furnace 7 is sequentially provided with a loading and unloading area 71, a chlorination roasting area 72, and a reduction roasting area; the chlorination roasting area 72 is provided with a gold-rich material collection flue 75; the reduction roasting area includes a roasting area 1 73 and a roasting area 2 74; the roasting area 1 73 is provided with a lead concentrate collection flue 76.

[0056] In a specific embodiment, the water-washing copper removal device 1 is a sealed tank with a stirrer.

[0057] The system for treating white smoke and secondary ash from blast furnace by rotary hearth furnace further comprises an electric furnace 8 connected to the pellet outlet of rotary hearth furnace for recycling metallized pellets.

[0058] The present invention is further explained below through specific embodiments:

[0059] Example 1

[0060] The lead content of white smoke is 13%, the gold content is 4g / ton, the zinc content is 2%, the copper content is 8%, the arsenic content is 9%, and the solid-liquid ratio is 6 for water washing to remove copper. Citric acid is added to ensure that the solution pH is 6.8. The copper removal time is 35min. The copper sulfate solution is subjected to an evaporation crystallization process to obtain copper sulfate. The filter cake after copper removal is used for secondary pelletizing with a blast furnace with an iron content of 34%, a chlorine content of 2.2%, a carbon content of 15%, a zinc content of 2%, and a lead content of 0.44%. Calcium chloride is added as an additive and a binder. The ratio of blast furnace secondary ash, filter cake and calcium chloride is 100:40:5. The pellets are dried and disposed of in a rotary hearth furnace. The chlorination roasting time in the rotary hearth furnace is 430°C, the volatilization time is 30 minutes, the temperature of the first roasting zone is 820°C, the time is 20 minutes, the temperature of the second roasting zone is 1250°C, the time is 15 minutes. After chlorination roasting and reduction roasting in the rotary hearth furnace, the gold-rich material has a gold grade of 80g / ton and a zinc content of 45%. The lead concentrate has a lead grade of 92%. The iron content of the metallized pellets is 33.5%, and the arsenic content is 4.58%. The metallized pellets are smelted with arsenic-iron alloy in an electric furnace at a temperature of 1600°C for 1 hour to obtain an arsenic-iron alloy with an arsenic content of 8%, an iron content of 88%, an arsenic recovery rate of 90.2%, and an iron recovery rate of 95.4%.

[0061] Example 2

[0062] The lead content of white smoke is 14.5%, the gold content is 5.8g / ton, the zinc content is 1.5%, the copper content is 10%, the arsenic content is 11.5%, and the solid-liquid ratio is 6.5 for water washing to remove copper. Citric acid is added to ensure that the solution pH is 6.3. The copper removal time is 43min. The copper sulfate solution is obtained by evaporation and crystallization process to obtain copper sulfate. The filter cake after copper removal is used for secondary pelletizing with a blast furnace with an iron content of 36%, a chlorine content of 3.5%, a carbon content of 18%, a zinc content of 3%, and a lead content of 0.6%. Calcium chloride is added as an additive and a binder. The ratio of blast furnace secondary ash, filter cake and calcium chloride is 100:45:5. The pellets are dried and then sintered in a rotary hearth furnace. Treatment, rotary hearth furnace chlorination roasting time is 510℃, volatilization time is 25min, roasting zone 1 temperature is 910℃, time is 17min, roasting zone 2 temperature is 1280℃, time is 13min. After chlorination roasting and reduction roasting in the rotary hearth furnace, the gold-rich material has a gold grade of 96g / ton and a zinc content of 54.6%. The lead concentrate has a lead grade of 94%. The iron content of the metallized pellets is 36%, and the arsenic content is 6.3%. The metallized pellets are smelted with arsenic-iron alloy in an electric furnace at a temperature of 1600℃ for 1.5h to obtain arsenic-iron alloy with an arsenic content of 13%, an iron content of 84%, an arsenic recovery rate of 91.3%, and an iron recovery rate of 96.8%.

[0063] Example 3

[0064] The lead content of white smoke is 16%, the gold content is 7g / ton, the zinc content is 2%, the copper content is 11.8%, and the arsenic content is 13%. The solid-liquid ratio is 7 for water washing to remove copper, and citric acid is added to ensure that the solution pH is 6. The copper removal time is 50min. The copper sulfate solution is obtained by evaporation and crystallization process to obtain copper sulfate. The filter cake after copper removal is used for secondary pelletizing with a blast furnace with an iron content of 38%, a chlorine content of 5%, a carbon content of 20%, a zinc content of 4%, and a lead content of 0.8%. Calcium chloride is added as an additive and a binder. The ratio of blast furnace secondary ash, filter cake and calcium chloride is 100:50:5. The pellets are dried and disposed of in a rotary hearth furnace. The furnace chlorination roasting time is 600°C, the volatilization time is 20min, the temperature of the roasting zone 1 is 100°C, the time is 15min, the temperature of the roasting zone 2 is 1300°C, and the time is 10min. After chlorination roasting and reduction roasting in a rotary hearth furnace, the gold-rich material obtained has a gold grade of 108g / ton and a zinc content of 59.6%. The lead concentrate has a lead grade of 95%, the metallized pellets have an iron content of 39.6%, and an arsenic content of 8%. The metallized pellets are smelted in an electric furnace with an arsenic-iron alloy at a furnace temperature of 1600°C for 2h to obtain an arsenic-iron alloy with an arsenic content of 16.3%, an iron content of 82%, an arsenic recovery rate of 92.8%, and an iron recovery rate of 97%.

[0065] Finally, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the present invention and are not used as a limitation of the present invention. Various equivalent changes or substitutions can be made without departing from the concept of the present invention. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

1. A system for treating white smoke and secondary ash from blast furnaces using a rotary hearth furnace, characterized in that: include A water-washing copper removal device is used to wash and dissolve the copper element in the white smoke; the water-washing copper removal device is respectively connected to the smoke bin, the water storage tank and the acid storage tank; The plate and frame filter press is connected to the water-washing copper removal device and is used to filter the solution after the water-washing copper removal device is washed and dissolved; Evaporation and crystallization system, used to evaporate and crystallize the copper sulfate solution obtained by the plate and frame filter press; The evaporation crystallization system is connected to the filtrate outlet of the plate and frame filter press through a pipeline; A mixer is used to evenly mix the filter cake after filtration by the plate and frame filter press with the secondary ash from the blast furnace and calcium chloride; the mixer is connected to the filter cake outlet of the plate and frame filter press through a belt; A ball press is used to press the material mixed by the mixer into balls, and the ball press is connected to the mixer through a belt; A dryer, used to dry the pellets pressed by the pellet press, and the dryer is connected to the pellet press through a belt; A rotary hearth furnace is used to roast the materials dried by the dryer; the furnace of the rotary hearth furnace is provided with a loading and unloading area, a chlorination roasting area, and a reduction roasting area in sequence; the chlorination roasting area is provided with a flue for collecting gold-rich materials; the reduction roasting area includes a roasting area 1 and a roasting area 2; the roasting area 1 is provided with a flue for collecting lead concentrate.

2. A system for treating white smoke and secondary ash from a rotary hearth furnace as claimed in claim 1, characterized in that: The water-washing copper removal device is a sealed tank with a stirrer.

3. A system for treating white smoke and secondary ash from a rotary hearth furnace as claimed in claim 1, characterized in that: Also included is an electric furnace connected to the pellet outlet of the rotary hearth furnace.

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