Electroplating sludge waste resource utilization system and process method

Abstract

The application discloses a system and a process method for resource utilization of electroplating sludge waste, and the electroplating sludge is treated by the resource utilization system for electroplating sludge, the sludge is dried by a sludge drying unit, then the dried electroplating sludge is mixed with other materials by a first material mixing unit, and then the mixture is subjected to oxidation roasting treatment by a first roasting unit, so that the hydroxides of various metal elements are converted into stable oxides, and the sludge is harmlessly and reduced; the metal oxide of the sludge after the harmless and reduction treatment is mixed with sulfides by a second material mixing unit, and then is subjected to selective sulfidation reaction in an electric furnace by an electric furnace smelting unit, so that low nickel-copper product is prepared, and other rare and precious metals are comprehensively recovered by being sulfidized into the nickel-copper product, and the system is reliable in implementation and can realize resource utilization treatment of waste at low cost.

Description

Technical Field

[0001] This invention relates to the field of metal waste resource utilization technology, and in particular to a system and process for the resource utilization of electroplating sludge waste. Background Technology

[0002] Electroplating sludge contains heavy metals such as Ni, Cu, Cr, and Zn, as well as base metals such as Fe, which exist in the form of hydroxides and some soluble salts. It is extremely easy to cause soil pollution and is a typical type of hazardous waste.

[0003] Currently, the existing pyrometallurgical process for treating electroplating sludge containing mainly nickel and copper metals mainly involves using a submerged arc furnace or blast furnace to perform high-temperature carbothermic reduction with a carbonaceous reducing agent to produce nickel, copper, and iron alloy products. For example, the invention patent application publication number CN 110343854A, "A Method for Producing Copper-Nickel-Iron Alloys from Copper-, Nickel, and Iron Electroplating Sludge," has the following main drawback:

[0004] 1. Nickel, copper and iron alloy products are non-standard products with low nickel and copper content and excessive impurities such as S, P and Cr. They cannot be used directly (due to the small market area). If they are to be used, they need to be refined and separated again, which is difficult and costly.

[0005] 2. Carbothermic reduction smelting involves a reduction reaction temperature of over 1500℃, resulting in high energy consumption and high production costs.

[0006] 3. The recovery rate of zinc metal element is low.

[0007] Therefore, how to improve the resource utilization of electroplating sludge and simplify the process and reduce production costs through a simple and effective resource utilization system is a very important issue. Summary of the Invention

[0008] In view of this, the purpose of this invention is to provide a reliable, simple, and highly efficient system and process for the resource utilization of electroplating sludge waste.

[0009] To achieve the above-mentioned technical objectives, the technical solution adopted by this invention is as follows:

[0010] A system for the resource utilization of electroplating sludge waste, comprising:

[0011] The sludge drying unit is used to dry electroplating sludge.

[0012] The first material blending unit has an inlet and an outlet. The inlet of the first material blending unit is used to input electroplating sludge that has been dried by the sludge drying unit and other preset formula materials.

[0013] The first roasting unit has a feed inlet, a discharge outlet and a flue gas outlet. The feed inlet of the first roasting unit is connected to the discharge outlet of the first material blending unit and is used to receive the material blended and output by the first material blending unit.

[0014] The second material blending unit has an inlet and an outlet. The inlet of the second material blending unit is used to input the material after roasting by the first roasting unit and other preset formula materials.

[0015] The flue gas treatment unit has its input end connected to the flue gas outlet of the first calcination unit;

[0016] An electric furnace smelting unit has its input end connected to the outlet of a second material mixing unit and is used to smelt the input material. The electric furnace smelting unit also has a product outlet, a slag outlet and a gas outlet. The gas outlet of the electric furnace smelting unit is connected to the input end of a flue gas treatment unit.

[0017] The product post-processing unit has its input end connected to the discharge port of the electric furnace smelting unit and is used to cool and crush the material output from the product discharge port of the electric furnace smelting unit.

[0018] The slag water crushing unit has its input end connected to the slag outlet of the electric furnace smelting unit and is used to perform water crushing treatment on the slag output from the slag outlet of the electric furnace smelting unit.

[0019] As one possible implementation, the discharge port of the sludge drying unit described in this solution is further connected to the inlet of the first material blending unit via a belt conveyor.

[0020] As one possible implementation, the discharge port of the first material blending unit is connected to the feed port of the first roasting unit via a belt conveyor, and the flue gas outlet of the first roasting unit and the gas outlet of the electric furnace smelting unit are both connected to the input end of the flue gas treatment unit via steel pipes.

[0021] As one possible implementation, the electric furnace smelting unit described in this solution is an electric arc furnace or a submerged arc furnace.

[0022] As one possible implementation, this solution further includes a first hot-loading mechanism or a first cold-loading mechanism for assisting material transfer between the first roasting unit and the second material mixing unit:

[0023] The first hot charging mechanism includes a gantry crane and a heat-insulating tank connected to the hook of the gantry crane. The heat-insulating tank is used to temporarily store the material output from the outlet of the first roasting unit. The gantry crane is used to lift the heat-insulating tank and drive the heat-insulating tank to be transferred between the outlet of the first roasting unit and the inlet of the second material mixing unit.

[0024] The first cold-loading mechanism includes a chain conveyor or a belt conveyor, with both ends of the chain conveyor or the belt conveyor extending to the discharge port of the first roasting unit and the inlet of the second material mixing unit, respectively.

[0025] As one possible implementation, this solution further includes a second hot charging mechanism or a second cold charging mechanism for auxiliary material transfer between the second material batching unit and the electric furnace smelting unit.

[0026] The first hot charging mechanism includes an insulated barrel and a trolley. The insulated barrel is used to contain the material output from the outlet of the second material mixing unit. The trolley has a transfer and placement platform for placing the insulated barrel. The trolley drives the insulated barrel to move between the outlet of the second material mixing unit and the inlet of the electric furnace smelting unit.

[0027] In addition, the second cold-loading mechanism includes a belt conveyor, the two ends of which extend to the discharge port of the second material matching unit and the feed port of the electric furnace smelting unit, respectively.

[0028] As one possible implementation, the product post-processing unit of this solution further includes a cooling device and a crushing device. The inlet of the cooling device is connected to the outlet of the electric furnace smelting unit, and the outlet of the cooling device is connected to the inlet of the crushing device.

[0029] As one possible implementation, the slag water crushing unit of this solution further includes a water crushing device, the inlet of which is connected to the slag outlet of the electric furnace smelting unit.

[0030] As one possible implementation, the flue gas treatment unit of this solution further includes a gravity dust collector, a cyclone dust collector, a bag filter dust collector, a desulfurization device, and a denitrification device connected in sequence. The discharge ports at the bottom of the gravity dust collector and the cyclone dust collector are respectively connected to the first material distribution unit, so that the dust settled by gravity in the gravity dust collector and the dust settled in the cyclone dust collector are transported back to the first material distribution unit.

[0031] Based on the above, the present invention also provides a method for resource utilization of electroplating sludge waste, which includes the following steps:

[0032] (1) Dry the electroplating sludge containing nickel and copper to make its moisture content between 20% and 30%;

[0033] (2) The dried electroplating sludge is mixed with coal powder and lime powder in a ratio of 80-90:6-12:4-8 and granulated into balls.

[0034] (3) The mixture formed into spherical shapes is subjected to oxidative roasting treatment;

[0035] (4) Sulfides are added to the mixture after oxidative roasting to make its sulfur content 20% to 25% of that of nickel, copper and iron metal sulfides, and then smelted to obtain low-grade nickel matte copper products. At the same time, filter residue by-products are also obtained, as well as zinc-containing flue gas is generated.

[0036] As a possible implementation method, the flue gas generated in step (3) of oxidation roasting and the flue gas generated in step (4) of smelting are sequentially treated with dust removal, desulfurization and denitrification before being discharged in compliance with standards.

[0037] As one possible implementation, the oxidation roasting temperature in step (3) of this scheme is 800-1200℃, and the melting temperature in step (4) is 800-1300℃, with a melting cycle of 2.5-6h / furnace.

[0038] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention treats electroplating sludge through an electroplating sludge preparation and resource utilization system to realize its resource utilization. The sludge is first dried by the sludge drying unit, and then the dried electroplating sludge is mixed with other materials by the first material matching unit. Then, the first roasting unit is used for oxidative roasting treatment to convert the hydroxides of various metal elements into stable oxides (oxidation-reduction reaction), thereby realizing the harmlessness and volume reduction of the sludge.

[0039] In addition, the metal oxides of the sludge after harmlessness and volume reduction in this scheme are combined with sulfides in the second material blending unit, and then smelted in the electric furnace smelting unit. Utilizing the affinity of each metal element for sulfur, a selective sulfidation reaction is carried out in the electric furnace to produce low-grade nickel matte copper. Other rare and precious metals are also sulfided and incorporated into the nickel matte copper product for comprehensive recycling. Zn metal elements are volatilized at high temperature and treated in the flue gas treatment unit. Zinc oxide is recovered through gravity dust collectors, cyclone dust collectors, and bag filters. Cr and some Fe elements and non-metallic oxides are incorporated into the slag, which is used for refractory materials or building materials, thus achieving efficient resource utilization of sludge. This scheme is not only reliable in implementation, but also achieves low-cost waste resource treatment by combining and connecting various existing metallurgical and chemical equipment. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a simplified schematic diagram of the system of the present invention. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figure 1 As shown in the figure, this embodiment of the present invention provides a system for the resource utilization of electroplating sludge waste, which includes:

[0044] Sludge drying unit 1 is used for drying electroplating sludge;

[0045] The first material mixing unit 2 has an inlet and an outlet. The inlet of the first material mixing unit 2 is used to input the electroplating sludge dried by the sludge drying unit 1 and other preset formula materials.

[0046] The first roasting unit 3 has a feed inlet, a discharge outlet and a flue gas outlet. The feed inlet of the first roasting unit 3 is connected to the discharge outlet of the first material matching unit 2 and is used to receive the material matched and output by the first material matching unit 3.

[0047] The second material mixing unit 4 has an inlet and an outlet. The inlet of the second material mixing unit 4 is used to input the material after roasting by the first roasting unit 3 and other preset formula materials.

[0048] The flue gas treatment unit 6 has its input end connected to the flue gas outlet of the first roasting unit 3;

[0049] The electric furnace smelting unit 5 has its input end connected to the discharge port of the second material matching unit 4 and is used to smelt the input material. The electric furnace smelting unit 5 also has a product discharge port, a slag discharge port and a gas outlet. The gas outlet of the electric furnace smelting unit 5 is connected to the input end of the flue gas treatment unit 6.

[0050] The post-processing unit 7 has its input end connected to the discharge port of the electric furnace melting unit 5, and is used to cool and crush the material output from the product discharge port of the electric furnace melting unit 5.

[0051] The slag water crushing unit 8 has its input end connected to the slag outlet of the electric furnace smelting unit 5, and is used to perform water crushing treatment on the slag output from the slag outlet of the electric furnace smelting unit 5.

[0052] In terms of the connection between units, the discharge port of the sludge drying unit 1 in this scheme is connected to the inlet of the first material matching unit 2 via a belt conveyor; the discharge port of the first material matching unit 2 is connected to the inlet of the first roasting unit 3 via a belt conveyor; the flue gas outlet of the first roasting unit 3 and the gas outlet of the electric furnace smelting unit 5 are both connected to the input end of the flue gas treatment unit via steel pipes.

[0053] Furthermore, in this solution, a first hot loading mechanism or a first cold loading mechanism for assisting material transfer is provided between the first roasting unit 1 and the second material mixing unit 4: that is, when the process requires hot loading to transfer materials, the hot loading mechanism is selected; when cold loading is required, there is no need for heat preservation, and the cold loading mechanism is selected.

[0054] The first hot-loading mechanism includes a gantry crane and an insulated tank connected to the hook of the gantry crane. The insulated tank is used to temporarily store the material output from the outlet of the first roasting unit. The gantry crane is used to lift the insulated tank and drive it to be transferred between the outlet of the first roasting unit and the inlet of the second material mixing unit. Since the gantry crane is a conventional factory transfer device and the insulated tank is a cylindrical structure with an open top, it is also a conventional factory temporary storage and transfer device. Those skilled in the art are already familiar with it, so it will not be described in detail in this application.

[0055] Regarding cold loading, in this embodiment, the first cold loading mechanism includes a chain conveyor or a belt conveyor, with both ends of the chain conveyor or the belt conveyor extending to the discharge port of the first roasting unit and the inlet of the second material matching unit, respectively.

[0056] Similarly, in this solution, a second hot charging mechanism or a second cold charging mechanism is provided between the second material batching unit and the electric furnace smelting unit to assist in material transfer: that is, when the process requires hot charging to transfer materials, the hot charging mechanism is selected; when cold charging is required, there is no need for heat preservation, and the cold charging mechanism is selected.

[0057] The first hot charging mechanism includes an insulated barrel and a trolley. The insulated barrel is used to contain the material output from the outlet of the second material mixing unit. The trolley has a transfer and placement platform for placing the insulated barrel. The trolley drives the insulated barrel to move between the outlet of the second material mixing unit and the inlet of the electric furnace smelting unit. The insulated barrel mentioned here is a cylindrical structure with an open structure at the top. It is also a conventional temporary storage and transfer device in the factory, which is well known to those skilled in the art. Therefore, it will not be described in detail in this application.

[0058] In addition, the second cold-loading mechanism includes a belt conveyor, the two ends of which extend to the discharge port of the second material matching unit and the feed port of the electric furnace smelting unit, respectively.

[0059] Regarding the selection of electric furnace, the electric furnace smelting unit 5 described in this scheme can be an electric arc furnace or a submerged arc furnace.

[0060] In terms of post-processing of the product, as a possible implementation, the post-processing unit 7 of this solution further includes a cooling device and a crushing device. The inlet of the cooling device is connected to the outlet of the electric furnace smelting unit, and the outlet of the cooling device is connected to the inlet of the crushing device. After cooling and crushing, the resulting product can be directly sent to the warehouse 9 for storage. The slag water crushing unit of this solution includes a water crushing device, and the inlet of the water crushing device is connected to the slag outlet of the electric furnace smelting unit.

[0061] In terms of flue gas treatment, as a possible implementation method, the flue gas treatment unit 6 of this solution further includes a gravity dust collector 61, a cyclone dust collector 62, a bag dust collector 63, a desulfurization device 64, and a denitrification device 65 connected in sequence. The discharge ports at the lower parts of the gravity dust collector 61 and the cyclone dust collector 62 are respectively connected to the first material distribution unit 2, so that the dust settled by gravity in the gravity dust collector 61 and the dust settled in the cyclone dust collector 62 are transported back to the first material distribution unit 2.

[0062] Based on the above, the present invention also provides a method for resource utilization of electroplating sludge waste, which includes the following steps:

[0063] (1) Dry the electroplating sludge containing nickel and copper to make its moisture content between 20% and 30%;

[0064] (2) The dried electroplating sludge is mixed with coal powder and lime powder in a ratio of 80-90:6-12:4-8 and granulated into balls.

[0065] (3) The mixture formed into spherical shapes is subjected to oxidative roasting treatment;

[0066] (4) Sulfides are added to the mixture after oxidative roasting to make its sulfur content 20% to 25%, and then smelting is carried out to obtain low nickel matte copper products. At the same time, filter residue by-products and zinc-containing flue gas are also obtained.

[0067] In this scheme, the flue gas generated by oxidation roasting in step (3) and the flue gas generated by smelting in step (4) are discharged after being treated with dust removal, desulfurization and denitrification in sequence, and then meet the emission standards.

[0068] In addition, the oxidation roasting temperature in step (3) of this scheme is 800-1200℃, preferably 1050℃, and the melting temperature in step (4) is 800-1300℃, and the melting cycle is 2.5-6h / furnace.

[0069] To intuitively illustrate the working process of this system, this implementation uses the following examples and combinations. Figure 1 The workflow of this solution system and one of the feasible processes are described below:

[0070] Implementation Examples

[0071] I. Selection and Parameters of Some Equipment

[0072] This implementation example relies on the aforementioned system, in which most of the unit devices are reused from traditional equipment, and will not be described in detail here. The selection or parameters of some important unit devices are as follows:

[0073] 1. In this implementation example, the first calcination unit 1 is 50m². 2 Box-type custom-made oxidation roasting machine;

[0074] 2. Electric furnace smelting unit 5 is a 5000KVA capacity nickel-copper sulfidation smelting electric furnace, which can also reuse the ferroalloy submerged arc furnace. Some parameters are adjusted, and the specific parameters after adjustment are shown in Table 1 below.

[0075] Table 1. Main Parameters of 5000KVA Vulcanizing Electric Furnace

[0076]

[0077] In this example, regarding the selection of the electric furnace, the electric furnace smelting unit 5 can be an electric arc furnace or a submerged arc furnace. Because the material composition of electroplating sludge differs from that of conventional nickel-copper ore, the inventors found in practice that their metallurgical properties differ significantly, making it difficult to directly reference relevant process details and parameters from the processing of traditional nickel-copper ore. This example, through practical demonstration, shows that, under the same capacity and specifications, the electroplating sludge in this example melts faster and has a shorter sulfidation reaction time compared to nickel-copper ore during the smelting process. Therefore, after reference... Through optimization and debugging, the secondary voltage of the electroplating furnace melting unit 5 in this application is 2 to 2.5 times that of a conventional submerged arc furnace of the same capacity during use. In addition, the area power density of the reduction reaction zone in the furnace of this electric furnace melting equipment is adjusted to 0.65 to 0.8 times that of a conventional submerged arc furnace of the same capacity. Under these parameters, the process is stable and reliable. At the same time, based on these debugging parameters, traditional conventional circuit equipment can be modified to achieve normal process operation, obtain lower power consumption and higher metal element recovery rate, and achieve the goal of low-cost resource utilization of electroplating sludge waste.

[0078] Structurally, the furnace bottom and walls are bonded with magnesium chromium powder refractory material, avoiding the use of carbon refractory materials and refractory bricks to build the furnace body; in terms of power supply, the electric furnace smelting equipment in this embodiment can be an AC electric furnace or a DC electric furnace.

[0079] 3. In this embodiment, the baghouse dust collector used in the flue gas treatment unit has a structure roughly the same as that of a traditional baghouse dust collector, but the filter layer area of ​​its filter bags is changed to 1.5 to 2.0 times that of the filter bags in a traditional belt dust collector. For example, instead of the traditional 3000m² filter bag area... 2 Transformed to 5500m 2 The air velocity after passing through the bag filter is adjusted to 0.25-0.3 m / s, which is conducive to the enrichment of zinc oxide products and the improvement of grade.

[0080] Except for some adjustments mentioned above, the equipment in this implementation system is equipped with conventional metallurgical equipment.

[0081] II. Technological Methods and Implementation Steps

[0082] 1. The quantity and chemical composition of the nickel- and copper-containing electroplating sludge used in this embodiment are shown in Table 2 below:

[0083] Table 2. Main chemical components and weights of electroplating sludge used in the implementation.

[0084]

[0085] III. Specific Implementation Process Steps

[0086] 1. Mix the sludge from Table 2 according to the proportion and send it to sludge drying unit 1 for drying treatment. The sludge moisture content is dried to 28%.

[0087] 2. The dried sludge is mixed in the first material mixing unit 2 according to the ratio of sludge: coal powder: lime powder = 86:10:4. At the same time, it is made into spheres with a particle size of about 10-30mm by a disc pelletizer. The coal powder has a calorific value of 5800 kcal and the lime powder contains ≥80% CaO.

[0088] 3. The sludge pellets prepared in the first material blending unit 2 are sent to the first roasting unit 3 for high-temperature oxidation roasting at a temperature of 1050℃. After roasting, the main chemical components of the pellets are tested, and the results and quantities are shown in Table 3 below:

[0089] Table 3 Chemical composition and weight of sludge roasting blocks

[0090]

[0091] 4. The materials shown in Table 3 are blended in the second material blending unit 4 and then sent to the electric furnace smelting unit 5. The blending ratio is: roasted block (made in the first roasting unit 3): pyrite: gypsum = 85:10:5. The main chemical components of pyrite and gypsum are shown in the table below:

[0092] Table 4 Chemical Composition of Auxiliary Raw Materials

[0093]

[0094] 5. After the mixture is prepared by the second material mixing unit 4, it is sent to the electric furnace melting unit 5 for sulfidation melting. The temperature is gradually increased from 800℃ to 1200℃, and the melting time is 4 hours / furnace.

[0095] 6. After the electric furnace smelting unit 5 is completed, the molten nickel matte and copper matte are separated from the product outlet to obtain the nickel matte copper product, and the slag is discharged from the slag outlet.

[0096] 7. The separated nickel-copper alloy is cast into molds through the post-processing unit 7, cooled, crushed, and then sold.

[0097] 8. The flue gas generated by the electric furnace smelting unit 5 and the first roasting unit 3 is treated by the gravity dust collector 61, cyclone dust collector 62 and bag dust collector 63 of the flue gas treatment unit 6 to recover secondary zinc oxide products. The filtered flue gas is then purified by the desulfurization device 64 and the denitrification device 65 before being discharged in compliance with standards. Among them, the gypsum solid waste after desulfurization is reused as an auxiliary raw material, and the slag generated by the electric furnace smelting is sold for use as building materials.

[0098] The chemical composition analysis of the products and by-products produced in this implementation example is shown in Table 5 below:

[0099] Table 5 Chemical Composition of Products and By-products

[0100]

[0101] Effect comparison

[0102] This experiment processed 1000 tons of dry nickel-copper electroplating sludge, producing 50 batches of products, including 125 tons of low-grade nickel-copper matte, 85.43 tons of zinc oxide, 750 tons of slag, and 50 tons of gypsum. The recovery rates of heavy metals from the products are shown in Table 6 below.

[0103] Table 6. Recovery Rate of Heavy Metal Elements in Sludge

[0104] Recovery rate % 96.23 94.9 97.56

[0105] The above description is only a part of the embodiments of the present invention and does not limit the scope of protection of the present invention. Any equivalent device or equivalent process transformation made based on the content of the present invention specification and drawings, or direct or indirect application in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for the resource utilization of electroplating sludge waste, characterized in that, Includes the following steps: (1) Drying treatment is carried out on electroplating sludge containing nickel, copper, chromium, zinc and iron to make its moisture content between 20% and 30%; (2) The dried electroplating sludge is mixed with coal powder and lime powder in a ratio of 80-90:6-12:4-8 and granulated into balls; (3) The mixture that has been made into spherical shape is subjected to oxidative roasting treatment, wherein the oxidative roasting temperature is 800-1200 ℃; (4) Sulfides are added to the mixture after oxidative roasting so that the sulfur content is 20% to 25% of the nickel, copper and iron metal sulfide products. Then, sulfidation smelting is carried out to obtain low-grade nickel matte copper products. At the same time, filter residue by-products are also obtained, and zinc-containing flue gas is generated. The smelting temperature is 800 to 1300 ℃, and the smelting cycle is 2.5 to 6 h / furnace. Among them, the flue gas generated by oxidation roasting in step (3) and the flue gas generated by smelting in step (4) are discharged after being treated by dust removal, desulfurization and denitrification in sequence, and then meet the standards. During flue gas dust removal, the air velocity after passing through the bag filter is 0.25 to 0.3 m / s.

2. A system for the resource utilization of electroplating sludge waste, used to implement the method for the resource utilization of electroplating sludge waste as described in claim 1, characterized in that, It includes: The sludge drying unit is used to dry electroplating sludge. The first material blending unit has an inlet and an outlet. The inlet of the first material blending unit is used to input electroplating sludge that has been dried by the sludge drying unit and other preset formula materials. The first roasting unit has a feed inlet, a discharge outlet and a flue gas outlet. The feed inlet of the first roasting unit is connected to the discharge outlet of the first material blending unit and is used to receive the material blended and output by the first material blending unit. The second material blending unit has an inlet and an outlet. The inlet of the second material blending unit is used to input the material after roasting by the first roasting unit and other preset formula materials. The flue gas treatment unit has its input end connected to the flue gas outlet of the first calcination unit; An electric furnace smelting unit has its input end connected to the outlet of a second material mixing unit and is used to smelt the input material. The electric furnace smelting unit also has a product outlet, a slag outlet and a gas outlet. The gas outlet of the electric furnace smelting unit is connected to the input end of a flue gas treatment unit. The product post-processing unit has its input end connected to the discharge port of the electric furnace smelting unit and is used to cool and crush the material output from the product discharge port of the electric furnace smelting unit. The slag water crushing unit has its input end connected to the slag outlet of the electric furnace smelting unit and is used to perform water crushing treatment on the slag output from the slag outlet of the electric furnace smelting unit.

3. The electroplating sludge waste resource utilization system as described in claim 2, characterized in that, The discharge port of the sludge drying unit is connected to the inlet of the first material blending unit via a belt conveyor. The discharge port of the first material blending unit is connected to the feed port of the first roasting unit via a belt conveyor. The flue gas outlet of the first roasting unit and the gas outlet of the electric furnace smelting unit are both connected to the input end of the flue gas treatment unit via steel pipes.

4. The electroplating sludge waste resource utilization system as described in claim 2, characterized in that, The electric furnace smelting unit is an electric arc furnace or a submerged arc furnace.

5. The electroplating sludge waste resource utilization system as described in claim 2, characterized in that, A first hot-loading mechanism or a first cold-loading mechanism for assisting material transfer is provided between the first roasting unit and the second material mixing unit. The first hot charging mechanism includes a gantry crane and a heat-insulating tank connected to the hook of the gantry crane. The heat-insulating tank is used to temporarily store the material output from the outlet of the first roasting unit. The gantry crane is used to lift the heat-insulating tank and drive the heat-insulating tank to be transferred between the outlet of the first roasting unit and the inlet of the second material mixing unit. The first cold-loading mechanism includes a chain conveyor or a belt conveyor, with both ends of the chain conveyor or the belt conveyor extending to the discharge port of the first roasting unit and the inlet of the second material mixing unit, respectively.

6. The electroplating sludge waste resource utilization system as described in claim 2, characterized in that, A second hot charging mechanism or a second cold charging mechanism for auxiliary material transfer is provided between the second material batching unit and the electric furnace smelting unit. The second hot charging mechanism includes an insulated barrel and a trolley. The insulated barrel is used to contain the material output from the outlet of the second material mixing unit. The trolley has a transfer and placement platform for placing the insulated barrel. The trolley drives the insulated barrel to move between the outlet of the second material mixing unit and the inlet of the electric furnace smelting unit. In addition, the second cold-loading mechanism includes a belt conveyor, the two ends of which extend to the discharge port of the second material matching unit and the feed port of the electric furnace smelting unit, respectively.

7. The electroplating sludge waste resource utilization system as described in claim 2, characterized in that, The post-processing unit includes a cooling device and a crushing device. The inlet of the cooling device is connected to the outlet of the electric furnace smelting unit, and the outlet of the cooling device is connected to the inlet of the crushing device. The slag water crushing unit includes a water crushing device, and the inlet of the water crushing device is connected to the slag outlet of the electric furnace smelting unit.

8. The electroplating sludge waste resource utilization system as described in claim 2, characterized in that, The flue gas treatment unit includes a gravity dust collector, a cyclone dust collector, a bag filter dust collector, a desulfurization device, and a denitrification device connected in sequence. The discharge ports at the bottom of the gravity dust collector and the cyclone dust collector are respectively connected to the first material distribution unit, so that the dust settled by gravity in the gravity dust collector and the dust settled in the cyclone dust collector are transported back to the first material distribution unit.

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