High-copper and high-lead zinc concentrate treatment system

Abstract

The utility model discloses a high-copper and high-lead zinc concentrate treatment system which comprises a granulator, a discharge port of the granulator is communicated with a feed port of a fluidized bed roaster, a discharge port of the fluidized bed roaster is communicated with a feed port of an oxygen-enriched side-blown reduction furnace, an exhaust port of the oxygen-enriched side-blown reduction furnace is communicated with an air inlet of a condenser, and an air outlet of the condenser is communicated with an air outlet of the fluidized bed roaster. A discharge port of the oxygen-enriched side-blown reduction furnace is communicated with a feed port of the fuming furnace, and a discharge port of the fuming furnace is communicated with a feed port of the electric furnace. According to the utility model, the problem that high-impurity-element zinc concentrate is difficult to treat in the traditional wet process flow is solved, the sintering procedure and the existing problems in the blast furnace zinc smelting are eliminated, and the comprehensive recycling of lead, zinc and copper is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of zinc concentrate smelting, in particular to a zinc concentrate treatment system containing high copper and high lead. Background Art

[0002] Modern zinc smelting methods are divided into two categories: pyrometallurgical zinc smelting and hydrometallurgical zinc smelting, with hydrometallurgical zinc smelting being the main method. The traditional hydrometallurgical zinc smelting process is divided into five stages: sulfation roasting, leaching, purification, electrolytic deposition, and casting. This process route has relatively high requirements for the zinc content and impurity elements in zinc concentrate, with a long and complex process flow. Moreover, zinc leaching residues are classified as hazardous wastes and still require pyrometallurgical smelting for harmless treatment.

[0003] Currently, the traditional pyrometallurgical zinc smelting processes include electric furnace zinc smelting, shaft furnace zinc smelting, and closed blast furnace zinc smelting. Due to process limitations, the production capacity of electric furnace zinc smelting and shaft furnace zinc smelting can no longer meet the needs of modern industry. In the closed blast furnace zinc smelting process, there are problems in the sintering process, such as complex batching, harsh working conditions, and large energy losses. Only a few smelters in China still retain the closed blast furnace zinc smelting process.

[0004] Facing the increasingly depleted high-quality zinc concentrate resources, the importance of how to process high-copper and high-lead zinc concentrates with relatively high impurity elements has become increasingly prominent. However, there is currently no suitable process to treat zinc concentrates containing high copper and high lead to achieve the comprehensive recovery and utilization of copper, lead, and zinc.

[0005] The Chinese patent application with the publication number CN113736994A discloses a roasting treatment method for zinc concentrates with high lead, high copper, and high iron, which includes the following steps: Step S1, mixing the zinc concentrates with high lead, high copper, and high iron with a binder and granulating, and then drying to obtain zinc concentrate pellets; Step S2, adding the zinc concentrate pellets into a fluidized bed roaster or a fluidized bed for oxidative roasting treatment to obtain roasted products; Step S3, feeding the roasted products into a hydrogen reduction furnace for selective reduction to reduce zinc ferrite therein to ZnO and Fe3O4 to obtain reduced products. The production system of this patent includes a granulator, a roaster, a hydrogen reduction furnace, a hydrometallurgical leaching device, and an electrolysis device connected in sequence. The ZnO reduced product obtained from the hydrogen reduction furnace of this patent still needs to be wet-leached again through a hydrometallurgical leaching device and electrolyzed using an electrolysis device to extract metallic zinc. The system is complex and does not consider the recovery of copper and lead metals. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a zinc concentrate treatment system to achieve the comprehensive recovery and utilization of lead, zinc, and copper in view of the deficiencies of the prior art.

[0007] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: A zinc concentrate treatment system containing high copper and high lead includes a granulator. The discharge port of the granulator is communicated with the feed port of a fluidized bed roaster. The discharge port of the fluidized bed roaster is communicated with the feed port of an oxygen-enriched side-blown reduction furnace. The exhaust port of the oxygen-enriched side-blown reduction furnace is communicated with the intake port of a condenser.

[0008] The discharge port of the oxygen-enriched side-blown reduction furnace is communicated with the feed port of a fuming furnace.

[0009] Flux and reducing coal are added to the roasting product of the fluidized bed roaster and sent to the oxygen-enriched side-blown reduction furnace for reduction smelting to obtain zinc vapor, crude lead, and copper-zinc-containing slag. The zinc vapor is collected by the condenser to obtain crude zinc and low-calorific-value gas, realizing the efficient recovery and utilization of zinc.

[0010] The copper-zinc-containing slag obtained in the oxygen-enriched side-blown reduction furnace is sent to the fuming furnace for smelting to obtain secondary zinc oxide dust and copper-containing slag.

[0011] The zinc concentrate containing high copper and high lead includes the following chemical components by mass percentage: copper content ≥ 1.5%, lead content ≥ 2.5%, and zinc content ≥ 30%.

[0012] In a preferred embodiment of the present utility model, the discharge port of the fuming furnace is communicated with the feed port of an electric furnace.

[0013] The copper-containing slag in the fuming furnace is sent to the electric furnace for heat preservation, clarification, and separation to obtain matte and slag.

[0014] In a preferred embodiment of the present utility model, the exhaust port of the fuming furnace is communicated with the intake port of a first waste heat boiler. The exhaust port of the first waste heat boiler is communicated with the intake port of a first dust collection device.

[0015] In a preferred embodiment of the present utility model, the exhaust port of the fluidized bed roaster is communicated with the intake port of a second waste heat boiler. The exhaust port of the second waste heat boiler is communicated with the intake port of a second dust collection device.

[0016] In a preferred embodiment of the present utility model, the condenser is a lead rain condenser or a zinc rain condenser.

[0017] In a preferred embodiment of the present utility model, the granulator is a disk granulator, a cylindrical granulator, or a rotary kiln.

[0018] In a preferred embodiment of the present utility model, the discharge port of the second waste heat boiler and the discharge port of the second dust collection device are both communicated with the feed port of the oxygen-enriched side-blown reduction furnace or the granulator.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model provides a zinc concentrate treatment system containing high copper and high lead, which realizes the efficient recovery and utilization of zinc. At the same time, the present utility model can also realize the comprehensive recovery and utilization of lead and copper metals.

[0020] The present utility model solves the problem that traditional wet processes are difficult to treat zinc concentrates with high impurity elements, and eliminates the sintering process and existing problems in zinc smelting in blast furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.

[0022] Among them, 1 - granulator, 2 - fluidized bed roasting furnace, 3 - oxygen-enriched side-blown reduction furnace, 4 - condenser, 5 - fuming furnace, 6 - electric furnace, 7 - first waste heat boiler, 8 - first dust collection device, 9 - second waste heat boiler, 10 - second dust collection device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] As Figure 1 shown, an embodiment of the present utility model includes a granulator 1, and the discharge port of the granulator 1 is communicated with the feed port of the fluidized bed roasting furnace 2. The granulator 1 is a disk granulator or a cylindrical granulator or a rotary kiln. The discharge port of the fluidized bed roasting furnace 2 is communicated with the feed port of the oxygen-enriched side-blown reduction furnace 3, and the exhaust port of the oxygen-enriched side-blown reduction furnace 3 is communicated with the intake port of the condenser 4. The condenser 4 is a lead rain condenser or a zinc rain condenser. The discharge port of the oxygen-enriched side-blown reduction furnace 3 is communicated with the feed port of the fuming furnace 5. The discharge port of the fuming furnace 5 is communicated with the feed port of the electric furnace 6. The exhaust port of the fuming furnace 5 is communicated with the intake port of the first waste heat boiler 7, and the exhaust port of the first waste heat boiler 7 is communicated with the intake port of the first dust collection device 8. The exhaust port of the fluidized bed roasting furnace 2 is communicated with the intake port of the second waste heat boiler 9, and the exhaust port of the second waste heat boiler 9 is communicated with the intake port of the second dust collection device 10. The discharge port of the second waste heat boiler 9 and the discharge port of the second dust collection device 10 are both communicated with the feed port of the oxygen-enriched side-blown reduction furnace 3 or the granulator 1.

[0024] The usage method of the present utility model includes the following steps:

[0025] 1) First, mix the zinc concentrate containing high copper and high lead with a binder evenly in a granulator and granulate to obtain qualified granular ore;

[0026] 2) Send the granular ore obtained in step 1) to a fluidized bed roasting furnace for oxidative roasting and desulfurization to obtain a roasted product;

[0027] 3) Add a flux and reducing coal to the roasted product obtained in step 2), and send it to an oxygen-enriched side-blown reduction furnace for reduction smelting to obtain zinc vapor, crude lead, and copper-zinc slag-containing;

[0028] 4) The zinc vapor obtained in step 3) is collected through a condenser to obtain crude zinc and low calorific value gas.

[0029] 5) The copper-zinc slag obtained in step 3) is sent to a fuming furnace for smelting to obtain secondary zinc oxide dust and copper-containing slag.

[0030] 6) The copper-containing slag obtained in step 5) is sent to an electric furnace for heat preservation, clarification and separation to obtain matte and slag.

Claims

1. A system for processing zinc concentrate containing high copper and high lead, comprising a granulator (1), wherein the discharge port of the granulator (1) is connected to the feed port of a fluidized bed roasting furnace (2), characterized in that: The discharge port of the fluidized bed roasting furnace (2) is connected to the feed port of the oxygen-enriched side-blowing reduction furnace (3), and the exhaust port of the oxygen-enriched side-blowing reduction furnace (3) is connected to the air inlet of the condenser (4); The discharge port of the oxygen-enriched side-blowing reduction furnace (3) is connected to the feed port of the fuming furnace (5).

2. The high-copper and high-lead zinc concentrate processing system according to claim 1, characterized in that: The discharge port of the fuming furnace (5) is in communication with the feed port of the electric furnace (6).

3. The high-copper and high-lead zinc concentrate processing system according to claim 1, characterized in that: The exhaust port of the fumigation furnace (5) is in communication with the air inlet of the first waste heat boiler (7), and the exhaust port of the first waste heat boiler (7) is in communication with the air inlet of the first dust collecting device (8).

4. The high-copper and high-lead zinc concentrate processing system according to claim 1, characterized in that: The exhaust port of the fluidized bed roasting furnace (2) is in communication with the air inlet of the second waste heat boiler (9), and the exhaust port of the second waste heat boiler (9) is in communication with the air inlet of the second dust collecting device (10).

5. The high-copper and high-lead zinc concentrate processing system according to any one of claims 1 to 4, characterized in that: The condenser (4) is a lead rain condenser or a zinc rain condenser.

6. The high-copper and high-lead zinc concentrate processing system according to any one of claims 1 to 4, characterized in that: The granulator (1) is a disc granulator, a drum granulator or a rotary kiln.

7. The high-copper and high-lead zinc concentrate processing system according to claim 4, characterized in that: The discharge port of the second waste heat boiler (9) and the discharge port of the second dust collecting device (10) are both connected to the feed port of the oxygen-enriched side-blowing reduction furnace (3) or the granulator (1).

Images