Copper-arsenic separation system

Abstract

The utility model discloses a copper and arsenic separation system which comprises an arsenic-rich liquid tank, a secondary vulcanization reactor, a copper and arsenic co-precipitation thickener, a filter press I, a filter press II, a slurrying tank and a rinsing tank, the side surface of the secondary vulcanization reactor is connected with the side surface above the copper-arsenic co-precipitation thickener through a pipeline, the bottom of the copper-arsenic co-precipitation thickener is connected with a filter press I through a copper-arsenic filter pressing pump, the filter press I is connected with a slurrying tank, the slurrying tank is connected with a filter press II through a slurrying tank pump, and the filter press II is connected with a rinsing tank. According to the utility model, the recovery rate of copper is improved, the consumption of hydrogen sulfide is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of copper smelting, and specifically relates to a copper-arsenic separation system. Background Art

[0002] At present, during the production process of domestic copper smelting enterprises, affected by smelting raw materials and production processes, the characteristics of the copper electrolysis waste liquid produced in the electrolysis process of the copper smelting process are high acidity, complex composition, containing heavy metal impurities such as copper, lead, cadmium, and zinc, as well as harmful substances such as high-concentration fluorine, chlorine, and arsenic. Direct discharge without treatment will cause great harm to the environment. The previous treatment steps for this copper electrolysis waste liquid were mainly divided into three steps. The first step was to remove most of the copper in the copper electrolysis waste liquid, the second step was copper-arsenic coprecipitation, and the third step was arsenic removal. However, when using the traditional process to treat copper electrolysis waste liquid in the past, because the specific values of Cu and As in the copper electrolysis waste liquid could not be monitored in real time during each step, in order to ensure the qualified rate of the indexes of the treated liquid of the copper electrolysis waste liquid, an excessive amount of hydrogen sulfide gas was often added in the first step to ensure that the heavy metal ions in the waste liquid fully reacted with hydrogen sulfide and precipitated. The disadvantage of doing this was that it would cause waste of hydrogen sulfide gas, increase the treatment cost of copper electrolysis waste liquid, and make the arsenic content in the filtered copper slag too high, which was not conducive to recycling, and the overall production cost increased. Content of the Utility Model

[0003] Based on this, the purpose of the utility model is to provide a copper-arsenic separation system to solve the technical problems raised in the above background.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: A copper-arsenic separation system includes an arsenic-rich liquid tank, a secondary sulfidation reactor, a copper-arsenic coprecipitation thickener, a first filter press, a second filter press, a pulping tank, and a washing tank. The arsenic-rich liquid tank is connected to the secondary sulfidation reactor through an arsenic-rich liquid pump. The side of the secondary sulfidation reactor is connected to the upper side of the copper-arsenic coprecipitation thickener through a pipeline. The bottom of the copper-arsenic coprecipitation thickener is connected to the first filter press through a copper-arsenic filter pump. The first filter press is connected to the pulping tank. The pulping tank is connected to the second filter press through a pulping tank pump. The second filter press is connected to the washing tank.

[0005] Further, the bottom of the secondary sulfidation reactor is connected to the water inlet end of a sulfidation drainage pump through a pipeline. The water outlet end of the sulfidation drainage pump is connected to the upper side of the secondary sulfidation reactor through a pipeline.

[0006] Further, the arsenic-rich liquid tank is connected to a copper precipitation thickener. The pipelines connecting the arsenic-rich liquid pump and the sulfidation drainage pump to the secondary sulfidation reactor are also connected to a hydrogen sulfide preparation system through pipelines.

[0007] Further, the top of the pulping tank is also connected to a waste copper liquid storage tank through a pipeline.

[0008] Further, both the first filter press and the second filter press are connected to the copper precipitation thickener.

[0009] Further, the water washing tank is connected to the copper precipitation thickener through a water washing tank pump.

[0010] In the second-stage copper-arsenic coprecipitation stage of the sulfidation treatment of waste copper solution, the present utility model adds a pulping and replacement step. By adding the original waste copper solution to the pulping tank and under the condition of a pulping temperature of 80°C - 85°C, the Cu ions in the original waste copper solution are used to react with the As ions in the arsenic sulfide slag to replace the arsenic sulfide slag with copper sulfide slag, improving the copper recovery rate, reducing the consumption of hydrogen sulfide, and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the system of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0013] Next, the embodiments of the present utility model will be described according to the overall structure of the present utility model.

[0014] As Figure 1 shown, the present utility model includes an arsenic-rich liquid tank 1, a second-stage sulfidation reactor 4, a copper-arsenic coprecipitation thickener 5, a first filter press 7, a second filter press 12, a pulping tank 8, and a water washing tank 10. The arsenic-rich liquid tank 1 is connected to the second-stage sulfidation reactor 4 through an arsenic-rich liquid pump 2. The side of the second-stage sulfidation reactor 4 is connected to the upper side of the copper-arsenic coprecipitation thickener 5 through a pipeline. The bottom of the copper-arsenic coprecipitation thickener 5 is connected to the first filter press 7 through a copper-arsenic filter press pump 3. The first filter press 7 is connected to the pulping tank 8. The pulping tank 8 is connected to the second filter press 12 through a pulping tank pump 9. The second filter press 12 is connected to the water washing tank 10. The bottom of the second-stage sulfidation reactor 4 is connected to the water inlet end of the sulfidation drainage pump 3 through a pipeline. The water outlet end of the sulfidation drainage pump 3 is connected to the upper side of the second-stage sulfidation reactor 4 through a pipeline. The arsenic-rich liquid tank 1 is connected to the copper precipitation thickener 13. The pipelines connecting the arsenic-rich liquid pump 2 and the sulfidation drainage pump 3 to the second-stage sulfidation reactor 4 are also connected to a hydrogen sulfide preparation system 14 through pipelines. The top of the pulping tank 8 is also connected to a waste copper solution storage tank 15 through a pipeline. The copper slag pressed out by the first filter press and the second filter press returns to the copper precipitation thickener 13. The water washing tank 10 is connected to the copper precipitation thickener 13 through a water washing tank pump 11.

[0015] The working principle of the present utility model:

[0016] The supernatant of the copper precipitation thickener 13 enters the arsenic-rich liquid tank 1. The arsenic-rich liquid pump 2 pumps the arsenic-rich liquid into the secondary sulfidation reactor 4. At this time, a small amount of hydrogen sulfide is added to the secondary sulfidation reactor 4 through the hydrogen sulfide preparation system 14 to ensure that while the hydrogen sulfide gas can react to precipitate less Cu ions in the arsenic-rich liquid, too much As2S3 will not be produced, so as to ensure the stability of the subsequent copper-arsenic replacement effect. After passing through the secondary sulfidation reactor 4, the arsenic-rich liquid enters the copper-arsenic coprecipitation thickener 5 for sedimentation and then enters the first filter press 7 through the thickener low-flow pump. At this time, the copper slag produced contains too much As. After unloading the copper slag produced by the first filter press 7 into the slurry tank 8 and adding it to the copper electrolysis waste liquid through the waste copper liquid storage tank 15, it is slurried and replaced for 2 hours under the condition that the slurry is at 80-85 °C. After the slurry is finished, the slurried liquid is pumped into the second filter press 12 for secondary pressing. The produced copper slag is washed through the water washing tank 10 and then pumped back to the copper precipitation thickener 13 through the water washing tank pump 11. At this time, the As content in the produced copper slag is reduced to the lowest, which is convenient for recycling.

[0017] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and not limitations thereto. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations that do not make creative contributions to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A copper-arsenic separation system, characterized in that, It includes an arsenic-rich liquid tank, a secondary sulfidation reactor, a copper-arsenic coprecipitation thickener, a first filter press, a second filter press, a pulping tank and a water washing tank. The arsenic-rich liquid tank is connected to the secondary sulfidation reactor through an arsenic-rich liquid pump. The side of the secondary sulfidation reactor is connected to the upper side of the copper-arsenic coprecipitation thickener through a pipeline. The bottom of the copper-arsenic coprecipitation thickener is connected to the first filter press through a copper-arsenic filter pump. The first filter press is connected to the pulping tank. The pulping tank is connected to the second filter press through a pulping tank pump. The second filter press is connected to the water washing tank.

2. The copper-arsenic separation system according to claim 1, characterized in that: The bottom of the secondary sulfidation reactor is connected to the water inlet end of a sulfidation drainage pump through a pipeline. The water outlet end of the sulfidation drainage pump is connected to the upper side of the secondary sulfidation reactor through a pipeline.

3. The copper-arsenic separation system according to claim 2, characterized in that: The arsenic-rich liquid tank is connected to a copper precipitation thickener. The pipelines connecting the arsenic-rich liquid pump and the sulfidation drainage pump to the secondary sulfidation reactor are also connected to a hydrogen sulfide preparation system through pipelines.

4. A copper-arsenic separation system according to claim 1, characterized in that: The top of the pulping tank is also connected to a waste copper liquid storage tank through a pipeline.

5. The copper-arsenic separation system according to claim 1, characterized in that: Both the first filter press and the second filter press are connected to the copper precipitation thickener.

6. The copper-arsenic separation system according to claim 1, wherein: The water washing tank is connected to the copper precipitation thickener through a water washing tank pump.

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