Vacuum evaporation tank

Abstract

The utility model discloses a vacuum evaporation tank which comprises a vacuum evaporation tank and a liquid supplementing mechanism, the liquid supplementing mechanism comprises a liquid supplementing tank and a pre-evaporation liquid tank, the liquid supplementing tank is connected with the top of the vacuum evaporation tank through a pipeline, and the pre-evaporation liquid tank is connected with the top of the liquid supplementing tank through a pipeline. The utility model eliminates the potential safety hazard that gas and liquid do not emerge from an observation port at the top of the evaporation kettle due to positive pressure in the evaporation tank during liquid supplementation, reduces the scaling, corrosion and perforation conditions of plate sheets of the plate heat exchanger, simultaneously reduces the cleaning work of dismounting and mounting the plate heat exchanger, reduces the labor capacity, and improves the working efficiency. The direct recovery rate of nickel sulfate is increased, the nickel content of acid wastewater is reduced, the steam utilization rate is increased, the evaporation efficiency is improved, and production is balanced and stable.

Description

Technical Field

[0001] The utility model relates to the technical field of purifying and removing nickel in copper electrolyte, in particular to a vacuum evaporation tank. Background Art

[0002] At present, the main method for purifying and removing nickel from copper electrolyte is to produce crude nickel sulfate by vacuum evaporation and cooling crystallization. This technology has the advantages of mature technology, stable impurity removal effect, and simple operation. However, it needs to intermittently replenish the solution during the vacuum evaporation and concentration process. During this period, the vacuum tank is under negative pressure, and the replenished solution will impact the liquid surface and cause large fluctuations, so that the water ring vacuum pump extracts part of the solution in the vacuum evaporation tank, passes through the plate heat exchanger, and obtains acidic hot water after cooling. The acidic hot water returns to the electrolysis system. The impurity removal of this process is not thorough, and the obtained acidic water still contains nickel, and the service life of the plate heat exchanger is shortened, which increases the equipment cost. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide a vacuum evaporation tank to solve the technical problems raised in the above background.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a vacuum evaporation tank, comprising a vacuum evaporation tank and a liquid replenishing mechanism, wherein the liquid replenishing mechanism comprises a liquid replenishing tank and a pre-evaporation liquid tank, wherein the liquid replenishing tank is connected to the top of the vacuum evaporation tank through a pipeline, and the pre-evaporation liquid tank is connected to the top of the liquid replenishing tank through a pipeline.

[0005] Furthermore, a valve is provided on the pipeline connecting the liquid replenishing tank and the vacuum evaporation tank, and a centrifugal pump is provided on the pipeline connecting the pre-evaporation liquid tank and the liquid replenishing tank.

[0006] Furthermore, the liquid replenishing tank and the vacuum evaporation tank are installed on the same horizontal plane, and the top of the pre-evaporation liquid tank is lower than the bottom of the liquid replenishing tank.

[0007] The utility model eliminates the potential safety hazard that the evaporator tank becomes positively pressurized during liquid replenishment, so that gas and liquid will not emerge from the observation port on the top of the evaporator tank, etc., reduces the scaling, corrosion and perforation of the plate heat exchanger, and reduces the cleaning work of disassembling and assembling the plate heat exchanger, thereby reducing the labor; improves the direct recovery rate of nickel sulfate, reduces the nickel content of acidic wastewater (originally Ni: 1g / L, now Ni0.3g / l); improves the steam utilization rate, and improves the evaporation efficiency (originally 0.75m 3 / h, now 1.25m 3 / h) and make the production balanced and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0010] The following describes an embodiment of the utility model based on its overall structure.

[0011] like Figure 1 As shown, the utility model includes a vacuum evaporation tank 1 and a liquid replenishing mechanism, the liquid replenishing mechanism includes a liquid replenishing tank 2 and a pre-evaporation liquid tank 3, the liquid replenishing tank 2 is connected to the top of the vacuum evaporation tank 1 through a pipeline 4, the pre-evaporation liquid tank 3 is connected to the top of the liquid replenishing tank 2 through a pipeline 4, a valve 5 is provided on the pipeline 4 connecting the liquid replenishing tank 2 and the vacuum evaporation tank 1, a centrifugal pump 6 is provided on the pipeline 4 connecting the pre-evaporation liquid tank 3 and the liquid replenishing tank 2, the top of the liquid replenishing tank 2 is open, the liquid replenishing tank 2 and the vacuum evaporation tank 1 are installed on the same horizontal plane, and the top of the pre-evaporation liquid tank 3 is lower than the bottom of the liquid replenishing tank 2.

[0012] In the process of purifying and removing nickel from copper electrolyte, the utility model comprises 50.25 g / l of copper, 170.31 g / l of sulfuric acid and 11.35 g / l of nickel. The copper electrolyte is subjected to first-stage copper removal, second-stage copper removal and cyclone electrowinning, and then desulfurized and impurized to obtain a sulfided liquid, which is used to produce nickel sulfate. The sulfided liquid is placed in a vacuum evaporator for vacuum evaporation, and a pipeline is added to the vacuum evaporator to be connected with a liquid replenishing mechanism. The negative pressure in the tank is used to make the sulfided liquid enter the vacuum evaporator to replenish the part of the solution evaporated during the vacuum evaporation process, and the liquid level of the vacuum evaporator is kept stable. After vacuum evaporation, the precooling tank (water cooling) - filter press - freezing night tank - freezing crystallization tank - centrifugation are passed through, and the product nickel sulfate (containing 18.01% nickel) is finally obtained. The centrifuged liquid and the nickel sulfate mother liquor are returned to the electrolysis system.

[0013] The utility model eliminates the potential safety hazard that the evaporator becomes positively pressurized during liquid replenishment, so that gas and liquid will not emerge from the observation port on the top of the vacuum evaporator, etc., reduces the scaling, corrosion and perforation of the plate heat exchanger, and reduces the cleaning work of disassembling and assembling the plate heat exchanger, thereby reducing the labor; improves the direct recovery rate of nickel sulfate, reduces the nickel content of acidic wastewater (originally Ni: 1g / L, now Ni0.3g / l); improves the steam utilization rate, and improves the evaporation efficiency (originally 0.75m 3 / h, now 1.25m 3 / h) and make the production balanced and stable.

[0014] Although an embodiment of the utility model has been shown and described, this specific embodiment is merely an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A vacuum evaporation tank, characterized in that: It comprises a vacuum evaporation tank and a liquid replenishing mechanism, wherein the liquid replenishing mechanism comprises a liquid replenishing tank and a pre-evaporation liquid tank, the liquid replenishing tank is connected to the top of the vacuum evaporation tank through a pipeline, and the pre-evaporation liquid tank is connected to the top of the liquid replenishing tank through a pipeline.

2. A vacuum evaporation tank according to claim 1, characterized in that: A valve is arranged on the pipeline connecting the liquid replenishing tank and the vacuum evaporation tank, and a centrifugal pump is arranged on the pipeline connecting the pre-evaporation liquid tank and the liquid replenishing tank.

3. A vacuum evaporation tank according to claim 1, characterized in that: The liquid replenishing tank and the vacuum evaporation tank are installed on the same horizontal plane, and the top of the pre-evaporation liquid tank is lower than the bottom of the liquid replenishing tank.

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