Nickel sulfate continuous crystallization system

Abstract

The utility model discloses a nickel sulfate continuous crystallization system which comprises a crystallizer, the crystallizer comprises an evaporation chamber and a crystallization chamber installed on the lower portion of the evaporation chamber, the bottom of the evaporation chamber is located in the crystallization chamber, and the bottom of the evaporation chamber is provided with a communicating pipe which enables the evaporation chamber to be communicated with the inside of the crystallization chamber. A feeding hole is formed in the bottom of the evaporation chamber, a first liquid outlet is formed in the upper part of the crystallization chamber, a second liquid outlet and a crystal outlet are formed in the lower part of the crystallization chamber, the crystal outlet is positioned on the crystallization chamber below the horizontal plane where the second liquid outlet is positioned, and a circulating pump is connected to the feeding hole through a pipeline; the circulating pump is further communicated with the first liquid outlet and the second liquid outlet through pipelines, and the pipeline between the first liquid outlet and the circulating pump is further connected with a feeding pipe. The forced circulation crystallization device overcomes the defects in the prior art, and can be used for carrying out forced circulation on the crystallization chamber through the circulating pump, so that the control on the size of crystallized particles is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporation crystallization devices, in particular to a nickel sulfate continuous crystallization system. Background Art

[0002] As an important chemical raw material, nickel sulfate is widely used in civil, construction, aerospace equipment, defense industry and other fields, mainly used in electroplating, chemical plating, aluminum coloring, battery materials and catalysts, etc. At present, the conventional crystallization of nickel sulfate hexahydrate adopts intermittent batch crystallization. Its equipment has large product particles and flexible use, but low production capacity, large land occupation, complex operation and low automation, which makes the product quality uncontrollable, resulting in unstable operation of subsequent drying equipment, large amount of re-dissolution, and further reduction of production efficiency.

[0003] At present, in order to solve the above problems, most continuous crystallizers adopt the form of internal circulation of crystal slurry, that is, a large amount of granular salt participates in the overall material circulation, which leads to serious wear of salt and no standard crystal shape. In addition, crystals of different particle sizes participate in the whole process of circulation and discharging without classification, which makes the product yield low and the actual effective production capacity low. Utility Model Content

[0004] The utility model aims to provide a nickel sulfate continuous crystallization system, which overcomes the shortcomings of the prior art.

[0005] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0006] A nickel sulfate continuous crystallization system comprises a crystallizer, wherein the crystallizer comprises an evaporation chamber and a crystallization chamber installed at the lower part of the evaporation chamber, the bottom of the evaporation chamber is located in the crystallization chamber, and a connecting pipe for connecting the evaporation chamber with the inside of the crystallization chamber is provided at the bottom of the evaporation chamber; a feed port is provided at the bottom of the evaporation chamber, a first liquid outlet is provided at the upper part of the crystallization chamber, a second liquid outlet and a crystal outlet are provided at the lower part of the crystallization chamber, the crystal outlet is located on the crystallization chamber below the horizontal plane where the second liquid outlet is located, a circulation pump is connected to the feed port through a pipeline, the circulation pump is also connected to the first liquid outlet and the second liquid outlet through a pipeline, and a feed pipe is also connected to the pipeline between the first liquid outlet and the circulation pump.

[0007] Furthermore, a feed regulating valve is installed on the feed pipe.

[0008] Furthermore, the crystal outlet is connected to a crystal discharging pump via a pipeline, and the crystal discharging pump is connected to a centrifuge via a pipeline.

[0009] Furthermore, a liquid level sensor and a pressure gauge are installed on the evaporation chamber.

[0010] Furthermore, the top of the evaporation chamber is connected to a condenser through a pipeline, and the condenser is connected to a condensate collecting tank and a vacuum pump.

[0011] Furthermore, the condenser is connected to the vacuum pump via a pipeline, and a vacuum regulating valve is installed on the pipeline between the condenser and the vacuum pump.

[0012] Compared with the prior art, the implementation effects of the present invention are as follows:

[0013] The nickel sulfate continuous crystallization system can perform continuous crystallization production on nickel sulfate, and can force circulation of the crystallization chamber through a circulation pump to achieve control of the size of the crystal particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 Schematic diagram of the structure of the crystallizer.

[0016] 1. Crystallization chamber; 10. Feed pipe; 101. Feed regulating valve; 11. Second liquid outlet; 12. Feed outlet; 13. First liquid outlet; 14. Crystal outlet; 2. Evaporation chamber; 21. Liquid level sensor; 22. Pressure gauge; 3. Circulation pump; 4. Crystal discharge pump; 5. Centrifuge; 6. Condenser; 7. Condensate collection tank; 8. Vacuum pump; 81. Vacuum regulating valve. DETAILED DESCRIPTION

[0017] 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. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction and be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1-2 As shown, the nickel sulfate continuous crystallization system of the utility model includes a crystallizer, which includes an evaporation chamber 2 and a crystallization chamber 1 installed at the lower part of the evaporation chamber 2, the bottom of the evaporation chamber 2 is located in the crystallization chamber 1, and the bottom of the evaporation chamber 2 is provided with a connecting pipe that connects the evaporation chamber 2 and the inside of the crystallization chamber 1.

[0021] A feed port 12 is provided at the bottom of the evaporation chamber 2, a first liquid outlet 13 is provided at the upper part of the crystallization chamber 1, a second liquid outlet 11 and a crystal outlet 14 are provided at the lower part of the crystallization chamber 1, and the bottom of the connecting pipe is located below the horizontal plane where the second liquid outlet 11 is located; the crystal outlet 14 is located on the crystallization chamber 1 below the horizontal plane where the second liquid outlet 11 is located, and the crystal outlet 14 is also connected to a crystal discharge pump 4 through a pipeline, and the crystal discharge pump 4 is connected to a centrifuge 5 through a pipeline, and the centrifuge 5 is used to separate nickel sulfate crystals.

[0022] The feed port 12 is connected to a circulation pump 3 through a pipeline, and the circulation pump 3 is also connected to the first liquid outlet 13 and the second liquid outlet 11 through a pipeline. The pipeline between the first liquid outlet 13 and the circulation pump 3 is also connected to a feed pipe 10, and a feed regulating valve 101 is installed on the feed pipe 10, and the feed regulating valve 101 is used to adjust the feed amount of the feed pipe 10. The material in the crystallizer can be forced to circulate through the circulation pump 3, and due to the density difference formed by the difference in crystal particle size, in the ascending liquid flow, large crystals are suspended in the lower part, and small crystals are suspended in the middle and upper part, among which large crystals of 0.6 to 1.0 mm at the bottom are discharged through the crystal slurry outlet, and then separated by the centrifuge 5 to obtain the desired product. Among them, the medium-sized crystals of 0.3-0.6 mm at the bottom flow out through the second liquid outlet 11 and the crystals less than 0.05 mm entrained in the middle flow out through the first liquid outlet 13, and then enter the forced circulation pump 3 after merging with the saturated nickel sulfate solution. Driven by the impeller of the circulation pump 3, they are pumped into the gas-liquid separation area at the top of the evaporation chamber 2. In the low-pressure separation section, the superheated solution is partially vaporized and flashed to form a supersaturated solution. When the feed liquid circulates into the bottom, most of the supersaturation formed by overheating grows into large-sized crystals through attachment to the surface of the circulating medium-sized crystals, and a small part forms new crystal nuclei to be eliminated.

[0023] A liquid level sensor 21 and a pressure gauge 22 are also installed on the evaporation chamber 2. The liquid level sensor 21 is installed on the evaporation chamber 2 above the horizontal plane where the top of the connecting pipe is located, and the pressure sensor is located above the liquid level sensor 21. The liquid level sensor 21 and the feed regulating valve 101 (solenoid valve) can be connected to the same controller to realize the linkage of the liquid level sensor 21 and the feed regulating valve 101, so that the system can operate stably.

[0024] The top of the evaporation chamber 2 is also connected to a condenser 6 through a pipeline, and a condensate collecting tank 7 and a vacuum pump 8 are connected to the condenser 6. The condenser 6 is connected to the vacuum pump 8 through a pipeline, and a vacuum regulating valve 81 is also installed on the pipeline between the condenser 6 and the vacuum pump 8. The vacuum degree in the evaporation chamber 2 can be controlled by the vacuum pump 8 and the vacuum regulating valve 81. The pressure sensor is also connected to the same controller as the vacuum regulating valve 81 (solenoid valve), so that the pressure sensor is also linked to the vacuum regulating valve 81, so that the system can operate stably.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nickel sulfate continuous crystallization system, comprising a crystallizer, wherein the crystallizer comprises an evaporation chamber and a crystallization chamber installed below the evaporation chamber, wherein the bottom of the evaporation chamber is located in the crystallization chamber, and a connecting pipe is provided at the bottom of the evaporation chamber to connect the evaporation chamber with the interior of the crystallization chamber; characterized in that: A feed port is provided at the bottom of the evaporation chamber, a first liquid outlet is provided at the upper part of the crystallization chamber, a second liquid outlet and a crystal outlet are provided at the lower part of the crystallization chamber, and the crystal outlet is located on the crystallization chamber below the horizontal plane where the second liquid outlet is located. A circulation pump is connected to the feed port through a pipeline, and the circulation pump is also connected to the first liquid outlet and the second liquid outlet through a pipeline, and a feed pipe is also connected to the pipeline between the first liquid outlet and the circulation pump.

2. A nickel sulfate continuous crystallization system according to claim 1, characterized in that: A feed regulating valve is installed on the feed pipe.

3. A nickel sulfate continuous crystallization system according to claim 1, characterized in that: The crystal outlet is also connected to a crystal discharging pump via a pipeline, and the crystal discharging pump is connected to a centrifuge via a pipeline.

4. A nickel sulfate continuous crystallization system according to claim 1, characterized in that: A liquid level sensor and a pressure gauge are also installed on the evaporation chamber.

5. A nickel sulfate continuous crystallization system according to claim 1, characterized in that: The top of the evaporation chamber is also connected to a condenser through a pipeline, and the condenser is connected to a condensate collecting tank and a vacuum pump.

6. A nickel sulfate continuous crystallization system according to claim 5, characterized in that: The condenser is connected to the vacuum pump through a pipeline, and a vacuum regulating valve is also installed on the pipeline between the condenser and the vacuum pump.

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