CN116020139A - A New Evaporator for Nickel Removal in Copper Electrolysis Production - Google Patents

Abstract

The invention discloses a novel nickel-removing evaporating kettle for copper electrolysis production, which comprises a kettle body, an anti-corrosion base layer, a brick lining layer, a high-level tank, a vacuum evaporation circulation pump, a plate heat exchanger and a liquid storage device; the high-level tank is connected to the Kettle body; both ends of the vacuum evaporation circulation pump are respectively connected to the kettle body and the plate heat exchanger; the plate heat exchanger is connected to the kettle body; the evaporation circulation pump is also connected to a liquid storage device; Exhaust pipe; the exhaust pipe is connected with a water jet vacuum generating device; the anti-corrosion base layer is set on the inner and outer surfaces of the kettle body; the lining layer includes the top lining layer, the middle lining layer and the bottom lining layer; the bottom of the top cover There is a connecting ring of the kettle neck; a fixing groove is provided on the connecting ring of the kettle neck; the fixing groove matches the top of the kettle body; the top of the kettle body slopes downward, forms an arc and is smoothly connected with the side of the kettle body. The device of the invention can realize high-efficiency and energy-saving evaporation and concentration of the electrolyte, and can also protect the body of the evaporation kettle from being corroded and collapsed.

Description

A New Evaporator for Nickel Removal in Copper Electrolysis Production

technical field

The invention belongs to the technical field of metallurgical equipment, and relates to a novel nickel-removing evaporator for copper electrolytic production.

Background technique

In the copper electrolytic refining process, it is necessary to control the ionic composition of the electrolyte. Affected by the raw materials, the nickel ions in the electrolyte are constantly rising and falling in the electrolyte system, and the electrolyte needs to be treated with nickel removal to meet the requirements of electrolytic refining. In the nickel removal process, the evaporation and concentration process is particularly critical. Good evaporation and concentration can increase the concentration of nickel ions in the electrolyte, which is conducive to the rapid removal of nickel ions in the system. The concentrated electrolyte is cooled by a water-cooled crystallization tank, and obtained after vacuum filtration Crude nickel sulfate product, thereby removing nickel ions.

At present, among the nickel ion evaporation and concentration processes in use in China, the evaporation and concentration processes used are almost all one of electric evaporation concentration or enamel kettle concentration. Both forms have their advantages and disadvantages, but both have the problems of high energy consumption and low nickel removal efficiency. Especially when the nickel ion content in the raw material is high, this problem is more prominent. A large amount of nickel ions enter the electrolyte system, and if they cannot be removed in time, it will seriously affect the balance of the electrolyte system, thereby reducing the pass rate of cathode copper.

At the same time, the evaporator commonly used in the evaporation and concentration process is a metal evaporator. During the evaporation and concentration process, the concentration of nickel sulfate solution inside the evaporator is as high as 700g/l, the temperature is 90°C, and the normal operating pressure of the evaporator is -60KPa~-80KPa. Metal evaporators are susceptible to corrosion in high concentration, high temperature, and low pressure environments, and high temperature and vacuum environments require greater strength for evaporators. Vacuum environments can easily cause the top of the evaporator to collapse and deform, affecting the life of the equipment.

Contents of the invention

The purpose of the present invention is to solve the problems of low evaporation process efficiency, high energy consumption, weak corrosion resistance and insufficient negative pressure resistance of the evaporation kettle in the prior art, and propose a new type of nickel removal evaporation kettle for copper electrolytic production. The device can realize high-efficiency and energy-saving electrolyte evaporation and concentration, protect the body of the evaporation kettle from corrosion, and has excellent negative pressure resistance, which can ensure that the evaporation kettle will not collapse.

In order to achieve the above object, the present invention adopts the following technical solutions:

A new type of nickel-removing evaporator for copper electrolysis production, including a kettle body, an anti-corrosion base layer, a brick lining layer, a high-level tank, a vacuum evaporation circulation pump, a plate heat exchanger, and a liquid storage device; the high-level tank is connected with an inlet Feed pipe; the feed pipe leads into the kettle body from the bottom; the inlet of the vacuum evaporation circulation pump is connected to the feed pipe, and the outlet is connected to the inlet of the plate heat exchanger; the outlet of the plate heat exchanger is connected to the circulation Liquid pipe; the circulating liquid pipe leads into the kettle body; a discharge pipe is connected on the pipeline between the evaporation circulation pump and the plate heat exchanger; the discharge pipe leads into the liquid storage device; the kettle The top of the body is provided with a top cover; the top cover is connected with an exhaust pipe; the exhaust pipe is connected with a water jet vacuum generating device; the anti-corrosion base is arranged on the inner and outer surfaces of the kettle body; the lining brick The layer includes the top lining brick layer, the middle lining brick layer and the bottom lining brick layer which are respectively arranged on the inside of the top, middle and bottom of the kettle body; the inlet pipe lining brick layer is also arranged in the kettle body; The inlet pipe lining brick layer leads into the kettle body; the bottom of the top cover is connected with a kettle neck connecting ring; the kettle neck connecting ring is provided with a fixing groove; the fixing groove is connected with the top of the kettle body and the top lining brick layer The combination of the kettle body is matched; the top of the kettle body is inclined downward, and then bent to form an arc, which is smoothly connected with the side of the kettle body.

The elevated tank is used to hold the electrolyte; the vacuum evaporation circulation pump is used to pump the electrolyte in the elevated tank into the plate heat exchanger through the feed pipe; the plate heat exchanger is used to heat the electrolyte; The discharge pipe is used to discharge the qualified electrolyte that has completed the evaporation step into the liquid storage device; the exhaust pipe is used for exhaust; the water jet vacuum generating device uses high-speed water flow to form a negative pressure to guide gas and heat It is discharged from the exhaust pipe to form a negative pressure inside the kettle body; the kettle body is used for evaporation and concentration of the electrolyte; the anti-corrosion base layer is used to protect the kettle body and prevent the kettle body from being corroded; the kettle neck connecting ring is used for It is used to connect the top cover and the kettle body; the fixing groove matches the combination of the top of the kettle body and the top lining brick layer, which facilitates the installation and fixing of the kettle body, and at the same time, the installation form of snapping into the fixing groove strengthens the strength of the top edge of the kettle body; the kettle body The top of the body slopes downwards, and then bends to form a circular arc, which is smoothly connected with the side of the kettle body. This design can strengthen the strength of the top of the kettle body and prevent negative pressure from causing the top of the kettle body to sag.

As a further technical improvement, the radius length of the arc formed on the top of the kettle body is at least equal to one tenth of the inner diameter of the kettle body, and the radius length of the arc is at least equal to three times the thickness of the kettle body. This design makes the arc position of the lower edge of the top of the kettle body stronger and avoids the top of the kettle body from being depressed due to internal negative pressure.

As a further technical improvement, the water-jet vacuum generating device includes a water jet and a water pipe; the diameter of one end of the water pipe is thicker than the other end; the water jet and the exhaust pipe are connected to the water pipe. pipeline. The water ejector ejects high-speed water flow to generate subsonic flow in the nozzle of the ejection pipe, thereby forming a vacuum, and its principle is the same as that of the jet vacuum generating device.

As a further technical improvement, the anti-corrosion base layer on the top of the kettle body is resin cement, and an anti-corrosion porcelain material is laid outside the resin cement; the anti-corrosion base layer in the middle of the kettle body is resin glass fiber reinforced plastic, and at least five layers of glass are laid outside the resin glass fiber reinforced plastic. Fiber grid cloth, glass fiber grid cloth coated with resin material; the anti-corrosion base layer at the bottom of the kettle body is resin cement. The resin cement is a polymer molecule modified base polymer waterproof and anti-corrosion material, which has good anti-corrosion performance and can protect the kettle body from corrosion; Corrosion characteristics; the glass fiber mesh cloth is based on glass fiber woven fabric, soaked in polymer anti-emulsion coating, has good corrosion resistance, flexibility, and high tensile strength in warp and weft directions, can enhance The strength of the kettle body.

As a further technical improvement, the kettle body is also provided with a blocking brick; the blocking brick is directly facing the lining brick layer of the inlet pipe. The flow blocking brick plays the role of blocking and alleviating the water flow, and can effectively reduce the impact of the liquid on the inner wall of the kettle.

As a further technical improvement, valves are provided on the feed pipe, exhaust pipe and discharge pipe. The valve is used to control the on-off of the pipeline.

As a further technical improvement, the bottom of the kettle body is provided with supporting feet. The supporting legs are used to support the still body.

As a further technical improvement, the neck connecting ring is provided with connecting screw holes; the neck connecting ring and the top cover are connected by bolts. The connecting screw holes are used for passing through bolts to connect the kettle neck connecting ring with the top cover.

The method of using the above-mentioned new type of nickel removal evaporator for copper electrolysis production:

The electrolyte enters the kettle body from the high level tank through the feed pipe from the bottom; at the same time, the vacuum evaporation circulation pump pumps the electrolyte into the plate heat exchanger for heating, and then passes through the circulating liquid pipe from the inlet pipe lining brick layer to the kettle body; The evaporating circulation pump continuously pumps out the electrolyte in the kettle body, and then passes it into the kettle body after being heated by a plate heat exchanger. This reciprocates to realize the heating and evaporation of the electrolyte solution; the hot steam generated in the kettle body is under the action of a water jet vacuum generator It is discharged from the exhaust pipe to form a negative pressure inside the kettle body. After the electrolyte evaporates inside the negative pressure kettle body, the concentration of nickel ions increases, which is beneficial to the subsequent removal of nickel; after reaching the standard, the electrolyte is discharged from the discharge pipe into the component liquid storage device; during the above evaporation process, the anti-corrosion base layer can protect the surface of the kettle body to avoid corrosion; the brick lining layer can increase the support of the kettle body and improve the strength of the kettle body; the top of the kettle body and the top lining After the brick layers are combined, they penetrate into the fixing groove. When negative pressure is generated inside the kettle body and the top of the kettle body is subjected to external air pressure, the external pressure can be decomposed into a lateral force on the top of the kettle body and a vertical downward force; The force finally acts on the fixing groove, and the vertical force acts on the side wall of the kettle body. Both the fixing groove and the side wall of the kettle body support the top of the kettle body to prevent the top of the kettle body from forming a depression.

Compared with the prior art, the present invention has the beneficial effects:

1. The device of the present invention can continuously heat the electrolyte and circulate it inside and outside the kettle body through the vacuum evaporation circulation pump and the plate heat exchanger, and form a negative pressure in the kettle body through the water jet vacuum generating device, which is beneficial to the rapid recovery of the electrolyte. Evaporation, improve efficiency and save energy consumption.

2. The device of the present invention performs anti-corrosion protection on the kettle body through the anti-corrosion base layer, so that the corrosion resistance of the surface of the kettle body used for negative pressure evaporation is improved, so that the kettle body is not easy to be corroded.

3. The device of the present invention fixes and supports the top of the kettle body through the connecting ring of the kettle neck. At the same time, the lower edge of the top of the kettle body is treated with a circular arc, which enhances the strength of the top of the kettle body and makes it difficult for the top of the kettle body to be damaged due to negative pressure inside the kettle. sunken.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the device of the present invention.

FIG. 2 is an enlarged schematic view of position A in FIG. 1 .

Fig. 3 is a structural schematic diagram of the still neck connecting ring and the top of the still body.

Figure 4 is a schematic diagram of force analysis between the connecting ring of the neck of the kettle and the top of the kettle body.

Reference signs: 1-kettle body, 2-anticorrosion base layer, 3-top lining brick layer, 4-middle lining brick layer, 5-bottom lining brick layer, 6-baffle brick, 7-discharging pipe, 8-inlet Pipe lining brick layer, 9-feed pipe, 10-water injector, 11-top cover, 12-exhaust pipe, 13-support foot, 14-circulating liquid pipe, 15-valve, 16-kettle neck connection ring, 17-fixing tank, 18-connecting screw hole, 19-water pipe, 20-arc, 21-high tank, 22-vacuum evaporation circulation pump, 23-plate heat exchanger, 24-liquid storage device;

F-the external air pressure on the top of the kettle body, F1-the lateral force on the top of the kettle body, and F2 the vertical downward force.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Example 1:

As shown in Figure 1-4, a new type of nickel removal evaporation kettle for copper electrolysis production, including kettle body 1, anti-corrosion base layer 2, brick lining layer, elevated tank 21, vacuum evaporation circulation pump 22, plate heat exchanger 23 And become liquid storage device 24; Described header tank 21 is connected with feed pipe 9; Described feed pipe 9 passes into still body 1 from the bottom; The inlet of described vacuum evaporation circulation pump 22 connects feed pipe 9, and the outlet connects The inlet of the plate heat exchanger 23; the outlet of the plate heat exchanger 23 is connected to the circulation liquid pipe 14; the circulation liquid pipe 14 leads into the still body 1; The discharge pipe 7 is connected on the pipeline between 23; the discharge pipe 7 leads into the liquid storage device 24; the top of the kettle body 1 is provided with a top cover 11; the top cover 11 is connected with an exhaust pipe 12; the exhaust pipe 12 is connected with a water jet vacuum generating device; the anti-corrosion base layer 2 is arranged on the inner and outer surfaces of the kettle body 1; The top lining brick layer 3, the middle lining brick layer 4 and the bottom lining brick layer 5 on the inner side of the bottom; the inlet pipe lining brick layer 8 is also arranged in the said kettle body 1; Pass into the kettle body 1; the bottom of the top cover 11 is connected with a kettle neck connecting ring 16; the kettle neck connecting ring 16 is provided with a fixing groove 17; the fixing groove 17 is connected with the top of the kettle body 1 and the top lining The combination of brick layers 3 is matched; the top of the kettle body 1 is inclined downwards and then bent to form an arc 20 which is smoothly connected with the side of the kettle body 1 .

The radius length of the arc 20 formed on the top of the kettle body 1 is at least equal to one tenth of the inner diameter of the kettle body 1 , and the radius length of the arc 20 is at least equal to three times the thickness of the kettle body 1 .

The water jet vacuum generating device comprises a water ejector 10 and a water pipeline 19; the diameter of one end of the water pipeline 19 is thicker than the other end; the water jet 10 and the exhaust pipe 12 are connected to the water pipeline 19.

The anti-corrosion base layer 2 on the top of the kettle body 1 is resin cement, and an anti-corrosion porcelain material is laid outside the resin cement; the anti-corrosion base layer 2 in the middle of the kettle body 1 is resin glass fiber reinforced plastic, and at least five layers of glass fiber squares are laid outside the resin glass fiber reinforced plastic. The grid cloth is coated with resin material on the outside of the glass fiber grid cloth; the anti-corrosion base layer 2 at the bottom of the kettle body 1 is resin cement.

The kettle body 1 is also provided with a flow blocking brick 6;

Valves 15 are all provided on the feed pipe 9 , the exhaust pipe 12 and the discharge pipe 7 .

The using method of the present invention is as follows:

The electrolyte enters the kettle body 1 from the head tank 21 through the feed pipe 9 from the bottom; at the same time, the vacuum evaporation circulating pump 22 pumps the electrolyte into the plate heat exchanger 23 for heating, and then passes through the circulating liquid pipe 14 from the inlet pipe lining brick layer 8 The position is connected to the kettle body 1; the vacuum evaporation circulation pump 22 continuously pumps out the electrolyte in the kettle body 1, and then passes it into the kettle body 1 after being heated by the plate heat exchanger 23, so that the heating and evaporation of the electrolyte is realized reciprocatingly; the kettle body 1 The hot steam generated inside is discharged from the exhaust pipe 12 under the action of the water jet vacuum generating device, so that a negative pressure is formed inside the kettle body 1, and after the electrolyte evaporates inside the negative pressure kettle body 1, the concentration of nickel ions increases. It is beneficial to the subsequent removal of nickel; after reaching the standard, the electrolyte is discharged from the discharge pipe 7 into the liquid storage device for storage 24; during the above evaporation process, the anti-corrosion base layer 2 plays a role in protecting the surface of the kettle body 1 to avoid corrosion; lining bricks The layer plays the role of increasing the support of the kettle body 1 and improving the strength of the kettle body 1; the top of the kettle body 1 and the top lining brick layer 3 are combined and penetrate into the fixing groove 17. When negative pressure is generated inside the kettle body 1, the top of the kettle body 1 is subjected to When the external air pressure F, the external pressure F can be decomposed into the lateral force F1 on the top of the kettle body 1 and the vertical downward force F2; the lateral force F1 finally acts on the fixing groove 17, and the vertical force F2 acts on the kettle body 1. The side wall of the body 1, the fixing groove 17 and the side wall of the kettle body 1 all support the top of the kettle body 1 to prevent the top of the kettle body 1 from forming a depression.

Example 2:

The difference between this embodiment and Embodiment 1 is that: the bottom of the kettle body 1 is provided with supporting feet 13 .

The usage method of this embodiment is the same as that of Embodiment 1.

Example 3:

The difference between this embodiment and Embodiment 2 is that: the neck connecting ring 16 is provided with a connecting screw hole 18; the neck connecting ring 16 and the top cover 11 are connected by bolts.

The usage method of this embodiment is the same as that of Embodiment 1.

Example 4:

The difference between this embodiment and embodiment 3 is that: the bottom of the kettle body 1 is provided with supporting feet 13 . The neck connecting ring 16 is provided with a connecting screw hole 18; the neck connecting ring 16 and the top cover 11 are connected by bolts.

The usage method of this embodiment is the same as that of Embodiment 1.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (8)

1. A new type of nickel-removing evaporator for copper electrolysis production, characterized in that it includes a kettle body (1), an anti-corrosion base layer (2), a brick lining layer, a high-level tank (21), and a vacuum evaporation circulation pump (22) , plate heat exchanger (23) and liquid storage device (24); The head tank (21) is connected with a feed pipe (9); the feed pipe (9) leads into the kettle body (1) from the bottom; the inlet of the vacuum evaporation circulating pump (22) is connected with the feed pipe ( 9), the outlet is connected to the inlet of the plate heat exchanger (23); the outlet of the plate heat exchanger (23) is connected to the circulating liquid pipe (14); the circulating liquid pipe (14) is connected to the kettle body ( 1); the discharge pipe (7) is connected to the pipeline between the evaporation circulation pump (22) and the plate heat exchanger (23); the discharge pipe (7) leads into the liquid storage device (24 ); the top of the kettle body (1) is provided with a top cover (11); the top cover (11) is connected with an exhaust pipe (12); the exhaust pipe (12) is connected with a water jet vacuum generator device; The anti-corrosion base layer (2) is arranged on the inner and outer surfaces of the kettle body (1); the brick lining layer includes a top brick lining layer (3), which is respectively arranged on the top, middle and bottom inside of the kettle body (1), The middle lining brick layer (4) and the bottom lining brick layer (5); the inlet pipe lining brick layer (8) is also provided in the kettle body (1); the circulating liquid pipe (14) is connected from the inlet pipe lining brick layer (8) into the kettle body (1); The bottom of the top cover (11) is connected with a kettle neck connecting ring (16); the kettle neck connecting ring (16) is provided with a fixing groove (17); the fixing groove (17) and the kettle body (1) The top of the kettle body (1) and the combination of the top lining brick layer (3) are matched; the top of the kettle body (1) is inclined downward, and then bent to form an arc (20), and the arc (20) and the kettle body (1) The sides are connected smoothly. 2. The new nickel-removing evaporator for copper electrolytic production according to claim 1, characterized in that: the radius length of the arc (20) formed on the top of the kettle body (1) is at least equal to that of the kettle body (1) One tenth of the inner diameter, and the radius length of the arc (20) is at least equal to three times the thickness of the kettle body (1). 3. The new nickel-removing evaporator for copper electrolysis production according to claim 1, characterized in that: the water jet vacuum generating device includes a water jet (10) and a water pipe (19); The diameter of one end of the water conduit (19) is thicker than the other end; the water injector (10) and the exhaust pipe (12) are connected to the water conduit (19). 4. The new nickel-removing evaporating kettle for copper electrolysis production according to claim 1, characterized in that: the anti-corrosion base layer (2) on the top of the kettle body (1) is resin cement, and anti-corrosion porcelain is laid outside the resin cement quality material; the anti-corrosion base (2) in the middle of the kettle body (1) is resin glass fiber reinforced plastic, and at least five layers of glass fiber grid cloth are laid outside the resin glass fiber reinforced plastic, and the glass fiber grid cloth is coated with resin material; The anticorrosion base (2) at the bottom of the kettle body (1) is resin cement. 5. The new nickel-removing evaporating kettle for copper electrolysis production according to claim 1, characterized in that: the kettle body (1) is also provided with a flow blocking brick (6); the flow blocking brick (6 ) is facing the inlet pipe lining brick layer (8). 6. The new nickel removal evaporator for copper electrolysis production according to claim 1, characterized in that: the feed pipe (9), the exhaust pipe (12) and the discharge pipe (7) are all equipped with There is a valve (15). 7. The new nickel-removing evaporator for copper electrolysis production according to claim 1, characterized in that: the bottom of the kettle body (1) is provided with supporting feet (13). 8. The new nickel-removing evaporator for copper electrolysis production according to claim 1, characterized in that: the neck connecting ring (16) is provided with connecting screw holes (18); the neck connecting ring (16) and the top cover (11) are connected by bolts.

Images