A nickel bean dissolving process and reaction device thereof

Abstract

The invention discloses a nickel bean dissolution process and a reaction device thereof, comprising the following process steps: (1) starting a blower and an absorption tower spray circulation delivery pump of an absorption tower corresponding to a nickel bean dissolution reaction device; (2) starting a pneumatic valve and a delivery pump of deionized water; (3) adding 3.0 tons of nickel beans through a feeding hopper of a feeding port; (4) opening a stirring device of the nickel bean dissolution reaction device, and then opening a pneumatic valve and a delivery pump of concentrated sulfuric acid; (5) opening a temperature interlock control switch, and controlling the reaction temperature by steam; (6) opening a pneumatic valve and a delivery pump of hydrogen peroxide; (7) continuing to react for 1.5-2 hours before the dissolution reaction ends. The present invention has the advantages of solving the problem of requiring a large number of on-site personnel when carrying out a nickel bean dissolution reaction process and avoiding the problems of production safety accidents such as bubbling grooves, hydrogen explosions, and fire accidents that exist during the reaction process.

Description

Technical Field

[0001] The invention relates to the technical field of nickel dissolution and recovery, in particular to a nickel bean dissolution process and a reaction device thereof. Background Art

[0002] Nickel beans are a kind of metallic nickel raw material containing about 99.5% nickel. The common weight of a single nickel bean is about 70g, and it is packed in ton bags. In the existing production process, nickel beans are added to a fixed reaction device for reaction. Some companies use PPH reaction devices, while others use steel-lined brick reaction devices. Each has its own strengths and weaknesses. For example, the PPH reaction device has the disadvantages of poor strength and insufficient temperature resistance. The steel-lined brick reaction device has high strength, but the lining bricks reduce the effective volume of the reaction device, and it is difficult to repair when the lining bricks fall off, and even have to be replaced as a whole.

[0003] Different reaction devices and internal structures result in different reaction effects. At the same time, a large amount of hydrogen will be produced during the nickel bean dissolution reaction, which is prone to safety accidents such as explosions and fires. The treatment processes corresponding to different reaction devices are also very different. The traditional nickel bean dissolution process is extensive, and production safety accidents such as bubbling, hydrogen explosions, and fire accidents often occur during the nickel bean dissolution reaction. Moreover, the traditional nickel bean dissolution process also requires a lot of operators on site to be responsible for process monitoring, material transportation and other operations. Therefore, a reasonable and applicable reactor can not only ensure the safety of the reaction process, but also make the reaction achieve a higher efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a nickel bean dissolution process and a reaction device thereof, which have the advantages of solving the problem of requiring a large number of on-site personnel when carrying out the nickel bean dissolution reaction process and avoiding production safety accidents such as bubbling, hydrogen explosion, fire accidents, etc. in the reaction process.

[0005] The technical solution of the present invention is a nickel bean dissolving process, comprising the following process steps:

[0006] 1) Start the fan of the absorption tower corresponding to the nickel bean dissolution reaction device and the absorption tower spray circulation delivery pump;

[0007] 2) Start the pneumatic valve and deionized water delivery pump of deionized water, and add 15-20m 3 After adding water, close the deionized water delivery pump and pneumatic valve;

[0008] 3) Add 3.0 tons of nickel beans through the feeding hopper at the feeding port. After the nickel beans are added, return to the DCS for automatic operation;

[0009] 4) Turn on the stirring device of the nickel bean dissolution reaction device, then open the concentrated sulfuric acid pneumatic valve, start the concentrated sulfuric acid delivery pump, and add 2.5-3.0m 3 After the concentrated sulfuric acid is added and the pH value reaches 1.5-2.0, close the concentrated sulfuric acid delivery pump and the pneumatic valve;

[0010] 5) After the concentrated sulfuric acid is added, turn on the temperature interlock control switch, control the reaction temperature by steam, and stop automatic heating after 6-8 hours of reaction;

[0011] 6) Open the hydrogen peroxide pneumatic valve, start the hydrogen peroxide delivery pump, and add 0.3-0.5m 3 After the addition of hydrogen peroxide is completed and the pH value reaches 3.5-5.5, close the hydrogen peroxide delivery pump and the pneumatic valve;

[0012] 7) After the addition of hydrogen peroxide is completed, the reaction is continued for 1.5-2 hours and then the dissolution reaction is completed.

[0013] In the aforementioned nickel bean dissolution process, the addition rate of concentrated sulfuric acid in step 4 needs to be controlled at 1.5-2m 3 / h, the mass percentage concentration of the concentrated sulfuric acid is 98%.

[0014] In the aforementioned nickel bean dissolving process, when the temperature exceeds 85°C during the addition of concentrated sulfuric acid, the acid addition is suspended, and the concentrated sulfuric acid is allowed to cool naturally to 75°C before the acid addition is resumed.

[0015] In the aforementioned reaction device for the nickel bean dissolving process, the device includes a kettle body, a kettle bottom and a kettle cover, a plurality of baffles are connected to the inside of the kettle body in the vertical direction, the baffles are evenly distributed in the kettle body, a first reinforcing rib is arranged on the baffles, the inner wall of the kettle body and the outer wall of the baffle are bonded with an inner liner by sealant, and a stirring device is provided downward at the center position of the kettle cover.

[0016] In the aforementioned reaction device of the nickel bean dissolution process, the stirring device includes a stirring shaft, a stirring paddle and a support, the support is fixed at the center position of the kettle cover, the support is connected to the stirring shaft, and the stirring paddle is arranged at the bottom of the stirring shaft.

[0017] In the aforementioned reaction device of the nickel bean dissolution process, the kettle cover is provided with an exhaust port and an instrument detection port, and the exhaust port and the instrument detection port are respectively located on both sides of the support. The kettle cover is also provided with an observation port, a feeding port and a temperature monitoring device, and the temperature monitoring device includes a sleeve, and a probe is arranged at the bottom of the sleeve.

[0018] In the aforementioned reaction device of the nickel bean dissolving process, an overflow port is provided at the upper end of the side wall of the kettle body, and a discharge port and a drain port are provided at the lower end of the side wall of the kettle body, and the discharge port is located on the upper side of the drain port.

[0019] In the aforementioned reaction device for the nickel bean dissolving process, the kettle cover is connected to the kettle body via fixing screws and nuts, and the kettle cover is provided with a second reinforcing rib. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a process flow chart of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0023] Figure numerals: 1, kettle body; 11, baffle; 111, first reinforcing rib; 12, liner; 13, overflow port; 14, discharge port; 15, drain port; 2, kettle bottom; 3, kettle cover; 31, stirring device; 311, stirring shaft; 312, stirring paddle; 313, support; 32, exhaust port; 33, instrument detection port; 34, observation port; 35, feeding port; 36, temperature monitoring device; 361, casing; 362, probe; 37, second reinforcing rib. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0025] Embodiment 1: A nickel bean dissolving process and a reaction device thereof, comprising the following steps:

[0026] (1) Remotely start the fan of the absorption tower and the spray circulation pump of the absorption tower corresponding to the nickel bean dissolution reaction device through DCS;

[0027] (2) DCS starts the pneumatic valve and deionized water delivery pump for deionized water and adds 15m 3 After adding water, close the deionized water delivery pump and pneumatic valve;

[0028] (3) 3.0 tons of nickel beans are manually added through the feeding hopper at the feeding port. After the manual feeding of nickel beans is completed, it is returned to the DCS for automatic operation;

[0029] (4) The DCS controls and automatically opens the stirring device 31 of the nickel bean dissolving reaction device. Then the DCS opens the concentrated sulfuric acid pneumatic valve and starts the concentrated sulfuric acid delivery pump to add 2.5 m 3 The concentrated sulfuric acid was added at a rate of 1.5 m / s.3 / h, after the concentrated sulfuric acid is added and the pH value reaches 1.5, the concentrated sulfuric acid delivery pump and the pneumatic valve are closed. The mass percentage concentration of concentrated sulfuric acid can be 98%. If the temperature exceeds 87°C during the process of adding concentrated sulfuric acid, it is necessary to suspend the acid addition, let it cool naturally to 75°C, and then resume the acid addition;

[0030] (5) After the concentrated sulfuric acid is added, the DCS control automatically opens the temperature interlock control switch, controls the reaction temperature at 85°C through steam, and stops automatically heating after 6 hours of reaction;

[0031] (6) The DCS controls the automatic opening of the hydrogen peroxide pneumatic valve, the start of the hydrogen peroxide delivery pump, and the addition of 0.3 m 3 After the addition of hydrogen peroxide is completed and the pH value reaches 3.5, close the hydrogen peroxide delivery pump and the pneumatic valve. The mass percentage concentration of hydrogen peroxide can be 27.5%;

[0032] (7) After the addition of hydrogen peroxide was completed, the reaction was continued for 1.5 hours and then the dissolution reaction was completed.

[0033] Embodiment 2: A nickel bean dissolving process and a reaction device thereof, comprising the following steps:

[0034] (1) Remotely start the fan of the absorption tower and the spray circulation pump of the absorption tower corresponding to the nickel bean dissolution reaction device through DCS;

[0035] (2) DCS starts the pneumatic valve and deionized water delivery pump to add 17.5m 3 After adding water, close the deionized water delivery pump and pneumatic valve;

[0036] (3) 3.0 tons of nickel beans are manually added through the feeding hopper at the feeding port. After the manual feeding of nickel beans is completed, it is returned to the DCS for automatic operation;

[0037] (4) The DCS automatically turns on the stirring device 31 of the nickel bean dissolving reaction device, and then the DCS opens the concentrated sulfuric acid pneumatic valve and starts the concentrated sulfuric acid delivery pump to add 2.75 m 3 The concentrated sulfuric acid was added at a rate of 1.75 m / s. 3 / h, after the concentrated sulfuric acid is added and the pH value reaches 1.75, the concentrated sulfuric acid delivery pump and the pneumatic valve are closed. The mass percentage concentration of concentrated sulfuric acid can be 98%. If the temperature exceeds 87°C during the process of adding concentrated sulfuric acid, it is necessary to suspend the acid addition, let it cool naturally to 75°C, and then resume the acid addition;

[0038] (5) After the concentrated sulfuric acid is added, the DCS control automatically opens the temperature interlock control switch, controls the reaction temperature at 87.5°C through steam, and stops automatically heating after 7 hours of reaction;

[0039] (6) The DCS controls the automatic opening of the hydrogen peroxide pneumatic valve, the start of the hydrogen peroxide delivery pump, and the addition of 0.4 m 3 After the addition of hydrogen peroxide is completed and the pH value reaches 4.5, the hydrogen peroxide delivery pump and the pneumatic valve are closed, and the mass percentage concentration of hydrogen peroxide can be 27.5%;

[0040] (7) After the addition of hydrogen peroxide was completed, the reaction was continued for 1.75 hours and the dissolution reaction was completed.

[0041] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A nickel bean dissolving process, characterized in that: The process steps include: 1) Start the fan of the absorption tower corresponding to the nickel bean dissolution reaction device and the absorption tower spray circulation delivery pump; 2) Start the pneumatic valve and deionized water delivery pump of deionized water, and add 15-20m 3 After adding water, close the deionized water delivery pump and pneumatic valve; 3) Add 3.0 tons of nickel beans through the feeding hopper at the feeding port. After the nickel beans are added, they are returned to the DCS for automatic operation; 4) Turn on the stirring device (31) of the nickel bean dissolution reaction device, then open the concentrated sulfuric acid pneumatic valve, start the concentrated sulfuric acid delivery pump, and add 2.5-3.0m 3 When the temperature of the concentrated sulfuric acid exceeds 85°C during the addition of the concentrated sulfuric acid, the addition of acid is suspended, and the concentrated sulfuric acid is allowed to cool naturally to 75°C before the addition of acid is resumed; the addition speed of the concentrated sulfuric acid should be controlled at 1.5-2m 3 / h, the mass percentage concentration of the concentrated sulfuric acid is 98%; after the addition of concentrated sulfuric acid is completed and the pH value reaches 1.5-2.0, the concentrated sulfuric acid delivery pump and the pneumatic valve are closed; 5) After the concentrated sulfuric acid is added, turn on the temperature interlock control switch, control the reaction temperature through steam, and stop automatic heating after 6-8 hours of reaction; 6) Open the hydrogen peroxide pneumatic valve, start the hydrogen peroxide delivery pump, and add 0.3-0.5m 3 After the addition of hydrogen peroxide is completed and the pH value reaches 3.5-5.5, close the hydrogen peroxide delivery pump and the pneumatic valve; 7) After the addition of hydrogen peroxide is completed, the reaction continues for 1.5-2 hours and then the dissolution reaction is completed; The nickel bean dissolving reaction device comprises a kettle body (1), a kettle bottom (2) and a kettle cover (3); a plurality of baffles (11) are connected to the inside of the kettle body (1) in a vertical direction; the baffles (11) are evenly distributed in the kettle body (1); a first reinforcing rib (111) is arranged on the baffles (11); an inner liner (12) is bonded to the inner wall of the kettle body (1) and the outer wall of the baffles (11) by means of a sealant; and a stirring device (31) is provided downwardly at the center of the kettle cover (3); The stirring device (31) comprises a stirring shaft (311), a stirring paddle (312) and a support (313); the support (313) is fixed at the center of the kettle cover (3); the support (313) is connected to the stirring shaft (311); and the stirring paddle (312) is arranged at the bottom of the stirring shaft (311); The kettle cover (3) is provided with an exhaust port (32) and an instrument detection port (33), the exhaust port (32) and the instrument detection port (33) are respectively located on two sides of the support (313), the kettle cover (3) is also provided with an observation port (34), a feeding port (35) and a temperature monitoring device (36), the temperature monitoring device (36) comprises a sleeve (361), and a probe (362) is provided at the bottom of the sleeve (361); An overflow port (13) is provided at the upper end of the side wall of the kettle body (1), and a discharge port (14) and a drain port (15) are provided at the lower end of the side wall of the kettle body (1), wherein the discharge port (14) is located above the drain port (15).

2. The nickel bean dissolving process according to claim 1, characterized in that: The kettle cover (3) is connected to the kettle body (1) via fixing screws and nuts, and the kettle cover (3) is provided with a second reinforcing rib (37).

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