Lateritic nickel ore hydrometallurgy precipitation system

Abstract

A lateritic nickel ore hydrometallurgy precipitation system. The lateritic nickel ore hydrometallurgy precipitation system comprises a reaction tank (100), a feeding assembly (200), and a discharging assembly (300), wherein the reaction tank (100) is internally provided with an accommodating cavity (110). The feeding assembly (200) comprises a first introducing pipe (210) and a second introducing pipe (220); the second introducing pipe (220) is communicated with the first introducing pipe (210); and the first introducing pipe (210) is communicated with the accommodating cavity (110). The discharging assembly (300) comprises a material lifting pipe (310) and an air guiding pipe (320); one end of the material lifting pipe (310) is communicated with the bottom of the accommodating cavity (110); the air guiding pipe (320) extends below the liquid level in the material lifting pipe (310); and the position where the air guiding pipe (320) is communicated with the material lifting pipe (310) is lower than the end of the material lifting pipe (310) distant from the accommodating cavity (110). Air is introduced into the material lifting pipe (310) by using the air guiding pipe (320), and due to the presence of bubbles in a solid-liquid mixture in the material lifting pipe (310), the liquid level in the material lifting pipe (310) rises under the action of atmospheric pressure, and finally the solid-liquid mixture at the bottom of the accommodating cavity (110) is discharged by means of the material lifting pipe (310). The system can directly discharge a precipitate at the bottom of the accommodating cavity (110), thereby avoiding frequent manual cleaning of residues in the accommodating cavity (110), and prolonging the cycle of manual cleaning of the reaction tank (100).

Description

A laterite nickel ore hydrometallurgical precipitation system Technical Field

[0001] The present invention relates to the field of metal smelting, and in particular to a laterite nickel ore wet smelting precipitation system. Background Art

[0002] The laterite nickel ore hydrometallurgical process can process low-grade laterite nickel ore, generally the limonite layer and transition layer of laterite nickel ore.

[0003] In the process of wet smelting of laterite nickel ore, the acidity and alkalinity of the solution are often changed, so that the metal ions in the solution react and precipitate, thereby removing the metal ions in the solution. The existing wet smelting precipitation system can be found in the patent application number CN201711120629.X, which consists of several reactors and thickeners connected in series. The solution and the neutralizer (alkali solution) are mixed evenly and added to the reactor. After passing through the reactor, it flows into the thickener and is concentrated to obtain an iron-containing precipitate. However, some precipitation will also be produced in the reactor, accumulate at the bottom, and cannot flow into the next equipment, resulting in the need for frequent manual cleaning.

[0004] Therefore, how to prevent sedimentation and accumulation at the bottom of the reactor is a technical problem that needs to be solved urgently.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to overcome the above technical deficiencies and propose a laterite nickel ore hydrometallurgical precipitation system to solve the technical problem of how to prevent sediment from accumulating at the bottom of the reactor in the prior art.

[0007] In order to achieve the above technical objectives, the technical solution of the present invention includes a laterite nickel ore hydrometallurgical precipitation system, which includes:

[0008] A reaction tank having a receiving cavity therein;

[0009] A feeding assembly comprising a first introduction pipe and a second introduction pipe, wherein the second introduction pipe is connected to the first introduction pipe, and the first introduction pipe is connected to the accommodating chamber;

[0010] The outlet assembly includes a material lifting pipe and an air guide pipe. One end of the material lifting pipe is connected to the bottom of the accommodating chamber. The air guide pipe extends below the liquid level in the material lifting pipe and ventilates the material lifting pipe to raise the liquid level in the material lifting pipe and allow the material in the material lifting pipe to be discharged from the port of the material lifting pipe.

[0011] Preferably, the feed assembly further comprises a third inlet pipe, and the third inlet pipe is connected to the lifting pipe.

[0012] Preferably, the third inlet pipe is connected to an end of the lifting pipe close to the accommodating chamber.

[0013] Preferably, the second introduction tube partially extends into the first introduction tube.

[0014] Preferably, the angle between the flow direction of the material in the first inlet pipe and the flow direction of the material in the second inlet pipe is an acute angle.

[0015] Preferably, the lifting pipe includes a main pipe and a secondary pipe, the main pipe is vertically arranged and extends into the accommodating cavity, the air guide pipe extends into the main pipe, one end of the secondary pipe is connected to the main pipe, and the other end of the secondary pipe is inclined downward.

[0016] Preferably, a shut-off valve is installed on the auxiliary pipe, and the shut-off valve controls the on-off of the auxiliary pipe.

[0017] Preferably, a regulating valve is installed on the air duct, and the regulating valve controls the opening of the air duct.

[0018] Preferably, the laterite nickel ore wet smelting precipitation system also includes a stirring assembly, which includes blades, a rotating shaft and a driving member. The rotating shaft is rotatably installed in the accommodating cavity, the blades are installed on the rotating shaft, and the driving member is transmission-connected to the rotating shaft to drive the rotating shaft to rotate.

[0019] Preferably, the driving member includes a motor, and the motor is directly connected to the rotating shaft.

[0020] Compared with the prior art, the beneficial effects of the present invention include: first, the metal ion solution is introduced into the accommodating chamber through the first inlet tube, and the neutralizer is introduced into the first inlet tube through the second inlet tube. The neutralizer and the metal ion solution are mixed with each other and then enter the accommodating chamber together. Since the pH value increases after the metal ion solution and the neutralizer are mixed, the metal ions will generate hydroxides and precipitate, and the precipitates will accumulate at the bottom of the accommodating chamber. The air duct is used to ventilate the feed pipe. Since bubbles are entrained in the solid-liquid mixture in the feed pipe, the overall density of the material in the feed pipe is lower than the overall density of the material in the accommodating chamber. Under the action of atmospheric pressure, the liquid level in the feed pipe will rise, and eventually the solid-liquid mixture at the bottom of the accommodating chamber will be discharged through the feed pipe. By using the laterite nickel ore wet smelting precipitation system provided by the present invention, the precipitate at the bottom of the accommodating chamber can be directly discharged, avoiding frequent manual cleaning of residues in the accommodating chamber and greatly extending the cycle of manual cleaning of the reaction tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of a laterite nickel ore hydrometallurgical precipitation system according to an embodiment of the present invention;

[0022] Among them, the reaction tank 100, the accommodating chamber 110, the outlet 120, the feeding assembly 200, the first inlet pipe 210, the second inlet pipe 220, the third inlet pipe 230, the outlet assembly 300, the lifting pipe 310, the main pipe 311, the auxiliary pipe 312, the stop valve 3121, the air guide pipe 320, the regulating valve 321, the stirring assembly 400, the blade 410, the rotating shaft 420, and the driving part 430. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Referring to Figure 1, an embodiment of the present invention provides a laterite nickel ore hydrometallurgical precipitation system, which belongs to the field of metal smelting. The laterite nickel ore hydrometallurgical precipitation system precipitates metal ions in the solution through chemical reactions and extracts solid precipitates. The above-mentioned laterite nickel ore hydrometallurgical precipitation system can extract metal precipitates from the bottom of the reaction vessel, avoiding the accumulation of precipitates, thereby extending the cycle of manual cleaning of the reaction vessel.

[0025] In some preferred embodiments, a laterite nickel ore hydrometallurgical precipitation system includes a reaction tank 100, a feed assembly 200, and a discharge assembly 300. The reaction tank 100 includes a receiving chamber 110. The feed assembly 200 includes a first inlet pipe 210 and a second inlet pipe 220. The second inlet pipe 220 is connected to the first inlet pipe 210, and the first inlet pipe 210 is connected to the receiving chamber 110. The discharge assembly 300 includes a feed pipe 310 and an air guide pipe 320. One end of the feed pipe 310 is connected to the bottom of the receiving chamber 110. The air guide pipe 320 extends below the liquid level in the feed pipe 310 and ventilates the feed pipe 310, thereby raising the liquid level in the feed pipe 310 and allowing the material in the feed pipe 310 to be discharged from the end of the feed pipe 310.

[0026] First, a metal ion solution is introduced into the receiving chamber 110 through the first inlet tube 210, and a neutralizer is introduced into the first inlet tube 210 through the second inlet tube 220. The neutralizer and metal ion solution are mixed and then enter the receiving chamber 110 together. As the pH of the metal ion solution and neutralizer increases after mixing, the metal ions will form hydroxides and precipitate, which will accumulate at the bottom of the receiving chamber 110. The air duct 320 is used to ventilate the material extraction pipe 310. Due to the air bubbles entrained in the solid-liquid mixture in the extraction pipe 310, the overall density of the material in the extraction pipe 310 is lower than that of the material in the receiving chamber 110. Under the action of atmospheric pressure, the liquid level in the extraction pipe 310 rises, and the solid-liquid mixture at the bottom of the receiving chamber 110 is eventually discharged through the extraction pipe 310. By using the laterite nickel ore wet smelting precipitation system provided by the present invention, the sediment at the bottom of the accommodating chamber 110 can be directly discharged, avoiding frequent manual cleaning of residues in the accommodating chamber 110 and significantly extending the cycle of manual cleaning of the reaction tank 100.

[0027] It is important to emphasize that the air duct 320 needs to be extended as close as possible to the bottom of the feed pipe 310 to allow more bubbles to be buffered in the air duct 320, thereby increasing the liquid level in the feed pipe 310. In existing equipment, the air duct 320 preferably extends to a position 15 cm to 22 cm from the bottom of the feed pipe 310.

[0028] In addition, in the prior art, a homogenizer is usually used to mix the neutralizer and the metal ion solution. However, the present invention introduces a high-flow metal ion solution into the first inlet pipe 210, and promotes the neutralizer to be fully dispersed in the metal ion solution through the high-speed fluid.

[0029] It's important to emphasize that this device was originally designed for the hydrometallurgical smelting of laterite nickel-iron ore. By setting appropriate reaction conditions, including pH, temperature, and pressure, it can react and precipitate a variety of metal ions, including iron, aluminum, nickel, cobalt, manganese, and zinc. In principle, any metal element that can react in a reaction vessel to form a solid precipitate is applicable.

[0030] In some preferred embodiments, there are multiple second inlet pipes 220, and the multiple second inlet pipes 220 are sequentially connected to the first inlet pipe 210 along the axis of the first inlet pipe 210. Utilizing multiple second inlet pipes 220, the neutralizer can be introduced into the metal ion solution in batches. Introducing the neutralizer into the metal ion solution in small amounts and multiple times can allow for more thorough mixing of the metal ion solution and the neutralizer.

[0031] In some preferred embodiments, the feed assembly 200 further includes a third inlet pipe 230, which communicates with the feed pipe 310. This third inlet pipe 230 allows for the addition of a portion of neutralizer to the feed pipe 310. Driven by the rising air within the feed pipe 310, the neutralizer rapidly mixes with the metal ion solution, causing any unprecipitated metal ions within the feed pipe 310 to react and precipitate quickly. Excess neutralizer in the feed pipe 310 does not alter the acidity or alkalinity of the metal ion solution within the accommodating chamber 110, thereby maintaining the reaction conditions within the accommodating chamber 110.

[0032] Based on the above embodiment, in some preferred embodiments, the third inlet pipe 230 is connected to the end of the material extraction pipe 310 close to the accommodating chamber 110. This can extend the distance that the neutralizing agent introduced from the third inlet pipe 230 travels in the material extraction pipe 310, thereby extending the reaction time of the metal ions.

[0033] In some preferred embodiments, the second introduction tube 220 partially extends into the first introduction tube 210, so that the neutralizer discharged from the second introduction tube 220 can reach the center of the first introduction tube 210 and then be quickly dispersed in the metal ion solution under the flushing of the metal ion solution.

[0034] In some preferred embodiments, the angle between the flow direction of the material in the first inlet pipe 210 and the flow direction of the material in the second inlet pipe 220 is an acute angle. Since the angle between the flow directions of the material in the first inlet pipe 210 and the second inlet pipe 220 is an acute angle, the kinetic energy loss of the metal ion solution can be minimized.

[0035] In some preferred embodiments, the material extraction pipe 310 includes a main pipe 311 and a secondary pipe 312. The main pipe 311 is vertically arranged and extends into the accommodating chamber 110. One end of the secondary pipe 312 is connected to the main pipe 311, and the other end of the secondary pipe 312 is tilted downward. When the air guide pipe 320 vents air into the main pipe 311, the material level in the main pipe 311 continuously rises until the material level reaches the junction of the secondary pipe 312 and the main pipe 311, allowing the material to be gradually discharged from the secondary pipe 312.

[0036] In some preferred embodiments, a shutoff valve 3121 is installed on the secondary pipe 312 to control the opening and closing of the secondary pipe 312. Similarly, a regulating valve 321 is installed on the air duct 320 to control the opening of the air duct 320. By adjusting the opening of the air duct 320 by regulating the regulating valve 321, the flow rate of gas introduced into the material lifting pipe 310 can be controlled.

[0037] In some preferred embodiments, the bottom surface of the reaction tank 100 is an inclined surface inclined toward the material extraction pipe 310. Under the guidance of the inclined surface, the sediment can be gathered near the material extraction pipe 310, so as to facilitate the discharge of the solid sediment.

[0038] In some preferred embodiments, the laterite nickel ore hydrometallurgical precipitation system further includes a stirring assembly 400, which includes blades 410, a rotating shaft 420, and a driving member 430. The rotating shaft 420 is rotatably mounted within the accommodating chamber 110, the blades 410 are mounted on the rotating shaft 420, and the driving member 430 is connected to the rotating shaft 420 to drive the rotating shaft 420 to rotate. The driving member 430 drives the rotating shaft 420 and the blades 410 to rotate, thereby stirring the metal ion solution to increase the reaction speed of the metal ions. In addition, the driving member 430 is preferably a motor, which is directly connected to the rotating shaft 420, thereby driving the rotating shaft 420 to rotate.

[0039] It should be emphasized that the second inlet pipe 220 and the third inlet pipe 230 are both used to introduce neutralizers. The operator can introduce neutralizers of different concentrations or even different types of neutralizers into the second inlet pipe 220 and the third inlet pipe 230 respectively according to the process conditions, so that the metal ions can react and precipitate more efficiently.

[0040] First, a metal ion solution is introduced into the receiving chamber 110 through the first inlet tube 210, and a neutralizer is introduced into the first inlet tube 210 through the second inlet tube 220. The neutralizer and metal ion solution mix and then enter the receiving chamber 110 together. As the pH of the metal ion solution and neutralizer increase after mixing, the metal ions precipitate as hydroxides, which accumulate at the bottom of the receiving chamber 110. The drive member 430 drives the rotating shaft 420 and blades 410 to rotate, thereby stirring the metal ion solution and increasing the reaction speed of the metal ions. The air duct 320 is used to ventilate the feed pipe 310. Due to the entrained bubbles in the solid-liquid mixture in the feed pipe 310, the overall density of the material in the feed pipe 310 is lower than that of the material in the receiving chamber 110. Atmospheric pressure causes the liquid level in the feed pipe 310 to rise, ultimately allowing the solid-liquid mixture at the bottom of the receiving chamber 110 to be discharged through the feed pipe 310. By using the laterite nickel ore wet smelting precipitation system provided by the present invention, the sediment at the bottom of the accommodating chamber 110 can be directly discharged, avoiding frequent manual cleaning of residues in the accommodating chamber 110 and significantly extending the cycle of manual cleaning of the reaction tank 100.

[0041] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A laterite nickel ore hydrometallurgical precipitation system, characterized in that: include: A reaction tank having a containing cavity therein; A feed assembly, comprising a first introduction pipe and a second introduction pipe, wherein the second introduction pipe is connected to the first introduction pipe, and the first introduction pipe is connected to the accommodating chamber; The outlet assembly includes a lifting pipe and an air guide pipe, one end of the lifting pipe is connected to the bottom of the accommodating chamber, and the air guide pipe extends below the liquid level in the lifting pipe and ventilates the lifting pipe to raise the liquid level in the lifting pipe and allow the material in the lifting pipe to be discharged from the port of the lifting pipe.

2. The laterite nickel ore hydrometallurgical precipitation system according to claim 1, characterized in that: The feed assembly further comprises a third introduction pipe, and the third introduction pipe is connected to the lifting pipe.

3. The laterite nickel ore hydrometallurgical precipitation system according to claim 2, characterized in that: The third introduction pipe is connected to one end of the material lifting pipe close to the accommodating chamber.

4. The laterite nickel ore hydrometallurgical precipitation system according to claim 1, characterized in that: The second introduction tube partially extends into the first introduction tube.

5. The laterite nickel ore hydrometallurgical precipitation system according to claim 4, characterized in that: The angle between the flow direction of the material in the first introduction pipe and the flow direction of the material in the second introduction pipe is an acute angle.

6. The laterite nickel ore hydrometallurgical precipitation system according to claim 1, characterized in that: The material lifting pipe includes a main pipe and a sub-pipe, the main pipe is vertically arranged and extends into the accommodating cavity, the air guide pipe extends into the main pipe, one end of the sub-pipe is connected to the main pipe, and the other end of the sub-pipe is inclined downward.

7. The laterite nickel ore hydrometallurgical precipitation system according to claim 6, characterized in that: A stop valve is installed on the secondary pipe, and the stop valve controls the on and off of the secondary pipe.

8. The laterite nickel ore hydrometallurgical precipitation system according to claim 1, characterized in that: The air duct is provided with a regulating valve, and the regulating valve controls the opening of the air duct.

9. The laterite nickel ore hydrometallurgical precipitation system according to claim 1, characterized in that: The laterite nickel ore wet smelting precipitation system also includes a stirring component, which includes blades, a rotating shaft and a driving member. The rotating shaft is rotatably installed in the accommodating cavity, the blades are installed on the rotating shaft, and the driving member is transmission-connected to the rotating shaft to drive the rotating shaft to rotate.

10. The laterite nickel ore hydrometallurgical precipitation system according to claim 9, characterized in that: The driving member includes a motor, and the motor is directly connected to the rotating shaft.

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