Method for stirring solution in tank

Abstract

The invention relates to a method for stirring a solution in a tank, which comprises the following steps of: rotating a propeller-type stirring paddle at a high speed of not less than 10 revolutions per second to form rapid spiral flow of a local solution in the axial direction of the stirring paddle, forming micro negative pressure in a rapid flowing area of the solution, and introducing a reagent required by a reaction into the micro negative pressure area, the reagent is uniformly dispersed in the rapidly and spirally flowing solution to form an ideal reaction condition, and meanwhile, the rapidly and spirally flowing solution drives the surrounding solution to disorderly flow, impact and diffuse in the tank, so that the uniform mixing of the solution is rapidly realized; power for driving the stirring paddle to rotate can be selected from conventional power devices such as a pneumatic motor, a submerged motor, a gear and a chain transmission device, so that a solution can be quickly and uniformly mixed as a target, and the direction of a central shaft of the stirring paddle can be in any direction in the solution.

Description

Technical Field

[0001] The invention discloses a method for stirring a solution in a tank, and relates to a method for stirring a solution in a tank in chemical and hydrometallurgical industrial production. Background Art

[0002] At present, in the industrialized chemical and hydrometallurgical production, the tanks used as solution reaction containers are equipped with a large internal stirring device to stir the solution as a whole. The stirring often makes the solution in a relatively stable state as a whole, which is not conducive to the rapid formation of uniform mixing between the newly added reagents and the solution body. The products formed by local overreaction are difficult to reshape into ideal products, resulting in unsatisfactory reaction results, slow reaction process, and difficult control of process conditions. In addition, the stirring device used to achieve the stirring goal has a large structure, high equipment cost, high energy consumption, and difficulty in maintenance, which makes it difficult to further improve the reaction efficiency. With the increasing level of production technology in today's society, the problems faced by chemical and hydrometallurgical industrial production are becoming more complex. Improving the stirring method of the solution in the tank to achieve more efficient mixing is a problem that needs to be solved. Summary of the invention

[0003] Step 1: The propeller-style stirring paddle rotates at a high speed of not less than 10 rpm, forming a rapid spiral flow of the local solution in the axial direction of the stirring paddle, forming a slight negative pressure in the rapid flow area of ​​the solution, and introducing the reagents required for the reaction into the slight negative pressure area. The reagents are evenly dispersed in the rapid spiral flow solution to form ideal reaction conditions. At the same time, the rapid spiral flow solution drives the surrounding solutions to flow, collide, and diffuse in the tank in a chaotic manner, quickly achieving uniform mixing of the solutions, such as Figure 1 As shown in the schematic diagram;

[0004] Step 2: The power to drive the stirring paddle can be selected from conventional power devices such as pneumatic motors, submerged motors, gears, chain drives, etc. The central axis of the stirring paddle can be in any direction in the solution, as shown in the figure. Figure 2 , Figure 3 shown. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 This is a schematic diagram of the propeller-style stirring paddle rotating to drive the solution flow and diffusion. Figure 2 It is a schematic diagram of the structure of a propeller-type stirring paddle installed in the tank. Figure 3 It is a schematic diagram of a propeller-type stirring paddle structure configured in a tank body.

[0006] Contents indicated by the reference numerals:

[0007] 1- Propeller;

[0008] 2-paddles;

[0009] 3- propeller shaft centerline;

[0010] 4-reagent pipeline leading to the negative pressure area where the solution flows;

[0011] 5-Solution spiral flow direction;

[0012] 6-The reagent diffuses rapidly in the spiral flow solution;

[0013] 7-tank for solution reaction;

[0014] 8-The area inside the tank where the propeller is located. DETAILED DESCRIPTION

[0015] Embodiment 1

[0016] Iron removal from cobalt leaching solution in sulfuric acid system using yellow sodium iron vanadium process

[0017] Reaction tank: Φ2000*3500mm

[0018] Stirring paddle: 5-blade paddle with a diameter of 300 mm, driven by an air motor

[0019] The stirring paddle is in the center of the solution, the paddle shaft is placed horizontally, and the sodium carbonate solution outlet is set at the front end of the shaft. The sodium carbonate saturated solution at room temperature has a concentration of about 300g / L

[0020] The liquid level was 2500 mm, the reaction temperature was 95°C, the stirring paddle speed was 12 rpm, the solution was in a tumbling state, and the sodium carbonate solution inlet speed was 0.6 L / s.

[0021] During the reaction, the pH change of the solution was monitored online. When the pH of the solution rose to 2.5, the feeding rate of the sodium carbonate solution was adjusted to 0.2 L / s. When the pH of the solution rose to 2.8, the feeding rate of the sodium carbonate solution was adjusted to 0.1 L / s. When the pH of the solution rose to 3.5, the feeding of the sodium carbonate solution was stopped, the stirring paddle was kept rotating for 15 minutes, and the solution was filtered.

[0022] Product: 310 kg of yellow sodium iron vanadium slag, the slag contains 0.08% cobalt, which is much lower than the average result of 0.3% in conventional process.

[0023] Embodiment 2

[0024] Electrolytic recovery of copper and cobalt in an insoluble anode sulfuric acid system

[0025] Electrolytic cell: 3500*1200*1600mm.

[0026] Stirring paddle: 3-blade paddle with a diameter of 200 mm, driven by a submerged DC motor.

[0027] The stirring paddle is located in the middle of one end of the tank bottom, and the paddle shaft is placed horizontally toward the other end of the electrolytic tank. The sodium hydroxide solution outlet is set at the front end of the shaft. The sodium hydroxide solution has a concentration of 200g / L at room temperature.

[0028] Anode: Anode plate 1100*960mm with hole 2*2mm and lead bar diameter 5mm.

[0029] Cathode: 2mm diameter titanium wire, woven titanium mesh cathode.

[0030] Sulfuric acid leaching solution: Cu 2+ :8.2g / L;Co 2+ :7.9g / L;pH:0.5.

[0031] The room temperature is 25°C, the stirring blade speed is 10 rpm, the sodium hydroxide solution inlet speed is controlled at 0.1 L / min in the initial stage, the solution pH is controlled to remain stable at 0.5, the inlet speed is gradually reduced, and the solution pH no longer changes when no sodium hydroxide is added, and the electrolysis is stopped.

[0032] Product: Copper-cobalt mixed slag, the total copper and cobalt content is greater than 92%, which is higher than the average level of 76% under conventional alkali addition process conditions, and reduces the content of copper-cobalt salt hydrolysis products in the slag.

Claims

1. A method for stirring a solution in a tank, characterized in that: The propeller-style stirring paddle rotates at a high speed of not less than 10 rpm, forming a rapid spiral flow of the local solution in the axial direction of the stirring paddle, forming a slight negative pressure in the rapid flow area of ​​the solution, and introducing the reagents required for the reaction into the slight negative pressure area. The reagents are evenly dispersed in the rapid spiral flow solution to form ideal reaction conditions. At the same time, the rapid spiral flow solution drives the surrounding solutions to flow, collide, and diffuse chaotically in the tank, quickly achieving uniform mixing of the solutions. A method for stirring a solution in a tank, characterized in that: The power for driving the stirring paddle to rotate can be selected from conventional power devices such as pneumatic motors, submerged motors, gears, chain drives, etc., and the central axis direction of the stirring paddle can be in any direction in the solution.

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