Method for improving effective flowing of solution in electrolytic bath

Abstract

A method for improving effective flowing of a solution in an electrolytic bath is characterized in that a cavity for circulation of the solution is formed in an electrolytic bath body, the solution in the electrolytic bath continuously flows through the cavity, the solution is transferred at an inlet and an outlet of the cavity in the same electrolytic bath, and internal circulation mode flowing of the solution in the bath is achieved; a pipeline with an inlet and an outlet in the groove realizes the same effect of the cavity, and a device for conveying the solution to flow is arranged on the cavity or the pipeline to provide power for the solution to flow; according to the electrode structure composed of the multiple pieces of electrode materials, the planes of the multiple pieces of electrode materials are parallel to the internal circulation flowing direction of the solution or are arranged and fixed face to face in parallel at a certain included angle and a certain distance, and the flowing resistance of the solution is minimized. By means of the method, internal circulation of the solution in the electrolytic cell is achieved, the resistance of the cathode and the anode to solution flowing is reduced, the effectiveness of solution flowing in the electrolytic cell is improved, and the technological level and technical and economic indexes of the production process are further improved.

Description

Technical Field

[0001] The invention discloses a method for improving the effective flow of a solution in an electrolytic cell, and relates to a method for improving the effective flow of a solution in an electrolytic cell during the electrolytic production process control process. Background Art

[0002] At present, the solution circulation in the electrolytic cell in electrolytic production is realized by the solution entering and flowing out of the electrolytic cell. Generally, there are various changes such as top-in and bottom-out, bottom-in and top-out, but they are all changes in the way the solution enters and exits the electrolytic cell, including improved methods such as parallel flow, which are also changing the way the solution enters and exits the electrolytic cell. At the same time, the electrolytic cell is used in electrolytic production, and its space is not suitable for adding stirring equipment, and the mechanical equipment immersed in the solution is more easily damaged, which is not suitable for large-scale industrial applications. With the increasing technical level and the more complex problems faced by electrolytic production, improving the effective flow of the solution in the electrolytic cell is a problem that needs to be solved. Summary of the invention

[0003] The present invention aims at the problem of effective flow of solution in the electrolytic cell during the above-mentioned electrolytic production process. The present invention realizes internal circulation of solution in the electrolytic cell by improving the cell body structure of the electrolytic cell, reduces obstacles to solution flow by improving the anode and cathode structures, and provides a method for improving the effective flow of solution in the electrolytic cell.

[0004] A method for improving the effective flow of a solution in an electrolytic cell, characterized in that:

[0005] (1) A cavity for solution circulation is provided in the electrolytic cell body, and the solution in the electrolytic cell continuously flows through the cavity, so that the solution is always kept in the same electrolytic cell to achieve position transfer, thereby achieving continuous internal circulation mode flow of the solution in the cell, as shown in the schematic diagram Figure 1 As shown;

[0006] (2) The cavity in step (1) can also be replaced by a pipe with both inlet and outlet arranged in the tank, and a device for conveying the solution flow is provided on the cavity or the pipe to provide power for the solution flow, as shown in the schematic diagram. Figure 2 , Figure 3 As shown;

[0007] (3) The structure of the cathode or anode in the tank, the electrode is composed of multiple pieces of electrode materials, the planes of the multiple pieces of electrode materials are parallel to the circulation flow direction of the solution or are arranged and fixed face to face in parallel at a certain angle and a certain distance, so as to minimize the resistance to the flow of the solution, as shown in the schematic diagram Figure 3 , Figure 4 shown. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of setting a solution flow cavity in the tank body; Figure 2It is a schematic diagram of the structure of transporting the solution through the pipeline in the electrolytic cell; Figure 3 It is a schematic diagram of solution flow in the state of cathode and anode structure and cavity structure in the tank; Figure 4 It is a schematic diagram of a multi-piece electrode structure; Figure 5 This is a data table of Example 1; Figure 6 This is a data table of Example 2; Figure 7 This is the data table of Example 3. DETAILED DESCRIPTION

[0009] Embodiment 1

[0010] Experimental study on recovery of copper and cobalt from sulfuric acid leaching solution of low-grade copper-cobalt oxide ore

[0011] The experiment was carried out in a conventional electrolytic cell without an internal circulation structure, using grid-type anodes and cathodes.

[0012] The anode uses 2mm thick lead sheets to make anode structures with multiple sheets arranged, and the cathode uses 0.5mm thick titanium sheets to make cathode structures with multiple sheets arranged. The parameters of the anode and cathode are:

[0013] Lead sheet structure anode: 95mm wide, 150mm high, composed of 15 pieces of lead sheets with a width of 20mm, a length of 130mm and a thickness of 2mm, fixed with titanium screws.

[0014] Titanium sheet structure cathode: 100mm wide, 150mm high, composed of 20 pieces of titanium sheets with a width of 20mm, a length of 150mm, and a thickness of 0.5mm fixed with titanium screws.

[0015] Sulfuric acid leaching solution conditions: 2L solution, Cu2+: 10.16g / L; Co2+: 8.25g / L; pH: 0.5.

[0016] Electrolysis process:

[0017] (1) Prepare the experiment, place two anodes 100 mm apart, and place a cathode in the middle of the anodes;

[0018] (2) Room temperature 20°C, electrolysis current intensity 5.1A, copper and cobalt concentrations were tested every half hour, and the growth on the electrode surface was checked;

[0019] (3) When the copper grown on the electrode surface begins to slag off, record the copper-cobalt concentration;

[0020] (4) adjusting the pH of the solution to 0.5 with sodium hydroxide solution, and adding alkali solution to keep the pH of the solution stable while continuing electrolysis;

[0021] (5) Continue electrolysis. Metallic copper and cobalt begin to grow on the electrode surface. Detect the cobalt ion concentration every half an hour to observe the growth of cobalt on the electrode surface. When metallic cobalt grows on the copper surface, record the copper-cobalt concentration at that moment.

[0022] (6) When the product grown on the electrode surface is metallic cobalt powder, continue electrolysis for 1 hour and then stop electrolysis;

[0023] (7) Analyze the concentration of copper and cobalt ions in the solution after electrolysis, and calculate the recovery rate of copper and cobalt based on the concentration of copper and cobalt ions remaining in the solution.

[0024] Data Recording

[0025] During the experiment, samples were taken and titration analysis was performed in the laboratory. The results are shown in the attached manual. Figure 5 Table 1.

[0026] After completing step (7), 1.12 g / L of copper and 2.79 g / L of cobalt remained in the solution. According to the amount of metal in the remaining solution, the copper recovery rate reached 87.00% and the cobalt recovery rate reached 66.18%.

[0027] Embodiment 2

[0028] Use an electrolytic cell with an internal circulation structure: add a cavity for the solution to flow through on the right wall of the small test electrolytic cell, set a Φ5mm inlet every 50mm on the lower edge of the right wall, set a Φ5mm outlet every 50mm at the liquid level of the solution, and install a submersible delivery pump in the cavity to promote the internal circulation of the solution in the tank, with a circulation speed of 1.5L per minute.

[0029] Repeat the experiment under the same conditions as in Example 1.

[0030] Data Recording

[0031] During the experiment, samples were taken and titration analysis was performed in the laboratory. The results are shown in the attached manual. Figure 6 Table 2.

[0032] After completing step (7), 0.04 g / L of copper and 0.2 g / L of cobalt remain in the solution. Based on the amount of metal in the remaining solution, the recovery rate of copper reaches 99.6% and the recovery rate of cobalt reaches 97.58%.

[0033] Under the conditions of improved anode and cathode and solution-driven flow, very good technical indicators were achieved, which were much higher than the yield results of the chemical precipitation method, and the yields of copper and cobalt reached ideal levels.

[0034] Embodiment 3

[0035] In an electrolytic cell without an internal circulation device, a conventional integral lead sheet permanent anode and an integral sheet titanium cathode were used, and the test under the same conditions as in Example 1 was repeated.

[0036] Lead sheet anode: 95mm wide and 150mm high.

[0037] Titanium sheet cathode: 100mm wide and 150mm high.

[0038] Data Recording

[0039] During the experiment, samples were taken and titration analysis was performed in the laboratory. The results are shown in the attached manual. Figure 7 Table 3.

[0040] After completing step (7), 1.84 g / L of copper and 3.95 g / L of cobalt remained in the solution. Based on the amount of metal in the remaining solution, the copper recovery rate reached 81.89% and the cobalt recovery rate reached 52.12%.

[0041] When the conventional integral block anode and cathode were used for verification without circulating flow in the solution, the yields of copper and cobalt were lower.

Claims

1. A cavity for solution circulation is provided in the electrolytic cell body, and the solution in the electrolytic cell continuously flows through the cavity, completing the transfer of the solution between the inlet and outlet positions of the cavity in the same electrolytic cell, thereby realizing the internal circulation mode flow of the solution in the cell.

2. Arrange the pipes with inlet and outlet in the tank to achieve the same function as the cavity, and set the device for conveying the flow of solution on the cavity or pipe to provide power for the continuous flow of solution.

3. An electrode structure composed of multiple pieces of electrode materials, wherein the planes of the multiple pieces of electrode materials are parallel to the circulation flow direction in the solution or are arranged and fixed face to face in parallel at a certain angle and a certain distance, so as to minimize the resistance of the electrode to the flow of the solution.

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