An electrolytic cell device for enhanced life testing of titanium-based electrodes

Abstract

The present invention discloses an electrolytic cell device for enhanced life testing of titanium-based electrodes. The electrolytic cell device is composed of a conductive wire through hole, an O-ring, a cathode slot, a wire connection, a rod-shaped bolt, a liquid inlet, an anode flange, an anode slot, a conical electro-liquid area, a liquid outlet, and an exhaust port. This device is provided with two areas, namely a cathode area and an anode area. The cathode slot only holds the cathode plate and is a square area, while the anode area is composed of a conical electro-liquid area, an anode slot, a liquid inlet, a liquid outlet, and an exhaust port, forming a conical reaction tank. Both the anode area and the cathode area are provided with conductive wire through holes, which facilitate the series connection of wires between two adjacent electrolytic cells. In addition, both the anode plate and the cathode plate rely on bolts, O-rings, and anode flanges to ensure that the electrolyte is not easily leaked. The present invention has a reasonable design, a simple structure, and high safety. It is a fully enclosed electrolytic cell device that can be quickly disassembled for continuous testing of enhanced life. It is an ideal auxiliary equipment for testing electrode life in the titanium-based electrode industry.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing equipment for strengthening life testing of electrodes in the electrochemical industry, in particular to an electrolytic cell device for testing the strengthening life of titanium-based coating electrodes. Background Art

[0002] Titanium-based anodes are widely used in industries related to solutions, such as the chlor-alkali industry, hypochlorite, persulfate, electrolytic water treatment, industrial water treatment, hydrometallurgy, aluminum and copper foil manufacturing, steel galvanizing, cathodic protection, seawater desalination, and electroplating. The life of titanium-based electrodes is directly related to the titanium-based anode manufacturing process, coating formula, and coating thickness. However, each different anode requires different testing methods and experimental equipment. In the electrode electrochemical industry, in order to test the service life of a certain electrode, by increasing the current density by multiples and conducting the electrochemical reaction of the electrode in a corresponding electro-liquid system environment through simple experimental equipment, such as in a beaker container, rectangular tank, and other reactors, the service life of the coated electrode is predicted, providing reliable data for anode performance.

[0003] Domestic electrode expert Zhang Zhaoxian once suggested that the conditions for the enhanced life test of titanium-based coated electrodes be unified and standardized. Scholars from various countries use different electrolytic conditions when conducting enhanced life tests. Commonly used electrolytes include: NaSO4, HClO4, and H2SO4. After multiple experiments and standardization, the final recommended electrolyte composition is H2SO4 and the temperature is 45-60°C. The current density is determined by the different chlorine and oxygen evolution electrodes. The chlorine evolution electrode is 1-2A / cm 2 , oxygen evolution electrode is 3-6A / cm 2 This enhanced lifespan test is a lengthy and open-ended process, subjecting it to significant acid gas corrosion, which poses significant risks to the testing environment, power supply equipment, and electrode leads. Furthermore, static corrosion from the solution within the existing system environment restricts electrode lifespan when testing electrode coatings per unit area. To improve the accuracy and safety of electrode coating lifespan testing, a device suitable for long-term testing of coated electrodes is essential. Summary of the Invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides an electrolytic cell device with simple process, high safety, rapid disassembly, full enclosed continuous testing and enhanced life test of electrodes.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: it includes an anode area and a cathode area, an O-ring is arranged between the anode area and the cathode area, a cathode slot for installing the cathode and a rod-shaped bolt for fixing the cathode are provided on the cathode area, a wire connection hole is provided on the outside of the cathode slot, an anode slot for installing the anode and an anode flange for fixing the anode are provided on the anode area, and conductive wire through holes for connecting the cathode and anode are also provided on the cathode and anode areas, and a liquid inlet, a liquid outlet and an exhaust port are respectively provided on the conical electro-hydraulic area between the cathode and the anode.

[0006] The conductive wire through holes are all designed in the cathode and anode slots.

[0007] The cathode region and the anode region are made of acid and alkali resistant high-density polyethylene (HDPE), high-performance polypropylene (PPH), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), glass fiber reinforced plastic (FRP) or organic glass (PMMA).

[0008] The conical electro-hydraulic area and the anode area are connected in an integral sealed manner.

[0009] The anode is a titanium-based manganese dioxide electrode (Ti / MnO2), a titanium-based lead dioxide electrode (Ti / PbO2), a ruthenium-titanium electrode of a metal oxide-coated chlorine / oxygen evolution electrode, a ruthenium-iridium-titanium electrode, an iridium-tantalum-titanium electrode, an iridium-tantalum-cobalt electrode, an iridium-tantalum-platinum electrode, an iridium-tantalum-tin electrode, a lead and lead alloy electrode, a lead-titanium alloy electrode, or a platinum and platinum-titanium electrode.

[0010] The cathode is made of titanium plate, stainless steel plate, lead plate, aluminum plate or nickel plate.

[0011] Compared with existing technologies, the present invention has the following advantages: the device is simple and uses a solution circulation method to cool the reaction heat of the electrolytic cell by circulating the solution; the fully sealed electrolysis reaction mode also helps to improve the exhaust of waste acid gas during the life enhancement, avoids corrosion of electrode equipment and environmental pollution, and effectively improves the efficiency of the life enhancement work and the predicted value of electrode life testing. After replacing the new electrode, the test phase can be quickly entered without the need for solution preparation. The test can be interrupted and switched between at any time, which is convenient for the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a device for testing the life of titanium electrodes;

[0013] Figure 2 Strengthen the life test process for the entire titanium electrode. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings.

[0015] See also Figure 1 The present invention includes an anode region and a cathode region, wherein an O-type sealing ring (2) is provided between the anode region and the cathode region, a cathode slot (3) for installing a cathode and a rod-shaped bolt (5) for fixing the cathode are provided on the cathode region, a wire connection hole (4) is provided on the outside of the cathode slot (3), an anode slot (8) for installing an anode and an anode flange (7) for fixing the anode are provided on the anode region, and a conductive wire through hole (1) for passing a conductive wire and connecting to the cathode and anode is provided on the cathode and anode slot bodies of the cathode and anode regions, thereby facilitating the wire to always be in a closed state, preventing the wire from being corroded and extending its service life. A liquid inlet (6), a liquid outlet (10) and an exhaust port (11) are provided on the conical electro-hydraulic region (9) between the cathode and the anode, respectively, and the conical electro-hydraulic region (9) and the anode region are integrally sealed and connected.

[0016] The cathode and anode regions of the present invention are made of acid- and alkali-resistant high-density polyethylene (HDPE), high-performance polypropylene (PPH), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), glass fiber reinforced plastic (FRP) or organic glass (PMMA); the anode is a titanium-based manganese dioxide electrode (Ti / MnO2), a titanium-based lead dioxide electrode (Ti / PbO2), a ruthenium-titanium electrode with a metal oxide coating for chlorine / oxygen evolution, a ruthenium-iridium-titanium electrode, an iridium-tantalum-titanium electrode, an iridium-tantalum-cobalt electrode, an iridium-tantalum-platinum electrode, an iridium-tantalum-tin electrode, a lead and lead alloy electrode, a lead-titanium alloy electrode or a platinum and platinum-titanium electrode; and the cathode is made of a titanium plate, a stainless steel plate, a lead plate, an aluminum plate or a nickel plate.

[0017] The present invention has two regions, namely a cathode region and an anode region. The cathode slot (3) only accommodates the cathode plate and is a square region. The anode region is composed of a conical electro-liquid region (9), an anode slot (8), a liquid inlet (6), a liquid outlet (10), and an exhaust port (11), forming a conical reaction tank. Both the anode region and the cathode region are provided with conductive wire through holes (1) to facilitate the series connection between two adjacent electrolytic cell devices. In addition, the anode plate and the cathode plate are both secured by bolts (5), O-rings (2), and anode flanges (7) to ensure that the electrolyte is not easily leaked.

[0018] The electrolyte circulation mode is bottom-in and top-out, that is, it enters the conical electro-hydraulic area (9) through the liquid inlet (6) and flows out to the waste liquid tank from the liquid outlet (10). The waste acid gas generated in the electrolyte process enters the acid mist absorption device through the exhaust port (11).

[0019] like Figure 2As shown in the figure, through the mature titanium-based electrode preparation process, various series of titanium-based electrodes have been prepared, including titanium-based manganese dioxide electrode (Ti / MnO2), titanium-based lead dioxide electrode (Ti / PbO2), metal oxide coated chlorine / oxygen evolution electrodes (ruthenium titanium (RuTi) electrode, ruthenium iridium titanium (RuIrTi) electrode, iridium tantalum titanium (RuTaTi) electrode, iridium tantalum cobalt (IrTaCo) electrode, iridium tantalum platinum (IrTaPt) electrode, iridium tantalum tin (IrTaSn) electrode, etc.), lead (Pb) and lead alloy (Pb / Me) electrode, lead titanium (PbTi) alloy electrode, platinum (Pt) and platinum titanium (PtTi) electrode, etc. For the above detectable electrodes, sample specifications of various electrodes that need to be tested are prepared, and then the sample electrode surface is cleaned and edge-grinded. The treated samples are placed in the electrolysis reaction device for electrode life testing. The waste acid gas generated in the electrolyte process enters the acid mist absorption device through the exhaust port. The electrolytic waste liquid is filtered and re-injected into the high-level solution circulation tank by a circulation pump. At the same time, the chemical electrolyte can be prepared and adjusted in the tank, such as pH, H2SO4 concentration, and additive content (fluorine, chlorine). The waste liquid mud is dried to obtain the filter residue, which can be reused in the preparation process of titanium-based electrode anodes through the valuable metal recovery process. In the enhanced life electrolysis process, the entire system solution is in a circulating state, which is conducive to cooling the reaction heat and increasing the service life of the experimental device. When the conical electrolyte area in the electrolysis device contains impurities, it can be treated by reverse cleaning with reverse water flow, which can quickly, safely and conveniently test the electrode life performance.

[0020] Example 1:

[0021] The electrolytic cell tested the chlorine evolution anode: a ruthenium titanium (RuTi) electrode sample, 30×30×2mm in size, with a single-layer coating. The coating formula is: 1-2g of RuCl3; 5-10ml of Ti(RuO)4; 1-2ml of HCl; and 13-20ml of n-butanol. The TiO2·RuO2-coated titanium electrode was prepared by thermal decomposition at 450-600°C. The enhanced life test conditions were: electrolyte concentration 1mol / L H2SO4, current density 2A / cm 2 , temperature 50℃, titanium electrode life is 25h.

[0022] Example 2

[0023] The electrolytic cell tested the chlorine anode: a ruthenium tin titanium (RuSnTi) electrode sample, measuring 40×40×2mm, with a single-layer coating. The coating formula was: RuO2 40%; SnO2 15%; TiO2 45%; 1-2ml HCl, 1.3ml n-butanol. The TiO2·SnO2·RuO2-coated titanium electrode was prepared by thermal decomposition at 550°C. The enhanced life test conditions were: electrolyte concentration 1mol / L H2SO4, current density 2A / cm2 , temperature 40-50℃, titanium electrode life is 8.2h.

[0024] Example 3

[0025] The oxygen evolution anode tested in this electrolytic cell is an iridium-tantalum-titanium (IrTaTi) electrode sample, measuring 60×60×2mm. It is a single-layer coated electrode with the following coating formula: 15mg TaCl5; 20mg IrCl3; 45% TiO2; 1-2ml HCl, 1.3ml n-butanol. The TiO2·SnO2·RuO2-coated titanium electrode is produced by thermal decomposition at 550°C. The enhanced life test conditions are: electrolyte concentration 1mol / L H2SO4, current density 2A / cm 2 , temperature 40-50℃, titanium electrode life is 8.2h.

[0026] Example 4

[0027] The oxygen evolution anode tested in this electrolytic cell is a titanium-based lead dioxide electrode (Ti / PbO2) electrode sample with dimensions of 80×80×5mm, a single-layer coated electrode, and a titanium-plated lead electrode. The enhanced life test conditions are: electrolyte concentration 1mol / L H2SO4, current density 2A / cm 2 , temperature 40-50℃, titanium electrode life is 30h.

[0028] Example 5

[0029] The electrolytic cell tested oxygen evolution anodes: platinum titanium (PtTi) electrode samples, 30 × 30 × 2 mm in size, single-layer coated electrodes. The coating formula: H2PtCl4 1.0-3.0g; IrCl3 0.3-0.7g; HCl 1-2ml; ethanol 13-20ml. After thermal decomposition at 580°C, the Ti / Pt-coated titanium electrode was prepared. The enhanced life test conditions were: electrolyte concentration 1mol / L H2SO4, current density 4A / cm 2 , temperature 40-50℃, titanium electrode life is 15.8h.

Claims

1. An electrolytic cell device for strengthening life testing of titanium-based electrodes, characterized by: The invention comprises an anode region and a cathode region, wherein an O-type sealing ring (2) is provided between the anode region and the cathode region, a cathode clamping slot (3) for mounting a cathode and a rod-shaped bolt (5) for fixing the cathode are provided on the cathode region, a wire connection hole (4) is provided on the outside of the cathode clamping slot (3), an anode clamping slot (8) for mounting an anode and an anode flange (7) for fixing the anode are provided on the anode region, and conductive wire through holes (1) for passing conductive wires and connected to the cathode and anode are provided on the cathode and anode regions, and a liquid inlet (6), a liquid outlet (10) and an exhaust port (11) are provided on the conical electro-hydraulic region (9) between the cathode and the anode respectively; The conductive wire through holes (1) are all designed in the cathode and anode slots, which facilitates the series connection between two adjacent electrolytic cell devices; the conical electro-liquid area (9) is integrally sealed and connected to the anode area; The electrolyte circulation mode is bottom-in and top-out, that is, it enters the conical electro-hydraulic area (9) through the liquid inlet (6) and flows out to the waste liquid tank from the liquid outlet (10). The waste acid gas generated during the electrolyte process enters the acid mist absorption device through the exhaust port (11); The cathode and anode regions are made of acid- and alkali-resistant high-density polyethylene (HDPE), high-performance polypropylene (PPH), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), glass fiber reinforced plastic (FRP) or organic glass (PMMA); The anode is a titanium-based manganese dioxide electrode (Ti / MnO2), a titanium-based lead dioxide electrode (Ti / PbO2), a ruthenium-titanium electrode of a metal oxide-coated chlorine / oxygen evolution electrode, a ruthenium-iridium-titanium electrode, an iridium-tantalum-titanium electrode, an iridium-tantalum-cobalt electrode, an iridium-tantalum-platinum electrode, an iridium-tantalum-tin electrode, a lead and lead alloy electrode, a lead-titanium alloy electrode, or a platinum and platinum-titanium electrode; The cathode is made of titanium plate, stainless steel plate, lead plate, aluminum plate or nickel plate.

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