Titaanianodien käyttö vedenkäsittelykentällä
Electrochemical methods are very effective in treating refractory organic matter. It can convert non-biochemically degradable organic matter into biochemically degradable organic matter. The electrochemical conversion reaction rate of organic matter is generally slow, so it is often improved by increasing the overpotential of the electrode, increasing the electrode surface area, selecting excellent electrode materials, and improving the electrode structure. In electrochemical reactions, the electrode surface area is accompanied by a heterogeneous catalytic reaction as charges move, which is similar to chemical catalysis. In a certain electrolyte, under the same overpotential, the electrode reaction rate and reaction type change due to different electrode matrix materials. This is collectively called electrocatalysis in electrochemistry. In electrocatalytic reactions, as electrocatalysts, different electrode materials can change the electrochemical reaction rate by orders of magnitude. Therefore, selecting appropriate electrode materials is an effective way to improve the efficiency of electrochemical catalytic reactions.
In the field of water treatment, especially in the electrolysis process of water, such as the process of generating acid and alkali ionized water, there are various strong oxidizing substances in the water, such as: O3, H2O2, HCLO, etc., and the anode often reverses direction, so Special functional electrodes must be used. After years of research, our company has developed a long-life electrode suitable for the field of water treatment - titanium metal coated electrode. This kind of electrode is an insoluble anode coated with platinum group noble metal oxides with high electrocatalytic performance, strong oxidation resistance and good conductivity on a pure titanium substrate. The characteristics of this anode are:
1. Titanium has the characteristics of light specific gravity, good strength, corrosion resistance and good performance, especially its resistance to wet chlorine, which is unmatched by other metal materials. For example: when there is a trace amount of chloride ions in the electrolysis of water, the stainless steel plate will quickly undergo pitting corrosion, shortening the life of the electrode. However, titanium does not have these problems.
2. Due to the addition of a variety of platinum group precious metals in the coating, it has high current efficiency, good conductivity, good electrocatalytic performance, strong oxidation resistance, long working life, and energy saving.
3. It has good polarity reversal performance.
Titanium anode is a key component in the water electrolysis machine. The quality of the metal electrode directly affects the quality of the water purification machine. How to choose electrodes should be reasonably selected according to different working properties. In the field of water treatment, metal electrodes must have the following basic requirements:
1. Has good electrical conductivity.
2. Strong corrosion resistance.
3. Good mechanical strength and processing performance.
4. Long working life.
5. It has good electrocatalytic performance, etc.
Advantages and applications of various titanium anode plates
1. Ruthenium titanium anode plate
Product advantages: high current efficiency (chlorine evolution or oxygen evolution environment), excellent corrosion resistance, long service life of the electrode, the size of the electrode can be designed according to user needs, the electrode base can be reused many times, and does not pollute the medium. .
Application areas: chlor-alkali industry, sodium hypochlorite industry, sewage treatment industry, fresh water disinfection
2. Ruthenium iridium titanium anode plate
Product advantages: The size of the anode is stable, and the electrode spacing does not change during the electrolysis process, ensuring that the electrolysis operation is carried out under the condition of stable cell voltage. The working voltage is low, the power consumption is small, and the power consumption can be reduced by about 20%. Titanium anodes have a long working life. In the chlorine production industry using the diaphragm method, metal anodes are resistant to chlorine and alkali corrosion. It can overcome the dissolution problems of graphite anodes and lead anodes, avoid contamination of electrolytes and cathode products, and improve product quality. Can increase current density.
For example, in the production of chlor-alkali by the diaphragm method, the current density of the graphite electrode is 8A/M2, and the titanium anode can be doubled to 17A/M2. In this way, in the case of the same electrolysis plant and electrolytic cells, the output can be doubled. . It has strong corrosion resistance and can work in many electrolytic media that are highly corrosive and have special requirements. It can avoid the short circuit problem after the lead anode is deformed, thereby improving the current efficiency. The base titanium material can be used repeatedly.
Application areas: chlor-alkali industry, chlorine dioxide production, chlorate industry, hypochlorite industry, perchlorate production, hospital sewage treatment, persulfate production, food utensil disinfection, ionized water production
3. Tantalum iridium titanium anode plate
Product advantages: Metals are extracted electrolytically in sulfuric acid solution, and oxygen is precipitated on the anode. Choosing the appropriate anode material is a very important issue. It adopts tantalum-iridium series coated titanium electrode, which has low oxygen overpotential and is not corroded by electrolyte. Iridium oxide coating shows excellent electrolytic durability. The initial anode potential is 1.51V. After 6000 hours, it is 1.64V. The coating weight loss is 0mg/M2.
When lead-based alloy electrodes (containing Sb 6% to 15%, or Ag 1%) are used in electrolysis production, the lead anode will dissolve, consuming the anode material, affecting the service life of the anode, and the lead dissolved in the solution will remain on the cathode. Precipitation increases lead impurities in the metal and reduces product quality. Ruthenium-based coatings will be severely damaged under this working condition and should not be used. The initial anode potential is 1.48V. After 1000 hours, it rises to 2.0V, and the anode has been passivated.
Application fields: electrolytic production of non-ferrous metals, sterilization of food utensils, electrolytic silver catalyst production, wool spinning mill dyeing and finishing wastewater treatment, electrolytic manufacturing of copper foil, steel plate galvanizing, chromium plating, electrolytic oxidation method for mercury recovery, rhodium plating, palladium plating, gold plating, Water electrolysis, molten salt electrolysis, battery production, cathode protection, ionized water production, printed circuit boards,
4. Iridium tin titanium anode plate
Product advantages: high current efficiency (in chlorine evolution or oxygen evolution environment), excellent corrosion resistance, long service life of the electrode, the size of the electrode can be designed according to user needs, the electrode base can be reused multiple times, and it is good for the medium. No pollution.
Application areas: chlor-alkali industry, aluminum foil, copper foil industry, industrial sewage treatment, ionized water production, organic electrochemical treatment and organic electrochemical synthesis, electrolytic purification of gases, seawater desalination, oxidant regeneration cycle.
