1. Preparation process of titanium anode
- 1.1 Coating and firing
According to different application requirements, the halides of Ru, Ir, Sn, Ti, Pd, Ta, Co, Ni, etc. are formulated into alcohol solutions in different proportions → coating → drying → oxidation firing, and repeated many times to make The required anode → quality inspection → delivery.
- 1.2 Surface treatment of titanium substrate
In order to increase the effective area of the substrate and enhance the bonding force between the coating and the titanium substrate, usually 10% to 15% alkali or detergent powder is used to boil to remove oil, and then 10% to 15% oxalic acid is used to boil and etch.
2. The history of titanium anode
China started the metal anode cell research in 1972. The mercury cell passed the identification in Tianjin in 1974, and the 20 m2 metal anode cell in Shanghai in 1975. By the first half of 1987, Type 30 industrial cell It has reached more than 1,600 units, and its production capacity has accounted for 1/3 of the world, making China’s caustic soda production rank fifth in the world. By 1996, China’s caustic soda output reached 5.32 million tons, ranking third in the world. The output produced by metal anode electric cells has accounted for more than 80% of the total output.
The electrolytic industry has used graphite as an anode for 100 years. With the development of the industry, titanium anode companies believe that the limitations of graphite anodes such as high energy consumption and short life are exposed more and more. People always want to develop a more The ideal anode material is used instead. As early as 1901, the patent of platinum plating on Pb was published, and in 1909, the patent of platinum plating on graphite was published. In 1950, the Dutch Henry Bill first published articles on titanium-coated titanium-precious metal films a few weeks before DB Cotton and CH Angell of the British company Ici. The American Olin company began its laboratory in 1957 for industrial production Research and cooperated with Ici in 1960 to apply its research results to mercury electrolysis cells. Bill obtained the patent right of RuO2 coating anode in 1965. In 1968, the research results of Bill ’s RuO2-TiO2 coating were industrialized in the chlor-alkali plant of de Nora in Italy. This oxide-coated anode was called DSA (Dimensonally Stable Anode) commercially. 50% of the world’s chlor-alkali industry has replaced graphite anodes with DSA, and currently 70% of the cells have been changed to metal anode cells.
Titanium Anode Company learned about the advantages of DSA in the chlor-alkali industry (> 23%), high productivity, reduced maintenance costs, reduced labor intensity and obvious environmental benefits, which aroused the interest of other electrochemical workers. A large number of new anode coating materials and application development research have been carried out, and have been obtained in many fields such as water treatment, metal foil preparation, chlorate preparation, metal surface treatment, cathodic protection, electroplating, seawater decontamination, etc. application. Electrochemical and materials workers in China have also done a lot of work.