In an electrolytic cell, the current from a class called graphite anode plate into the electrolyte electrolysis industry, the anode is made of plate shape, so called graphite anode plate, widely used in electroplating, wastewater treatment, industrial anti-corrosion equipment or special materials. In electrolysis industry, using graphite anode plate as the anode has a history of more than and 100 years, the metal anode is in recent decades, the research and application of metal anode in China late last century, only in 70s the technology related to the research and experiment of metal anode, anode on electrolysis industry, mainly through the silver (2%) (0.5%): low silver lead silver alloy, lead and silver tin antimony alloy, lead calcium alloy and lead silver alloy adding nucleating agents and several stages.
Compared with other materials of graphite anode plate has high temperature resistance, good electrical and thermal conductivity, easy machining, good chemical stability, acid and alkali resistance, low ash content; for electrolytic solution, preparation of chlorine, caustic soda, salt alkali electrolytic solution preparation; application such as graphite anode plate can be used as conductive anode electrolytic salt solution preparation of caustic soda. The graphite anode plate can be used as the conductive anode in electroplating industry, and it is an ideal material for electroplating. It can make the products with smooth, fine, wear resistance, corrosion resistance, high brightness, not easy to change color and so on.
Two, graphite cathode carbon plate
Carbon block made of high quality anthracite, coke and graphite. Cathode for aluminum electrolytic cell. The bottom of the electrolytic tank is also called a bottom carbon block. The characteristic cathode carbon block acts as a conductor and forms the dual role of the inner lining of the electrolytic cell. The production of aluminum electrolysis requires high temperature resistance. Corrosion resistance and good conductivity, good thermal conductivity, high mechanical strength, good thermal shock resistance and strong corrosion resistance. According to the quality requirements of the products, the raw materials and the process conditions, the cathode carbon blocks in China are classified into 3 categories: common cathode carbon block, semi graphite carbon block and graphite carbon block. The common cathode carbon block is made from anthracite calcined at 1250 to 1350 DEG C. Semi graphite carbon block is divided into two kinds according to the production process.
Which is a kind of high quality high temperature calcined anthracite or graphite fragments more even with all the bits of graphite as aggregate, green products after forming only after calcination (calcination temperature less than 1200 DEG C) is no longer in the graphite furnace heat treatment, the carbon block called semi graphite carbon block.
The utility model is characterized in that the coke is prepared by the use of more easily graphitized coke as raw material, and the heat treatment is carried out at the temperature of 1800 to 2000 DEG C after the raw product is calcined into the graphitization furnace.
The former has higher strength and hardness, and the latter has better conductivity and integrity. Graphite carbon block, with easy graphitization coke as raw material, its graphitization temperature should reach 2500 degrees celsius. The difference between the semi graphitic carbon block and the graphite carbon block is that the arrangement of the crystal lattice is different. It can be used to indicate the degree of graphitization degree. The lattice of graphite carbon block is basically in the order of the state, the resistivity is less than 15 ohm m, the graphitization degree of the semi graphite carbon block is low or only partial graphitization, the resistivity is from 15 to 45 Omega M. In the process of heat treatment temperature, the heat treatment temperature of the half graphite carbon block is about 2000 DEG C, and the graphitization temperature of Shi Mozhi carbon block is from 2500 to 2800. Common cathode carbon block, resistivity 50 ~ 60 Omega M. The graphitized cathode is the conductive material used in the cathode of aluminum electrolysis cell, which represents the development direction of electrolytic aluminum industry. With the technical progress and development of the electrolytic aluminum industry, the development of the electrolytic cell to the large capacity of 300KVA and above, requires higher cathode materials. The main advantage is to strengthen the graphitized cathode current, improve the current efficiency and yield of energy, and make the electrolysis groove more stable operation, stable operation effect is more obvious, more significantly improve the current efficiency, the use of the graphitized cathode unit of electrolytic aluminum production capacity increased by 10 - 15% tons of aluminum, saving more than 600KWh. Due to the obvious effect of energy saving and consumption reduction, the graphitized cathode aluminum reduction cell is one of the most important materials for the development of the electrolytic aluminum industry in china.
