CGM Online

 Anode paste is the predecessor of preparing anodes in electrolyzers in aluminum plants. In the 40 years before 1995, the anode paste was once the largest product in China's aluminum carbon products. After 2000, this product will gradually be replaced by anode carbon blocks. It is the product with the largest output among carbon products. The anode paste is a carbon paste made of petroleum coke and pitch coke as aggregates and coal tar pitch as a binder. It is used as anode material for continuous self-baking aluminum electrolytic cell. Because of its high content of binder (more than 24%), it is paste-like before the upper part of the electrolytic cell is sintered, so it is called anode paste. The prepared anode is not only capable of good electrical conductivity, but also resistant to high temperature and corrosion, and at the same time the price is low. The resistivity of the preliminary anode is 50-70 μΩ.m, plus the lead and contact resistance, during normal aluminum electrolys

 Electrode occupies an important position in submerged arc furnace. The working conditions of the electrode are bad, the current passing through is high, the temperature difference between the two ends is large, and the production is affected by the impact of mechanical, electrical and charge collapse... Mechanical strength, higher electrical resistivity, better thermal shock resistance, oxidation resistance and smaller thermal expansion coefficient. Generally speaking, the quality of electrode paste is controlled by the following five indicators: 1. Ash: Ash is the residue of electrode paste when it is burnt to constant weight at 850℃-870℃. It belongs to inorganic minerals. It has high ash resistivity, poor strength, high power consumption, and large electrode consumption. In the event of a hard breaking accident, the ash content is a very important indicator, and the lower the better. 2. Volatile matter: Volatile matter refers to the mass loss of electrode paste under the condition o

　　There are two pouring methods of pig iron: horizontal pouring and vertical pouring. 　　(1) Horizontal pouring method. Place the carbon block horizontally with the dovetail groove upward, and place a 15 mm thick phosphorus pig iron cushion block in the center of the groove. 50% clay and 50% carbon powder are used to make mud grid strips with diameter of 15 ~ 20 mm, which are placed on both sides of dovetail groove. A number of mud grid strips are placed in the dovetail groove, and the spacing is 150 ~ 170 mm. After drying, the carbon block and the steel bar are preheated in the flat bottom coke oven, and then poured with molten phosphorus pig iron, and the mud grid bar is used as a unit for subsection. The surface of ferrophosphate is covered with yellow sand; Cool, clean, check. 　　(2) Vertical pouring method. The cathode carbon block is placed vertically in the pit type heating furnace, phosphorus pig iron block is placed at the end of dovetail groove, and the steel bar is

 　　The cathode carbon block and cathode steel bar are closely combined into one process. Cathode carbon block is an important part of aluminum reduction cell, which is directly used as cathode lining and conductive material. The cathode circuit of aluminum reduction cell is formed by connecting cathode steel bar and cathode bus. The assembly process of cathode carbon block and cathode steel bar should reduce the contact resistance between them as much as possible. 　　There are three ways to assemble cathode carbon block and cathode steel bar( 1) Cast iron casting method. The gap between them is cast with molten phosphorus pig iron, which is condensed to form a whole( 2) In the carbon paste tamping method, the gap on both sides of the steel rod is filled with cathode paste called steel rod paste, and tamped and compacted with pneumatic tools( 3) Bonding method. The cathode carbon block and steel bar are bonded together with carbon glue or adhesive. Graphite or metal powder