• Follow us
Home > News > Content
High-temp Antioxidant Carbon Material Oxidation Theory
Jul 04, 2017

High-temp Antioxidant Carbon material oxidation theory

The graphite electrode is the key power part of the steelmaking electric arc furnace, which uses it to conduct current to provide energy for the charge and molten steel refining. In terms of controlling the total cost of EAF, the cost of graphite electrodes is one of the main factors considered. The loss of the graphite electrode can be divided into two types, namely, continuous loss and discontinuous loss. Continuous loss mainly refers to the oxidation, sublimation, corrosion and other effects caused by the loss; and damage, fracture and thermal shock peeling caused by the loss of non-continuous loss. With the analysis of the mechanism of graphite electrode loss, it can be seen that oxidation is one of the main reasons for the loss of graphite electrode, accounting for more than half of the graphite electrode consumption, so take effective measures to prevent the oxidation of graphite electrode, can significantly Reduce the consumption of graphite electrodes and the cost of steelmaking.

The oxidation of graphite electrode mainly occurs in the side wall of the graphite electrode. According to the oxidation theory of carbon material, the oxidation reaction of graphite electrode is divided into three different temperature zones. ****** and the second reaction temperature zone between about 500 ~ 1000 ℃, known as the low temperature oxidation zone, graphite electrode loss is only 2% of the total consumption, 1000 ℃ above the third reaction temperature zone, called For high temperature oxidation zone, high temperature oxidation loss is 20 ~ 50 times of low temperature oxidation loss. Therefore, to prevent the oxidation of graphite electrode should be the main study of high temperature oxidation area. ZS-1021 graphite high temperature oxidation coating is by Beijing Zhisheng Weihua Chemical Co., Ltd. based on the above theoretical basis for the development of graphite oxide loss of professional energy-saving coating. ZS-1021 graphite high temperature anti-oxidation coating temperature is high, the use of Beijing Zhisheng Weihua special high temperature solution, the temperature can reach 1800 ℃, can be a long time fire fire barbecue, the material used nano-ceramic scale structure, Glass phase state, good density, in the material surface oxidation decarburization layer, to prevent gas and material contact, hardness can reach 7-8H, have a good impact resistance wear resistance. ZS-1021 Zhisheng high temperature closed coating coating itself acid and alkali, high temperature, no volatile material at room temperature, inorganic water environmental protection, and quenching medium does not react, can effectively protect the material under high temperature chemical reaction oxidation Effectively prevent the graphite electrode, graphite crucible, graphite rods and other high-temperature oxidation rate of 96% or more. Some compounds are weak in the pure state and exhibit strong antioxidant activity in the mixed state. We believe that there is a positive synergistic effect between the components, usually referred to as synergistic effect. Synergistic effect is a common phenomenon between antioxidants, typical examples of VC and VE. In 1962, Tappel took the lead in the study of the synergistic effect between VE and VC, and proposed VC's view of VE reproduction, and this conclusion was confirmed by Paker and NiKi.

As the process of collaborative antioxidant is more complex, the current understanding of its mechanism is not very thorough, summed up the existing research work, collaborative antioxidant mainly in the following three:

1 regenerative antioxidants

Some antioxidants such as VC, coenzyme Q in addition to its own can directly act on the oxidation process can also be highly efficient antioxidant (mainly VE) exchange of electrons so that VE to maintain normal levels continue to play antioxidant. Such as VE and VC, in the inhibition of soybean phospholipid liposomes, fish oil, homogeneous system linoleic acid or methyl linoleate lipid peroxidation and other tests, Jianming products, it was found in the initial reaction VE concentration of basic Unchanged, and the concentration of VC has declined, until the VC completely consumed, VE concentration began to decline. It is speculated that VC can reduce the VE radicals to VE, thereby increasing the effective concentration of VE in the solution and enhancing the antioxidant capacity. At the same time, VC can decompose the hydroperoxides of the lipid compounds into non-free radical products. Show synergies.