The role of iron and silicon in carbon and sulfur analyzers

Iron and silicon are several additives commonly used in electric arc furnaces of carbon and sulfur analyzers

1. Iron. When measuring cast iron and materials with high carbon content, sometimes only about 0.1g of the sample is weighed. In this case, the amount of heat emitted by combustion in the electric arc furnace is very small and cannot meet the temperature required for the test. In order to meet the requirements of the test, we often add an appropriate amount of pure iron (according to calculations, 1g of pure iron can release 7233J of heat after combustion), so that the heat can generally meet the combustion temperature of the electric arc furnace.

2. Silicon.

(1) Silicon is mainly used as a heat-generating agent in a carbon-sulfur analyzer. After 0.15g of silicon is burned, 0.3174g of silicon dioxide is generated, and the heat released is 4816.49g, which is equivalent to the combustion of 0.66g of pure iron to produce iron trioxide. The heat.

(2) The purity of silicon can reach over 99.999%, and there is almost no carbon and sulfur blanks, which is beneficial to the determination of low carbon and low sulfur.

(3) The product of silicon oxidation is an acidic oxide of silicon dioxide. Its density is lower than that of iron and oxides. It has a floating effect in the liquid phase, which is beneficial to the determination of sulfur.