The performance of slag removal agents can be judged by the following points:
The performance advantages and disadvantages of slag agents are reflected in several aspects such as slag removal effect, usage, dosage, and iron loss:
1. The slag remover placed in the ladle should have a certain viscosity, be able to gather slag into piles, have a certain strength, facilitate the removal or extraction of slag at once, save slag removal time (about 12 seconds), reduce electrical energy loss (electric furnace) and temperature drop (blast furnace ladle)
2. Easy to use, no need to deliberately spread evenly
3. Usage: The current minimum usage is 2 to 3 kilograms of slag remover per ton of molten iron;
4. Wrapping iron loss: The more molten iron is stripped out with slag, the more loss it will have. A good slag remover can keep iron loss at around 1 kilogram per ton of molten iron processed
5. Quick response, with a certain degree of expansion, quick projection, and no need for strenuous stirring
6. Does not contain substances that alter the composition of molten iron, to avoid affecting the properties of cast iron
7. The slag remover does not raise dust, improves the working environment, does not contain toxic substances, and reduces the risk of occupational diseases for workers.
8. After cooling, iron slag becomes brittle, making it easy to recover the trapped iron.
The slag remover has good slag capturing performance.
An active material that can expand and form a viscous porous structure under high temperature when sprinkled on the surface of liquid metal. It can adsorb impurities in molten metal and form a thin shell, which plays a role in slag collection and removal. Beneficial for purifying molten steel, iron, etc., and improving the quality of castings.
Slag remover is mainly used for melting cast steel, cast iron, alloy steel, special steel, and non-ferrous castings. Slag removal is an important process operation in the refining process. The use of efficient slag removal agents in ladle, crucible furnace, reflector furnace, and electric furnace can quickly aggregate slag into a slag shell that is easy to separate from the metal melt, making it convenient and clean to remove slag and ensure the cleanliness of the melt.
Product functions and features
1. Low dosage, strong slag aggregation ability, easy to crust and remove;
2. Slag is brittle and non stick; Improve the service life of furnace lining;
3. Light specific gravity, high coefficient of expansion, good insulation performance, and minimal temperature drop when handling molten metal;
4. Effectively covering the surface of the molten metal and reducing the oxidation of alloy elements during melting;
5. Not changing the metal composition, not polluting the metal liquid;
6. When used, it is smoke-free and dust-free, maintaining a clean workshop production environment.
Many domestic manufacturers'' slag removal agents, including white, brown, black, and others that have undergone dyeing treatment, are not used very well.
One is that the agglomeration of slag is too poor.
The second issue is that the expandability of domestic slag removal agents is too poor.
Thirdly, under the premise of the same usage amount, the usability of domestic slag removal agents is not satisfactory.
Fourthly, the amount of dust generated by domestic slag removal agents is much greater than that of Japanese slag removal agents.
The reason lies in the expansion mechanism of perlite: The main reason why perlite can expand under certain temperature conditions is different from other rocks is due to two fundamental reasons. Firstly, there are glassy substances with low softening points in the main chemical composition of perlite, such as SiO2, Al2O3, Na2O, etc. The result of these substances is that when perlite is heated to around 1000 ℃, its glassy material begins to soften, and perlite particles gradually transform from solid to viscous state. The second is that the volatile substances and bound water contained inside perlite gradually vaporize and overflow after being subjected to high-temperature roasting.
So, glass quality is a prerequisite for causing perlite expansion, combined with water as the internal driving force for perlite expansion, and calcination temperature and time are necessary external conditions for causing perlite expansion.
The main factors affecting the expansion effect of perlite are as follows: 1. Chemical composition: (1) SiO2 and Al2O3: they are the main chemical components that cause perlite to soften rapidly at high temperatures and maintain a certain viscosity at high temperatures. (2) Na2O/K2O: An increase in this ratio can lead to a decrease in the viscosity of perlite at high temperatures, resulting in a decrease in the softening point of perlite. (3) Fe2O3+FeO: An increase in its content will lead to a decrease in the expansion ratio of perlite.