Hot metal spheroidizing treatment method

Abstract

The invention discloses a method for spheroidizing molten iron, which comprises adding 2.8-4.0% of carbon, 1.8-4.3% of silicon, 0.08-2% of manganese, and the balance of iron into a smelting furnace and heating at 1450-1620°C to obtain molten iron; In the molten iron ladle of the spheroidizing device, 100-120mm of glass is covered on the molten iron, and the amount of glass added is 0.6-0.9% of the total amount of molten iron; the spheroidization reaction is carried out; the feeding speed of the magnesium wire is 50-260m / min; Magnesium wire reacts with molten iron to make the molten iron roll, and at the same time, the glass on the molten iron melts to form a layer of slag floating on the surface of the molten iron; the total amount of magnesium wire feeding is 0.6-0.9% of the total amount of molten iron, and the wire feeding is completed, and the spheroidization is completed . The invention has the advantages of small amount of covering agent, uniform and consistent ductility on the surface of molten iron, good effect of isolating air, promoting full absorption of nodulizing agent to make nodularization uniform, regular spheroidized product particles, and low production cost.

Description

technical field [0001] The invention relates to chemical equipment, in particular to a method for spheroidizing molten iron. Background technique [0002] At present, in the metal smelting and pouring industry, molten iron needs to be poured into the ladle for spheroidization after melting; the traditional spheroidization generally adopts the flushing method, and a layer of rare earth silicon-iron-magnesium alloy is laid on the bottom of the ladle as a spheroidizer. Then the molten iron is poured into the ladle to act with the nodulizer, and at the same time, a layer of covering agent such as pig iron filings is laid on the upper part of the molten iron to prolong the oxidation time of the molten iron and gain sufficient time for the nodularization process. [0003] However, the above-mentioned traditional molten iron spheroidizing treatment method has the following disadvantages. Because the covering agent layer mostly adopts pig iron filings layer similar to the molten iro...

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned traditional molten iron spheroidizing treatment method has the following disadvantages. Because the covering agent layer mostly adopts pig iron filings layer similar to the molten iron composition, it is easy to fuse with the molten iron, and it cannot fully ensure that it is always on the upper part of the molten iron to isolate the air. The effect of delaying oxidation, and the ductility on the surface of molten iron is poor, and the thickness of the entire covering layer cannot be guaranteed to be uniform and consistent

Moreover, in order to make up for the above-mentioned insufficient ductility of the traditional pig iron filings covering agent layer, it is necessary to ensure that the entire covering agent is added in a very large amount, and the whole process must be continuously monitored and intermittently added covering agent to ensure that the covering agent is always on the molten iron. Covering, which will cause a serious waste of covering agent and difficulties in subsequent post-processing

In addition, since the molten iron spheroidization process mostly adopts the flushing method, the nodulizer is generally located at the bottom of the molten iron ladle. During the molten iron ladle process, under the impact of the molten iron, the nodulizer is displaced and cannot fully contact the molten iron; at the same time Due to the uneven coverage of the above-mentioned traditional covering agent on the surface of molten iron, the nodulizer is in contact with the air, resulting in the oxidation and consumption of magnesium; the above two factors cause the absorption rate of magnesium to decrease, resulting in poor nodularization effect, and the obtained product Particles are not round and have defects

[0004] In addition, the traditional method of spheroidizing molten iron is to place the spheroidizing agent in the reaction chamber of the spheroidizing device, and then inject the molten iron into the spheroidizing device to react with the spheroidizing agent; Therefore, it cannot be fully integrated with the spheroidizing agent, resulting in uneven spheroidization and poor spheroidizing effect.

Images