A method of microalloying in iron and steel materials based on carbon carrier adsorption of rare earth elements

Abstract

The invention relates to a method for micro-alloying iron and steel materials based on carbon carrier adsorption of rare earth elements. Soluble rare earth salts are selected and dissolved to prepare rare earth salt solutions. The rare earth elements in the solution are adsorbed and fixed by carbon carriers to form The rare earth compound of the carrier is mixed with a deoxidizer to make a compact or a long cored wire. During the microalloying process, it undergoes a reduction reaction with the deoxidizer to reduce the rare earth elements and dissolve them into molten steel. , to complete the microalloying process of rare earth in iron and steel materials. The production process of the method is safe, the material source is simple and easy to obtain, the industrial production is easy to carry out, and the method is energy-saving and environment-friendly. The amount of rare earth microalloying in the obtained steel material is high, which can reach 10-100ppm, the yield of rare earth elements is high, the uniformity is good, and the remaining rare earth solution after the adsorption is completed can be reused, the resource allocation and utilization are efficient and reasonable, and have good application prospects.

Description

technical field [0001] The invention relates to a method for microalloying iron and steel materials based on carbon carrier adsorption of rare earth elements, and belongs to the technical field of material preparation. Background technique [0002] Rare earth is a characteristic resource in Baotou, Inner Mongolia. Baotou Iron and Steel Group has placed high hopes on the efficient use of rare earth in steel materials for many years. In particular, a lot of exploration and practice have been carried out on the method of adding rare earths. As early as the 1970s, rare earth metals were added in the steelmaking furnace or during the tapping of molten steel. However, due to the high chemical activity of rare earth elements, this addition method made the rare earth metals quickly react with oxygen, sulfur, etc. in the steel. Reaction occurs to generate oxides or sulfur oxides to float up and create slag, resulting in low yield of rare earth elements, poor uniformity in molten ste...

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Problems solved by technology

However, the problem with this method is that after the addition of rare earth elements, the main reaction involving rare earth elements is still an oxidation reaction, and the rare earth oxides in the molten steel are likely to interact with the nozzle refractory material to cause nozzle flocculation, and at the same time deteriorate the top slag of the ladle. And the performance of tundish covering agent

However, it is precisely because the time interval between the addition of rare earth elements and solidification is very short that the rare earth elements do not have time to fully diffuse, so the uniformity of rare earth elements in the steel is poor

[0005] Due to the relatively large reserves of rare earth resources in my country and the microalloying advantages of rare earth elements in steel, experts, scholars and professional technicians in my country's iron and steel industry are very much looking forward to making good use of rare earth resources in iron and steel materials. However, Due to the existing method of adding rare earths, there is an obvious technical bottleneck problem, which seriously restricts the application and development of rare earths in the iron and steel industry

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