Method for micro-alloying of rare earth elements adsorbed based on carbon carrier in steel material

Abstract

The invention relates to a method for micro-alloying of rare earth elements adsorbed based on a carbon carrier in a steel material. The method comprises the following steps of selecting soluble rare earth salt, dissolving the soluble rare earth salt to prepare a rare earth salt solution, adsorbing and fixing the rare earth elements in the solution through the carbon carrier to form a rare earth compound taking carbon as a carrier, uniformly mixing the rare earth compound with a deoxidizer, preparing a press cake or long linear cored wire, and carrying out a reduction reaction on the press cakeor long linear cored wire and the deoxidizer in the microalloying process to reduce the rare earth elements and dissolve the rare earth elements in molten steel, thereby completing the microalloyingprocess of the rare earth in the steel material. The method is safe in production process, simple and easily available in material source, easy in industrial production, energy-saving and environment-friendly. The microalloying amount of the rare earth in the obtained steel material is high and can reach 10-100 ppm, the yield of the rare earth elements is high, uniformity is good, the residual rare earth solution after adsorption can be repeatedly used, resource allocation and utilization are efficient and reasonable, and good application prospects are achieved.

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...

AI Technical Summary

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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