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Method for improving rare earth yield in vacuum induction melting process

A vacuum induction smelting and yield technology, which is applied in the field of vacuum induction smelting to increase the yield of rare earths, can solve the problems of low yields of rare earth elements, reduce the dissipation of rare earths, improve corrosion resistance, and increase the utilization rate Effect

Active Publication Date: 2022-07-08
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a method for improving the yield of rare earth elements in the vacuum induction smelting process, so as to solve the problem of rare earth element yield in the vacuum induction smelting process. low rate problem

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  • Method for improving rare earth yield in vacuum induction melting process
  • Method for improving rare earth yield in vacuum induction melting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] 20Kg of rare earth microalloyed NM400 was prepared.

[0084] In terms of mass percentage, the composition of rare earth microalloyed NM400 is shown in Table 2:

[0085] Table 2 NM400 composition / wt%

[0086] C Si Mn Cr Nb Ti B Ce 0.20 0.60 1.50 0.40 0.022 0.015 0.0010 0.004

[0087] 1. Preparation of melting crucible and feeder

[0088] (1) Use cerium oxide, fused magnesia, and lime as raw materials, and configure them in a mass percentage of 1:7:1. After uniform mixing, press into a melting crucible and, after drying, carry out high-temperature sintering treatment at 1550 ° C . The fabricated smelting crucible with chemical composition of MgO 65wt%, CaO 11wt%, CeO 2 12wt%, Al 2 O 3 3wt%, the balance is some impurities and volatiles, and binders.

[0089](2) The side wall of the feeder is made of alumina, and the bottom surface of the feeder is made of 0.2mm aluminum foil. The aluminum foil surrounds the bottom of the cylinde...

Embodiment 2

[0101] 20Kg of rare earth microalloyed NM400 was prepared.

[0102] In terms of mass percentage, the composition of rare earth microalloyed NM400 is shown in Table 3:

[0103] Table 3 NM400 composition / wt%

[0104] C Si Mn Cr Nb Ti B Ce 0.20 0.60 1.50 0.40 0.022 0.015 0.0010 0.004

[0105] 1. Preparation of melting crucible and feeder

[0106] Use cerium oxide, fused magnesia, and lime as raw materials, and configure them in a mass percentage of 0.9:6.5:1.4. After uniform mixing, they are pressed into melting crucibles and side walls of feeders. After drying, they are fired at high temperature at 1550 °C. into processing. Manufactured smelting crucible and feeder sidewall with chemical composition of MgO 65wt%, CaO 11wt%, CeO 2 12wt%, Al 2 O 3 3wt%, the balance is some impurities and volatiles, and binders.

[0107] The material of the bottom surface of the feeder is 0.05mm thick aluminum foil, the aluminum foil surrounds the bottom...

Embodiment 3

[0119] 20Kg of rare earth microalloyed NM400 was prepared.

[0120] In terms of mass percentage, the composition of rare earth microalloyed NM400 is shown in Table 4:

[0121] Table 4 NM400 composition / wt%

[0122] C Si Mn Cr Nb Ti B Ce 0.20 0.60 1.50 0.40 0.022 0.015 0.0010 0.008

[0123] 1. Preparation of melting crucible and feeder

[0124] Using cerium oxide, fused magnesia, and lime as raw materials, it is configured according to the mass percentage of 0.8:6.3:0.9. After uniform mixing, it is pressed into the melting crucible and the side wall of the feeder. After drying, it is fired at high temperature at 1550 °C. into processing. Manufactured smelting crucible and feeder sidewall with chemical composition of MgO 65wt%, CaO 11wt%, CeO 2 12wt%, Al 2 O 3 2wt%, the balance is some impurities and volatiles, and binders.

[0125] The material of the bottom surface of the feeder is 0.2mm thick aluminum foil, the aluminum foil surrou...

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Abstract

The invention relates to a method for increasing the yield of rare earth in the vacuum induction melting process, and belongs to the technical field of vacuum induction furnace smelting. The problem that the rare earth yield is low when a rare earth-containing material is smelted in a vacuum furnace is solved. The invention discloses a method for improving the yield of rare earth in a vacuum induction melting process. The method comprises the following steps: S1, preparing materials according to an alloy; s2, the ingredient alloy is put into a charging tray; s3, the rare earth alloy is put into a feeder; s4, vacuumizing, and filling argon into the hearth; s5, power is supplied for heating, and after the matrix metal material is melted down, the ingredient alloy is added; s6, after the refining period is finished, a feeder is fed into the molten pool; s7, the feeder is lifted, casting is conducted, heat preservation is conducted for 30 min, and then tapping is conducted; in the step S1, a refractory material used for smelting the crucible is a magnesium-calcium-rare earth material; in the step S3, the side wall of the feeder is made of refractory materials, and the bottom face of the feeder is a metal sheet with the melting point lower than that of smelting alloy. The magnesium-calcium rare earth refractory material and the immersion type feeder are used, and the rare earth yield is increased to 85% or above.

Description

technical field [0001] The invention belongs to the technical field of vacuum induction furnace smelting, and particularly relates to a method for improving the yield of rare earth in a vacuum induction smelting process. Background technique [0002] Rare earth elements have metallurgical advantages such as deoxidation, desulfurization, and inclusion modification, and the density of rare earth elements is medium among metals, and it is easy to distribute evenly in various alloys, laying the foundation for the application of rare earths in alloys. However, the chemical activity of rare earth elements is very high. In the process of alloy preparation, rare earth elements are mixed with crucible materials (such as Al 2 O 3 , SiO 2 , MgO, etc.) and atmosphere components (such as O 2 , N 2 , CO 2 etc.) will have a strong reaction. Therefore, how to improve the yield of rare earth elements has received extensive attention. [0003] At present, in vacuum induction melting of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21C5/52C04B35/66C04B35/04
CPCC22C33/06C22C38/005C21C5/5241C21C5/527C04B35/66C04B35/04C04B2235/3208C04B2235/3229C04B2235/3224C04B2235/3217C04B2235/3227Y02P10/25
Inventor 梁强吴伟赵博崔怀周赵进宣林腾昌李龙飞何赛
Owner CENT IRON & STEEL RES INST