Rare earth iron alloy and preparation method thereof

A ferroalloy and rare earth technology, which is applied in the field of rare earth ferroalloy and its preparation, can solve the problems of high local concentration of rare earth metals, affecting product consistency, and high requirements for melting temperature, and achieves broad development and market prospects, controllable rare earth content, and product quality high effect

Inactive Publication Date: 2017-06-13
BAOTOU RES INST OF RARE EARTHS +1
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  • Application Information

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Problems solved by technology

This method is the method commonly used at present, and its process technology is simple, can make multi-element master alloy or application alloy, but also has deficiency: 1) rare earth metal easily local concentration is too high in molten iron, produces segregation; 2) this method The raw materials used are rare earth metals, especially for medium and heavy rare earth metals, the preparation process is complicated and the cost is h

Method used

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  • Rare earth iron alloy and preparation method thereof
  • Rare earth iron alloy and preparation method thereof
  • Rare earth iron alloy and preparation method thereof

Examples

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preparation example Construction

[0037] A preparation process for rare earth iron alloys for producing rare earth steels, comprising the following steps:

[0038] Step 1: Graphite is used as the electrolytic cell, the graphite plate is used as the anode, the iron rod is used as the self-consumable cathode, and there is a receiver containing the alloy under the cathode;

[0039] The material of the receiver can be one of iron, rare earth oxide, and boron nitride.

[0040] Step 2: In the fluoride molten salt electrolyte system of rare earth fluoride and lithium fluoride, the rare earth oxide is used as the electrolytic raw material, and the rare earth iron master alloy is obtained by direct current electrolysis;

[0041] Step 3: The rare earth iron master alloy and iron are used as raw materials, and the rare earth iron alloy is prepared by a melting method.

[0042] The equipment for melting rare earth iron master alloys into rare earth iron alloys is an intermediate frequency induction furnace. The melting ...

Embodiment 1

[0049]A Φ650mm circular graphite electrolytic cell is used. The anode is composed of four graphite plates. In the electrolyte, scandium fluoride is 80wt%, lithium fluoride is 20wt%, the cathode is a 70mm pure iron rod, the average current intensity is 5000A, and the anode current density is 0.5- 1.0A / cm 2 , cathode current density 8-25A / cm 2 , the electrolysis temperature was maintained at 900-1050°C, the electrolysis was continued for 240 hours, 870 kg of scandium oxide was consumed, and 733 kg of scandium-iron alloy was obtained, with an average scandium content of 75% and a current efficiency of 82%. The alloy composition results are shown in Table 1.

[0050] Table 1 Rare earth iron master alloy composition analysis results / wt%

[0051] sc Fe C O P S Si mn 75.0 24.55 0.0085 0.0094 ＜0.01 ＜0.005 0.012 ＜0.005

[0052] Using the scandium-iron master alloy prepared in this example as a raw material, take 2 kg of scandium-iron master alloy, a...

Embodiment 2

[0056] A Φ650mm circular graphite electrolytic cell is used, the anode is composed of four graphite plates, the electrolyte contains 75wt% gadolinium fluoride and 25wt% lithium fluoride, the cathode is a 70mm pure iron rod, the average current intensity is 4500A, and the anode current density is 0.5- 1.0A / cm 2 , cathode current density 4-15A / cm 2 , the electrolysis temperature was maintained at 900-1050°C, the electrolysis was continued for 150 hours, 1223kg of gadolinium oxide was consumed, and 1287kg of gadolinium-iron alloy was obtained, with an average gadolinium content of 80% and a current efficiency of 78%. The alloy composition results are shown in Table 3.

[0057] Table 3 Rare earth iron master alloy composition analysis results / wt%

[0058] Gd Fe C O P S Si mn 80.10 19.48 0.0084 0.0092 ＜0.01 ＜0.005 0.010 ＜0.005

[0059] Using the gadolinium-iron master alloy prepared in this example as a raw material, take 3.8 kg of gadolinium-ir...

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Abstract

The invention discloses a rare earth iron alloy. The content of rare earth is 0-95 wt%; and the balance is iron and inevitable impurities with the total quantity of less than 0.5 wt%, wherein oxygen is not more than 0.01 wt%, carbon is not more than 0.01 wt%, phosphorus is not more than 0.01 wt%, and sulfur is not more than 0.005 wt%. The invention further discloses a preparation method of the rare earth iron alloy. The prepared rare earth iron alloy is uniform in component, low in segregation, low in impurity content, high in rare earth yield, low in cost and free of pollution, is applied to the rare earth steel, and is high in rare earth yield, prominent in effect and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a rare earth metal material, in particular to a rare earth iron alloy and a preparation method thereof. Background technique [0002] At present, steel is the largest metal structural material and is widely used in construction, energy, transportation, aerospace and other fields. The application and research of rare earths in steel have also developed rapidly. The addition of rare earths to molten steel can desulfurize, deoxidize, change the shape of inclusions, etc., and can improve the plasticity, stamping performance, wear resistance and welding performance of steel. Various rare earth steels such as rare earth steel plates for automobiles, die steels, rails, etc. have been widely used. [0003] The addition method of rare earth in the production process of rare earth steel has always been the focus of scientific research. The existing addition methods include wire feeding method, cored wire, rare earth iron intermediate al...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C33/06
CPCC22C38/005C22C33/06C22C35/00C25C3/34
Inventor 张志宏刘玉宝陈国华于雅樵高日增陈宇昕于兵张先恒赵二雄
Owner BAOTOU RES INST OF RARE EARTHS
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