Lanthanum iron alloy and preparation method thereof

A technology of lanthanum-iron alloy and master alloy, which is applied in the field of lanthanum-iron alloy 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, low cost, and high product quality. high effect

Inactive Publication Date: 2017-05-31
BAOTOU RES INST OF RARE EARTHS +1
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  • Abstract
  • Description
  • Claims
  • 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 i...

Method used

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  • Lanthanum iron alloy and preparation method thereof
  • Lanthanum iron alloy and preparation method thereof
  • Lanthanum iron alloy and preparation method thereof

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preparation example Construction

[0036] The preparation technology of the ferro-lanthanum alloy used for producing rare earth steel comprises the following steps:

[0037] 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;

[0038] The material of the receiver can be one of iron, rare earth oxide, and boron nitride.

[0039] Step 2: In the fluoride molten salt electrolyte system of lanthanum fluoride and lithium fluoride, lanthanum oxide is used as the electrolytic raw material, and direct current is applied to electrolyze to obtain a lanthanum-iron master alloy;

[0040] Step 3: Using the lanthanum-iron master alloy and iron as raw materials, a fusion method is used to prepare a lanthanum-iron alloy that meets the requirements.

[0041] The equipment for melting lanthanum-iron master alloy into lanthanum-iron alloy is an intermediate frequency inductio...

Embodiment 1

[0047] A Φ650mm circular graphite electrolytic cell is used. The anode is composed of four graphite plates. The electrolyte contains 80wt% lanthanum fluoride and 20wt% lithium fluoride. The cathode is a pure iron rod with a diameter of 70mm. The average current intensity is 5000A and the anode current density is 0.5 -1.0A / cm 2 , cathode current density 5-20A / cm 2, the electrolysis temperature was maintained at 900-1050 ° C, continuous electrolysis for 150 hours, 1250 kg of lanthanum oxide was consumed, and 1151 kg of lanthanum-iron master alloy was obtained, with an average lanthanum content of 90% and a current efficiency of 80%. The alloy composition results are shown in Table 1.

[0048] Table 1 lanthanum-iron master alloy composition analysis results / wt%

[0049] La Fe C O P S Si mn 90.0 9.85 0.0085 0.0094 ＜0.01 ＜0.005 0.012 ＜0.005

[0050] Using the lanthanum-iron master alloy prepared in this example as a raw material, take 1.7 kg of ...

Embodiment 2

[0054] A Φ650mm circular graphite electrolytic cell is used. The anode is composed of four graphite plates. The electrolyte contains 80wt% lanthanum fluoride and 20wt% lithium fluoride. The cathode is a pure iron rod with a diameter of 70mm. The average current intensity is 5000A and the anode current density is 0.5 -1.0A / cm 2 , cathode current density 5-20A / cm 2 , the electrolysis temperature was maintained at 900-1050°C, the electrolysis was continued for 150 hours, 1250kg of lanthanum oxide was consumed, and 1151kg of lanthanum-iron master alloy was obtained, with an average lanthanum content of 90% and a current efficiency of 80%. The alloy composition results are shown in Table 3.

[0055] Table 3 lanthanum-iron master alloy composition analysis results / wt%

[0056] La Fe C O P S Si mn 90.0 9.85 0.0085 0.0094 ＜0.01 ＜0.005 0.012 ＜0.005

[0057] Using the lanthanum-iron master alloy prepared in this example as a raw material, take 5 kg o...

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Abstract

The invention discloses a lanthanum iron alloy. The content of lanthanum is 0-95 wt%; 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 lanthanum iron alloy. The prepared lanthanum iron alloy is uniform in component, low in segregation, low in impurity content, high in rare earth yield, low in cost, free of pollution, high in rare earth yield when being applied to rare earth steel, 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 lanthanum-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 all...

Claims

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Application Information

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IPC IPC(8): C25C3/36C22C28/00C22C38/00C22C35/00
CPCC22C28/00C22C35/00C22C35/005C22C38/005C25C3/36
Inventor 张志宏陈国华刘玉宝高日增吕卫东于雅樵赵二雄于兵陈宇昕
Owner BAOTOU RES INST OF RARE EARTHS
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