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Cerium iron alloy and preparation method thereof

A ferroalloy and ferrocerium technology, applied in the field of cerium ferroalloy and its preparation, can solve the problems of high local concentration of rare earth metals, high smelting temperature requirements, affecting product consistency, etc., and achieves broad development and market prospects, high product quality, and cost. low effect

Inactive Publication Date: 2017-06-13
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 is high; 3) The melting temperature is relatively high. Since rare earth metals and pure iron are used as raw materials, the melting temperature requirements are high
This method has low production cost and simple process, but it also has the following defects: the distribution of rare earth and iron in the alloy fluctuates greatly, it is difficult to control, and the distribution error is as high as 3%-5%, which affects product consistency

Method used

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  • Cerium iron alloy and preparation method thereof
  • Cerium iron alloy and preparation method thereof
  • Cerium iron alloy and preparation method thereof

Examples

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preparation example Construction

[0036] The preparation process of ferrocerium alloy 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 cerium fluoride and lithium fluoride, cerium oxide is used as the electrolytic raw material, and direct current is applied to electrolyze to obtain a cerium-iron master alloy;

[0040] Step 3: using the cerium-iron master alloy and iron as raw materials, adopting a fusion method to prepare a cerium-iron alloy meeting the requirements.

[0041] The equipment for melting ferrocerium master alloy into ferrocerium alloy is medium frequency induction furnace. The melting process is carried out u...

Embodiment 1

[0047] A Φ650mm circular graphite electrolytic cell is used. The anode is composed of four graphite plates. The cerium fluoride in the electrolyte is 80wt%, lithium fluoride is 20wt%, the cathode is a 70mm pure iron rod, the average current intensity is 5600A, and the anode current density is 0.5- 1.0A / cm 2 , cathode current density 4-22A / cm 2, the electrolysis temperature was maintained at 900-1050°C, continuous electrolysis for 350 hours, 3423kg of cerium oxide was consumed, and 3149kg of cerium-iron master alloy was obtained, with an average cerium content of 90% and a current efficiency of 83%. The alloy composition results are shown in Table 1.

[0048] Table 1 Analysis results of cerium-iron master alloy composition / wt%

[0049] Ce Fe C O P S Si mn 90.0 9.88 0.0079 0.0097 ＜0.01 ＜0.005 0.010 ＜0.005

[0050] Using the cerium-iron master alloy prepared in this example as a raw material, take 1.7 kg of cerium-iron master alloy, add 13.3 k...

Embodiment 2

[0054] A Φ650mm circular graphite electrolytic cell is used. The anode is composed of four graphite plates. The cerium fluoride in the electrolyte is 80wt%, lithium fluoride is 20wt%, the cathode is a 70mm pure iron rod, the average current intensity is 5600A, and the anode current density is 0.5- 1.0A / cm 2 , cathode current density 4-22A / cm 2 , the electrolysis temperature was maintained at 900-1050°C, continuous electrolysis for 350 hours, 3423kg of cerium oxide was consumed, and 3149kg of cerium-iron alloy was obtained, with an average cerium content of 90% and a current efficiency of 83%. The results of the alloy composition are shown in Table 3.

[0055] Table 3 Analysis results of cerium-iron master alloy composition / wt%

[0056] Ce Fe C O P S Si mn 90.0 9.88 0.0079 0.0097 ＜0.01 ＜0.005 0.010 ＜0.005

[0057] Using the cerium-iron master alloy prepared in this example as a raw material, take 5 kg of the cerium-iron master alloy, add 10 ...

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Abstract

The invention discloses a cerium iron alloy. The content of cerium 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 cerium iron alloy. The prepared cerium 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 cerium-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 alloy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C35/00C22C33/06C25C3/34
CPCC22C35/00C22C33/06C25C3/34
Inventor 杨占峰高日增于雅樵陈国华刘玉宝刘冉张文灿苗旭晨吕卫东
Owner BAOTOU RES INST OF RARE EARTHS
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