Iron and molybdenum containing pellets

A technology of pellets and molybdenum oxide, which is applied in the field of preparing pellets containing iron and molybdenum, which can solve the problems of prolonging the dissolution time of ferromolybdenum, loss of molybdenum, and high raw material prices

Inactive Publication Date: 2014-09-17
FERROLEGERINGAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to dissolve the ferromolybdenum block in the steel melt because the ferromolybdenum block has a high melting point, for example, commercial grade FeMo70 has a melting point of 1950°C, and since the temperature of the steel melt is quite low, the dissolution of the ferromolybdenum is mainly affected by Influence of the diffusion process, which prolongs the dissolution time of ferromolybdenum
Another factor is the high price of raw materials for aluminothermic reduction and silicothermal reduction
Also, in these processes, probably about 2% of the molybdenum is lost in the slag

Method used

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  • Iron and molybdenum containing pellets
  • Iron and molybdenum containing pellets
  • Iron and molybdenum containing pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] A mixture was prepared by adding 3% by weight of fine-grained iron powder (99% by weight Fe from AB's X-RSF40) was mixed with 84% by weight of technical grade molybdenum oxide (Mo>57% by weight, <40 μm) and 13% by weight of carbon powder (<20 μm, Carbon Black). Water was added to the mixture and green pellets were prepared in a disc granulator. According to ASTM D2216-10, the moisture content of the pellets measured by LOD is about 10% by weight. Then, the pellets were dried at room temperature to a moisture content of 2 wt%.

[0154] The green pellets were reduced in a batch furnace at a temperature of 1100° C. in an atmosphere of 95 vol-% N2 and 5 vol-% H2 for a period of 2 hours. The pellets were then allowed to cool to a temperature of about 100°C before the atmosphere was evacuated and removed from the batch furnace. The result was pellets with a weight of about 0.4 grams and a diameter of about 6-7 mm. The average geometric density of the pellets measured acc...

Embodiment 2

[0160] figure 1 Shown is a comparison of the dissolution rate of a standard reference grade of solid ferromolybdenum to the iron and molybdenum containing pellets described in the present invention, ie the novel ferromolybdenum grade. The same batch of pellets as in Example 1 was provided and therefore these pellets had the same composition as in Table 1. The average geometric density of the pellets was determined to be 2.6 g / cm as described in Example 1 3 .

[0161] The reference material was 10 standard pieces of ferromolybdenum containing 70% molybdenum by weight, no more than 2% impurities by weight and the balance being iron. Each piece measures approximately 10x50mm.

[0162] The purpose of the experiment was to evaluate whether pellets containing iron and molybdenum had a faster dissolution time than standard ferromolybdenum.

[0163] Two steel melts (a first steel melt and a second steel melt) were prepared and analyzed for their composition. The target compositio...

Embodiment 3

[0165] Mixture A was prepared by adding 2.5 wt% fine-grained iron powder (99 wt% Fe from AB's X-RSF40) was mixed with 84% by weight of technical grade molybdenum oxide (Mo>57wt.%, <40μm) and 13.5% by weight of carbon powder (<20μm, carbon black (Carbon Black)). Water was added to the mixture and green pellets were prepared in a disc granulator. After granulation, the green pellets were dried at a temperature of 90° C. for 2 hours to reduce the moisture content to below 2 wt%.

[0166] The dried green pellets were reduced for 0.5 hours at a temperature of 1120° C. in a rotary oven. Provide countercurrent weak reducing atmosphere 95vol-%N during reduction 2 and 5vol-%H 2 . The pellets were then allowed to cool to a temperature of approximately 100°C under a protective atmosphere. The result was a pellet having a weight of about 1.9 grams and a diameter of about 12 mm.

[0167] Two pellets were analyzed in a mercury porosimeter at a pressure of 4.45 psia (instrument: Micro...

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Abstract

Iron and molybdenum containing pellets and a process for producing the pellets are disclosed. A green pellet is produced from mixing an iron containing powder, a molybdenum oxide powder, and a carbonaceous powder. The green pellets can be reduced at a temperature in the range of 400-1500 DEG C. The pellets can be briquetted.

Description

technical field [0001] The present invention relates to a method for the preparation of iron and molybdenum containing pellets and pellets produced by the method. Background technique [0002] Ferromolybdenum is an iron-molybdenum alloy typically having a molybdenum content of 60-80% by weight. [0003] In most commercial applications, ferromolybdenum is prepared by carbothermic, aluminothermic or silicothermal reduction of molybdenum trioxide. High-carbon ferromolybdenum is prepared by carbothermal method, and low-carbon ferromolybdenum is prepared by the latter two methods. Low carbon ferromolybdenum is more common than high carbon alloys. Ferromolybdenum lumps prepared by these methods typically have about 9 g / cm 3 Density. It is difficult to dissolve the ferromolybdenum block in the steel melt because the ferromolybdenum block has a high melting point, for example, commercial grade FeMo70 has a melting point of 1950°C, and since the temperature of the steel melt is q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34C21C5/52C22C35/00
CPCC21C7/0006C22C27/04C22C30/00C22B1/2406C21C5/5264C22B34/34C21C2007/0062Y02P10/20
Inventor J.阿维德森
Owner FERROLEGERINGAR
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