Production technology of metal molybdenum

A production process and metal technology, applied in the production process field of metal molybdenum, can solve the problems of high energy consumption, hidden safety hazards and high temperature, and achieve the effects of low production cost, high production efficiency and low cost

Inactive Publication Date: 2014-07-16
NINGXIA ORIENT TANTALUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Molybdenum powder mainly adopts the traditional preparation process, generally using molybdenum dioxide, molybdenum trioxide or ammonium molybdate as raw materials, in a fixed bed or fluidized bed reduction equipment, the method of hydrogen reduction is used to prepare metal molybdenum powder , The traditional preparation process of molybdenum powder has the shortcomings of long storage period and high temperature, and a large amount of hydrogen is used in the reduction process. From the perspective of production safety, there are huge safety hazards, and the preparation of hydrogen requires a lot of energy. Therefore, there are certain limitations in the existing production technology of molybdenum powder and molybdenum products

Method used

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  • Production technology of metal molybdenum

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Effect test

Embodiment 1

[0020] Using MoO 3 As raw material, its technological process is:

[0021] Weigh 100Kg of MoO 3 Powder, 39.4Kg aluminum powder, 30Kg calcium fluoride powder, all required to be powders below 100 mesh, mixed in the mixer for 2 hours; then put the mixed powder into the reaction vessel (reaction furnace made of refractory material) During the charging process, the material is compacted, and then the reaction vessel is evacuated until the vacuum reaches 10 -1 After Pa, the material is ignited by resistance heating, so far the aluminothermic reduction reaction starts to proceed automatically by the heat released by itself, and the reaction is completed within 3 minutes. After natural cooling, the metal layer is separated from the slag, and the primary alloy is obtained. The primary alloy is broken into particles less than 3cm, and the metal molybdenum is obtained by melting twice in a vacuum electron beam furnace, and the melting power is 260kW; the chemical composition of the me...

Embodiment 2

[0023] Using MoO 2 As raw material, its technological process is:

[0024] Weighing 100Kg MoO 2 powder, 29.5Kg aluminum powder, 20Kg calcium fluoride powder, powder below 100 mesh is required, mixed in the mixer for 2 hours; ), the material is compacted during the charging process, and then the reaction vessel is evacuated until the vacuum reaches 10 -1 After Pa, the material is ignited by resistance heating, and the aluminothermic reduction reaction starts to proceed automatically by the heat released by itself, and the reaction is completed within 3 minutes. After natural cooling, the metal layer is separated from the slag, and the primary alloy is obtained. The primary alloy is crushed into particles smaller than 3cm, and then melted twice in a vacuum electron beam furnace to obtain metal molybdenum, and the melting power is 260kW.

[0025] Table 1:

[0026]

[0027] Table 1 above shows the analysis results of molybdenum metal. It can be seen that the metal molybden...

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Abstract

The invention relates to a production technology of metal molybdenum. The production technology is characterized by comprising the following steps: firstly, an aluminium powder and a calcium fluoride powder are added into a molybdenum oxide powder; the materials are fully mixed and the mixed materials are sent into a reaction vessel; the reaction vessel is vacuumized; by a heating mode, an exothermic agent is ignited to carry out an aluminothermic reduction reaction so as to obtain a primary alloy; and finally, the primary alloy is melted and purified to obtain high-purity metal molybdenum. According to the production technology of metal molybdenum, molybdenum oxide, the aluminium powder and calcium fluoride are used as raw materials; by an aluminothermic reduction method, the primary molybdenum aluminium alloy is produced; and the alloy is purified by a vacuum electron beam furnace; and metal molybdenum is prepared by characteristics of large differences between molybdenum and aluminium melting points and different metallic vapour pressures of molybdenum and aluminium. By the technology, production costs of metal molybdenum are greatly reduced. The metal molybdenum produced by the technology has characteristics of low cost, short production cycle, high yield and the like.

Description

technical field [0001] The invention relates to a production process of metal molybdenum. Background technique [0002] Molybdenum is mainly used in the iron and steel industry, most of which are directly used in steelmaking or cast iron after being briquetted from industrial molybdenum oxide, and a small part is smelted into ferromolybdenum and then used in steelmaking. The content of molybdenum in low-alloy steel is not more than 1%, but the consumption in this area accounts for about 50% of the total consumption of molybdenum. Adding molybdenum to stainless steel can improve the corrosion resistance of steel. Adding molybdenum to cast iron can improve the strength and wear resistance of iron. Nickel-based superalloys containing 18% molybdenum have the characteristics of high melting point, low density and small thermal expansion coefficient, and are used in the manufacture of various high-temperature components in aviation and aerospace. Molybdenum is widely used in el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34
Inventor 白掌军杨波颉维平牟东黄全亨李明阳石晓军张静
Owner NINGXIA ORIENT TANTALUM IND
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