Method for preparing molybdenum powders with low ferrum

An iron-molybdenum and powder technology, applied in the field of preparation of low-iron-molybdenum powder, can solve the problems of complicated preparation process, high production cost, increase of electron emission coefficient, etc., and achieve stable and controllable reaction, small size dispersion, easy to use control effect

Active Publication Date: 2014-07-23
JINDUICHENG MOLYBDENUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the current industrial production, the impurities of raw materials such as ammonium molybdate and molybdenum trioxide are usually used to reduce the Fe content in molybdenum powder. The reduction of Fe content in molybdenum is limited; in addition, in industrial production, the Fe content of molybdenum materials can also be reduced by metal smelting process, but the preparation process of this process is complicated, the production cost is high, and the requirements for impurity removal equipment are strict. Suitable for industrial mass production
[0005] In the existing industrial production, molybdenum raw materials with an Fe content of 1ppm-2ppm are usually selected to prepare low-iron molybdenum powder. However, the Fe content in the molybdenum powder prepared by the current process is above 15ppm, and Fe will significantly reduce the thermal conductivity of the molybdenum powder and increase Its electron emission coefficient, so the performance of the molybdenum powder used as photoelectric materials, targets and other materials is poor

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  • Method for preparing molybdenum powders with low ferrum
  • Method for preparing molybdenum powders with low ferrum
  • Method for preparing molybdenum powders with low ferrum

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Embodiment 1

[0021] The preparation method of the low-iron molybdenum powder of the present embodiment may further comprise the steps:

[0022] Step 1. Put the molybdenum trioxide powder with a mass purity ≥ 99.95%, an average particle size of 250 μm, and a Fe mass content of 1 ppm into a molybdenum material boat with a mass purity ≥ 98%, and pair the material boat in the reduction temperature zone of the primary reduction furnace. The molybdenum trioxide powder is subjected to a hydrogen reduction. After the first hydrogen reduction, the material boat is placed in the cooling zone of the primary reduction furnace to cool to 25°C room temperature, and the primary reduction product molybdenum dioxide is obtained in the material boat; Hydrogen reduction is a three-temperature-zone reduction system. The reduction temperature in the first temperature zone is 400°C, the reduction temperature in the second temperature zone is 500°C, and the reduction temperature in the third temperature zone is 6...

Embodiment 2

[0027] The preparation method of the low-iron molybdenum powder of the present embodiment may further comprise the steps:

[0028] Step 1. Put molybdenum trioxide powder with mass purity ≥ 99.95%, average particle size of 290 μm, and Fe mass content of 2 ppm into molybdenum material boat with mass purity ≥ 98%, and put it in the reduction temperature zone of the primary reduction furnace. The molybdenum trioxide powder is subjected to a hydrogen reduction. After the first hydrogen reduction is completed, the material boat is placed in the cooling zone of the primary reduction furnace and cooled to 25°C room temperature, and the primary reduction product molybdenum dioxide is obtained in the material boat; Hydrogen reduction is a three-temperature-zone reduction system. The reduction temperature in the first temperature zone is 420°C, the reduction temperature in the second temperature zone is 520°C, and the reduction temperature in the third temperature zone is 580°C. The reduc...

Embodiment 3

[0033] The preparation method of the low-iron molybdenum powder of the present embodiment may further comprise the steps:

[0034]Step 1. Put molybdenum trioxide powder with a mass purity ≥ 99.95%, an average particle size of 350 μm, and a Fe mass content of 2 ppm into a molybdenum material boat with a mass purity ≥ 98%, and place it in the material boat in the reduction temperature zone of the primary reduction furnace The molybdenum trioxide powder is subjected to a hydrogen reduction. After the first hydrogen reduction is completed, the material boat is placed in the cooling zone of the primary reduction furnace and cooled to 25°C room temperature, and the primary reduction product molybdenum dioxide is obtained in the material boat; Hydrogen reduction is a three-temperature-zone reduction system. The reduction temperature in the first temperature zone is 400°C, the reduction temperature in the second temperature zone is 500°C, and the reduction temperature in the third temp...

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Abstract

The invention provides a method for preparing molybdenum powders with low ferrum, comprising the following steps of: step 1, putting the molybdenum trioxide in a primary reduction furnace, and then performing the primary hydrogen reduction reaction to produce the molybdenum dioxide; step 2, putting the molybdenum dioxide in a secondary reduction furnace, and then performing the secondary hydrogen reduction reaction to produce the coarse molybdenum powders; and step 3, screening the coarse molybdenum powders to obtain the molybdenum powders with low iron. The preparation technology provided by the invention is easy to control and simple to operate, and is safe and reliable, so that the method is suitable for industrialized batch production. The molybdenum powders prepared by the method provided by the invention have regular appearances, uniformly granularity and small size dispersibility, so that impurities are not easy to enter the molybdenum crystal lattices. The mass content of Fe in the molybdenum powders is 6 ppm-9 ppm, so that the method is suitable for photoelectric materials, sputtering target materials and spraying fields.

Description

technical field [0001] The invention belongs to the technical field of rare metal powder metallurgy, and in particular relates to a preparation method of low-iron molybdenum powder. Background technique [0002] Metal molybdenum is an important refractory metal with excellent high-temperature strength and electrical and thermal conductivity. Its chemical properties are stable and corrosion-resistant. It is an environmentally friendly material. It can be used in high-temperature furnaces, electronic and semiconductor devices, optoelectronic materials, sputtering targets And spraying and other fields have important applications. [0003] As the raw material of metal materials, molybdenum powder has a decisive influence on the performance and processing of molybdenum products. Reducing metal impurities such as iron, nickel, and chromium in molybdenum powder is an important guarantee for improving the performance of molybdenum metal. Iron in molybdenum materials will reduce the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
Inventor 王仙琴刘俊怀李晶赵虎
Owner JINDUICHENG MOLYBDENUM CO LTD
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