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Preparation method of superfine rhenium powder

A rhenium powder and ammonium rhenate technology, which is applied in the field of metal powder manufacturing, can solve the problems of high environmental hazards of reduction products, high equipment material requirements, and discontinuous process, and achieve superior product performance, lower equipment material requirements, and fluidity. Good results

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV +1
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Problems solved by technology

The process has the advantages of controllable process and superior product performance, but there are certain problems in the process itself: in the chlorination reduction process, the rhenate needs to be chlorinated first, and then reduced, which not only complicates the operation, but also makes the process Discontinuous, and the equipment material requirements are high, and the reduction products are harmful to the environment

Method used

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  • Preparation method of superfine rhenium powder
  • Preparation method of superfine rhenium powder
  • Preparation method of superfine rhenium powder

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Embodiment Construction

[0023] Such as figure 1 As shown, the reactor 1 is heated by a resistance furnace, and its outer diameter is φ90mm. One end of the volatilizer 2 is provided with a ventilation hole 3 for inserting an oxygen pipe 4, and this hole doubles as an escape hole for volatile products, and an escape hole can also be provided at the other end, or on the cover plate 5 of the volatilizer 2. escape hole.

[0024] Weigh ammonium rhenate and load it into the volatilizer 2, place it in the decomposition zone 6, and insert the oxygen delivery pipe 4 into the vent hole 3 of the volatilizer 2. The carrier gas is introduced through the carrier gas pipe 7, and nitrogen gas is first introduced after charging, and the air in the reactor is exhausted through the through hole 8 and the exhaust hole 11, and then the temperature is raised, and the temperature of the decomposition zone 6 is set at 350-700 °C Set and control; the temperature of reduction zone 9 is set and controlled within the range of ...

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Abstract

The invention discloses a preparation method of superfine rhenium powder, taking high-purity ammonium rhenate as a raw material and comprising the following steps: heating the high-purity ammonium rhenate at an oxidizing atmosphere to decompose into high valence rhenium oxide Re2O7; and then reducing Re2O7 by H2 or CO to obtain superfine rhenium powder. The superfine rhenium powder obtained by the method of the invention has the advantages of low impurity content, sphere or sphere-like structure, even particle size distribution, high crystallinity, low oxygen content, good fluidity, high tap density and the like.

Description

technical field [0001] The invention relates to a method for producing metal powder by using a gas reducing agent. technical background [0002] Rhenium is a rare refractory metal with many excellent properties. Rhenium and its alloys are widely used in national defense, aerospace and electronics industries, and petrochemical industries. There are many methods for preparing metal rhenium powder. Chinese patent CN1396027 provides a method for preparing high-purity rhenium powder. Stir continuously, filter and dry to make ammonium rhenate powder, and reduce it in hydrogen at 400-600°C to high-purity rhenium powder. This method has the advantages of low reduction temperature and low impurity content, etc., but because the traditional gas-solid reaction method is still used for reduction, the controllability of the production process is not strong. In addition, the powder shape is irregular, and the particles are generally coarse. Wide range of particle size distribution, poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/28
Inventor 白猛刘志宏周乐君李启厚刘智勇张传福
Owner CENT SOUTH UNIV
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