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Apparatus and method for preparing metal or alloy powder by direct reduction of metal compound

A metal compound and alloy powder technology, applied in the field of electrochemistry, achieves the effects of high current efficiency, simple process and significant economic benefits

Active Publication Date: 2020-09-01
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no need to press and sinter metal mineral powder to obtain metal mineral discs

Method used

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  • Apparatus and method for preparing metal or alloy powder by direct reduction of metal compound
  • Apparatus and method for preparing metal or alloy powder by direct reduction of metal compound
  • Apparatus and method for preparing metal or alloy powder by direct reduction of metal compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A device for directly reducing metal compounds to prepare metal or alloy powders, the schematic diagram of which is shown in figure 1 , including a reaction vessel 1, a reaction vessel cover 2, a ceramic tube 6, a ceramic cover 7, a ceramic plate 8, a graphite crucible 9, a ceramic crucible 10 and a metal plate 11;

[0055] The reaction vessel 1 and the reaction vessel cover 2 are closed to form a reaction chamber; the ceramic tube 6, ceramic cover 7, ceramic disc 8, graphite crucible 9, ceramic crucible 10 and metal plate 11 are all arranged in the reaction chamber;

[0056] Wherein, the ceramic tube 6, the ceramic cover 7, and the ceramic disc 8 form a protective atmosphere chamber; the graphite crucible 9, the ceramic crucible 10, and the metal plate 11 are all arranged in the protective atmosphere chamber; the protective atmosphere chamber is provided with an inlet of a protective atmosphere containing water vapor and outlets for protective atmospheres containing wa...

Embodiment 2

[0075] A device for directly reducing metal compounds to prepare metal or alloy powders is the same as in Example 1.

[0076] A kind of method that direct reduction metal compound prepares metal or alloy powder, with embodiment 1, difference is:

[0077] (1) The total electrochemical electrolysis time is 1.5h.

[0078] (2) The maximum voltage of the power supply is adjusted to 3.8V.

[0079] image 3 The voltage and current variation curves during the whole experiment are shown. It can be seen from the change curve that the current maintains a constant 10A during this process. After the electrochemical electrolysis ends, the current fluctuates violently, and the voltage changes to a certain extent, with a maximum of 3.8V;

[0080] The XRD of the Fe powder product that present embodiment prepares can be in Figure 4 Seen in , indicating that the prepared Fe powder is pure iron.

[0081] From this example, the current efficiency of the process can be calculated to be 98%. ...

Embodiment 3

[0084] A device for directly reducing metal compounds to prepare metal or alloy powders is the same as in Example 1.

[0085] A kind of method that direct reduction metal compound prepares metal or alloy powder, with embodiment 1, difference is:

[0086] (1) With 5gFe 2 o 3 For the raw material.

[0087] (2) The voltage is fixed at 0.97V.

[0088] (3) The total electrochemical electrolysis time is 10h.

[0089] In this example, Fe 2 o 3 XRD analysis of raw materials and prepared iron powder products as Figure 6 shown. Prove that the raw material is Fe 2 o 3 , the product is Fe. The results show that the iron powder is formed by Fe at a low voltage of 0.97V 2 o 3 powder produced directly.

[0090] In this example, the scanning electron image of the prepared iron powder is as follows Figure 7 shown. The particle size of the iron product is 5-20 μm, and the particle size of the Fe powder product in this example is larger than in Example 2, because it takes a long...

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Abstract

A device and method for directly reducing metal compounds to prepare metal or alloy powder, belonging to the field of electrochemistry technology. This method is to use a metal plate as a cathode, graphite as an anode, and metal chloride as a molten salt under a protective atmosphere containing water vapor. The metal compound to be treated is placed in the molten salt and heated so that the molten salt is in a molten state. Finally, an electrochemical electrolysis reaction is carried out at a temperature between the melting temperature of the molten salt +10°C and the boiling point temperature of the molten salt -100°C at 0.5~4.1V to obtain a molten salt containing metal or alloy powder; it is then cooled in the furnace to At room temperature, the solidified salt and metal or alloy powder are separated. In this method, a metal compound is not used as a cathode. A metal plate immersed in molten salt is used as a cathode. The high conductivity of the metal plate improves the kinetics of the reaction. This method has the advantages of simple process, high efficiency and significant economic benefits, and its current efficiency is very high, close to 100%.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to a device and method for directly reducing metal compounds to prepare metal or alloy powders. Background technique [0002] The use of metal oxide or metal sulfide minerals to produce metal and alloy powders, and in the production process, does not emit greenhouse gases or harmful gases, such as carbon dioxide and sulfur dioxide, is the main direction of future industrial development, especially due to the development of powder metallurgy technology Rise, more and more technologies using powder as raw material, such as additive manufacturing and 3D printing technology, etc. and Challenge Discussion [J]. Engineering Structures, 180, (2019): 332~348. C.Buchanan, L. Gardner, Metal 3Dprinting in construction: A review of methods, research, applications, opportunities and challenges, Engineering Structures 180( 2019) 332-348). [0003] At present, using carbon as a reducing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/04C25C7/00C22C38/40C22C30/00B22F9/20
CPCB22F9/20C22C30/00C22C38/40C25C5/04C25C7/00
Inventor 阿里·雷扎·卡马里
Owner NORTHEASTERN UNIV LIAONING
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