Method and system for preparing superfine copper powder

A technology of ultra-fine copper powder and ultra-fine cuprous oxide, which is applied in the field of preparing ultra-fine copper powder, and can solve the problems of low purity of ultra-fine copper powder and loss of ultra-fine copper oxide

Pending Publication Date: 2021-09-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of the instantaneous loss of ultrafine copper oxide reduction and sintering, which leads to low purity of ultrafine copper powder, and proposes a fluidized bed method for preparing ultrafine copper powder, which is easy for continuous production

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  • Method and system for preparing superfine copper powder
  • Method and system for preparing superfine copper powder
  • Method and system for preparing superfine copper powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Use commercially available ultra-fine copper oxide powder (average particle size 2 The volume concentration is 50%, so that the material is in a state of turbulent fluidization. The residence time of the material reduction fluidized bed 7 is 10min; then it is sent to the cooling fluidized bed 9 through the discharge valve 8; the tail gas of the reduction fluidized bed 7 is discharged through the outlet of the first cyclone separator 11, and enters the combustion chamber 13 to burn to generate high temperature heat Flue gas, the high-temperature flue gas discharged from the outlet of the combustion chamber 13 enters the cyclone preheater 4 for heat exchange with the ultrafine copper oxide powder, and then the entrained fine powder is removed by the cyclone dust collector 14 and the bag filter 15 and then emptied; The reacted product is sent into the cooling fluidized bed 9 through the discharge valve 8, and the product contacts and exchanges heat with the reducing carrier...

Embodiment 2

[0055] Ultrafine copper oxide (average particle size 2 The volume concentration is 75%, so that the material is in a state of turbulent fluidization. The residence time of the material reduction fluidized bed 7 is 16min; then it is sent to the cooling fluidized bed 9 through the discharge valve 8; the tail gas of the reduction fluidized bed 7 is discharged through the outlet of the first cyclone separator 11, and enters the combustion chamber 13 for combustion to generate high-temperature heat Flue gas, the high-temperature flue gas discharged from the outlet of the combustion chamber 13 enters the cyclone preheater 4 for heat exchange with the ultrafine copper oxide powder, and then the entrained fine powder is removed by the cyclone dust collector 14 and the bag filter 15 and then emptied; The reacted product is sent into the cooling fluidized bed 9 through the discharge valve 8, and the product contacts and exchanges heat with the reducing carrier gas RG from the bottom of t...

Embodiment 3

[0058]Ultrafine copper oxide powder (average particle size <1.5um) prepared by copper nitrate through chemical precipitation-thermal decomposition method enters cyclone preheater 4 to preheat to 120 °C, it is sent into the reducing fluidized bed 7 through the feed valve 5 and the riser 6, contacts with the reducing carrier gas RG from the bottom of the reducing fluidized bed 7 and undergoes a reduction reaction, the reaction temperature is 210 °C, and the carrier gas has an apparent The gas velocity is 0.11m / s, and the volume concentration of reducing gas CO is 50%, so that the material is in a state of turbulent fluidization. The residence time of the material reduction fluidized bed 7 is 30min; then it is sent to the cooling fluidized bed 9 through the discharge valve 8; the tail gas of the reduction fluidized bed 7 is discharged through the outlet of the first cyclone separator 11, and enters the combustion chamber 13 for combustion to generate high-temperature heat Flue ga...

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Abstract

The invention discloses a method and system for preparing superfine copper powder. According to the method, preheating, reduction, cooling and passivating are carried out on superfine copper oxide powder to obtain the superfine copper powder. The system comprises a reduction fluidized bed and a cooling fluidized bed which are connected in sequence. According to the method, because the conical bed is adopted, and inert particles are added for strengthening reduction, particle sintering can be prevented, uniform and rapid fluidization of the particles is achieved, and the purity of the prepared superfine copper powder reaches 99% or above.

Description

technical field [0001] The invention belongs to the technical field of ultrafine powder preparation, and relates to a process and system for preparing ultrafine copper powder. Background technique [0002] The industrial mass production technology of ultrafine copper powder is one of the important topics in the field of ultrafine metal powder preparation. Copper powder is widely used in powder metallurgy industry, diamond tools, conductive products, and electric carbon industry. The lower the bulk density of copper powder, the higher its compressibility, forming filling and sintering activity. When used as the basic raw material of conductive products (conductive fillers, conductive adhesives, conductive pastes), the properties of copper powder, such as size, shape and dispersibility, have an important impact on the quality of the finished conductive products. For example, micron-sized particles can be used for conductive paste, and submicron copper powder (0.1-0.8 μm) is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22B22F2201/01B22F2201/10B22F2202/15
Inventor 朱庆山李军张旭李洪钟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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