Method and device for preparing superfine copper powder

A technology of ultra-fine copper powder and copper oxide, which is applied in separation methods, combined devices, chemical instruments and methods, etc. flow etc.

Pending Publication Date: 2021-09-03
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

[0005] The purpose of the present invention is to solve the problem of instantaneous loss of flow during reduction and sintering of ultra-fine copper oxides, resulting in low purity of ultra-fine copper powder and sintering of primary particle size, and proposes a two-stage process of low-temperature pre-reduction-high-temperature deep reduction process
(4) The added...

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Nano-copper oxide powder (particle size 110nm) enters the cyclone preheater 4 to preheat to 250°C through the vibrating feeder 2 and the airflow conveying device 3, and sends it into the first fluidization through the first feed valve 5 and the riser 6. The bed reactor 7 is in contact with the first fluidized bed carrier gas PG1 from the bottom of the first fluidized bed reactor 7 and undergoes a reduction reaction, the reaction temperature is 210° C., and the superficial gas velocity of the carrier gas is 1 m / s, Reducing gas H 2 The volume concentration is 10%, and the contact method is countercurrent, so that the material is in a bubbling fluidized state. The residence time of the material in the first fluidized bed reactor 7 is 20min, so that the conversion rate of the copper oxide after the reaction in the first fluidized bed reactor is about 70%; Bed reactor 9; tail gas is discharged through the outlet of the first cyclone separator 13, and enters the combustion c...

Embodiment 2

[0058] Nano-copper oxide powder (particle size 120nm) enters the cyclone preheater 4 to preheat to 200°C through the vibrating feeder 2 and the air conveying device 3, and sends it into the first fluidization through the first feed valve 5 and the riser 6. The bed reactor 7 is in contact with the first fluidized bed carrier gas PG1 from the bottom of the first fluidized bed reactor 7 and undergoes a reduction reaction, the reaction temperature is 180°C, and the superficial gas velocity of the carrier gas is 0.5m / s , the reducing gas H 2 The volume concentration is 30%, and the contact method is countercurrent, so that the material is in a bubbling fluidized state. The residence time of the material in the first fluidized bed reactor 7 is 3min, so that the conversion rate of the copper oxide after the reaction in the first fluidized bed reactor is about 70%; Bed reactor 9; tail gas is discharged through the outlet of the first cyclone separator 13, and enters the combustion ch...

Embodiment 3

[0060] Ultrafine copper oxide powder (particle size 1-2μm) enters the cyclone preheater 4 to preheat to 200°C through the vibrating feeder 2 and the air conveying device 3, and sends it into the first feed valve 5 and the riser 6 into the first The fluidized bed reactor 7 is in contact with the first fluidized bed carrier gas PG1 from the bottom of the first fluidized bed reactor 7 and undergoes a reduction reaction. The reaction temperature is 150° C., and the superficial gas velocity of the carrier gas is 0.1 m / s, reducing gas H 2 The volume concentration is 20%, and the contact method is cross-flow, so that the material is in a bubbling fluidized state. The residence time of the material in the first fluidized bed reactor 7 is 60min, so that the conversion rate of copper oxide after the reaction in the first fluidized bed reactor is about 80%; Bed reactor 9; tail gas is discharged through the outlet of the first cyclone separator 13, and enters the combustion chamber 15 bu...

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Abstract

The invention discloses a method and device for preparing superfine copper powder. According to the method, superfine copper oxide is subjected to powder preheating, two-stage method reduction, cooling and surface treatment, and the superfine copper powder is obtained. The device comprises a first fluidized bed reactor and a second fluidized bed reactor which are connected in sequence. According to the method and the device, the two processes of low-temperature pre-reduction and high-temperature deep reduction are adopted, so that particle sintering can be prevented, uniform and rapid fluidization of particles is achieved, the purity of the prepared superfine copper powder reaches 99% or above, and the primary particle size of the copper powder is evenly distributed within the range of 50-200 nm.

Description

technical field [0001] The invention belongs to the technical field of ultrafine powder preparation, and relates to a method and a device for preparing ultrafine copper powder. Background technique [0002] Ultrafine copper powder (particle size<1μm) has good electrical conductivity, catalytic activity, lubricity and color, and can be widely used in powder metallurgy, conductive paste, hydrogenation / dehydrogenation catalyst, grease additive and other fields. Metal copper with nanometer size has a higher specific surface area than micron-sized metal copper powder, strong activity, good dispersion, purple-red color, and excellent performance. [0003] At present, the methods for preparing ultrafine copper powder include physical methods and chemical methods. Physical methods include high-energy ball milling, spraying, and evaporation condensation, and chemical methods include electrodeposition and liquid phase reduction. (1) high-energy ball milling method, such as CN1025...

Claims

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Application Information

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IPC IPC(8): B22F9/22B01J8/26B01D50/00
CPCB22F9/22B01J8/26B22F2301/10
Inventor 李军朱庆山张旭李洪钟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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