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Process and device for preparing superfine nickel powder

A process and technology of nickel powder, which is applied in the field of ultrafine powder preparation, can solve problems such as cohesive flow loss, low purity of ultrafine nickel powder, and poor fluidity of ultrafine nickel powder, so as to prevent flow loss and improve heat utilization High, uniform and rapid fluidization effect

Active Publication Date: 2013-09-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor fluidity and cohesive loss of ultrafine nickel powder at high temperature, resulting in low purity of ultrafine nickel powder, and proposes a two-stage low-temperature pre-reduction granulation-high-temperature deep reduction process craft

Method used

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  • Process and device for preparing superfine nickel powder
  • Process and device for preparing superfine nickel powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Ultrafine nickel oxide (particle size smaller than 2 The volume concentration is 50%, and the contact mode is countercurrent, so that the material is in a state of bubbling fluidization. The residence time of the materials in the first fluidized bed reactor 5 is 15 minutes, so that the conversion rate of nickel oxide after the reaction in the first fluidized bed reactor is about 80%; then it is sent to the second through the second feed valve 6 Fluidized bed reactor 7; the tail gas is discharged through the outlet of the first cyclone 11, and enters the burner of the combustion chamber 15 to produce high-temperature hot flue gas. The high-temperature flue gas discharged from the outlet of the combustion chamber 15 enters the cyclone preheater 3 and superfine After the nickel oxide powder undergoes heat exchange, the entrained fine powder is removed by the cyclone 16 and the bag filter 17 and then vented; the reaction temperature of the second fluidized bed reactor 7 is 60...

Embodiment 2

[0059] Ultrafine nickel oxide (particle size smaller than 2 The volume concentration is 30%, and the contact mode is countercurrent, so that the material is in a state of bubbling fluidization. The residence time of the material in the first fluidized bed reactor 5 is 10 minutes, so that the conversion rate of nickel oxide after the reaction in the first fluidized bed reactor is about 80%; then it is sent to the second through the second feed valve 6 Fluidized bed reactor 7; tail gas is discharged through the outlet of the first cyclone 11, and enters the burner of the combustion chamber 15 to produce high-temperature hot flue gas. The high-temperature flue gas discharged from the outlet of the combustion chamber 15 enters the cyclone preheater 3 and superfine After the nickel oxide powder undergoes heat exchange, the entrained fine powder is removed by the cyclone 16 and the bag filter 17 and then vented; the reaction temperature of the second fluidized bed reactor 7 is 500°C, ...

Embodiment 3

[0062] The ultrafine nickel oxide (particle size smaller than the 2 The volume concentration is 60%, and the contact mode is cross flow, so that the material is in a state of bubbling fluidization. The residence time of the material in the first fluidized bed reactor 5 is 5 minutes, so that the conversion rate of nickel oxide after the reaction in the first fluidized bed reactor 5 is about 80%; then it is sent to the second feed valve 6 through the second feed valve 6 Two fluidized bed reactor 7; the tail gas is discharged through the outlet of the first cyclone separator 11, and enters the burner of the combustion chamber 15 to produce high-temperature hot flue gas. The high-temperature flue gas discharged from the outlet of the combustion chamber 15 enters the cyclone preheater 3 and super After the fine nickel oxide powder undergoes heat exchange, the entrained fine powder is removed by the cyclone 16 and the bag filter 17 and then vented; the reaction temperature of the seco...

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Abstract

The invention relates to a process and a device for preparing superfine nickel powder. According to the process, the two-stage process of low-temperature prereduction prilling and high-temperature deep reduction is conducted on superfine nickel protoxide to prepare the nickel powder. The device comprises a first fluidized bed reactor and a second fluidized bed reactor which is connected with the first fluidized bed reactor in sequence. According to the process and the device, for the core, the two processes of low-temperature prereduction prilling and high-temperature deep reduction and a doble-fluidized bed reactor system adapting to prereduction and deep reduction are adopted, uniform and rapid fluidization of particles can be achieved, purity of the prepared nickel powder can achieve more than 99%.

Description

Technical field [0001] The invention belongs to the technical field of ultrafine powder preparation, and relates to a process and a device for preparing ultrafine nickel powder. Background technique [0002] The industrialized mass production technology of ultra-fine metal nickel powder is a frontier topic and development direction in the field of ultra-fine metal powder preparation. Superfine nickel powder (particle size <1μm) has a great surface effect and volume effect, and has unique physical and chemical properties in terms of magnetism, sintering activity, and catalytic performance. It has broad application prospects in magnetic materials, battery anode materials, powder metallurgy and other fields. [0003] At present, the preparation methods of ultrafine nickel powder are divided into physical methods and chemical methods. The physical methods include evaporation-condensation methods and mechanical crushing methods; chemical methods include reduction methods, electrolysi...

Claims

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Application Information

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IPC IPC(8): B22F9/22
Inventor 李军朱庆山李洪钟刘欣伟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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