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Device and method for preparing superfine nickel powder

A nickel powder, one-way technology, applied in the field of ultra-fine metal nickel powder preparation equipment, can solve the problems of cohesive loss, poor fluidity of ultra-fine nickel powder, etc., achieve sufficient gas-solid contact, fast reaction rate, and low reaction temperature Effect

Active Publication Date: 2012-07-04
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 problems of poor fluidity, cohesive loss and industrial scale-up of ultrafine nickel powder, and proposes a continuous preparation process for ultrafine nickel metal powder

Method used

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  • Device and method for preparing superfine nickel powder
  • Device and method for preparing superfine nickel powder
  • Device and method for preparing superfine nickel powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 Shown, a kind of device for preparing superfine nickel powder comprises the screw feeder 2, cyclone preheater 3, fluidized bed reactor 5 and fluidized bed cooler 7 of the hopper 1 connected successively and hopper 1 below; The outlet of the fluidized bed reactor 5 is connected with a combustion chamber 11, and the outlet of the combustion chamber 11 is connected with the cyclone preheater 3.

[0033] A first cyclone separator 9 is provided between the fluidized bed reactor 5 and the combustion chamber 11 .

[0034] The fluidized bed cooler 7 is provided with a circulating water cooler 8, and a high-pressure carrier gas inlet is provided below, and the outlet is connected to the second cyclone separator 10; the outlet of the second cyclone separator 10 communicates with the combustion chamber 11 and is connected to the fluidized bed Reactor 5 is connected.

[0035] The top of the cyclone preheater 3 is connected with the cyclone dust collector 12 and t...

Embodiment 2

[0038] Such as figure 2 As shown, the feed port 5-6 of the countercurrent fluidized bed reactor is on the top, and the discharge port 5-7 is on the bottom, forming an angle of 40° with the vertical direction. A guide tube 5-1 is arranged inside, and a first carrier gas inlet 5-3 is provided under the guide tube 5-1; a second carrier gas inlet 5-4 is provided under the counterflow fluidized bed reactor, and a gas carrier inlet 5-4 is arranged on it. Distributor 5-5; a transverse baffle 5-2 is set in the annular area between the guide tube 5-1 and the reactor wall; the transverse baffle 5-2 is 5° to the horizontal direction; the transverse baffle 5-2 There is a small hole on the top, and the diameter of the hole is 2.0mm.

Embodiment 3

[0040] The feed port 5-6 of the countercurrent fluidized bed reactor is on the top, and the discharge port 5-7 is on the bottom, forming an angle of 25° with the vertical direction. A guide tube 5-1 is arranged inside, and a first carrier gas inlet 5-3 is provided under the guide tube 5-1; a second carrier gas inlet 5-4 is provided under the counterflow fluidized bed reactor, and a gas carrier inlet 5-4 is arranged on it. Distributor 5-5; a transverse baffle 5-2 is set in the annular area between the guide tube 5-1 and the reactor wall; the transverse baffle 5-2 is 30° to the horizontal direction; the transverse baffle 5-2 There is a small hole on it, and the diameter of the hole is 0.05mm.

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Abstract

The invention relates to a device and a method for preparing superfine nickel powder. The device comprises a feeding system, a preheating system, a fluidized bed reactor and a cooling system which are sequentially connected. An outlet of the fluidized bed reactor is connected with a combustion chamber. An outlet of the combustion chamber is connected with the preheating system. After entering a cyclone preheater through the feeding system to be preheated, superfine nickel oxide enters the fluidized bed reactor to be subjected to the reduction reaction; and then the product is discharged after entering the cooling system. High temperature tail gas exhausted from the outlet of the fluidized bed reactor enters the combustion chamber to be burnt after being separated by a first cyclone separator. One path of tail gas is supplied to the preheating system and the other path of tail gas carries out heat exchange with carrier gas exhausted by a second cyclone separator and is supplied to the fluidized bed reactor through a first carrier gas inlet. The invention can solve the problems of poor fluidity, bonding defluidization and industrial scale-up of the superfine nickel powder. The preparation process is simple. The reaction temperature is low. The heat utilization rate is high. The continuous industrial scale production can be implemented.

Description

technical field [0001] The invention belongs to the technical field of ultrafine powder preparation, and relates to an ultrafine metal nickel powder preparation device and method. Background technique [0002] The industrialized batch production technology of ultrafine metal nickel powder is the frontier topic and development direction in the field of ultrafine metal powder preparation. Ultrafine nickel powder (particle size<1μm) has great surface effect and volume effect, and has unique physical and chemical properties in magnetic properties, sintering activity, and catalytic performance. It has broad application prospects in magnetic materials, battery negative electrode materials, powder metallurgy and other fields. [0003] At present, the preparation methods of ultrafine nickel powder are divided into physical methods and chemical methods. Physical methods include evaporation-condensation method and mechanical pulverization method; chemical methods include: reductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 朱庆山李军李洪钟张涛余斌彭练
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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