Technique for continuously preparing super fine nano powder by using precipitation method and its specialized equipment

A technology of ultra-fine nano and special equipment, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of difficult control of grain size and difficult operation

Active Publication Date: 2003-10-08
NANJING UNIV OF TECH
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Problems solved by technology

However, the reactors described in these reports belong to the semi-continuous operation of continuous feeding and intermit

Method used

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  • Technique for continuously preparing super fine nano powder by using precipitation method and its specialized equipment
  • Technique for continuously preparing super fine nano powder by using precipitation method and its specialized equipment
  • Technique for continuously preparing super fine nano powder by using precipitation method and its specialized equipment

Examples

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Example

[0022] (Specific embodiments) Example 1 Preparation of ultrafine nickel powder

Example

[0023] 20 kg nickel sulfate NiSO 4 ·6H 2 O was dissolved in deionized water to form 150 liters of solution, heated to 80°C, and labeled as solution A. 9 kg of hydrazine and 4.8 kg of sodium hydroxide are dissolved in deionized water to form a 150 liter solution, which is labeled as solution B. The solution A and the solution B were added into the reactor of the present invention with a metering pump at a flow rate of 1.25 liters / min. The temperature in the reactor is controlled to 80°C by passing constant temperature water through the jacket, and the stirring speed is 700 rpm. The temperature of the crystal nucleus growth tube is controlled at 60°C, and the ammonia and nitrogen generated by the reaction are introduced into the ammonia absorption device through the vent tube, and the nitrogen is evacuated after the ammonia is absorbed. The nickel powder suspension flowing out of the guide tube enters the product receiving tank, and is filtered, washed, and dried to obtain the produ...

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Abstract

A process for continuously preparing nano powder by deposition method includes quantiatively and proportionally feeding raw materials in reactor at a certain speed, stirring while nucleating reaction, quickly coming in crystal nuclear growing tube, moving forward under the action of mixer, collecting suspension at tube end, and drying. Its advantages are controllable granularity, high dispersity and uniformity, and high productivity.

Description

(technical field) [0001] The invention relates to a preparation method of ultrafine powder, in particular to a process for continuously preparing ultrafine nano powder by precipitation method and special equipment for the process. (Background technique) [0002] Ultrafine nanopowder refers to fine powder with a particle size between 1 and 1000nm. Due to its surface effect, quantum size effect and macroscopic quantum tunneling effect, ultrafine nanopowders have unique mechanical, electrical, magnetic, thermal, optical and chemical properties, making them widely used in many fields such as catalysis, pigments and composite materials. Has a wide range of applications. Therefore, as an important link in the research and development of nanotechnology, the preparation technology of ultrafine nanomaterials has attracted more and more attention. In order to realize the scale of nanomaterials industry, it is very important to prepare high-quality ultrafine nanopowders whose particl...

Claims

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Application Information

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IPC IPC(8): B22F9/24C01F11/16C04B35/624
Inventor 徐南平陈洪龄杜艳
Owner NANJING UNIV OF TECH
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