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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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  • Claims
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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 intermittent discharging, and the operation is difficult, and the conditions for controlling the grain size are difficult to grasp.

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

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Experimental program
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Effect test

specific Embodiment approach ) Embodiment 1

[0022] (specific implementation) the preparation of embodiment 1 superfine nickel powder

Embodiment 2

[0023] 20 kg nickel sulfate NiSO 4 ·6H 2 O was dissolved in deionized water to form a solution of 150 liters, which was heated to 80 °C and labeled as solution A. 9 kg of hydrazine and 4.8 kg of sodium hydroxide were dissolved in deionized water to form a solution of 150 liters, labeled as solution B. Solution A and solution B are added respectively in the reactor of the present invention with the flow rate of 1.25 liters / minute with metering pump. The temperature in the reactor was controlled to 80°C by passing constant temperature water through the jacket, and the stirring speed was 700 rpm. The temperature of the crystal growth tube is controlled at 60°C. 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 feed pipe enters the product receiving tank, and is filtered, washed and dried to obtain...

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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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