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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 nanometer and special equipment, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of difficult operation and difficult to grasp the conditions for controlling the grain size.

Inactive Publication Date: 2005-06-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The preparation of embodiment 1 ultrafine nickel powder

[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 p...

Embodiment 2

[0024] Embodiment 2 Preparation of ultrafine barium sulfate powder

[0025] 315 liters of aqueous solution of sodium sulfate with a concentration of 1.5 mol / liter, heated to 40°C, marked as solution A. 210 liters of aqueous solution of barium sulfide with a concentration of 0.75 mol / liter, heated to 40°C, marked as B. Solution A is with the flow of 3 liters / minute with metering pump, and solution B is added in the reactor of the present invention with the flow of 2 liters / minute respectively. The temperature in the reaction kettle was controlled to 40°C by passing constant temperature water through the jacket, and the stirring speed was 500 rpm. The temperature of the crystal nucleus growth tube is controlled at 40°C. The barium sulfate suspension flowing out from the feed pipe enters the product receiving tank, and is filtered, washed and dried to obtain the product. The reaction was carried out for 1 hour and 40 minutes to obtain about 35 kilograms of superfine barium sul...

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Abstract

The invention relates to a process for continuously preparing superfine nano-powder by precipitation method. In this process, materials are fed to a reaction kettle at a certain ratio and speed through a metering and feeding device at the same time. , quickly enters the crystal nucleus growth tube, advances under the action of the material mixing device, and finally collects the suspension at the tube end outlet of the crystal nucleus growth tube and obtains ultrafine nano-powder after proper drying. The control of the grain size is realized by adjusting the temperature of the reaction kettle and the crystal nucleus growth tube, the proportion of the reaction materials, the feeding speed, the stirring speed and other control factors. The present invention can make the precipitation reaction proceed continuously, and the productivity is high; at the same time, the nucleation process and the growth process in the precipitation reaction are separated, and the nucleation and growth are formed in a relatively stable environment, and the particle size of the generated particles can be regulated, and the single particle size Good dispersibility, narrow distribution and small difference in morphology. The invention also provides special equipment for the new process.

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 particle si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24C01F11/16C04B35/624
Inventor 徐南平陈洪龄杜艳
Owner NANJING TECH UNIV
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