Preparation method of sub-micron zinc powder and preparation device thereof

Abstract

The invention relates to a preparation method of sub-micron zinc powder and a preparation device thereof. The preparation method comprises the following steps: heating and melting high-purity zinc ingot metal in a melting liquating furnace (11) to separate out zinc liquid with high zinc content; forming zinc steam; introducing the zinc steam to a condenser (5) by a gas-guide pipe to be coated andscattered by inert gases; attracting condensed sub-micron level or nano level zinc powder particles and aerosol formed by the inert gases in the condenser (5) to a condensate cyclone separator (4) and a filter through an exhaust fan under the protection of the inert gases; and carrying out finished product packaging at last. The invention also provides a device used for preparing the sub-micron zinc powder. A gas supply station (14) is sequentially communicated with the melting liquating furnace (11), an evaporation pond (9), the condenser (5), the condensate cyclone separator (4) and a cooling pond (3), an inert gas jet pipe is distributed at of the joint of a zinc steam pipe (8) and the condenser (5), and a switch valve II (7) is connected between a gas outlet of a gas storage tank (1) and the inert gas jet pipe.

Description

Technical field [0001] The invention relates to a method for preparing submicron zinc powder and a preparation device thereof. Background technique [0002] At present, the evaporation-condensation method is mainly used for ultrafine zinc powder at home and abroad. The process flow is as follows: zinc ingot melting (420℃)→evaporation (above 1000℃)→condensation into ultrafine particles, which uses the low boiling point of zinc (419.4 ℃), high vapor pressure (1.759×10 3 ) Characteristics. Zinc is heated to above 1000°C under normal pressure to vaporize (boiling point 907°C). The zinc vapor is introduced into a closed container isolated from air and quickly condenses into high-purity zinc powder. The obtained zinc powder is average The particle size is mostly above 5μm. The metallurgical furnaces used in this method mainly include tower furnaces and horizontal furnaces. (1) Tower furnace method: This method uses B # Zinc or crude zinc with low cadmium content is used as a raw mate...

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Problems solved by technology

The main disadvantages of this method are: ①The production process is carried out intermittently. The graphite crucible needs to be heated up to the end of evaporation and then cooled to 400°C. After adding zinc, the temperature is raised to above 900°C to evaporate the zinc liquid. Cooling-reheating will increase the energy consumption, and after the production of each furnace of ultra-fine zinc powder is completed, the zinc powder in the stocker must be cooled and shut down to collect the zinc powder in the stocker, and then start another cycle operation, and the production cannot be continuous;② This method is operated under negative pressure and has extremely strict requirements on equipment, resulting in difficult processing of equipment, high production costs, huge investment in equipment, and high production costs.

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