Preparation method of high-purity zinc powder

A zinc powder and high-purity technology, which is applied in the field of preparation of high-purity zinc powder, can solve the problems of coal-burning environmental pollution, large fluctuations in furnace temperature, and unstable calorific value of gas, and achieve the effect of high purity and high combustion efficiency

Active Publication Date: 2011-04-27
JIANGSU YEJIAN ZINC IND CO LTD +1
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AI Technical Summary

Problems solved by technology

[0003] Although electricity is used as a heating source in the prior art, although it will not cause pollution, and it is easy to control the furnace temperature, thereby producing higher-purity zinc powder, the disadvantage is that the cost is high, and it is suitable for small-scale production and very high product profits. use in the case of
The disadvantage of using coal as an energy source is that coal will produce a large amount of coal tar, which will affect full combustion, poor furnace temperature control accuracy, resulting in large fluctuations in furnace temperature, and a high degree of oxidation of zinc powder, low production efficiency, and is not suitable for large-scale production. Large-scale high-purity zinc powder production process
In addition, coal burning also pollutes the environment, requiring a certain investment to solve the emission of dust and smoke pollution
However, using coal gas as an energy source, because the gas contains a certain amount of fly ash and coal tar, it is easy to cause pipeline blockage, and the calorific value of the gas is unstable, resulting in unstable temperature during combustion, which will also cause large fluctuations in furnace temperature, and zinc The degree of powder oxidation is high, the production efficiency is low, and it is not suitable for large-scale high-purity zinc powder production process

Method used

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  • Preparation method of high-purity zinc powder

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Experimental program
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Effect test

Embodiment 1

[0020] Turn on the natural gas heating source, preheat the zinc melting furnace, raise the furnace temperature to 450°C, put in zinc ingots, and continue heating the zinc melting furnace. When the furnace temperature rises to about 520°C, the zinc ingots will melt into zinc Water; then lead the zinc water into the reverberatory furnace, turn on the natural gas heating source, control the temperature of the molten pool at about 500°C, and let it stand for 24 hours to achieve the stratification of the melt, and the upper layer is the refined zinc from the melt; remove the floating water on the surface of the molten pool slag; put the melt refined zinc obtained by layering into the lead tower holding furnace for preservation, the temperature is controlled at 630°C, and keep warm for 5 hours; then the melt refined zinc is introduced into the lead tower, and the temperature of the lead tower combustion chamber is controlled at about 1200°C , so that the zinc and cadmium in it are se...

Embodiment 2

[0022] Turn on the natural gas heating source, preheat the zinc melting furnace, raise the furnace temperature to 500°C, put in zinc ingots, and continue heating the zinc melting furnace. When the furnace temperature rises to about 580°C, the zinc ingots will melt into zinc water; then lead the zinc water into the reverberatory furnace, turn on the natural gas heating source, control the temperature of the molten pool at about 460°C, and let it stand for 36 hours to achieve the stratification of the melt, and the upper layer is the refined zinc from the melt; remove the floating water on the surface of the molten pool slag; put the melted refined zinc obtained by layering into the lead tower holding furnace for preservation, the temperature is controlled at 600°C, and keep warm for 4 hours; then the melted refined zinc is introduced into the lead tower, and the temperature of the lead tower combustion chamber is about 1100°C. The zinc and cadmium in it are separated from the hi...

Embodiment 3

[0024] Turn on the natural gas heating source, preheat the zinc melting furnace, raise the furnace temperature to 480°C, put in zinc ingots, and continue heating the zinc melting furnace. When the furnace temperature rises to about 550°C, the zinc ingots will melt into zinc Then lead the zinc water into the refining furnace, turn on the natural gas heating source, control the temperature of the molten pool at about 480°C, and let it stand for 30 hours to achieve the stratification of the melt, and the upper layer is the refined zinc from the melt; remove the floating slag; put the melt refined zinc obtained by layering into the lead tower holding furnace for preservation, the temperature is controlled at 580°C, and keep warm for 3 hours; then the melt refined zinc is introduced into the lead tower, and the temperature of the lead tower combustion chamber is about 1150°C. The zinc and cadmium in it are separated from the high boiling point impurities lead and iron; the zinc and ...

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Abstract

The invention provides a preparation method of high-purity zinc powder. In the method, clean energy natural gas is taken as a heating source to heat and melt zinc for a zinc melting furnace. The temperature of the zinc melting furnace is controlled between 520 DEG C to 580 DEG C, zinc fluid is then introduced to a reverberatory furnace or a refining furnace, and the heating source of the natural gas is turned on to 460 DEG C to 500 DEG C, and then, stands for 24 to 36 hours until melt is layered. The upper layer of the melt is melt refining zinc. After then, the melt refining zinc passes through a lead tower and a cadmium tower respectively to realize the separation of zinc and impurity elements. At last, zinc vapor is introduced into a condenser for rapid cooling, and the zinc vapor is changed into the zinc powder to fall into a powder hopper, and then, the zinc power passes through a mixer and a grader to obtain finished product, i.e. high-purity zinc powder. The cleaning method can be used for preparing the high-purity zinc powder, of which the zinc content is higher than or equal to 99.99wt%, and the high-purity zinc powder can reach the standards of the high-purity zinc powder of zinc-1 and zinc-0 brand. The invention has the advantages of simple process, easy control of furnace temperature and high production efficiency, which is especially suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy industry, and particularly relates to a preparation method of high-purity zinc powder (zinc content ≥ 99.99 wt%). Background technique [0002] Zinc powder is an important industrial raw material with great market demand. It is widely used in metallurgy, chemical industry, construction, transportation, medicine, electronics and other fields. The production methods of zinc powder include atomization method and evaporation condensation method. Preparation of zinc powder by atomization methods, such as air jet atomization and hydraulic jet atomization, has low product recovery rate, high power consumption, and problems such as uneven particles. At present, the method of domestic industrialized production of zinc powder is mostly based on the evaporation condensation method, with coal, gas or electricity as the energy source, and the zinc ingot is heated and melted by the zinc melting furnace unti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/12C22B19/32
Inventor 史建群史优良丁伟文黄秉慧张出波赵秋平
Owner JIANGSU YEJIAN ZINC IND CO LTD
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