Manufacturing Methods of Zinc Powder
I. Introduction
Zinc powder has an important application value in the field of raw materials for the production of chemicals, especially in the fields of antirust, coatings, plastics and so on. In order to meet the demand for zinc powder properties in different fields, it is crucial to study the manufacturing methods of zinc powder. In this paper, we will introduce the manufacturing methods of zinc powder in detail, including physical method, chemical method and physicochemical method, and analyze the advantages and disadvantages of various methods, in order to provide theoretical guidance for the production of zinc powder.
II. Physical manufacturing method of zinc powder
1. Ball milling method: zinc ingot is added into the ball mill, through the rotation of the ball mill and the impact of the ball milling medium, the zinc ingot is crushed into zinc powder. The advantage of this method is that the process is simple and low cost, but the product particle size distribution is wide, and the fineness is difficult to control.
2. Gas atomization method: the molten zinc through the nozzle sprayed into the high-speed airflow, so that the zinc by the shear force of the airflow and the cooling effect and broken into small droplets, and in the air quickly solidified into zinc powder. The advantage of this method is that the product particle size is fine and uniformly distributed, but the equipment investment is larger and the energy consumption is higher.
Third, the chemical manufacturing method of zinc powder
1. Reduction method: zinc salt solution by adding reducing agent (such as sodium hydroxide, calcium hydroxide, etc.), so that the zinc ions are reduced to metallic zinc, and precipitation precipitation. The advantage of this method is the high purity of the product, but the process conditions are difficult to control, easy to produce slag waste water. Electrolysis: Zinc salt solution is used as electrolyte, and metal zinc is precipitated on the cathode through electrolysis. The advantage of this method is the high purity of the product, fine particle size, but higher energy consumption, equipment maintenance costs.
Four, the physical and chemical manufacturing methods of zinc powder
1. Plasma method: using the high energy density and high temperature characteristics of the plasma, so that the zinc atoms in the gas are ionized and deposited on the collection plate to form zinc powder. The advantage of this method is fine particle size and high purity of the product, but the equipment investment is large and the operation cost is high.
2. Laser method: The high energy density of the laser beam is used to irradiate the zinc target material, so that the surface of the zinc target material is rapidly melted and evaporated, and at the same time, the zinc powder is condensed into zinc powder under the protection of inert gas. The advantage of this method is that the product particle size distribution is narrow, high purity, but the equipment cost is high, low production efficiency.
V. Comparison of the advantages and disadvantages of various manufacturing methods
Physical manufacturing methods have the advantages of simple process, low cost, but the product particle size distribution is broader, fineness is difficult to control; chemical manufacturing methods can be obtained from the high purity products, but the process conditions are more difficult to control, and may produce slag wastewater; physical and chemical manufacturing methods can be obtained from the high purity, fine-grained products, but the investment in equipment is large, and the operating costs are high. Therefore, when choosing the manufacturing method of zinc powder, it is necessary to make comprehensive consideration according to the specific product requirements and production costs.
VI.Conclusion
There are various manufacturing methods for zinc powder, including physical method, chemical method and physical-chemical method. Various methods have their advantages and disadvantages, which need to be considered comprehensively according to specific product requirements and production costs. In the future, with the continuous progress of science and technology and the improvement of environmental protection requirements, the manufacturing methods of zinc powder will continue to develop and optimize, providing more high-quality zinc powder products for the field of raw materials for chemical production.
