Zinc metal zinc powder is a form of superfine zinc powder has widely used in the production and living, especially in the mercury-free batteries, have chemical industry, dye, medicine, pesticide, paint, paint, insurance powder, lithopone, electronics and food industry, etc., zinc powder zinc prices slightly lower than normal, and the advantage of price makes the zinc powder market demand is strong. So the production of epoxy zinc rich zinc powder problems become to be solved urgently.
There are three ways in the production of zinc powder, namely, atomization method (conventional atomization method and composite atomization method), distillation condensation method and electrolysis method.
Atomization method is melt the metal zinc and overheating to about 660 ℃, the high pressure gas medium liquid zinc into tiny metal powder. Atomization method production process simple, easy to operate, low cost, high productivity, but conventional atomization method zinc powder average particle size is larger, fine powder productivity is low.
Distillation condensation method is heated to above 1000 ℃, the metal zinc from zinc vapor, and then the zinc powder obtained from the condensation method, the production of zinc powder has good activity, but the process of raw material requirement is higher.
Electrolytic process in the production of zinc powder generally larger than the surface area, good activity, but due to reasons such as environmental protection, at present there is few application.
Because zha production of zinc powder atomization method has many advantages, and disadvantages, the traditional atomization method developed on the market all kinds of composite atomization process, the atomization efficiency greatly improved, fine powder increased productivity. Among the more prominent is the multistage atomization process, the process of 10 ~ 20 um flour extraction rate as high as 90% above. Multistage atomization process is divided into the following two phases: phase 1 for ordinary gas atomization, high-speed airflow and metal flow, to break it into small droplets. Phase 2 for impact atomization and centrifugal atomization, high-speed gold with droplet impact in the rotating device, forming secondary or atomization for many times. Multistage atomization powder exist in the process of droplet multiple branching processes such as crushing, heat transfer, droplet solidification, they coexist in the system, at the same time, influence each other, determine the powder particle size and microstructure.
This method is a little bit complicated, however, are more strict to the requirement of process, the resulting zinc powder has a high quality, belong to one of the most commonly used method of zinc powder production.