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Zinc residue and zinc ash

Source:    Time: 2016-12-16

1,Zinc residue

Due to liquid zinc in the surface of the diffusion to be plated to form a different thickness of the alloy layer, the iron-zinc alloy layer is called the slag layer. Throughout the hot-dip galvanizing process, due to continuous immersion plating, zinc bath also contains a certain amount of slag. When the inner wall of the zinc pot is subjected to thermal shock or mechanical shock, the thicker slag layer is stripped from the pot wall and deposited on the bottom of the zinc pot. There is also a part of the formation of zinc dross due to the reaction of zinc and iron salts caused by, for example, pickling or help plating to bring the iron salt, and the auxiliary plating process itself also play a certain pickling effect, so the plating process Also produce a small amount of iron salt; so dip zinc and iron salt reaction will also form dross. Because the density of zinc dregs is greater than that of liquid zinc, the zinc dross accumulated at the bottom of the zinc pot is periodically removed. Because of the high content of renewable materials in zinc dross, such as zinc dross in the zinc content of up to 95% -98%, so the zinc residue is usually delivered to the zinc smelter processing. Dross is very suitable as a secondary raw material for the recovery of zinc production.

2, zinc ash
Hot-dip galvanizing, the zinc bath surface will produce zinc ash. Zinc ash is essentially a solid compound formed by dry galvanizing because its specific gravity is lower than that of zinc and floating on the zinc bath surface. When the liquid zinc in contact with oxygen in the air and liquid zinc and the surface of the workpiece to help the coating reaction, will produce zinc ash. Its main components are zinc oxide and zinc chloride. Aluminum oxide is also included in the zinc dust produced by the aluminum-zinc alloy bath. The zinc dust on the surface of the zinc pot is removed by scraping or scraping the surface of the zinc pan before it is immersed in the zinc bath. When zinc dust is removed from the surface of the zinc pot, the removed zinc dust contains a large amount of zinc, usually having a zinc mass fraction of 80% to 90%. Due to its high zinc content, zinc ash is usually delivered to the smelter as a recycled material for smelting. As of October 2007, zinc ash has been considered non-hazardous waste and classified as green waste; however, since November 2007, changes in the zinc compound assessment have also resulted in changes in zinc ash classification .
Zinc ash can be renewable raw materials, a large number of bad for the production of zinc and zinc products.

The zinc ash recovery furnace produced by our company is convenient for operation and easy to learn. It can effectively recover the zinc component in zinc ash. The recovery rate of zinc ash is 60-75%, and the cost of recovering one ton of zinc ash is only 100-200 yuan. Equipment, automatic operation, without care, recycling a ton of zinc ash generally takes 3-4 hours. Effective savings of zinc consumption, while eliminating the workers to play when the ash is not controllable state. Effective to reduce the cost of galvanized, galvanized plant is popular in foreign recycling means, a large number of equipment exported to foreign countries.