Zinc oxide calcination kiln manufacturer in China

Zinc oxide calcination kiln manufacturer in China

Introduction of zinc oxide:

Zinc oxide also called zinc white or zinc oxide powder, always dispersed in rubber and latex, it is reinforcing agent, active agent and

vulcanizing agent for natural rubber, synthetic rubber, it is also coloring agent and filler for white plastic materials.

Zinc oxide calcination kiln production line:

First, crushing zinc furnace materials and coking coal into pallets less than 40 mesh, zinc furnace materials and coke mixed together

 in proportion to 1:0.30-0.35.

Second, making the mixed materials into particle mixture, diameter is 8-15 mm and finally the mixed pellets enter into rotary kiln for

 smelting. 

Third, Zinc oxide ore or zinc-containing industrial slags(zinc-containing is 15%25%) calcining for producing zinc oxide, coke or coal can be saved significantly.

Fourth, zinc oxide obtained by smelting has advantages of high output, high quality, a small amount of nodulation.

Zinc oxide calcination kiln technical parameter:

During the EAF process, the high temperatures required to melt the feed material produce a zinc byproduct (EAF dust) that leaves the furnace along with the off-gases. The gases are filtered and the EAF dust is collected in bag houses.

The EAF dust waste steam is considered a hazardous material due to the potential for the heavy metals to leach into the ground, contaminating ground water and sewage systems.
The EAF dust generated by steel mills can be recycled in an economically viable way using the Waelz Kiln technology. The recycling process is part of the larger steel industry loop that allows the reuse of two important natural resources - zinc and iron.

Waelz Zinc Oxide is the main product of recycling EAF dust utilizing the Waelz Kiln technology. This product is sold to zinc smelters as an alternative to traditional zinc concentrates from mines. The zinc smelters produce pure zinc ingots or other high purity zinc products that are either sold to the steel industry for galvanization purposes or sold to other end-users for pigments, tires, chemicals or medicines.

(1) EAF steel dust is transported by road or rail to a steel dust recycling plant.
(2)The feed materials are provided in either dry compact-moist or pelletized form. The compact and pelletized moist materials, coarse fluxes and coke are stored in boxes while the dry dust is transported by pneumatic conveying systems to raw material silos.
(3)Typically 55 meters long with a four-meter diameter, the Waelz Kiln is slightly inclined 2-3% and has an approximate rotary speed of 1.0 rpm. As the moist material moves through the rotary kiln, it is dried and preheated by the kiln gas, flowing in a counter-current pattern. In the reaction zone, reduction of the metal oxides occurs around 1200°C as the zinc is vaporized as metal vapor into the gas cleaning system. Zinc is then re-oxidized in the kiln atmosphere that is operated with excess air (process air is injected from the kiln end). Chlorine and alkalis volatilize jointly with the heavy metals and the dust-laden off-gas is treated in a downstream off-gas system.
(4B)In the first stage, coarse particles mechanically entrained are separated in a dust settling chamber and returned to the kiln. The hot, dust-laden off-gas is cooled and Waelz Zinc Oxide is separated in a high efficiency collector.
(4A) The co-product, Waelz Iron Product, can be used directly in road construction, civil construction (backfilling), cement manufacturing or can be reprocessed to add more value to the iron content which is currently under research and development.
(5)The dust-free off-gas is then treated, filtered and discharged.
(6) The discharged air easily meets strict environmental regulatory standards
(7) Waelz Zinc Oxide, the main product of the process, is delivered to zinc smelters for zinc production.

Application of zinc oxide:

1. After adding the zinc oxide into rubber, it can make the rubber have excellent wear-resisting, tear-resisting and flexibility.
2. As a kind of white dyestuff, because of the active zinc oxide has excellent activation performance, it has been utilized more and

more widely in rubber products. For example, in the V type belt, it can not only take the place of common zinc oxide and it can

 reduce more than a half to one third of the using quantity which can make various performance and index of the rubber stable and make curing properties not be influenced so as to reduce the cost.

3. The fine grained zinc oxide can be used as medicine.
4. Due to the strong ability of absorbing the ultraviolet rays, more and more people use it to color the paint, printing ink and varnished cloth.
5. The zinc oxide also can be used to fields like press -sensitive, photocatalysis, photoelectrode, paint, and color developing areas, etc.

Zinc oxide calcination kiln application:

Zinc oxide calcination kiln is a key equipment for treatment of Zn from Zinc smelters or steel mill dust, EAF dust, low grade zinc ore etc.

If you are interested in our Zinc oxide calcination kiln, pls kindly inform us the following info:

1. what is the raw material that you are going to process?

2. what is the capacity?

3. what is the feeding size of raw material?

4. what is your heat source?