zinc oxide waelz kiln introduction
-china henan zhengzhou mining machinery co.,ltd
The bended materials are feeding into rotary kiln by belt conveyor. Because there is coal added in the blended materials, when the materials are moving to the kiln end , the coal is burning and creating heat, so, the materials temperature is getting higher and higher. At the temperature of 1150+/50 , with help of coal as reducing agent, the valuable metals such as Zn, Pb etc will be reduced and volatilized as metal Vapor into the dust collecting system.
Magnetizing Roasting is heating the ore up to certain temperature to create physical and chemical reaction under the reducing agent. With this process, the magnetic property of iron minerals will be significantly enhanced, however, for the magnetic property of gangue minerals, there is no change . Therefore, various weakly magnetic minerals can be efficiently separated after Magnetizing Roasting process. For this Magnetizing Roasting process, rotary kiln is the key equipment for it.
The Fe in EAF Dust is existing in mineral form of iron oxide (Fe2O3 or FeO) which is one kind of weakly magnetic strength, it is hard to be separated with normal magnetite separation process. For this kind of ore, we suggest Magnetizing Roasting process plus grinding process and magnetic separation process to get the final high grade of Fe concentrate.
At the kiln head, there is water cooling pool. The metalized kiln slag is directly discharged into water pool for cooling (avoiding direct contact with air to create secondary oxidation), and then is transported by loader to the stock yard for further process. The cooling water is entering to water recycling system.
The metalized kiln slag is transported into pit hopper by loader, and then sent to Vertical combination crusher by belt conveyor for crushing. The crushed metalized kiln slag is entering into Ball mill for grinding, and then entering into two-stage magnetic separators for separation, of which, one is for roughing (1800-2000GS), the other is for cleaning (1000-1200GS), then get final Fe concentrate (55-60% up).
FEECO is a leading manufacturer of highly engineered, custom rotary kilns for processing solids. Our high temperature kilns have earned a reputation for their durability, efficiency, and longevity. We offer both direct- and indirect-fired units.
Rotary kilns work by processing material in a rotating drum at high temperatures for a specified retention time to cause a physical change or chemical reaction in the material being processed. The kiln is set at a slight slope to assist in moving material through the drum.
Direct-fired kilns utilize direct contact between the material and process gas to efficiently process the material. Combustion can occur in a combustion chamber to avoid direct flame radiation, or the flame can be directed down the length of the kiln.
All FEECO equipment and process systems can be outfitted with the latest in automation controls from Rockwell Automation. The unique combination of proprietary Rockwell Automation controls and software, combined with our extensive experience in process design and enhancements with hundreds of materials provides an unparalleled experience for customers seeking innovative process solutions and equipment.
Indirect-fired kilns are used for various processing applications, such as when processing must occur in an inert environment, when working with finely divided solids, or when the processing environment must be tightly controlled.
Calcination refers to the process of heating a material to a temperature that will cause chemical dissociation (chemical separation). This process is used frequently in the creation of inorganic materials, for example, the dissociation of calcium carbonate to create calcium oxide and carbon dioxide.
Thermal desorption is also a separation process. This process uses heat to drive off a volatile component, such as a pesticide, from an inorganic mineral, such as sand. The component is vaporized at the increased temperature, causing a separation without combustion. In some cases, an indirect rotary kiln would be best for this application, because the volatile chemicals may be combustible. The indirect kiln will supply the heat for desorption, without the material coming into direct contact with the flame.
Organic combustion refers to the treatment of organic wastes with the intent of reducing mass and volume. Organic waste is treated in the kiln, leaving behind an ash with considerably less mass and volume. This allows for more efficient and effective deposit of waste materials into landfills.
Sintering is the process of heating a raw material to the point just before melting. This increases the strength of the material, and is commonly used in the proppant industry, where sand or ceramic materials are made stronger.
Heat setting involves bonding a heat resistant core mineral with another, less heat resistant coating material. Unlike an unheated coating process, here, a rotary kiln heats the coating material to just below liquefaction point, allowing it to coat the heat resistant core more evenly and more securely. This process is commonly seen in the manufacture of roofing granules, where a mineral such as granite is coated with a colored pigment, producing a product that is both durable and aesthetically pleasing.
Reduction roasting is the removal of oxygen from a component of an ore usually by using carbon monoxide (CO). The CO is typically supplied by mixing a carbonaceous material such as coal or coke with the ore or by feeding it separately. Examples are the reduction roasting of a hematite containing material to produce magnetite that can be magnetically separated. In the Waelz process, zinc oxide in steel mill wastes is reduced to metallic zinc and volatilized for recovery in the off-gas system.
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The advantages to a FEECO rotary kiln are that it is built to the highest quality standards and is backed by over 60 years of process design experience. The FEECO Innovation Center offers batch and pilot scale kilns that can simulate conditions in continuous commercial rotary kilns, allowing our customers to test small samples of material under various process conditions, as well as part of a continuous process. With options in both co-current and counter-current flow, and direct or indirect configurations, the FEECO test kilns offer a variety of options to suit your thermal testing needs. We also offer support equipment such as a combustion chamber, afterburner, baghouse, and wet scrubber for testing.