Activated carbon continues to attract interest as a way to produce a premium, marketable product from biomass waste. As a powerful adsorbent, the carbon-based material has been applied in everything from water treatment to gold recovery. The nascent nature of this industry, however, is leaving …
Reduction roasting is the removal of oxygen from a component of an ore, usually through the use of Carbon Monoxide (CO). The CO is typically supplied by mixing a carbonaceous material such as coke or coal with the ore, or by feeding it separately. An …
Incineration has become an essential tool in managing industrial and municipal wastes more sustainably, as long-landfilled materials such as hazardous medical wastes, petrochemicals, ammunitions, and more, have proven detrimental to the environment. While many types of incineration equipment exist, the rotary kiln, a diverse and …
This weekโs photo shows a rotary kilnโs leaf seals. The set-up consists of a series of overlapping spring steel plates that are attached to the housing, and ride on the rotating shell. Rotary kilns run at a higher temperature than the ambient air, thus any …
Variable Frequency Drives, or VFDs, are not a new technology, but only in recent decades have advancements in the field lowered many of the barriers associated with widespread VFD use, allowing their application in a range of settings. A recent market study anticipates that the …
Incinerators across the United States and abroad are preparing for a tidal wave of medical waste from the COVID-19 pandemic, with some countries already in the thick of it. As waste management companies prepare for the increased demand, weโve put together the list below on …
Thermal desorption is the process of using heat to drive off an organic chemical from an inorganic mineral. Unlike incineration, it is a separation process that relies on different reaction temperatures of absorbent minerals and chemicals. The organic chemical is vaporized at high temperatures, resulting …
The โworkingโ layer and insulating layer refer to a rotary kilnโs multiple layers of refractory. Refractory is what protects the kiln from high internal temperatures, and maintains heat retention. Sometimes it is desirable to use multiple layers of refractory, especially when higher efficiency is preferred, …
Sintering is the process of heating a material to a point just before melting via a rotary kiln. The objective here is to use the high internal temperature of the rotary kiln to increase the strength of the material. The most common use of this …
This weekโs photo highlights the interior of a batch rotary kiln. The rod-like structures at the bottom of the image (labeled โCโ) are two thermocouples. They are typically used in the kiln to measure bed and exhaust gas temperatures. The upper rod is an airline …