Indirect-fired Rotary Kiln Advantages

• Indirect-fired rotary kiln has high purity. Indirect way makes no contaminant and high purity of the product. The exhaust gas can be treated then discharged.
• Indirect-fired rotary kiln is suitable for the processing of powdery and granular materials.
• Indirect-fired rotary kiln’s calcination temperature is stable and easy to control. The cylinder is made of special stainless steel and the calcination temperature can reach 1150 °C. Moreover, the process parameters such as calcination temperature, calcination atmosphere, calcination time and calcination yield can be flexibly controlled.
• Indirect-fired rotary kiln body’s inclination and cylinder speed can conveniently and flexibly adjust. Automatic control ensures continuous and stable production and effective protection of the cylinder.
• The indirect-fired rotary kiln uses low operating costs. Waste heat can be fully utilized.
• Indirect-fired rotary kiln has clean combustion to meet environmental emission standards. It can be heated by natural gas, liquefied gas, coke oven gas, generator gas, diesel oil, and electricity, or it can be equipped with fuel and gas dual-use system.
• Indirect-fired rotary kiln has a wide range of applications. It is suitable for the combustion, roasting, incineration, decomposition, and drying of non-metallic minerals, metal mines, chemical products and agricultural products, such as coal kaolin, basic magnesium carbonate, magnesium hydroxide, magnesium chloride, 3A, 5A molecular sieve catalyst. , copper sulfate, barite, nickel oxide, titanium dioxide, zinc ore, sewage sediment, agricultural waste, and industrial waste.

Indirect-fired Rotary Kiln Prospect On Disposal Of Waste

Indirect-fired rotary kiln treatment of waste is a popular method of treating waste in recent years, but it is still rarely used in China. In fact, the use of indirect rotary kiln incineration to treat waste has been successfully practiced worldwide, showing great advantages in economics, prevention of secondary pollution, and thoroughness of waste innocuous treatment. Indirect-fired rotary kiln has so many advantages.

• Firstly, the temperature in the indirect rotary kiln is higher. The temperature of the furnace tube is between 1200-1300 ° C, and the temperature of the material is less than 1150° C.
• Secondly, the residence time of the flue gas in the indirect rotary kiln is longer, and the residence time is 4s at the temperature of the flue gas above 1100 ° C. Also, the material in the kiln is continuously suspended and tumbling, which is beneficial to the complete incineration of hazardous waste.
• Thirdly, the flammable part of the hazardous waste can be decomposed into harmless gas after being fully burned. The harmful dust in the flue gas is collected by the rotary kiln and after the treatment, dust can achieve safe discharge standards; the indirect rotary kiln can fix most of the heavy metals in the waste in the clinker to avoid re-diffusion. The residue of the incineration waste is mixed into the cement clinker and enters the final cement product, no longer creating secondary harm to the environment. Therefore, the use of an indirect rotary kiln for the disposal of hazardous waste is a thorough and economical method.

Kiln Operation Parameters