Rotary dryers,Rotary kiln

Sponge Iron Rotary Kiln is a direct reduction equipment which smelt iron ore into iron directly through solid-phase reduction reaction. It is also called direct reduction process with rotary kiln.

Sponge Iron Rotary Kiln is a continuous running cylindrical high-temperature reactor lined with refractory materials inside. It is placed on several sets of supporting rollers and slightly inclined to horizontal level. During operation, iron ore (lumps, pellets) with certain size, part of reduced coal (including return char) and desulfurizer are continuously added to kiln in certain proportion from feeding end (tail end). Along with kiln's rotation (0.5 to 1.2r/min), materials are brought up to a certain height by friction force and rolled down due to gravity. At the same time, materials will moves a small distance to the kiln discharge end (lower end). 

There is also a reduced coal injection device kiln discharging end. Reduced coal with suitable particle size is fed into the kiln by high-pressure air. Adjusting the amount of sprayed air can effectively control the injection distance and distribution. Air suppling pipe installed along with discharge end and kiln body extend into kiln and send air (primary air and secondary air), which makes volatiles released by reduced coal, CO and carbon produced by reduction reaction in the kiln are burnt.If heat is insufficient, a pulverized coal burner can be added to kiln head to supplement it. Materials are gradually heated by reverse hot air flow during forward movement so that to complete drying, preheating, carbonate decomposition, desulfurization, Sponge Iron (or other element) reduction and carburization reactions. Generally speaking, iron ore will be transferred into sponge iron after stay for 8 to 10 hours in kiln under 950 to 1100℃.