Rotary Kiln

Introduction: 

Rotary kiln generally refers to rotary calcining kilns, belonging to the building materials equipment. 

Based on the materials they process, rotary kilns can be divided into cement kilns, metallurgical and chemical kilns, and lime kilns. 

1. Cement kilns are mainly used for calcining cement clinker, and are divided into two main categories: dry-process cement kilns and wet-process cement kilns. 

2. Metallurgical and chemical kilns are mainly used in the metallurgical industry for magnetizing and roasting lean iron ore in steel plants; oxidizing and roasting chromium and nickel iron ore; roasting high-alumina vanadium ore in refractory material plants and roasting clinker and aluminum hydroxide in aluminum plants; and roasting chromite sand and chromite powder in chemical plants. 

3. Lime kilns (i.e., active lime kilns) are used for roasting active lime and lightly calcined dolomite for steel plants and ferroalloy plants.

Features:

Rotary kiln has a simple structure, convenient and reliable production process control, few vulnerable parts, and high operating rate. It is now widely used in the heating and calcination processes of small and medium-sized lime, aluminum powder, metallic magnesium, bauxite, alumina, aluminum hydroxide, cement, and various other materials, as well as in the processing of medical waste, chemical waste, and soil improvement. Our factory's rotary kilns have a reasonable and robust structure, operate smoothly, and produce high-quality products.

Working principle:

The rotary kiln is a cylindrical vessel, inclined slightly to the horizontal, which is rotated slowly around its axis. The material to be processed is fed into the upper end of the cylinder. As the kiln rotates, the materials gradually move down towards the lower end, and may undergo a certain amount of stirring and mixing. Hot gases pass along the kiln sometimes in the same direction as the process material (co-current), but usually in the opposite direction (counter-current). The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. Such a flame is projected from a burner-pipe (or 'firing pipe') which acts like a large burner. The fuel may be gas, oil or pulverized coal.

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