Sponge lron Kiln For Sale

Sponge lron Kiln Introduction

Sponge iron rotary kiln is a kind of industrial kiln specialized in direct reduction of iron ore to produce sponge iron. Sponge iron rotary kiln sends iron ore together with reducing agent (coal powder, natural gas, etc.) into the tilting and rotating high temperature kiln body, and under the high temperature reducing atmosphere, the iron oxides are gradually reduced to metallic iron (Fe), forming porous sponge iron. This equipment is characterized by continuous production, low energy consumption, strong adaptability of raw materials, etc. The sponge iron produced has less impurities and high metallization rate (usually ≥90%), which is the key raw material preparation equipment for short process steelmaking, powder metallurgy and high-quality steel production.

What is sponge iron? What are the uses?

Sponge iron is a high-purity, porous ferrous metal raw material made by reducing iron oxide in iron ores (such as hematite and magnetite) to metallic iron under high-temperature solid state conditions by direct reduction. Its porous structure (metallization rate ≥ 90%, iron content > 92%) and low sulfur and phosphorus characteristics make it a key material for the modern iron and steel industry to optimize the raw material structure.

The main roles of sponge iron include:

Hort process steelmaking: sponge iron has a purer composition and can provide a stable source of iron for steelmaking, replacing scrap steel or molten iron.

Powder metallurgy: sponge iron is crushed and made into iron powder, which has the advantages of high precision, high hardness, good abrasion resistance and corrosion resistance, etc. It is used to manufacture precision mechanical parts, automobile parts and other sintered products.

Castings production: sponge iron can be used as a carbonizer or alloy additive in casting production to enhance the strength and processing performance of cast iron, improve the quality of castings and reduce casting defects, such as porosity, inclusions, etc..

Environmental advantages: Compared with blast furnace ironmaking, sponge iron production process has lower carbon emission, which is in line with the trend of green metallurgy.

Used in water treatment: sponge iron has strong reducibility, it can reduce the high-value metal ions in the water to low-value metal ions, so that the formation of precipitation and be removed, but also to remove some of the organic matter and bacteria in the water.

Sponge lron Kiln Working Principle

Sponge iron rotary kiln is the key equipment for the production of sponge iron, which converts iron ore into sponge iron (DRI) through high temperature solid state reduction reaction.

The working process is as follows: firstly, the pre-treated iron-containing raw materials are mixed with a certain proportion of reducing agent (such as coal powder, etc.), and then enter into the tilted rotary cylinder from the end of the kiln, and under the joint action of high temperature and reducing agent, the iron oxides are gradually reduced to porous metallic iron (Fe₂O₃→Fe). The generated exhaust gas is treated and discharged through the dust collection device at the end of the kiln. The material moves forward slowly with the rotation of the kiln body, and after preheating, reduction and cooling sections, the sponge iron with high metallization rate (≥90%) is discharged from the kiln head, and the pure product is finally obtained through magnetic separation.

Sponge lron Kiln Structure

1. Auxiliary system
   Equipped with dust collector to prevent the exhaust gas from polluting the environment.DCS system can monitor the temperature, pressure and rotating speed in real time to adjust the combustion and feeding quantity.
2. Kiln body (cylinder)
   Usually 2.5-5 meters in diameter and 40-100 meters in length, made of heat-resistant steel plate rolled and welded, lined with refractory bricks that can withstand high temperatures above 1200°C. The kiln body is made of heat-resistant steel plate rolled and welded.
3. Drive system
   Equipped with main motor, reducer, large gear circle and pinion to control the kiln body to rotate stably. It can be equipped with diesel generator to prevent the kiln body from being deformed due to sudden power failure.
4. Supporting device
   There are 2-4 sets of pallets and rollers to support the weight of the kiln body and reduce the friction resistance, among which the blocking wheel set can prevent the kiln body from axial runout.
5. Sealing system
   The kiln head and kiln tail are sealed by fish scale sheet or cylinder compression type to prevent the entry of outside air (oxidation risk) and the spillage of dust inside the kiln.
6. Cooling and discharging device
   Cooling machine: single cylinder or grate cooler connected to the kiln head can cool the sponge iron quickly to avoid oxidation.

Sponge lron Kiln Operation Parameters