Sponge iron ore is one of the primary iron ores, which contains iron oxide with water as the main component and is a red natural multi-mineral deposit mixture. It has a low iron content, with a particle size of less than 10mm and a moisture content of less than 15% of hematite powder mixed with a portion of 0.8 coal powder into the reversing kiln.

The hematite ore completes the drying, magnetisation and desulphurisation process in the same reversing kiln with a reversing kiln speed of 0.8 rpm; the flame temperature and flame shape of the sponge iron rotary kiln should be adjusted frequently to meet the actual production needs.

1. The raw material (dolomite) is crushed by a crusher to a qualified material (30-40mm).

2. Sintered by rotary kiln and calcined to calcined white.

3. Cooled by a cooler.

4. Then passed through the ball mill to grind into powder.

5. Then pressed into balls by a ball press.

6. Crushed and mixed with ferrosilicon powder (containing 75% silicon) and fluorspar powder (containing GaF2)=95%) to make a homogeneous mass.

7. Loaded into a heat-resistant stainless steel reduction tank, placed in a reduction furnace, at 1200-1250°C and vacuum of 1.33 Pa vacuum degree reduction to produce crude.

8. After melt refining, ingot casting, surface treatment to obtain finished magnesium ingots.

1. Support equipment: spindle layout, set with active temperature measuring equipment and electric heating equipment, together with movable supports for selection.

2. Shift wheel equipment: divided into two types: mechanical wheel and hydraulic thrust shift wheel. Hydraulic retaining wheel equipment is equipped with hydraulic control system.

3. Transmission equipment: with single transmission or double transmission. DC motor or frequency-controlled motor control speed, work reliably.

Rotary kiln calcination of sponge iron fuel used

According to its state, can be divided into: 

1.  solid fuel, such as coal, coke, etc.; 

2.  liquid fuel, such as heavy oil, paraffin, diesel fuel, etc.; 

3. gas fuel, such as liquefied petroleum gas, furnace gas, natural gas, etc.