OUTPUT

5000-20000（t/a）

Dolomite,Ferrosilicon,Flurite Powder

Magnesium plant

vertical preheater

OUR ADVANTAGE

1. Energy Saving

The refractory lining of the rotary kiln consists of the outer insulation made of light refractory brick and inner compound refractory bricks, which will reduce the heat emission on the shell surface of the rotary kiln. The pre-heater at the end of the rotary kiln will recycle the heat to preheat the material and save fuel by 40% and increase the output by 30%.

2. Low Consumption

The vertical cooler at the discharge end of rotary kiln recycles the heat of the calcined dolomite which is discharged from the rotary kiln, and will preheat the secondary air up to 600℃. The vertical cooler is integrated with kiln hood to prevent the waste caused by heat emission from the discharged calcined dolomite.

3. Envioronmental Protection

Two phases of dust collection including cyclone filter and bag filter, will control the dust emission below the limitation of the national standard.

4. High Degree of Automation

PLC control system improve the working efficiency.

1

INTRODUCTION
2

SPECIFICATIONS
3

PROCESS

Henan Zhengzhou Mining Machinery Co., Ltd began to manufacture equipments for Mg smelting industry from 1988, and focused on the technology upgrading and utilization. During 2003-2005, the company invented Vertical pre-heater for the calcination of dolomite. This kind of new pre-heater saves fuel by 40% and increases the output by 30%. The exhaust gas is recycled and dust emission can be controlled under 50mg/m3. This kind of new pre-heater takes up more than 85% in the market share. The company has got the patent of energy-saving rotary kiln, vertical pre-heater and vertical cooler.

Pidgeon process is applied in the company’s Mg smelting technology. This kind of process is advanced and reliable technology.

No.	Item name	Parameter for different production capacity
No.	Item name	5000t/a	10000t/a	15000t/a	20000t/a
1	Vibration screen	ZSGB1020	ZSGB1020	ZSGB1230	ZSGB1250
2	Inclined Belt Conveyor	DJ.B500	DJ.B500	DJ.B650	DJ.B800
3	Vertical Preheater	Quadrangle	Hexagon	Octagon	Decagon
4	Rotary kiln	Φ2.5×40m	Φ3.0×50m	Φ3.3×55m	Φ38×58m
5	Vertical cooler	3.6×3.6	3.6×3.6	3.6×3.6	4.1×4.1
6	Cyclone filter	Ø2500	Ø2800	2×Ø2000	2×Ø2800
7	High temp. bag filter	ZL2100	ZL2350	ZL3300	ZL4300
8	High temp. fan	N=315kW	N=355kW	N=500kW	N=800kW
9	Bag filter	ZM32-4	ZM32-5	ZM64-4	ZM64-6
10	Ball mill	MQG1.83×7m	MQG2.2×7m	MQG2.4×7m	MQG3.0×9m
11	Briquetter	3*LYQ5.0	3*LYQ6.0	4*LYQ6.0	4*LYQ8.0
12	Jaw crusher	PEF150×750	PEF150×750	PEF250×750	PEF250×750

Qualified dolomite is transported into the rotary kiln for calcination; Calcined dolomite is mixed with fluorite and ferrosilicon and then pressed into briquette. The briquette is put into retorts where there is vacuum, and then deoxidized into crystallized Magnesium, which is called crude Mg. Crude Mg is smelted and refined to get pure Mg. The complete production line is divided into several systems including raw material storage, dolomite calcination, grinding&briquetting, reduction and refining.