Product Overview

Magnesium is one of the most abundant reserves light metal element on the earth, its specific gravity is 1.74g/cm3, which is 2/3 of aluminum, 2/5 of titanium, 1/4 of steel; the weight of magnesium alloy is 36% lighter than aluminum alloy,73% lighter than zinc alloy, 77% lighter than steel. The melting point of magnesium is 648.8℃. Its specific strength and specific stiffness is high, nice heat and electrical conductivity. It also has excellent property of shielding, damping, shock absorption, machinability. And low fabricating cost, fabricating energy consumption is 70% of aluminum alloy, and easy recycling.

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The feature of Magnesium and Magnesium alloy

（1）The feature of Magnesium
its specific gravity is 1.74g/cm3, which is 2/3 of aluminum, 2/5 of titanium, 1/4 of steel; the weight of magnesium alloy is 36% lighter than aluminum alloy,73% lighter than zinc alloy, 77% lighter than steel. The melting point of magnesium is 648.8℃. Its specific strength and specific stiffness is high, nice heat and electrical conductivity. It also has excellent property of shielding, damping, shock absorption, machinability. And low fabricating cost, fabricating energy consumption is 70% of aluminum alloy, and easy recycling.

（2）The feature of Magnesium alloy
① Light-weight, 77% lighter than steel, 35% lighter than aluminum alloy, it is the lightest structure metal material in common usage
② Its specific strength and specific stiffness is high. On the equivalent condition, the strong degree for 1kg magnesium alloy is equal to 2.1 kg steel, and 1.8kg aluminum, if use magnesium alloy substitute engineering plastic, the thickness can be decrease 64%, weight can decrease 36%.
③ Nice impact resistance and damping. The property of shake resistance and noise reducing is 10~50 times of aluminum alloy, at the same impact, its impacting thickness is 1/3 of engineering plastic.
④ Good heat dissipation, the coefficient of heat conduction is 150 times of engineering plastic, which is suitable for high heat dissipation electronic products.
⑤ Preventing electromagnetic interference, nice shielding property.
⑥ Excellent casting formability, it can press casting component with complicated shape and ultrathin cover. The thinness can reach 0.45mm, but the engineering plastic only can reach 1.2~2mm.
⑦ Good electrochemical action, mainly used for sacrificial anode.
⑧ It can complete get reusing. Is environmental product.

The application field of Magnesium and Magnesium alloy

1.Application of Magnesium
（1）Producing reducing agent of refractory metal. Magnesium can used to produce reducing agent like Titanium, Zirconium, Hafnium, Beryllium, Boron etc. Also the annual usage of agent to producing metallic Titanium have increased year by year.
（2）The adding element for Aluminum Alloy.
（3）The nodulizing agent for nodular cast iron.
（4）Desulfurizing agent for steel desulfuration.
（5）High storage capacity material. Magnesium will transfer to magnesium hydride under the condition of normal pressure, 523℃ mixing with hydrogen. And under the condition of low pressure and higher temperature will produce hydrogen again, so magnesium is the perfect material for hydrogen storage.
（6）Fireworks. Magnesium have been widely used for producing fireworks, signal shell, star shell, incendiary shell.

2. Application of Magnesium Alloy

The Magnesium Alloy have mainly applicable for Aerospace industry, Automobile industry, Motorcycle and Bicycle industry, Shipping industry, National Defence industry, 3C(Computer, Consumer Electronic product, Communication), Medical Industry, sacrificial anode industry, Antiseptic industry and other fields.

The advantages of Magnesium Alloy automobile parts can be concluded to: Small density to reduce weight of whole vehicle, reducing fuel consumption indirectly; The specific strength of Magnesium Alloy is higher than Aluminum Alloy and Steel, specific stiffness is close to Aluminum Alloy and Steel, that will be bear a certain load; Magnesium Alloy have perfect castability and dimensional stability, which will be easy to processing with low rejection rate; Magnesium Alloy have perfect damping factor, vibration reducing is higher than Aluminum Alloy and Casting Steel, can be reducing noise when used for shell and reducing vibration when used for seat and rim, which will enhance the safety and comfort of the vehicle. Magnesium Alloy Pressured Casting Parts have showing long-term growth on the field of vehicle application. In the past ten years, it’s growing speed have exceed 15%.

The magnesium alloy can satisfy with the requirement of lightweight material noise absorption, damping and radiation protection in aerospace and other high-tech area, which can great improve gas dynamics performance of the aircraft and reduce the structure weight. From 1940s, the magnesium alloy was first widely used in aerospace department. The B-36 heavy bombers used 4086kg magnesium alloy plate for each one from abroad. The wing of Lockheed F-80 jet fighter used magnesium plate, and then the structure parts quantity reduced from 47758 to 16050. The Chinese fighter plane, bomber, helicopter, transport plane, civil aircraft, aircraft radar, surface-to-air missile, carrier rocket, artificial satellite, airship were all used magnesium alloy component. Each model of the plane was able to choose the magnesium alloy components with the maximum quantity of 300 to 400. The weight of one part is nearly 300 kg. The maximum size of one component is more than two meters.

In order to increase the structure hardness, reduce equipment weight and increase the weapon accuracy which should use the magnesium alloy plate in military industry.

In recently 20 years, the global automotive output has sustainable growth, the AAGR is 2.5%. The development of automotive industry is an important one kind of development mark for a country, but the metal material is the important foundation for the development of automotive industry. Because of the requirement of Energy Conservation and Environmental Protection, the automotive designer tries to reduce its weight to reach the reduction of petrol consumption and exhaust gas emission. As the lightest structure material, the magnesium alloy can satisfied the increasingly stringent requirement for the energy saving exhaust gas emission, which can produce new model automotive with less weight, low petrol consumption and environment protection. The advantage of magnesium alloy automotive parts was concluded as follows:

The lower density was able to reduce the entire weight, then reduce the fuel oil consumption indirectly.

The hardness of magnesium is higher than aluminum alloy and steel, which rigidity was similar with aluminum alloy and steel to bear a certain load.

The magnesium has well castability and dimension stability, which processing was easy and low waste.

The magnesium has well damping factor and the vibration quantity was larger than aluminum alloy and steel, the noise can be reduced when it used for case, and the vibration can be reduced when it used seat and wheels, then the safety and comfort can be increased.

At present, the magnesium alloy die casting products were widely used in Instrument, car seat frame, direction control system components, engine hood, gearbox, intake manifold, wheel hub, engine and security components.

Production Process

The magnesium production process use rotary kiln for dolomite calcination, its advantage is big processing capacity, high mechanization degree, easy operation and maintenance, calcined dolomite with high reactivity, low LOI, the extraction rate of magnesium and usage rate of silicon is high.

The material inside rotary kiln get fully roll over along with kiln rotation, which strengthen radiation heat transfer, material get evenly heating and complete calcination, the calcination temperature is easy to control, thus rotary kiln is the ideal equipment for dolomite calcination.

Since from 1988, ZK began to produce equipment for magnesium industry, with the technical support from Henna Metallurgical Planning & Design Institute and CHALCO Zhengzhou Research Institute. Based on this experience accumulation of equipment manufacturing and technical improvements. During 2003~2005, we successfully developed a new pre-heater for dolomite calcination. This equipment can save fuel 40%, output capacity increase 30%. And it reuse the waste gas for pre-heating dolomite, at the other hand, it good for dust control system help realize the emission below 50mg/m3. We take more 80% market share in domestic, it becomes the top option for magnesium industry.

1、 Conveying and screening
The dolomite with size 10~40mm transport to plant and in storage yard, the storage volume is for one month consumption. Dolomite will be sent by a loading machine to hopper underground. And vibrating feeder will evenly feed to belt conveyor and convey to screening building.

2、Preheating
After screening, the qualified dolomite will be sent to hopper of preheater top part by inclined belt conveyor. It will slide to preheater body by chute. The hot gas with temperature 1100℃ from rotary kiln inlet will go through material layer and have heating exchange with dolomite, dolomite will be pre-heated to more than 800℃, part of them get decompose.

3、Calcination in rotary kiln
The dolomite after preheater will be pushed into rotary kiln by hydraulic push rods, it will be calcined to active dolomite in the temperature 1250℃, then discharge to vertical cooler, where it has heat exchange with cooling air that blowing in by fan. It cool down calcined dolomite below100℃, air is heating to 600℃. The heat air will go to rotary kiln for combustion as secondary air.

4、Dust collecting
The hot gas from rotary kiln, after heat exchange with dolomite in preheater, temperature decrease below 220℃, it can go to bag filter directly, after dedusing, the clean air will exhaust to air. Dust collecting system have twice dust collecting process, high efficiency, emission concentration ≤30mg/Nm3, higher than national standard.

5、Cooling by vertical cooler
The vertical cooler will cool calcined dolomite to 200℃.

6、Crushing and storage
After cooling, the calcined dolomite will be sent to #1 hopper by chain conveyor and bucket elevator, ferrosilicon will be crushed to below 10mm and elevated to #2 ferrosilicon hopper, then it will be ground below 5mm to #3 ferrosilicon hopper.

7、Briquetting
The fluorite powder will be sent to #4 hopper by scraper conveyor. The three raw materials in the hopper will be weighed and fed in to ball mill for grinding, the size is < 100 mesh, the mixing powder will be briquetted to lump for next process.

8、Reduction
The lump will be heated at 1200+10℃ in retorts, under 13.3Pa or higher vacuum condition, keep 8-10 hours, the MgO reduction to Mg steam, it become crude magnesium after condensation.

9、Refine and casting
The crude magnesium will heat for melting, add flux for refine at temperature 710℃, then cast to ingot.
Henan Zhengzhou Mining Machinery Co., Ltd adopt advantage technology and reliable DCS central control system for magnesium production line, the operation management is in master control room.

Product Specification

The weight of single piece magnesium ingot is 7.5±0.5kg。

Product Index

1.Product classification
Mg9999、Mg9998、Mg9995A、Mg9995B、Mg9990、Mg9980。
It has six grade according to chemical component : Mg9999、Mg9998、Mg9995A、Mg9995B、Mg9990、Mg9980。

2. Chemical component
See table 6.1

Table 6.1 Chemical component of magnesium ingot

牌号 Grade	化学成分（质量分数）‘／% 　 Chemical component (mass fraction)
	M不小于 M not less than	杂质元素，不大于 impurity, not more than
	M不小于 M not less than	Fe	Si	Ni	Cu	A1	Mn	Ti	Pb	Sn	Zn	其他单个杂质 other impurity
Mg9999	99. 99	0.002	0.002	0.0003	0.0003	0.002	0.002	0.000 5	0. 001	0.002	0.003
Mg9998	99. 98	0. 002	0. 003	0.000 5	0.000 5	0. 004	0. 002	0.001	0. 001	0.004	0. 004
Mg9995A	99. 95	0. 003	0. 006	0. 001	0. 002	0. 008	0. 006		0. 005	0. 005	0. 005	0. 005
Mg9995B	99. 95	0. 005	0. 015	0. 001	0. 002	0. 015	0. 015		0. 005	0.005	0. 0l	0. 0l
Mg9990	99. 90	0. 04	0. 03	0. 001	0. 004	0. 02	0. 03					0. 0l
Mg9980	99. 80	0. 05	0. 05	0. 002	0. 02	0. 05	0. 05					0. 05
Cd、Hg、As、Cr6+元素，供方可不作常规分析，但应监控其含量，要求w(Cd+Hg+As+Cr6+) ≤0.03%。 Element Cd, Hg, As, Cr6+ The supplier does not have regular analysis, but the content should be control, it requires w(Cd+Hg+As+Cr6+) ≤0.03%。

Product certificate

The production process apply ISO9001 quality management system.

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E-mail

ec09@zkcorp.com

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