The main use of magnesium is the production of aluminum alloy, magnesium is an important component of aluminum alloy, it can improve the mechanical strength of aluminum alloy, improve mechanical processing performance. Because magnesium alloy with other metals (aluminum, zinc, manganese, etc.) has high strength per unit weight and high chemical stability, it has been widely used in automotive aviation and other industries. Magnesium base alloy structural parts or die casting parts can replace part of the aluminum, reducing the operation of energy consumption.
Main uses of magnesium metal
Applications are mainly concentrated in magnesium alloy production, steel desulfurization, but also used in rare earth alloys, metal reduction, corrosion protection and other fields. Many steel mills use magnesium desulfurization, the desulfurization effect of the use of magnesium pellets is better than calcium carbide.
With the continuous progress of society and the continuous improvement of science and technology, the production process of magnesium metal is becoming more and more mature. As far as the current situation is concerned, the magnesium metal production process can be roughly divided into two main methods, one is the thermal reduction method, the other is the electrolysis method, these two methods can be subdivided into several different methods. Each method has its own advantages and special uses.
1, magnesium metal production process thermal reduction method introduction: The application of thermal reduction method, mainly the use of chemical silicon to achieve the purification of magnesium metal. The raw materials used in the production process are silicon carbide, calcium oxide and pure silicon, and the conditions required for the chemical reaction produced by it are high temperature and vacuum, and the temperature at high temperature should reach 1100~1250 degrees Celsius. As we know, when the thermal reduction method is used to manufacture magnesium metal, it is divided into several different methods according to the different reaction equipment required, but their principle is the same. According to the different equipment, it is divided into four different methods, namely Pijiangfa, Balzano method, Magni method, MTMP method, and now we will discuss these four methods first.
2, metal magnesium production process Pijiang method introduction: Pijiang method is a more typical method of producing metal magnesium, the raw materials required in the method are dolomite ore, fluorite, silicon ore, coke and scrap iron. In the production process, the dolomite ore is calcined in the rotary kiln to produce white jade, and then it is crushed, and then the fluorite is crushed, the mixture of the two is put into the mixing ball, and the silicon ore, coke, waste iron is put into the electric arc furnace for reaction and then crushed to produce ferro silicon powder, which is put into the ball making machine with the mixture in the mixer. Then put into the reduction furnace and add pellets containing ferro silicon and fluorite, which will form magnesium crystals after reduction reaction, and then melt and purify to form magnesium metal. The production time cycle of this method is about 10 hours. Its process is almost divided into three stages, including preheating period, low vacuum heating period and high vacuum heating period.
3, metal magnesium production process Balzano method introduction: Balzano method is developed on the basis of the Pijiang method, its basic process is very similar to the Pijiang method, but some places are different. The main difference is that it does not press dolomite and ferrosilicon into clumps during the reaction process but directly uses an electric heater to heat it, in this case a relatively energy-saving method, which is now used by a company in Brazil.
4, magnesium metal production process Magni method introduction: Magni method was found around 1960, in our view its remarkable characteristics is the use of a more energy-saving method, but its reaction cycle is relatively long, than the Chipijiang method is ten hours to sleep, its reaction time is almost twice his, generally 16 to 24 hours. In the reaction container, the form of the material in the container is generally liquid, and the reaction temperature is also high, generally exceeding the line of the Pijiang method, with 1300 to 1700 degrees Celsius. In the production process, magnesium metal is produced in gaseous or liquid form and in the condenser.
5, metal magnesium production process MTMP method introduction: MTMP method is a more continuous production technology for the manufacture of metal magnesium. In the manufacturing process, his reaction temperature requirements are higher, to 1700~1750 degrees Celsius, and the final generation of metal magnesium is also generated in the condenser. The above four are some of the effects that can be achieved by the thermal reduction method of magnesium metal in different production equipment and production conditions.
6, the electrolysis method as we now advocate the requirements of energy saving, electrolysis may be more popular with us, because the production process of electrolysis is relatively advanced and simple, and has the characteristics of low energy consumption. The core of electrolysis method is to use direct current to electrolysis molten anhydrous magnesium chloride, so that it is decomposed into magnesium and chlorine gas. In terms of electrolysis, it can be divided into different methods according to the raw materials not used. Generally can be divided into Tao Wu method, magnesium oxide chloride method, AMC method and so on. Let’s discuss some of these in detail.
7, metal magnesium production process Tao Ufa introduction: Tao Ufa is a relatively simple electrolysis method, his raw materials are also easy to get. Its raw materials include seawater and lime milk, the use of these two raw materials to extract magnesium hydroxide, and then chemical reaction with hydrochloric acid to produce a solution, in electrolysis, this method is a relatively simple production method, energy saving and cost saving.
8, metal magnesium production process chlorination method: The raw material for the production of magnesium oxide chlorination process is carnhalite. After the fluidized bed, it is added to coke and chlorine gas and then put into the chlorination furnace. After the reaction, chlorine gas, metal magnesium and potassium chloride are generated by electrolysis. There are several other methods of electrolysis besides these two. One of the most characteristic is the snooker method, temperament sister is the use of magnesium chloride, under high pressure, electrolytic extraction of metal magnesium. In particular, it is unique in that it does not use chlorination to make raw materials for the production of magnesium.
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