As a non-ferrous metal magnesium, it has a low density, high strength, good damping, thermal conductivity, machinability, and electromagnetic shielding can be recycled than with environmental friendliness, excellent performance, it is called century "green" engineering materials, becoming steel, aluminum metal's third largest engineering materials. Therefore, magnesium and magnesium alloys have important application value and broad application prospects in aerospace, transportation, 3C products, metallurgical industry, electrochemical industry, etc., especially the lightweight structure and environmental protection requirements, which has further stimulated the magnesium metallurgical industry. development of.

In 2008, the world's annual output of magnesium is about 700,000 tons. China's output accounts for 80% of the world's total output. It is the world's largest magnesium producer and also accounts for 60% of global magnesium exports. At present, magnesium metallurgy has an annual output of about 500 million tons compared with the steel industry. Even the annual output of aluminum is 10 million tons. The magnesium metallurgy industry with an annual output of 700,000 tons is still a small-scale development industry.

At present, the main methods of magnesium smelting in the magnesium metallurgy industry are electrolysis and Pijiang silicon thermal method. Electrolysis is widely used in foreign countries, but the cost of electrolysis of magnesium is very high. The Pijiang Silicon Thermal Method is a labor-intensive production method because of its simple technology of magnesium smelting and low investment cost. However, China's labor force is abundant and its price is low, and environmental protection standards are relatively loose. Therefore, China's magnesium metallurgy is dominated by Pijiang Silicon Thermal Method. Although China is the largest magnesium producer in the world, China's magnesium metallurgy technology is still quite backward, with high energy consumption and serious environmental pollution. At present, silicon thermal smelting of magnesium requires about 10 tons of high-quality coal , 10t of dolomite, more than 1t of ferrosilicon and other auxiliary materials such as fluorite for every 1t of raw magnesium. The overall energy utilization rate is about 5% to 8%. Energy saving and emission reduction potential. After entering the new century, cost pressure and environmental pressure forced the magnesium metallurgical industry to continuously improve the scientific and technological content, promote technological progress, reduce costs, and reduce pollution. To this end, the state has continuously formulated the “10th Five-Year” scientific and technological research plan for the magnesium metallurgical industry and “Eleventh Five-Year Plan”. "Technology support plan, actively promote the progress of magnesium metallurgy technology and technology development.

In response to the process principle of Pijiang method for smelting magnesium, Beijing Walker Company has developed a set of high-efficiency energy-saving and deep-environmental magnesium metallurgy technology, which greatly reduces the energy consumption of magnesium smelting, improves the environmental friendliness of the process, introduces the recycling industry, and recycles the magnesium metallurgical industry. Various products.

Magnesium metallurgy technology is mainly composed of dolomite calcination, vacuum reduction and coarse magnesium refining. Among them, the calcination mainly decomposes dolomite (CaCO ₃ , MgCO ₃ ) directly into calcined white (CaO·MgO) at 1150 ° C to 1250 ° C, and releases CO _{2 in} the carbonate.

The Dolomite U-type direct regenerative calcining kiln developed by Beijing Walker Energy Co., Ltd. adopts a U-shaped kiln body in the form of cocurrent combustion countercurrent heat storage, which is periodically commutated for combustion and heat storage. The fuel is passed through a plurality of combustion lances that extend vertically into the bottom of the preheating zone and is evenly distributed across the cross section of the kiln to ensure uniform calcination. The lower part of the kiln cooling section is ventilated to cool the calcined white, and the combustion flue gas is mixed with the preheated cooling air through the flue gas connecting passage from the combustion kiln into the non-combustion kiln for preheating the ore. The U-type kiln adopts the fast-burning and quick-cooling heating process, and the calcination is uniform, ensuring that the calcination white activity can reach 32% to 35%, and at the same time, the calcination reduction is reduced to 0.2%, and the calcination reduction is 0.5% lower than the reduction process. The requirement is that the calcined white quality is higher than the calcined white quality of other calcining equipment. The calcination activity is increased, and the reduction is reduced by 60%, which greatly improves the quality of the reduced crude magnesium and increases the yield of crude magnesium. The U-type direct regenerative calcining kiln is a counter-current regenerative heat, which fully utilizes the high-temperature residual heat after flue gas and cooling air preheating, thus reducing the calcination energy consumption, reaching 142kg coal/ton of calcined white, and the new type of revolver with preheater Compared with 230kg standard coal/ton of kiln calcination, the energy consumption is reduced by more than 40%, and the sub-thermal efficiency is over 85%. At the same time, the kiln has simple equipment, high operational reliability, small unit area, low overall investment, large unit investment capacity and good economic performance.

The dolomite is calcined, the ball is made into a ball, and sent to a reduction furnace, and the crude magnesium is obtained by vacuum reduction at a temperature of 1200 ° C to 1250 ° C. Due to the backward production mode of the existing reduction furnace, the exhaust gas temperature is high and the fuel consumption is large. It takes 6.5-7 tons of standard coal to produce one ton of crude magnesium. The unreasonable combustion mode and furnace design result in uneven temperature inside the furnace. The pressure is unstable, the local temperature of the reduction tank is high, and the service life is short. At the same time, the production of one ton of crude magnesium emits 18 tons of CO ₂ and the environmental pollution is serious. The regenerative metal magnesium reduction furnace adopts advanced high-temperature air regenerative combustion technology and periodically commutates combustion to ensure uniform temperature and stable pressure in the furnace and improve the furnace atmosphere. At the same time, the three-dimensional support in the furnace is designed to ensure the strength of the furnace. The reduction furnace was put into use in Shanxi and Henan, and the capacity of single tank was increased by 10%. At the same time, the energy consumption was reduced to 2.3 tons of standard coal/ton of magnesium, which was reduced by more than 60%, CO ₂ emissions were reduced by more than 50%, and magnesium emissions were reduced. 8 tons of CO _{2 has} reached the domestic advanced level.

The crude magnesium in the reduction furnace is refined in a refining furnace to obtain the finished magnesium, that is, refined magnesium. At present, the main problem of the refining furnace is that the exhaust gas temperature is high, and the waste heat of the flue gas is not fully utilized, and the energy consumption is large. The exhaust temperature of the refining furnace is about 900 °C. The existing refining furnaces directly discharge the flue gas. Beijing Walker Energy Co., Ltd. cooperates with the Thermal Energy Department of Beijing University of Science and Technology to jointly develop continuous high-temperature air combustion technology to recover flue gas waste heat and preheat. The air temperature is 700 ° C, the flue gas discharge temperature is reduced to below 200 ° C, and the flue gas waste heat is fully utilized. The energy consumption of the refining furnace is reduced by 70kg of standard coal per ton of magnesium, which is reduced by more than 60%.

The use of this technology to produce 10,000 tons of refined magnesium, is expected to save 50,000 tons of fuel, reduce CO ₂ emissions by 140,000 tons, and reduce SO ₂ emissions by 0.1 million tons.

For a significant part of our products surface treatment is the last stage of manufacturing that is carried out through suppliers. Our surface treatment suppliers undergo a strict selection process and we set very high quality requirements for these supplier in order to ensure that the quality of surface finish of the fabricated parts meet customer requirements.