Northeastern University successfully achieved "zero pollution" low-cost production of titanium metal powder

Titanium is a metal material that belongs to both light metals and rare metals. It is widely used in chemical, ship and aerospace industries. Taking an aircraft as an example, titanium materials are used to manufacture aircraft fan blades, discs, shafts, skeletons, skins and other components, and the application amount accounts for more than 15% of the total aircraft weight. Compared with the "advanced" and "high-end" in the field of titanium application, the method of making titanium is based on the methods of the 50s and 60s of the last century, relatively backward, with small output and high waste. A few days ago, the team of Professor Feng Naixiang of Northeastern University successfully researched new process technologies to achieve a reduction rate of 100% of titanium and achieve “zero” emissions. Compared with the current method, the production cost of titanium powder can be reduced by at least 50%.

The traditional preparation method of titanium is the titanium magnesium tetrachloride thermal reduction method, also known as the Kroll method, which is currently the only method for industrial production of titanium metal. The output of this method accounts for only about 55% of titanium, and the entire production process involves the formation of chlorine and chlorine compounds, and the production process emits chlorine-containing waste gas and chlorine-containing waste residue, which has a great impact on the environment and human health. For example, organic chlorides in the environment can deplete ozone, harm the human central nervous system, cause cancer, and cause serious pollution to soil and groundwater. To this end, metallurgists have been working on research and exploration of new titanium metallurgy methods, but there has been no breakthrough progress and results.

Professor Feng Naixiang's team used sodium fluorotitanate as a raw material and aluminum as a reducing agent to prepare titanium metal powder and by-products without titanium cryolite (a flux in the electrolytic aluminum industry, an opacifier for making milky white glass and enamel). According to Professor Feng Naixiang, the new process and technology can not only make the reduction rate of titanium reach 100%, the utilization rate of aluminum can reach 100%, and the whole process does not emit any waste gas, waste residue and waste liquid; Titanium process and equipment structure is simple, there is no technical problem that is difficult to achieve industrialization; the process can not only produce pure titanium powder, but also can produce titanium alloy powder of any component content to meet different titanium alloy components and products, especially It is a requirement for titanium alloy technology for 3D printing of large titanium components on commercial airliners and fighters.

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