High-temperature-resistant metals have good thermal conductivity, electrical conductivity, low thermal expansion coefficient, high-temperature strength, low vapor pressure and wear resistance. They are ideal for electronic power equipment manufacturing, metal material processing, glass manufacturing, high-temperature furnace structural components Important material for aerospace and defense industry applications.
Tungsten and molybdenum are two kinds of high-temperature-resistant metals. Together, tungsten and molybdenum represent an industry, that is, the refractory metal industry. Other refractory metals are niobium, zirconium, titanium, hafnium, rather than an element. It has a great effect on industrial development, and the current products are mainly used on the energized electrodes of argon arc welding machines. China is the world's largest producer of tungsten and molybdenum, and its exports account for 80% of the world's total. It is widely used in welding, electric light sources, electronic devices, chemicals, mining, metallurgy, shipbuilding, petroleum, aerospace and other industrial fields, and has a bright future.
Tungsten-molybdenum and tungsten-molybdenum alloys have become a popular choice for electronic power equipment manufacturing, metal material processing, glass manufacturing, and high-temperature furnace parts due to their good thermal conductivity, electrical conductivity, low thermal expansion coefficient, high-temperature strength, low vapor pressure, and wear resistance. Heavy materials for component manufacturing, aerospace and defense industry applications. The application of molybdenum and molybdenum alloys in the above fields is mainly made by machining, forming, metal processing and welding.
Tungsten is an irreplaceable basic material and strategic resource for the national economy and modern national defense. The cemented carbide made of tungsten has ultra-high hardness and excellent wear resistance, and is used to manufacture various cutting tools, knives, drilling tools and wear-resistant parts. Parts, known as "industrial teeth"; molybdenum is mainly used in the iron and steel industry, most of which are directly used for steelmaking or cast iron after being briquetted with industrial molybdenum oxide, and a small part is smelted into ferromolybdenum and then used for steelmaking .
The data shows that the total proven reserves of tungsten in the world are only 2.9 million tons, which are distributed in China, Canada, Russia and the United States. These four countries account for about 84%; The proportion is about 60%, ranking first in the world. China's tungsten ore resources are very rich and there are many types of deposits, but the industry is chaotic, the product quality is low, and the homogeneity is serious. Although after years of mining order rectification, China's tungsten mining industry still has serious over-exploitation problems. From January to November 2011 In March, China's tungsten concentrate output reached 120,000 tons, a year-on-year increase of 14.06%.
The global molybdenum ore reserves are about 8.6 million tons, and the distribution of global molybdenum resources is highly uneven, mainly in China, the United States and Chile, with reserves of more than 1.1 million tons. In 2010, the total global molybdenum production was 214,000 tons of molybdenum, a year-on-year increase of 12.8%. China's molybdenum production ranks first in the world, accounting for 37.4% of global production in 2010. From January to November 2011, the output of molybdenum concentrate in China reached 216,000 tons, a year-on-year increase of 10.99%.
In 2010, the non-ferrous metal industry conscientiously implemented various guidelines and policies of the Party Central Committee and the State Council, and actively implemented the "Non-ferrous Metal Industry Adjustment and Revitalization Plan". The tungsten and molybdenum smelting industry gradually consolidated its production and sales recovery and achieved steady and rapid growth. . Judging from the operating conditions of the 22 enterprises, in 2010 my country's tungsten and molybdenum smelting enterprises had a good momentum of development and a relatively high level of profitability in the industry. With the rapid development of the downstream industry of tungsten and molybdenum smelting, the demand for tungsten and molybdenum smelting products will continue to increase, and the development prospect of the industry is good.
Tungsten and molybdenum are two elements in the same column of the periodic table. They also exhibit the same nature. Both elements have an average concentration of 1.5 parts per million in the Earth's crust. Molybdenum is an essential nutrient for plants and animals. In high concentrations, molybdenum can cause poisoning which is sometimes the case from leachate from alkaline ash. Tungsten is an important strategic metal that is used in various industrial applications. It is usually mined from scheelite, powder CaWO4, optical channel wolframite (iron, manganese) WO4. Tungsten is released into the environment, for example through its use in winter tires and ammunition. The environmental behavior of tungsten in general is not well known.
