Nickel-tungsten catalysts are widely used in hydrofining and hydrocracking. Their main components are about 25% tungsten trioxide, 2% nickel oxide, 50% alumina, 5% silicon dioxide and a small amount of iron and vanadium. Waste nickel-tungsten catalysts contain tungsten, nickel and other metals. If they can be recycled, they will produce enormous economic benefits. At the same time, the pollution and damage to the environment caused by waste nickel-tungsten catalysts are avoided.

At present, tungsten-rare earth oxide electrode materials for argon arc welding, plasma cutting and steelmaking at home and abroad are manufactured by powder compaction, sintering and deformation.

Nitrogen oxides (NO_x) emitted from coal-fired power plants are recognized as one of the three major atmospheric pollutants, which can cause environmental problems such as acid rain, ozone layer destruction, greenhouse effect, and seriously endanger the earth's ecological environment and human health.

Carbon fiber is a new type of fiber material with more than 95% carbon content. Its quality is lighter than that of metal aluminium, but its strength is higher than that of steel, and it has the characteristics of corrosion resistance and high modulus. It is an important material in national defense, military and civil fields. At the same time, the good conductivity and thermal conductivity of carbon fibers make them have a broad application prospect in the field of energy storage and conversion in the new generation.