Zirconium and hafnium, in the eyes of ordinary people is two kinds of special metal materials, does not have special significance. But in fact, zircon has a unique nuclear properties, in which the sub-absorption section is small, in high temperature, high pressure and water has excellent corrosion resistance, in the nuclear reactor and has good anti-radiation performance, Zirconium which is often used as nuclear reactor fuel Cladding material and core structure material.
The hafnium has a plasticity, easy processing, high temperature, corrosion resistance characteristics, hafnium thermal neutron capture cross section, is the ideal neutron absorber, can be used as atomic reactor control rods and protection devices.
Zirconium, hafnium high temperature resistance, corrosion resistance and has a unique nuclear performance, so that they not only in nuclear industry, nuclear power and other industries can be used for reactor shell and structural materials, reactor control materials, but also in the machinery manufacturing, chemical oil, Metallurgy, pharmaceutical, electronics and other fields are widely used. Nuclear grade zirconium and hafnium materials for nuclear industry applications are rare metal materials.
Now China's nuclear power with zirconium tube and zirconium alloy materials due to the separation of technology constraints, product development and application compared with foreign countries there is a big gap, resulting in this type of material is still dependent on imports.
Zirconium and hafnium materials for other manufacturing industries such as the automotive industry, aerospace vehicle manufacturing, and hafnium-free nano-zirconia in the special tool industry, ceramic industry, fiber optic connectors, special machinery parts and other manufacturing applications are widely used, Where the high-end "broad market prospects.
Zirconium hafnium separation technology, in today's world of new materials science and technology competition plays an increasingly important role, but frozen three feet non-day cold. In the scientific and technological competition so intense today, in order to achieve the corner overtaking, Zirconium the need is not only the courage and courage, it is comprehensive strength.
In natural minerals, zirconium and hafnium accompanied by Health. The hafnium content in the zirconium is generally 1% -2%, the general industrial zirconium, without the separation of hafnium from zirconium, and as the nuclear industry used nuclear grade zirconium, must be zirconium, hafnium separation, the output nuclear grade zirconium and nuclear Grade hafnium. Zhu Xingfeng said that the current nuclear grade zirconium, hafnium separation and preparation method is roughly the fire separation method and wet separation method.
Zirconia (ZrO₂) is a natural mineral raw material, mainly inclined zircon and zircon. Zirconite igneous rock deep mineral, the color is yellow, brown, yellow and green, etc., the proportion of 4.6-4.7, hardness of 7.5, with a strong metallic luster, ceramic glaze for raw materials. Pure zirconia is a high grade refractory material with a melting temperature of about 2900 ° C. It can improve the high temperature viscosity of the glaze and increase the viscosity of the temperature range, with good thermal stability, its content is 2% -3% , Can improve the anti-cracking performance of glaze. But also because of its chemical inertia, it can improve the chemical stability of glaze and acid and alkali resistance, but also play the role of opacifying agent. In the construction of ceramic glaze in the use of zircon, the general amount of 8% -12%. And for the "underglaze white" the main raw material, zirconia for the yellow-green pigment good auxiliary agent, if you want to get a better vanadium zircon yellow pigment must be selected pure pure zirconia.
Zirconium and lithium and titanium can be a strong absorption of nitrogen, hydrogen, oxygen and other gases. When the temperature exceeds 900 degrees Celsius, zirconium can violently absorb nitrogen; under the conditions of two hundred degrees Celsius, one hundred grams of metal zirconium can absorb 817 liters of hydrogen, equivalent to iron more than 800,000 times. This characteristic of zirconium has been widely used. For example, in the electric vacuum industry, zirconium powder is widely used on the surface of the anode and other heat receiving parts of the electric vacuum element and the instrument to absorb the residual gas in the vacuum tube, Of the tubes and other electrical vacuum meters, thereby improving their quality and extending their use of time.