Tungsten alloy sheet is applied for a CT detector (X-ray detector) to shield X-ray radiation. Tungsten alloy sheet is made of W-Ni-Fe alloy - an alloy composed of a small amount of nickel, iron and other alloying elements using tungsten as the matrix, and has a high density (~18.8g/cm3) and a high energy ray absorption capacity (1/3 higher radiation absorption coefficient than lead), so that it is widely used in the radiation protection and guidance of CT detectors to provide radiation protection for medical workers, patients and their family members.

How to prepare ammonium paratungstate? At present, ion exchange method and extraction method are mainly used to produce ammonium paratungstate (APT) by domestic manufacturers.

The researchers proposed a preparation method of ammonium paratungstate, in which the obtained APT is high-purity APT. That is because: with the continuous development of the tungsten industry, the ammonium paratungstate products produced by the existing ion exchange method and extraction method are increasingly unable to meet the requirements of producing high-quality tungsten deep processing products.

The researchers proposed a preparation method of high-purity ammonium paratungstate. This process optimizes the original high-purity APT production process and reduces production costs.