Extrusion is a process used to create objects of a fixed cross-sectional profile. The extrusion process is one important step to manufacture tungsten alloy radiation shielding. Tungsten alloy can be pushed or pulled through a die of the desired cross-section. The extrusion process may also increase the strength of tungsten alloy.

The process begins by heating the stock material (for hot or warm extrusion). It is then loaded into the container in the press. A dummy block is placed behind it where the ram then presses on the material to push it out of the die. Afterward the extrusion is stretched in order to straighten it. If better properties are required then it may be heat treated or cold worked. The extrusion ratio is defined as the starting cross-sectional area divided by the cross-sectional area of the final extrusion. One of the main advantages of the extrusion process is that this ratio can be very large while still producing quality parts.

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Tungstate mercury producing processes are as follows:
1.Weigh 0.01 ~ 0.02mol tungsten and mercury salts separately. On one hand, mercury salts and tungsten molar ratio is 1: 1. On the other hand, the mercury salts may be selected from HgCl2 or Hg (NO3) 2 in which tungsten may be selected Na2WO4, K2WO4 or H2WO4 one of them. Then place them in a 45ml autoclave with tetrafluoroethylene-lined, and then adding distilled water to 3/4 volume of autoclave.
2.Adding N2 into reaction solution to get rid of dissolved oxygen in reaction solution. After  sealed the autoclave and put it into oven heating at 140~200℃ for 2~12 hours. And after completion the reaction, closed the oven to reduce the temperature of autoclave by gradient.
3.Using the dropper to take the supernatant of the autoclave and the precipitation put into beaker. After ultrasonic treatment for 5 minutes to 6 hours and then stewing for 1 to 5 hours followed by centrifugation.
4.The resulting precipitate which was got by centrifugation washed with distilled water, acetone and ethanol for three times with separately, finally get mercury tungstate mercury.

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The chemical formular of ferrous tungstate is FeO4W and molecular weight is 303.6826g/mol. Besides the monoisotopic mass and exact mass is 303.865527g/mol, on the other hand, the PubChenm of it is 22178528.
Highly crystalline FeWO4 nanoparticles (NPs) were synthesized via the hydrothermal synthesis method while amorphous FeWO4 NPs were prepared by the room temperature precipitation method. It was found that a dissolution-recrystallization process appeared due to the Ostwald ripening when room temperature precipitates undergo the hydrothermal process. Photocatalytic performance toward the degradation of methylene blue showed that crystalline FeWO4 NPs displayed a higher activity than amorphous samples, mainly ascribing to the substantial elimination of defects after crystallization because the defects promoted the recombination of electron-hole pairs.

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Sodium metatungstate also known as hexasodium tungstate hydrate and it is a white crystal. Its physical properties are shown below: chemical formula: Na6O39W12, the molecular weight: 2968.01, density: 3.1g/ml, refractive index: 1.5555. Related systems numbers of Na6O39W12 are as follows: CAS registry number: 12141-67-2, MDL number: MFCD00061466, EINECS number: 412-770-9, PubChem ID: 24886321. Sodium metatungstate is stable at room temperature and atmospheric pressure, but to avoid contact the material and oxide and it should be sealed and stored at room temperature which somewhere is ventilated and dry.
Sodium metatungstate to water has a certain degree hazard and even a small amount of this product contact with groundwater will pollute the drinking water. So without permission from the relevant government cannot release the material into the surrounding environment. Meanwhile, the products have a certain irritation, if accidentally touching the eyes and skin to use plenty of water clean it and go to hospital to treatment. Therefore, during at the operation, the worker should to take some protective measures, such as wearing protective glasses, protective masks and protective clothing and so on.

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