Coriolis Flowmeter How Coriolis Metering Aids Tungsten Purification

Author / Editor: Birgitte Nielsen Nielsen / Dr. Jörg Kempf

During a field test at H.C. Starck in Goslar, Germany, the new Sitrans FC430 Coriolis flowmeter demonstrated exceptional stability and reliability in measuring the concentration of tungsten metal. Other benefits of particular interest to H.C. Starck included the meter’s multi-parameter measurement capability and its modular design, which facilitates easy operation and servicing.

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The H.C. Starck site in Goslar, Germany, required a flowmeter to provide feed-forward process data to their tungsten purification system.
The H.C. Starck site in Goslar, Germany, required a flowmeter to provide feed-forward process data to their tungsten purification system.
(Picture: Siemens)

The H.C. Starck Group is a leading global supplier of refractory metals and technical ceramics. Headquartered in Munich, Germany, H.C. Starck employs nearly 3,000 people in 12 state-of-the-art manufacturing facilities across Europe, North America and Asia. The company serves a diverse range of industries and is known for high-quality products used in metallurgy and metal processing, optics, electro-technology, electronics, welding, thermal spraying, advanced ceramics, catalysts, and batteries.

The H.C. Starck site in Goslar, Germany, produces powder chemicals and compounds, including tungsten and tungsten alloys. Tungsten (wolfram) boasts the highest melting point of all refractory metals (3,420 °C or 6,188 °F) and a density nearly 20 times that of water. It also offers excellent resistance to corrosion. Tungsten powder is used to form parts via powder metallurgy, while tungsten carbide is important for drill bits, circular saws and other tools.


Real-Time Information Supports Purification Process

To produce tungsten powder and products, H.C. Starck first sources solid tungsten from other industries. This unprocessed metal tends to be extremely brittle and difficult to work with, which is why it must be purified to 99.99% pure tungsten. Purification ensures that the final product will be malleable enough for use in metalworking, while still retaining its distinctive hardness.

The raw metal is first converted to sodium tungstate in dissolving tanks. The solution then passes through filter presses before being sent to an intermediate storage tank where it awaits transfer to a purification header vessel. When one of the header vessels needs to be refilled, a downstream level controller starts a pump and the required quantity of sodium tungstate solution is transferred from the storage tank to the vessel.

Ensuring the Effectivity of Purification Processes

To ensure that the purification process is as effective and time-efficient as possible, the purification system must receive real-time updates on the exact concentration of tungsten in the solution being transferred to the header vessel...