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China: Energy Efficiency

SGL Installs Hydrogen Chloride Recycling System for China's Largest Potassium Producer

| Editor: Alexander Stark

Installation of a shell and tube heat exchanger.
Installation of a shell and tube heat exchanger. (Source: SGL Group)

A recovery system for recycling and reusing hydrogen chloride (HCI) developed by SGL Group will be part of a new electrolytic smelting system of the Chinese potassium producer Qinghai Salt Lake Industry.

Wiesbaden/Germany — Commissioned in the Chinese Province of Qinghai this year, the system produces magnesium with the lowest CO2 values worldwide, the manufacturer claims. The complex will also comprise a patented solution from SGL Group, which is supposed to consumes up to 45 % less energy compared with standard processes.

“We decided to develop our new system based on a demand for greater energy savings,” states Oliver Seidel, Head of Process Technology, a division of SGL Group’s Business Unit Graphite Materials & Systems. “Now that the QSL melting system has been commissioned, we are extremely pleased to be able to demonstrate that our process works on an industrial scale.”

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QSL is the largest potassium producer in China, producing both salts and magnesium, which are chemically bonded to salt from the Qinghai salt lake. Hydrogen chloride (HCI) is used to separate the magnesium from the salt and then prepare it for further processing. The system part supplied by treats the contaminated HCI and returns it to the main process. The overall system consists of columns, heat exchangers, pumps and tanks made Diabon graphite and Polyfluron PTFE.

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