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coltan refining process in hong kong gold ore crusher

Heraeus Limited is a member of the Heraeus Group, wholly owned by Heraeus Holding GmbH, specializing in the precious metals business. Heraeus has been presented in Hong Kong in 1974, one of the core drivers of Heraeus Group in Asia. Our principal businesses include the refining, trading, manufacturing and marketing of precious metals either as pure metals or as products.

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