GURO Vitaliy Institute of general & inorganic chemistry AS

Ammonium Perrhenate Purificiation and Rhenium Recovery from Heat-Resistant Rhenium-Nickel Superalloys

An enterprise for purification of crude ammonium perrhenate purchased at Central Asia region as well as for rhenium recovery from Re-Ni heat resistant superalloys wastes of СМSХ–4 & СМSХ–10 types, has started its activity at Czech Republic. First type of rhenium raw material - the initial ammonium perrhenate (APR), for example, according to Uzbekistan’s Standard TU 48-7-1-90, type AR-0, contains: Re not less than 69 % mass.; impurities, ppm: P 90, S 200, Fe 50, Si 20, Mn 2; Mg 8, Ni 2, Al 5, Mo 5, Ca 10, Cu 3, K 40-70; Na 40. By means of ion exchange on Purolite resins surface and electrodialysis approach the content of above mentioned impurities in NH4ReO4 salt might be significantly reduced (K< 20). Second type of rhenium raw material – metallic wastes of superalloys of СМSХ–4 & СМSХ–10 type contains, % mass: Re 3-6; Cr 6.5; Co 9; Mo 0.6; W 6; Ta 6.5; Re 3; Al 5.6; Ti 1; Hf 0.1; Ni 61.7. The resulting APR is of high quality too. Powdery metal rhenium might be produced from this APR at the enterprise as well by means of its high-temperature reduction by gaseous hydrogen… The purity of metallic rhenium produced by this method is generally determined by purity of APR applied.

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