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A hydrogen extraction unit has reformed gas flow channel plates, hydrogen separation plates, and purge gas flow channel plates, which are designed as thin metal plate members. The hydrogen extraction unit is constructed by laminating these thin plate members and then bonding them together by diffusi

A hydrogen extraction unit has reformed gas flow channel plates, hydrogen separation plates, and purge gas flow channel plates, which are designed as thin metal plate members. The hydrogen extraction unit is constructed by laminating these thin plate members and then bonding them together by diffusion bonding. Each of reformed gas flow channel holes formed in the reformed gas flow channel plates constitutes a flow channel for reformed gas together with a correspondingly adjacent one of the hydrogen separation plates. Each of purge gas flow channel holes formed in the purge gas flow channel plates constitutes, together with a correspondingly adjacent one of the hydrogen separation plates, a flow channel for purge gas with which hydrogen extracted from reformed gas is mixed.

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A hydrogen extraction unit has reformed gas flow channel plates, hydrogen separation plates, and purge gas flow channel plates, which are designed as thin metal plate members. The hydrogen extraction unit is constructed by laminating these thin plate members and then bonding them together by diffusi

A hydrogen extraction unit has reformed gas flow channel plates, hydrogen separation plates, and purge gas flow channel plates, which are designed as thin metal plate members. The hydrogen extraction unit is constructed by laminating these thin plate members and then bonding them together by diffusion bonding. Each of reformed gas flow channel holes formed in the reformed gas flow channel plates constitutes a flow channel for reformed gas together with a correspondingly adjacent one of the hydrogen separation plates. Each of purge gas flow channel holes formed in the purge gas flow channel plates constitutes, together with a correspondingly adjacent one of the hydrogen separation plates, a flow channel for purge gas with which hydrogen extracted from reformed gas is mixed. f a Symposium on Precious and Rare Metals held in Albuquerque, NM; Apr. 6-8, 1988; pp. 290-305. Atluri et al.; "Recovery of Gold and Silver from Ammoniacal Thiosulfate Solutions Containing Copper by Resin ion Exchange Method"; A Thesis Submitted to the Faculty of the Department of Materials Science and Engineering at the University of Arizona, 1987, 219 pages. Awadalla et al.; "Recovery of Gold from Thiourea, Thiocyanate, or Thiosulfate Solutions by Reduction-Precipitation with a Stabilized Form of Sodium Borohydride"; published in Separation Science and Technology, 26(9), 1991, pp. 1207-1228. Bagdasaryan; "A Study of Gold and Silver . . . " Izvestiia Vysshikh Uchebnykh Zavedenii Tsvetnaia Metallurgiia, vol. 5, 1983; pp. 64-68. Bartels; "Chemical Abstract Index Compilation for Thiosalts and Related Compounds"; Report dated Nov. 1978, A1-A17; pp. 1-5. Benedetti, Marc and Boulegue; "Mechanism of Gold Transfer and Deposition in a Supergene Environment"; Geochimica Et Cosmochimica Acta; vol. 55, 1991, pp. 1539-1547. Berezowsky et al.; "Recovery of Gold and Silver from Oxidation Leach Residues by Ammoniacal Thiosulphate Leaching"; Paper presented at the 108thAIME Annual Meeting, New Orleans, Louisiana, Feb. 18-22, 1979; pp. 1-18. Block-Bolten et al.; "New Possibilities in the Extraction of Gold and Silver from Zinc and Lead Sulfide Flotation Wastes"; TMS-AIME Fall Extractive Meeting; 1985, held in San Diego, CA; pp. 149-166. Block-Bolten et al.; "Gold and Silver Extraction from Complex Sulfide Wastes"; Recycle and Secondary Recovery of Metals: Proceedings of the Int'l. Symposium on Recycle and Secondary Recovery of Metals and the Fall Extractive and Process Metallurgy Meeting: 1985; pp. 715-726. Block-Bolten et al.; "Thiosulfate Leaching of Gold from Sulfide Wastes"; Metall. 40, Hahrgang, Heft 7, Juli 1986; pp. 687-689. Bourge; "Thiosulfate may replace cyanide in leaching"; American Metal Market, 107(40) Mar. 2, 1999. Breuer et al.;