| 摘要 |
<p>PURPOSE:To refine nickel in simple stages with high efficiency by reducing nickel oxide in ore then adding this as an aq. nickel ammine salt soln. to coal, and recovering nickel from the residues obtained by gasifying such coal. CONSTITUTION:Nickel ore which is ground to small grain sizes is roasted by a reducing gas at about 400-800 deg.C, whereby nickel oxide is reduced to metallic nickel. Nickel is leached in the presence of O2 in an aq. ammonical ammonium carbonate soln. or the like in the presence of ammonia, whereby an aq. nickel ammine salt soln. is obtained. Coal is impregnated with the aq. nickel ammine salt soln. formed in this way to adsorb nickel ammine salt on the coal, after which the ammonia separated and further gasifying agents such as steam, CO2, H2, O2 and the like are introduced to gasify the coal catalytically at relatively low temps. above about 450 deg.C, whereby the fuel gas consisting of H2, CO, CH4, etc. is obtained. The nickel ammine salt turns to metallic nickel and form solid residues together with the ashes in the coal.</p> |
