Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
2008-05-15
2011-10-11
King, Roy (Department: 1733)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C075S770000, C210S710000, C210S722000, C210S724000, C423S144000
Reexamination Certificate
active
08034158
ABSTRACT:
There are provided a method of manufacturing an Fe/Ni-containing material having a low content of sulfur (S) from an Fe/Ni/SO4-containing liquid waste, a ferronickel mass using the Fe/Ni-containing material, and a method of manufacturing the ferronickel mass. The method of manufacturing an Fe/Ni-containing material from an Fe/Ni-containing liquid waste includes: removing SO4from an Fe/Ni/SO4-containing liquid waste by adding an SO4neutralizing agent to the liquid waste so that pH of the liquid waste can be maintained to a pH level of 0.5 to 2.5; precipitating Fe and Ni in the form of hydroxide [(Ni,Fe)(OH)] by adding NaOH to the SO4-free solution; washing the precipitate with water; and manufacturing an Ni/Fe-containing material by filtering and drying the washed Ni/Fe-containing sludge. The method of manufacturing an Fe/Ni-containing material may be useful to suitably apply to the field of recycling of waste acids since an Fe/Ni-containing pellet and a high purity plaster are recovered as the stainless steel material from the waste water at the same time.
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International Search Report for corresponding application No. PCT/KR2008/002701 dated Oct. 8, 2008.
King Roy
McGuthry Banks Tima M
Renner , Otto, Boisselle & Sklar, LLP
Research Institute of Industrial Science & Technology
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