Patents Granted (or Pending) to Harris Lowenhaupt:
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4,541,994: Method of Liberating Nickel and Cobalt Enriched Fines From Laterite; Sept. 17, 1985
4,541,868: Recovery of Nickel and Cobalt by Controlled Sulfuric Acid Leaching; Sept. 17, 1985
4,548,794: Method of Recovering Nickel From Laterite Ores; Oct. 22, 1985
3,794,719: Reduction of Nickel Contamination by Zinc; Feb. 26, 1974
A b s t r a c t s
Nickel-Containing Leachate Having Low Aluminum Content
A nickel-containing ore is leached with sulfuric acid to dissolve nickel and associated metallic values into the sulfuric acid to form a leachate, the sulfuric acid further containing a source of the monovalent cations sodium, potassium or ammonium to suppress solubilization of aluminum ions in the ore. The leaching process is conducted at elevated temperatures of from about 200 deg. C. to about 300 deg. C., and at elevated pressures. In such leaching process, the monovalent cations are present in the leaching liquid prior to the initiation of leaching, to achieve an aluminum content of the leachate of less than about 0.5 grams per liter.
Nickel Solvent Extraction/Electrowinnning
A process for electrolytic deposition of nickel wherein nickel is extracted from a nickel-containing liquor by contacting said liquor with an ion exchange medium to bond nickel to said material; nickel is stripped from said ion exchange material by contact with an aqueous mineral acid electrolyte solution having a pH of about 0.5 or higher; the stripped ion exchange medium is again contacted with nickel-containing liquor for extraction of additional nickel; the nickel pregnant aqueous mineral acid electrolyte solution from said stripping operation is subjected to electrolysis to deposit metallic nickel and the electrolyte solution resulting from said electrolysis is recycled to the stripping operation at a rate sufficient to simultaneously remove nickel from the ion exchange medium and to reduce the hydrogen ion concentration of the aqueous electrolyte solution.
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