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Extractive metallurgy of ferromanganese crusts from the Necker Ridge Area, Hawaiian Exclusive Economic Zone.
Haynes BW; Magyar MJ; Godoy FE
Mar Min 1987 Mar; 6:23-36
This paper describes preliminary metallurgical tests on a crust sample recovered from the necker ridge area of the Hawaiian exclusive economic zone to determine potential processing alternatives. Three processes were chosen for use in the program: the cuprion ammoniacal leach process, a high-temperature and high- pressure sulfuric acid leach process, and a smelting process. Test results from these three processes indicate that the sulfuric acid process and the smelting process give higher cobalt and nickel extraction than the cuprion ammoniacal process. The sulfuric acid process extracted greater than 90% of the cobalt, nickel, and copper while rejecting most of the iron and manganese. The smelting process recovered 98% of the cobalt and nickel and 96% of the copper, rejecting 99% of the manganese and 18% of the iron in the initial smelting step. Tailings and slag generated in the processes were tested using the extraction-procedure toxicity test and were classified as nonhazardous under current regulations.
OP; Journal Article
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