| 摘要 |
The recovery of metal values such as nickel from a metal bearing source such as lateritic ores in which the metal bearing source is subjected to a reductive roast at an elevated temperature in the range of from about 700 DEG to about 1300 DEG F. in contact with at least one additive and thereafter extracting the metal bearing source in an ammoniacal solution whereby the desired metal such as nickel is leached out and recovered, the yield of the desired metal may be increased by subjecting the source to an annealing process during the reductive roast thereof.
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