Recovery of valuable substances

Details Recovery of valuable substances Recovery of valuable substances

1995-07-14

1997-09-09

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423140, 423184, 423199, 423311, C01B 2532

Patent

active

056653247

ABSTRACT:
Valuable substances are recovered from a spent electroless nickel plating solution containing a water-soluble nickel salt, organic complexing agent, hypophosphite, phosphite, and alkali metal ion by adding oxalic acid to the plating solution for causing a nickel ion to precipitate as nickel oxalate for removal and recovery; optionally adding a sulfide to the plating solution for causing a heavy metal ion to precipitate as a heavy metal sulfide for removal; adding a mineral acid and calcium oxide, calcium hydroxide, calcium carbonate, calcium sulfate, calcium chloride or a calcium salt of organic acid to the plating solution from which the nickel ion has been removed; firing solids of the solution in air for converting the alkali metal ion into an alkali metal salt of mineral acid, converting phosphorus into hydroxyapatite, and pyrolyzing off the organic material; and pouring a solid mixture of the alkali metal salt of mineral acid and hydroxyapatite into water for dissolving the alkali metal salt of mineral acid in water for separate recovery of hydroxyapatite and the alkali metal salt of mineral acid.

REFERENCES:
patent: 4481175 (1984-11-01), Iino et al.
patent: 4789484 (1988-12-01), Ying et al.

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