Liquid purification or separation – Processes – Chemical treatment
Patent
1990-10-19
1992-11-03
Spear, Frank
Liquid purification or separation
Processes
Chemical treatment
210904, C02F 166
Patent
active
051606372
ABSTRACT:
The invention provides an apparatus for continuous thermal hydrolysis of cyanide ions and cyanide-containing ions contained in a liquid, comprising an elongated tubular reactor of a size selected to enable the liquid to be retained in the reactor for a predetermined reaction time, a conduit for supplying the liquid to the reactor, means for adding a base to the liquid prior to heating, and means, associated with the conduit, for instantaneously and uniformly heating the liquid to a preselected temperature. The apparatus preferably uses high pressure steam to heat the liquid and appears much less subject to fouling by scale.
The invention also provides a continuous process for hydrolyzing a cyanide-containing liquid stream, comprising adjusting the pH of the liquid stream to render the liquid stream strongly basic; rapidly and uniformly heating the liquid stream to a predetermined elevated temperature; feeding the liquid to an elongated substantially vertical tubular reactor; maintaining the liquid in the reactor for a predetermined time to permit substantially complete degradation of cyanide ions and cyanide-containing ions in the liquid. The cyanide-containing liquid may preferably be uniformly and rapidly heated to the desired temperature by injecting steam under pressure into the liquid.
REFERENCES:
patent: 4042502 (1977-08-01), Schmidt
patent: 4468376 (1984-08-01), Suggitt
patent: 4812243 (1989-03-01), Brandenburg
patent: 4877519 (1989-10-01), Robey
PCT/CA91/00363, International Publication Date: Oct. 10, 1991.
Kimmerle, F. M., et al., "Cyanide Destruction in Spent Potlining", Light Metals, 1989 (P. G. Campbell, (E.D.)), pp. 387-394.
Kimmerle, F. M., et al., "Hydrolysis Treatment of Cyanide in Spent Potlining Leachate", Presented at 27th Annular Congress of Metal-Lurgists--1988, CIT, Montreal 1988, pp. 1-13.
Kimmerle, F. M., et al., "Process Effluents in the Aluminum Industry: Problems or Opportunities?", Canadian Institute of Metallurgy, Halifax, Canada, Aug. 1989.
Bell David H.
Fortier Joseph E. F.
Havens Haven M.
Alcan International Limited
Spear Frank
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