Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Reexamination Certificate
2009-01-09
2011-10-25
Mayes, Melvin (Department: 1732)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
C429S138000, C429S140000, C429S146000
Reexamination Certificate
active
08043585
ABSTRACT:
A process for recovering metals such as Ni, Co, Mn, Cu, Zn, among others, through precipitation as sulphides, enabling recovery of magnesium in the form of hydroxide, carbonate and oxide and providing recovery of sulphate as gypsum and ammonium sulphate. Liquid phase, after full treatment, comprises recovered water with a quality proper for total reuse in industrial process.This process of liquid and solid effluent treatment is provided with flexibility to process several types of effluents presenting wide variations in their chemical composition. The main steps of this process are: (1) equalization of liquid effluent, (2) precipitation of metals as sulphides, (3) oxidation of metallic sulphides and crystallization as metallic sulphates, (4) precipitation of magnesium as hydroxide and calcination thereof into magnesium oxide (5) recovery of ammonia, (6) preconcentration of the remaining saline solution, (7) evaporation/crystallization of ammonium sulphate, (8) storage of recovered water, (9) partial or total precipitation of sulphate contained in the effluent with quicklime, (10) segregated storage of gypsum and gypsum-magnesium mixture, (11) softening of the remaining solution and (12) storage of softening water.
REFERENCES:
patent: 2145816 (1939-01-01), Stoops
patent: 3468624 (1969-09-01), Miller et al.
patent: 3595610 (1971-07-01), Brinkman et al.
patent: 4152196 (1979-05-01), Buhlmann
patent: 6861041 (2005-03-01), Hyvrard et al.
patent: 7387767 (2008-06-01), Campbell et al.
patent: 7553462 (2009-06-01), Feldmann et al.
patent: 1346524 (1972-10-01), None
Evelin Salomao Solino
Silva Roberto Mattioli
Arent & Fox LLP
Mayes Melvin
Vale Inco Limited
LandOfFree
Liquid and solid effluent treatment process does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid and solid effluent treatment process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid and solid effluent treatment process will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4263112