Approach in controlling DSP scale in bayer process

Details Approach in controlling DSP scale in bayer process Approach in controlling DSP scale in bayer process

2009-04-06

2011-10-04

Langel, Wayne (Department: 1736)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

Reexamination Certificate

active

08029752

ABSTRACT:
The invention provides a method of controlling silica in the liquor circuit of the Bayer process. The method involves addition of a promoter material to enhance the precipitation of DSP and includes adding one or more silica dispersion materials or dry silica forms to those parts of the circuit where precipitation of DSP and removal of silica from solution is desirable; for example the desilication stage of a Bayer process plant. The removal of DSP from solution reduces silica concentration in the liquor and thereby enables better control of process issues such as silica contamination in alumina product and DSP formation in later stages of the process where precipitation as scale onto vessel walls and equipment is problematical. As a result, the invention provides a significant reduction in the total cost of operating a Bayer process.

REFERENCES:
patent: 5118484 (1992-06-01), The et al.
patent: 5314626 (1994-05-01), Dimas
patent: 5415782 (1995-05-01), Dimas
patent: 5650072 (1997-07-01), McClain et al.
patent: 6569908 (2003-05-01), Noguchi et al.
patent: 6808768 (2004-10-01), Satou et al.
patent: 6814873 (2004-11-01), Spitzer et al.
patent: 2004/0011744 (2004-01-01), Spitzer et al.
patent: 2004/0162406 (2004-08-01), Spitzer et al.
patent: 2005/0010008 (2005-01-01), Spitzer et al.
patent: 2005/0231436 (2005-10-01), McLean et al.
patent: 2007/0178041 (2007-08-01), Tizon et al.
patent: 2007/0231249 (2007-10-01), Batllo et al.
patent: 2009/0008335 (2009-01-01), Flocken et al.
patent: WO 960643 (1996-02-01), None
patent: WO 97/41065 (1997-11-01), None
patent: WO 97/41075 (1997-11-01), None
patent: WO 2006/003470 (2006-01-01), None
patent: WO 2008/045677 (2008-04-01), None
Product Silica Control Options, by B. J. Robson, p. 87,Light Metals(1998).
A Novel Approach to Post-Desilicating Bayer Process Liquor, by K. I. The, p. 117,Light Metals(1998)
Max HT Sodalite Scale Inhibitor: Plant Experience and Impact on the Process, by Donald Spitzer et al., pp. 57-62,Light Metals 2008(2008).
Performance Appraisal of Evaporation System with Scale Inhibitor Application in Alnorte Plant, by A. Oliveir.

Affiliated with

Also associated with

Rating

Approach in controlling DSP scale in bayer 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 Approach in controlling DSP scale in bayer process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Approach in controlling DSP scale in bayer process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4272017