Nalco Company

Ecolab USA Inc.

Timothy La

John David Kildea

Ji Cui

Everett C Phillips

Kailas B Sawant

David H Slinkman

Carl Nicholas Urbani

Kevin O'Brien

Frederick J Swiecinski

Kim Richard Coleman

Kevin L O'Brien

Carl Nicolas Urbani

The invention provides methods and compositions for inhibiting the accumulation of DSP scale in the liquor circuit of Bayer process equipment. The method includes adding one or more GPS-surfactant based small molecules to the liquor fluid circuit. These scale inhibitors reduce DSP scale formation and thereby increase fluid throughput, increase the amount of time Bayer process equipment can be operational and reduce the need for expensive and dangerous acid washes of Bayer process equipment. As a result, the invention provides a significant reduction in the total cost of operating a Bayer process.

Surfactant based small molecules for reducing aluminosilicate scale in the Bayer process

The invention provides a method of inhibiting the accumulation of DSP scale in the liquor circuit of Bayer process equipment. The method includes adding one or more particular silane based small molecules to the liquor fluid circuit. These scale inhibitors reduce DSP scale formation and thereby increase fluid throughput, increase the amount of time Bayer process equipment can be operational and reduce the need for expensive and dangerous acid washes of Bayer process equipment. As a result, the invention provides a significant reduction in the total cost of operating a Bayer process.

Reducing aluminosilicate scale in the Bayer process

Reducing aluminosilicate scale in the bayer process

Surfactant based small molecules for reducing aluminosilicate scale in the bayer process

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.

Approach in controlling DSP scale in bayer process

Growing community of inventors

Kardinya, Australia

Timothy La