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Process Research Ortech Inc.

Md Abdul Halim

Vaikuntam Iyer Lakshmanan

Ramamritham Sridhar

Jonathan Chen

Robert J DeLaat

Processes for the removal of arsenic from aqueous solutions such as contaminated waters and process solutions are disclosed. Arsenic is removed from process solutions/effluents either by precipitation with a soluble iron compound, or solvent extraction and subsequent treatment with engineered materials, such as granular iron oxide. Arsenic may also be directly removed from arsenic contaminated ground and/or surface waters using engineered materials, especially by contacting ground and/or surface waters with silica, granular iron oxide and optionally natural zeolite in sequence. The treated solutions/effluents and waters may be released into the environment.

Removal of arsenic from contaminated aqueous solutions

The invention provides a process for the leaching of a laterite ore or concentrate for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore. Nickel is extracted with an oxime at a lower pH than other processes for extraction of nickel from solution, especially after separation of iron and cobalt values.

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Mississauga, Canada

Md Abdul Halim