Device and method for recovering nickel and cobalt and co-producing magnesium oxide

The researchers provide a device and method for recovering nickel, cobalt and magnesium oxide from nickel, cobalt and magnesium waste streams, said device comprising a nickel and cobalt separation and recovery system, a magnesium chemical separation and recovery system, an atmosphere roaster and a crusher connected in sequence. Said method includes:

Firstly, separating and recovering nickel and cobalt from nickel-cobalt-magnesium waste solution by extraction method or sulfide precipitation method, and getting magnesium-containing solution; then adding bicarbonate and ammonia to magnesium-containing solution, and getting alkaline magnesium carbonate after stirring, heating, holding and filtering; then drying and atmosphere roasting the alkaline magnesium carbonate, and getting high-purity magnesium oxide; finally crushing the high-purity magnesium oxide, and getting magnesium oxide products of silicon steel. The invention through the innovative design of the equipment, combination and precise control, to achieve the efficient separation of nickel, cobalt and high-purity magnesium oxide products of low-cost preparation, so that nickel, cobalt and magnesium waste liquid resources to achieve economic and efficient use, has a very broad market prospects.

 

Messi Biology said that the selective precipitation and enrichment of nickel and cobalt from the sulfate medium containing manganese and magnesium by activated magnesium oxide. The results showed that the optimal precipitation conditions were twice the theoretical amount of activated magnesium oxide, the reaction time was 6h, and the precipitation temperature was 25℃. The precipitation rates of nickel and cobalt were 97.96% and 96.43%, respectively. The contents of nickel, cobalt, manganese and magnesium oxide in the precipitates were 8.51%, 13.05%, 2.29% and 4.97%, respectively. When the amount of flocculant AN905 was 0.2g/m3, the average static free settling velocity of the slurry was 180mm/min.