Nickel, cobalt, and copper can be extracted from their ores as ammine complexes using aqueous ammonia.
Kim, T. H. & Lee, Y. Y. Pretreatment of corn stover by soaking in aqueous ammonia at moderate temperatures.
The resulting solution is contacted with aqueous ammonia, first precipitating hydrated thorium phosphate as a gelatinous mass and then metathesizing the thorium phosphate to thorium hydroxide.
Then, 1.67 mL of hydrazine hydrate (85%, wt %) and 3.33 mL of aqueous ammonia solution (25 28%, wt %) were added into the mixed solution, respectively.
It is also soluble in aqueous ammonia or potassium cyanide in the presence of oxygen because of the formation of very stable cyano complexes upon dissolution.
The impregnated fibres are treated with aqueous ammonia, producing thorium hydroxide, Th(OH 4, and this compound is calcined to produce ThO2.
From acidic solutions, uranium is precipitated by addition of neutralizers such as sodium hydroxide, magnesia, or (most commonly) aqueous ammonia.
The tungstic acid is then dissolved in aqueous ammonia at 60° C (140° F) for two hours under stirring.
Higher concentration of aqueous ammonia from 5 to 20 wt% enables higher CO2 removal efficiency.
Based on the rate-based model, process optimization of CO2 capture by aqueous ammonia was performed.
Fine spray of aqueous ammonia and NaOH solution were used as CO2 absorbent.
