A method for nickel nitrate/cobalt solution system transformation and nitric acid reuse
A technology of cobalt solution and nickel nitrate, applied in the direction of improving process efficiency, etc., can solve the problems of non-recyclable nitric acid, generation of waste residue and waste water, high production cost, etc., and achieve the effect of flexible product scheme, low operating cost and small investment
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Embodiment 1
[0020] A nickel / cobalt nitrate solution: Ni 120g / L, Co 0.3g / L, Cu 0.5g / L, Zn 0.3g / L, Fe 0.01g / L. This nickel nitrate / cobalt solution is carried out system conversion and nitric acid recycling, specifically comprises the following steps:
[0021] a. An energy-saving and high-efficiency evaporator is used to evaporate and concentrate the nickel nitrate / cobalt solution, and the water vapor generated during the evaporation process is condensed into water for reuse.
[0022] b. The concentrated nickel / cobalt nitrate solution is subjected to spray pyrolysis at a temperature of 200°C to obtain nickel / cobalt oxide powder, which contains Ni 71.51%, NO 3 - 2.1%, the water vapor generated during the pyrolysis process is condensed into water for reuse, and nitrogen oxides are made into nitric acid for reuse.
[0023] c. Wash the nickel / cobalt oxide powder with water, control the liquid-solid ratio to 1:1, wash the temperature at 20°C, perform two-stage countercurrent washing, and retur...
Embodiment 2
[0028] A nickel / cobalt nitrate solution: Ni 80g / L, Co 1.8g / L, Cu 0.02g / L, Zn 0.3g / L, Fe 0.01g / L. This nickel nitrate / cobalt solution is carried out system conversion and nitric acid recycling, specifically comprises the following steps:
[0029] a. An energy-saving and high-efficiency evaporator is used to evaporate and concentrate the nickel nitrate / cobalt solution, and the water vapor generated during the evaporation process is condensed into water for reuse.
[0030] b. The concentrated nickel / cobalt nitrate solution is subjected to spray pyrolysis at a temperature of 500°C to obtain nickel / cobalt oxide powder, which contains Ni 66.32%, NO 3 - 3.2%, the water vapor generated during the pyrolysis process is condensed into water for reuse, and nitrogen oxides are made into nitric acid for reuse.
[0031] c. Wash the nickel / cobalt oxide powder with water, control the liquid-solid ratio to 5:1, wash the temperature at 80°C, perform two-stage countercurrent washing, return th...
Embodiment 3
[0036] A nickel nitrate / cobalt solution: Co 50g / L, Ni 3g / L, Cu 0.01g / L, Zn 0.25g / L, Fe 0.01g / L. This nickel nitrate / cobalt solution is carried out system conversion and nitric acid recycling, specifically comprises the following steps:
[0037] a. An energy-saving and high-efficiency evaporator is used to evaporate and concentrate the nickel nitrate / cobalt solution, and the water vapor generated during the evaporation process is condensed into water for reuse.
[0038] b. The concentrated nickel nitrate / cobalt solution is subjected to spray pyrolysis at a temperature of 300°C to obtain nickel / cobalt oxide powder. The nickel / cobalt oxide powder contains 70% Co, NO 3 - 2.8%, the water vapor generated during the pyrolysis process is condensed into water for reuse, and nitrogen oxides are made into nitric acid for reuse.
[0039] c. Wash the nickel / cobalt oxide powder with water, control the liquid-solid ratio to 2:1, wash at 40°C, perform two-stage countercurrent washing, and ...
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