A kind of iron oxide red production method
A technology of iron oxide red and its production method, which is applied in the field of chemical pigments, can solve the problems of high treatment investment and treatment cost, and achieve the effect of reducing production cost and consumption
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Embodiment 1
[0031] Preparation of iron oxide red seed slurry:
[0032] Add 14.32Kg iron sheets and 110Kg water to the seed crystal reactor, heat the medium in the seed crystal reactor to 85°C and seal the seed crystal reactor, add 18Kg of dilute nitric acid with a concentration of 32%, and simultaneously add Introduce oxygen to keep the oxygen partial pressure in the container above 0.1MPa, use a self-priming stirrer to disperse the gas in the seed crystal reactor in the liquid phase, continue the reaction for 90 minutes after adding nitric acid, and prepare iron oxide red crystal kind of slurry. After measurement, the slurry iron oxide red crystal seed 13.76Kg, nitrogen oxide content (in NO 2 Total) is 496mg / m 3 . A slurry containing 2.39Kg of iron oxide red seeds can be prepared per kilogram of nitric acid.
Embodiment 2
[0034] Preparation of iron oxide red seed slurry:
[0035] Add 14.41Kg iron sheets and 110Kg water to the seed crystal reactor, heat the medium in the seed crystal reactor to 85°C and seal the reactor, add 17.2Kg of dilute nitric acid with a concentration of 32%, and simultaneously feed oxygen into the container , keep the oxygen partial pressure in the container above 0.06MPa, use the air compressor to pressurize the gas in the seed crystal reactor and blow it into the liquid phase, the circulation flow rate of the gas is 0.4m 3 / h, after the nitric acid has been added, the gas continues to circulate for 90min, and the reaction ends, and the gas circulation is stopped. The measured slurry contains 13.87Kg of iron oxide red crystal seeds, and the content of nitrogen oxides in the tail gas (in terms of NO 2 Count) is 287mg / m 3 . 2.52Kg iron red seeds can be produced per kilogram of nitric acid.
Embodiment 3
[0037] Preparation of iron oxide red seed slurry:
[0038] Add 14.5Kg iron sheets and 110Kg water to the seed crystal reactor, heat the medium in the seed crystal reactor to 160°C and seal the reactor, add 17.5Kg of dilute nitric acid with a concentration of 32%, and simultaneously feed oxygen into the container , keep the oxygen partial pressure in the container above 0.08MPa, use the Venturi injector to circulate and disperse the gas in the seed crystal reactor in the liquid phase, react for 90min, and the reaction ends. The measured slurry contains 13.82Kg of iron oxide red crystal seeds, and the content of nitrogen oxides in the tail gas (in terms of NO 2 Total) is 352mg / m 3 . A slurry containing 2.46Kg of iron oxide red seeds can be prepared per kilogram of nitric acid.
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