Method for preparing reagent cobalt chloride hexahydrate
A technology of cobalt chloride hexahydrate and reagent grade, applied in the field of preparation of cobalt chloride, can solve the problems affecting product quality and production efficiency, difficulty in washing and removing impurities, weak cobalt reducibility, etc., and achieves fast reaction and easy process conditions. Effects of controlled, mild process conditions
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Embodiment 1
[0024] (1) Take 100kg of cobalt flakes and rinse them with 5% dilute nitric acid, put them into a 500L stainless steel jacketed reaction pot, add 100kg of pure water, connect and open the exhaust gas absorption device, then slowly add concentrated nitric acid (concentration ≥99%) to react, during the reaction process, the temperature of the reaction solution is controlled by opening the jacket cooling water and adjusting the nitric acid addition rate to ≤100°C, and brown-yellow gas escapes continuously during the reaction process. When the reaction solution has no obvious bubbles, close the jacket Cool water, slowly heat until the solution boils slightly, drive away the acid until the solution pH=2-3, add 445kg of concentrated nitric acid in the reaction process;
[0025] (2) Dilute the above solution with pure water to a specific gravity of 1.22-1.24, adjust the pH value of the solution to 3.5-4.0 with cobalt carbonate, heat the solution to 60-70°C and keep it warm for 60 minu...
Embodiment 2
[0029] (1) Take 100kg of cobalt flakes and rinse them with 5% dilute nitric acid, put them into a 500L stainless steel jacketed reaction pot, add 100kg of pure water, connect and open the exhaust gas absorption device, then slowly add concentrated nitric acid (concentration ≥99%) to react, during the reaction process, the temperature of the reaction solution is controlled by opening the jacket cooling water and adjusting the nitric acid addition rate to ≤100°C, and brown-yellow gas escapes continuously during the reaction process. When the reaction solution has no obvious bubbles, close the jacket Cooling water, slowly heating until the solution boils slightly, making the solution pH=2-3, adding 440kg of concentrated nitric acid in the reaction process;
[0030] (2) Dilute the above solution with pure water to a specific gravity of 1.26-1.28, adjust the pH value of the solution to 3.2-3.6 with cobalt carbonate, heat the solution to 60-70°C and keep it warm for 80 minutes, add a...
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