Method for producing nickel-ontaining acidic solution
A manufacturing method and acid solution technology, applied in the field of acid solution, can solve the problems of increased usage, increased cost, increased nickel, etc.
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Embodiment 1
[0072] Residual charge is deactivated by reduction roasting in advance, and at the same time, the used nickel-metal hydride battery that reduced nickel and cobalt to a metal state is disassembled and separated, and the positive electrode material part is taken out. Next, the positive electrode material was cut into pieces using a cutting machine so that the size of one side was controlled within a range of 1 to 5 cm, and 1 kg of the baked positive electrode material was prepared and used in the following steps. In addition, the deactivation treatment of residual charge of the battery by reduction firing was carried out as follows: the used nickel-metal hydride battery was placed in an electric furnace, and the temperature was maintained at 550° C. while flowing nitrogen gas to form an inert atmosphere, and reduction firing was carried out for 1 hour.
[0073] (1) Washing process
[0074] 10 liters of water was added to 1 kg of the calcined positive electrode material, stirred ...
Embodiment 2
[0081] Since the Zn concentration in the nickel solution A obtained in Example 1 was 1.1 [g / L], the dezincification step shown below was implemented.
[0082] (4) Dezincification process
[0083] 1 liter of the obtained nickel solution A was put into a dezincification tank with a capacity of 2 liters. Blow hydrogen sulfide gas into the dezincification tank at a flow rate of 0.3 g / min. Nickel carbonate was added so that the pH of the generated slurry could be maintained in the range of 2.0 to 2.5.
[0084] Stirring was further continued for 10 minutes in this state to perform a reaction. After the reaction is finished, the content of the dezincification tank is filtered out and separated into a solution and a sulfide precipitate to obtain a solution A of dezincification nickel. Table 1 shows the analysis results of the components. As can be seen from Table 1, compared with the nickel solution A, the contained zinc is reduced to about one-tenth, which is Ni / Zn=82-890.
Embodiment 3
[0086] The positive electrode material 1.1kg that is baked the same as embodiment 1 is washed and separated, dried under the same conditions and operation as the (1) water washing process of embodiment 1, to obtain the positive electrode material after washing with a weight of 0.97kg after drying . The water-washed positive electrode material was pickled, separated, and dried under the same conditions and operations as in the (2) pickling step of Example 1 to obtain a pickled positive electrode material weighing 0.94 kg.
[0087] Furthermore, the acid-washed positive electrode material was put into a leaching tank with a capacity of 15 liters, 8.0 liters of water was added, and chlorine gas was blown in from a cylinder as an oxidizing agent at a flow rate of 1 liter per minute while maintaining the liquid temperature at 70°C. After stirring in this state for 8 hours, blowing of chlorine gas was stopped, and a nickel solution D was obtained by filtering.
[0088] The analytica...
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