Experimenis and theoretical considerations as to the separation of cobalt from nickel with the NaClO alkali solution were carried out, The author came to the conclusions as follows:
1. When chlorine gas is introduced into a NaOH aqueous solution in order to produce a NaClO solution, one should not use an excess of chlorine gas in order that some NaOH may be left.
2. It is an easier operation that after maintaining the mixture of NiSO
4 and CoSO
4 solution in slightly acidic state the NaClO solution is added.
3. It is necessary to agitate the mixture of NiSO
4 and CSO
4 solution after adding the NaCiO solution.
4. As to the recovery of Co and the efficiency of the NaC
lO solution the results at 50°C is I. 3 mal better them at 20°C, and filtraion and washing of the former are easier.
5. In case of 50°C, when about the theoretical amount of the NaC
lO solution, c mposed of free NaOH (g/L)/available chlorine (g/L) =2-2.5, is added, the recovery of Co and the effei-ency of the NaClO solution and the purity of the products are good. The filtration and the washing are very easy.
6. In the figure which shows the results of the experiment that a theoreticar amount of the NaC
lO soution is added, the poins which show the recovery of Co and the ef iciency of the NaC
lO solution, lie on the curve that depends not oa the concentration of the NaC
lO solu-tion, but on the ratio of free NaOH (g/L)/available chlorine (g/L).The inclination of the curve varies with the temperature.
7. When the ratio of free NaOH (g/L)/available chlorine (g/L) is the same, the greater the cont nt of available chlorine is the better the purity of the procduct.
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