At present, the cobalt products in the cobalt salt plant are crude cobalt carbonate, and sodium carbonate is used to sink the cobalt, and the liquid after sinking the cobalt is directly discharged. The defect of this process is that there is still a large amount of sodium sulfate in the discharged waste liquid, which is not easy to treat, and the direct discharge will cause certain environmental pollution and have a negative impact on water quality. During the dry season, white crystalline sodium sulphate will appear from the discharge outlet and downstream riverbed, which will easily attract attention. At present, the environmental protection policy of DRC is gradually regulated and the law enforcement is gradually strict, and some enterprises have adopted the activated magnesium oxide cobalt sink process to produce cobalt hydroxide, changing the past cobalt carbonate product scheme to reduce environmental pollution. Therefore, it is necessary for cobalt salt plants to improve the process and reduce waste liquid discharge.
The cobalt salt plant has conducted a small trial on this, and the results show that the amount of active magnesium oxide to sink cobalt is about one-half of sodium carbonate, and the price of suitable active magnesium oxide is about twice the price of sodium carbonate, so...
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