In recent years, the cobalt industry chain has changed, from cobalt ore to cobalt hydrometallurgy crude cobalt hydroxide, and its import ratio has increased rapidly. As the largest smelting and processing country, China has a huge import volume. Research The crude cobalt hydroxide production process is conducive to further estimating the cobalt production of the Democratic Republic of the Congo, one of which is reactive magnesium oxide precipitation cobalt.
Reactive magnesia is widely used as a cobalt precipitation agent, with less dosage and low cost. It can also save logistics and storage expenses, and is also an environmentally friendly solution for the production of cobalt products. The reactive magnesium oxide produced by Messi Biology Research has small particles and a large ratio of surface atoms to bulk atoms. Due to the existence of a large number of surface atoms and surface defects, the diffusion speed of surface atoms is very fast, so it has extremely high chemical activity. And physical adsorption, very suitable for the precipitation of nickel and cobalt.
3. Practice conclusion
After repeated practice by Messi Biology, it is concluded that two-stage cobalt precipitation, one stage cobalt precipitation using magnesium oxide, and two stage cobalt precipitation using slaked lime, can produce high-grade crude cobalt hydroxide products, and at the same time ensure the recovery of cobalt precipitation High rate.
The results show that when the temperature is around 50°C, the reaction time is 4 hours, and the final pH value is 8.0, the cobalt precipitation effect of magnesium oxide is the best, and the obtained cobalt hydroxide grade is higher than 36% (more than 11% higher than that of traditional sodium carbonate precipitation cobalt ), the cobalt recovery rate is greater than 99%, and the utilization rate of magnesium oxide can reach 91%, which is the best choice for cobalt precipitation agent. The magnesium precipitation wastewater produced in the whole process basically does not contain other metal ions except calcium ions, and can be discharged or recycled after being neutralized to meet the discharge standards, without affecting the environment and ecological development.