I. Overview
Messi Biology said that cobalt is a metal with a very wide range of uses. There are generally two methods for extracting cobalt from nickel cobalt containing ores, one is pyrometallurgy and the other is hydrometallurgy. Because hydrometallurgy has the advantages of low energy consumption, low pollution, and environmental protection, it has been widely used in recent years. In particular, activated magnesium oxide plays an indispensable role in cobalt refining.
II. Two-stage cobalt leaching process
The current DRC cobalt extraction process, including the nickel and cobalt ore into a slurry, acid leaching, to get the leaching slurry, using two-stage leaching process. The purpose of doing so is to achieve more leaching rate of copper, nickel and cobalt in the ore, especially the role of magnesium oxide in which can be maximized, the following look at the two-stage cobalt leaching process.
1, a section of cobalt: to the cobalt to add such as the concentration of about 10% of magnesium oxide, control ph value, cobalt sinking reaction for about four hours, after the reaction is completed, the solid-liquid separation, to get cobalt hydroxide products and cobalt sinking liquid.
2, the second section of the cobalt precipitation: to the cobalt precipitation liquid with milk of lime, control the ph value, continue to cobalt precipitation reaction for one to two hours, after the completion of the reaction will be separated from the solid-liquid, to get the second section of the cobalt precipitation residue and cobalt precipitation liquid, cobalt precipitation liquid after the treatment of the standard discharged.
III. Advantages of refining cobalt with magnesium oxide
Messi Biology said that the activated magnesium oxide cobalt extraction process is an efficient method for recovering cobalt from low-grade cobalt ores. It uses a two-stage cobalt precipitation process to obtain qualified cobalt hydroxide, realizing the utilization of low-grade cobalt ore resources and active oxidation. Compared with the existing technology, the magnesium cobalt extraction process has the following advantages:
1. Use a combination of two-stage cobalt sedimentation slag and finely ground low-grade cobalt ore to remove iron. On the one hand, it saves the cost of iron removal agents and recovers the cobalt in the two-stage cobalt sedimentation slag. On the other hand, it consumes finely ground low-grade cobalt ore in advance. Most of the carbonic acid in the iron removal and neutralization slag returns to the first step of leaching cobalt, which greatly reduces the amount of sulfuric acid used.
2. Using a special oxidant for manganese removal, it is green, environmentally friendly, has high manganese removal efficiency and will not affect the quality of cobalt hydroxide products.
3. The production line formed by the activated magnesium oxide cobalt extraction process has the advantages of simple operation, strong adaptability, high cobalt recovery rate, good cobalt product quality, low production cost, and environmental protection. It can provide broad prospects for the development of low-grade cobalt mines at home and abroad. space.