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Outotec's driving force in the design of the zinc silicate leaching process has been ensuring stable operation at high capacity and achieving high zinc recovery. These factors have the greatest impact on the economy of the process. The leaching system is designed as insensitive to disturbances as possible.
Benefits of Outotec oxide and silicate leaching:
- Low investment cost
- Low environmental impact
- Simple process
- Flexible and adaptable
- Optimized reactor design
High zinc recovery is ensured by
- a three-step leaching of the ore
- a high recovery of zinc in the magnesium removal stage
Magnesium bleed will be made from dilute solutions, such as filtrates, or from spent acid in order to allow the use of higher amounts of wash waters.
The three leaching steps will consist of two neutral stages and one acidic, where a moderate acid concentration is used. This system has proved its effectiveness to obtain the two main objectives; a neutral raw solution suitable for the purification as well as high extraction of the zinc oxide and zinc silicate in the feed.
The process is also designed to treat oxidized carbonate material containing chlorine and iron. For these elements as well as for magnesium, a sufficient bleed of solution is provided to keep them under permissible limits. If needed, a chloride removal process can be introduced to keep chloride below the permissible limit.
For further information, please contact  zinc(at)outotec.com
Brochure
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