Understanding Your Market Needs

Hydrometallurgy is a large family of processes in a liquid form to recover metals from ores, concentrates and brines. The main two examples include the Bayer process for alumina production, zinc, nickel and lead extraction by leaching in a multi-step process, plus direct leaching of gold from ores. Most of the hydrometallurgical processes are complex and multi-step. Specialized chemicals are required at each step of these processes, either to recover the metal or to refine it by removing impurities. An alkalising step is included in most hydrometallurgical processes. These processes are made more efficient by ensuring the right choice of chemicals and their purity.

Solutions to Meet Your Needs

Lime is the most available and cost-effective alkali chemical used in hydrometallurgical metals recovery, such as:

  • 3 key steps of the Bayer process producing alumina from bauxite.
  • pH buffering for gold extraction by cyanide leaching.
  • Impurities removal in nickel, lead, and in zinc extraction from concentrates.
  • Impurities removal in lithium extraction from brines and hard rock.

Lime is mostly used in a liquid form (milk-of-lime), prepared at on-site liming units. Lime quality and best operation practices at a milk-of-lime unit are crucial for the efficiency of the metals leaching or refining processes.

Carmeuse has developed the AquaCalco® product range specifically for ore flotation and hydrometallurgical processes. This specialized range also includes ready-made milk-of-lime in a range of concentrations.

  • AquaCalco® Q
  • AquaCalco® S
  • AquaCalco® M

Mining & Non-Ferrous

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metal ore rocks
Ore Processing