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The Challenging Gold Flotation From Copper Oxide Ores

     

Copper oxide ore is one of the critical ore sources for gold extraction. However, the gold flotation process for copper oxide ores is confronted with numerous difficulties. the reasons behind the challenging gold flotation from copper oxide ores from the following aspects:

First, gold in copper oxide ores is often paragenetically associated with multiple minerals with significantly different properties, making effective separation extremely hard during flotation. The separation difficulty is further aggravated especially when gold occurs as ultra-fine particles or inclusions.

Second, gangue minerals in copper oxide ores, including siliceous, calcareous and ferrous gangue, also exert adverse impacts on gold flotation. The presence of these gangue minerals reduces the selectivity of flotation reagents, making it difficult to achieve precise collection of gold.

Third, conventional flotation reagents usually deliver unsatisfactory performance for gold flotation from copper oxide ores. This is because copper oxide minerals themselves have strong hydrophilicity, which makes it hard for collectors to penetrate the hydration film on the surface of copper oxide minerals and act on the target mineral surfaces.

In addition, the gold flotation process for copper oxide ores involves control of multiple links and various technical parameters. Factors including grinding fineness, reagent dosage and flotation time all impose significant effects on flotation performance. However, due to variations in ore properties and limitations of flotation equipment, these technical parameters are often difficult to control precisely.

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