Which technique allows plants to absorb metals for copper extraction?

Phytomining is a process that allows plants to absorb metals, particularly copper, from the soil through their roots. In this technique, specific plants known as hyperaccumulators are cultivated in areas with metal-rich soils. These plants take up the metals and concentrate them in their tissues as they grow. Once the plants have reached maturity, they are harvested, and the metals can then be extracted from the biomass through subsequent processing, such as burning the plants to release the metals in an ash form or using chemical techniques to refine the metals.

Phytomining is particularly advantageous because it provides a more environmentally friendly method of metal recovery compared to traditional mining methods. It reduces soil and water pollution commonly associated with conventional mining practices, allowing for sustainable metal extraction. This is especially important in areas facing ecological concerns or where conventional mining is not feasible.