Q1: Pick out the wrong statement pertaining to leaching.

ANS:A - Fine solids can not be leached in a Pachuka tank.

The statement "Fine solids can not be leached in a Pachuka tank" is incorrect. In fact, Pachuca tanks are commonly used in the mining industry for leaching processes, including the leaching of fine solids such as ores. Pachuca tanks, also known as air agitation tanks, are vertical cylindrical tanks equipped with a central draft tube and spargers (pipes or diffusers) for introducing air or other gases into the slurry. The introduction of air promotes agitation and mixing of the solid-liquid slurry, enhancing the leaching process. In the case of fine solids, such as finely ground ores, Pachuca tanks are particularly effective because the agitation provided by the air helps to suspend the fine particles evenly throughout the liquid phase. This ensures intimate contact between the solid particles and the leaching solution, facilitating efficient mass transfer and extraction of valuable metals or minerals from the ore. Therefore, Pachuca tanks are suitable for leaching both coarse and fine solids, making the statement "Fine solids can not be leached in a Pachuka tank" incorrect.