The order of processes involved in the dressing of an ore is (i) grinding and crushing (ii) hand-picking (iii) pulverization (a) (i), (ii), (iii) (b) (i), (iii), (ii) (c) (ii), (iii), (i) (d) (ii), (i), (iii)

Ore dressing begins with the process of 'grinding and crushing', which breaks down large chunks of extracted ore into smaller, more manageable pieces. This stage is crucial because it increases the ore's surface area, allowing for more efficient subsequent processing. Essentially, 'grinding' refers to the process of reducing the ore to fine particles using various types of mills, such as ball mills or rod mills. On the other hand, 'crushing' involves applying force to the ore to break it apart into smaller segments, typically using jaw crushers or gyratory crushers.

When addressing improvements in the exercise, it's essential to clarify that grinding and crushing are not identical, and each serves its specific purpose in the mineral processing workflow. Grinding is associated with finer particle sizes, whereas crushing is related to coarser chunks. Understanding the difference between these terms is vital for grasping the overarching concepts of the entire ore dressing procedure.

Following 'grinding and crushing', the next step is 'hand-picking'. This process is exactly what it sounds like – workers visually inspect the crushed ore and physically remove the valuable minerals from the waste rock. Hand-picking is a selective process and can be time-consuming, but it's of particular importance when dealing with heterogenous ores where the valuable materials can be distinguished by the naked eye based on their color, size, shape, or other physical properties.

While this might seem outdated, it's a practical, low-cost method used especially in the initial stages of processing or when the concentration of valuable minerals is relatively high. For students, visualizing this practice can be helpful. It demonstrates an old yet straightforward method where human judgment aids in the separation of valuable ores from the less valuable rock before further refined and more expensive processes are utilized.

The final step discussed in the textbook is 'pulverization', which further reduces the already crushed ore into a fine powder. This process is carried out through various milling or grinding equipment that exposes more of the minerals' surface area, making it easier for extraction and separation techniques that follow, such as flotation or magnetic separation. The goal is to liberate the valuable mineral grains from the surrounding waste rock so that the subsequent concentration process is more effective.

It's valuable for educational content to underscore that pulverization must be carefully controlled. Over-pulverization can lead to unnecessary production of very fine particles that can interfere with ore processing. It's a balance between achieving a particle size fine enough for liberation while avoiding excessive fines that may be lost in further processing steps.