1. Magnetic Separation: Iron is a magnetic metal, while zinc is non-magnetic. Place a powerful magnet near the mixture. The iron dust will be attracted to the magnet and can be easily separated from the zinc dust.

2. Density Separation: Zinc dust has a lower density (7.14 g/cm³) compared to iron dust (7.87 g/cm³). This difference in density can be utilized for separation.

- Suspend the mixture in a liquid with a density intermediate between that of zinc and iron, such as methylene iodide (density: 3.32 g/cm³).

- The iron dust will sink to the bottom of the container due to its higher density, while the zinc dust will float on top.

- Decant the liquid containing the zinc dust and collect the settled iron dust from the bottom.

3. Chemical Separation: Zinc can be selectively dissolved from the mixture using a suitable chemical reagent.

- Dissolve the mixture in dilute hydrochloric acid (HCl). Zinc will react with HCl to form zinc chloride (ZnCl₂), which is soluble in water.

- Iron remains unreacted and can be filtered out from the solution.

- The zinc chloride solution can be subjected to further processing to obtain pure zinc.

4. Electrostatic Separation: This method utilizes the differences in the electrical properties of the two metals.

- Introduce an electrostatic charge to the mixture. Typically, a high-voltage electric field is created using a Van de Graaff generator or similar equipment.

- The charged particles in the mixture will be attracted to oppositely charged electrodes based on their electrical charges.

- Zinc dust particles tend to acquire a positive charge, while iron dust particles acquire a negative charge. By placing appropriately charged electrodes, the two types of dust particles can be separated and collected separately.

These methods can be used individually or in combination to effectively separate iron dust and zinc dust. The specific choice of method may depend on the scale and specific requirements of the separation process.