What are the differences between lead-zinc oxide ore and lead-zinc sulfide ore?

Main Components

The main constituent minerals of oxidized lead-zinc ore include cerussite and anglesite, which are secondary minerals gradually formed from primary minerals under oxidizing conditions. Oxidized lead-zinc ore is usually associated with pyrite, siderite, etc., forming deposits such as limonite. Oxidized lead-zinc ore has a wide distribution range, and due to its different origins, it often forms rich ore deposits in residual and colluvial deposits.

The main constituent minerals of sulfide lead-zinc ore include galena and sphalerite, which are primary minerals. Sulfide lead-zinc ore is usually associated with pyrite, chalcopyrite, etc., forming polymetallic ores. The reserves and distribution of sulfide lead-zinc ore are far greater than those of oxidized lead-zinc ore; therefore, most lead and zinc metals are extracted from sulfide ores.

Refining Process

1. Oxidized Lead-Zinc Ore

The characteristic of this Oxidized Lead-Zinc Ore is that the lead and zinc in it have already combined with oxygen, like rust. To deal with it, we usually use two methods:

Reduction method: As the name suggests, this involves "taking away" the oxygen, turning the oxides back into pure metals.

Acid leaching method: This involves dissolving it with acid, turning it into a liquid, and then separating the required metals from the liquid.

Both of these methods are very effective in "reducing" the oxides into metals or dissolving them in acid for further processing.

2. Sulfide Lead-Zinc Ore

In this ore, the lead and zinc are combined with sulfur. To refine it, we mainly use two major methods:

Pyrometallurgy (high-temperature roasting): This requires extremely high temperatures. Through chemical reactions at high temperatures, the sulfides are transformed into metallic elements. You can imagine it as "high-temperature roasting,"burning off the sulfur.

Hydrometallurgy (acid dissolution): This is somewhat similar to the acid leaching method above, also using chemical methods such as acid dissolution to extract the metals from the ore.