Lead-Zinc Differential Flotation Plant

Precision selective flotation plants separating galena (lead) and sphalerite (zinc) from complex poly-metallic ores.

1. Process Overview & Flowchart Explanation

The Lead-Zinc Differential Flotation Plant selectively separates complex galena (PbS) and sphalerite (ZnS) mineral associations. The ore is crushed by PE Series Jaw Crushers and milled in Mineral Processing Ball Mills with Spiral Classifiers and Hydrocyclone Separators to ensure fine liberation of interdependent lead and zinc crystal grains.

In the first differential flotation stage, zinc depressants (zinc sulfate and sodium cyanide) are added to inhibit sphalerite while SF-XJ Self-Aeration Flotation Machines float galena, producing lead concentrate. The tailings are then conditioned with copper sulfate to reactivate the sphalerite, followed by xanthate collectors in a secondary SF-XJ flotation bank to float zinc concentrate. Both concentrates are thickened in High Efficiency Thickeners and filtered via Disc Vacuum Filters.

2. Technical Advantages & Features

• High Selectivity & Purity: Produces distinct, clean lead concentrate (>55% Pb) and zinc concentrate (>50% Zn) with minimal mutual contamination.
• Self-Priming Flotation Cells: SF-XJ mechanical cells draw pulp and atmospheric air simultaneously, supporting flexible horizontal layout schemes.
• High Processing Stability: Adaptable to variable feed grades and fluctuating ore mineralogy through automated reagent control.
• Complete Concentrate Dewatering: Integrated high-efficiency thickeners and vacuum disc filters yield dry concentrate ready for smelting.