Separating copper from lead in sulfide ores has long been a tough challenge in mineral processing—similar floatability, complex intergrowth, and Cu²⁺ activation of galena all make clean separation difficult. Worse still, conventional circuits rely on highly toxic reagents such as cyanide or dichromate, creating severe environmental pressure and high wastewater treatment costs.

BK520 is BGRIMM's answer.

"Depress Copper, Float Lead" – Precisely Engineered

Developed on BGRIMM's targeted flotation reagent design platform, BK520 uses molecular simulation to reveal the relationship between mineral surface active sites and reagent interaction—shifting reagent development from "trial-and-error" to "precision design."

Its core innovation lies in a macromolecular organic compound composite design that forms a selective adsorption film on copper mineral surfaces, achieving targeted depression of copper while hardly affecting lead minerals. This "depress copper, float lead" route solves the poor selectivity of conventional depressants.

Green by Design

· Low toxicity, readily biodegradable 

· Replaces cyanide, dichromate, and NaHS—eliminating hexavalent chromium and heavy metal pollution at the source 

· Significantly reduces tailings environmental treatment costs 

Proven Metallurgical Performance

In industrial and pilot applications, BK520 delivers:

· Pb in Cu concentrate & Cu in Pb concentrate: both <1.50%, separation factor reaching 30—industry-leading 

· Cu grade & recovery: +1 to +3 percentage points 

· Pb recovery: +1 to +3 percentage points 

Representative test results on a Cu-Pb bulk concentrate:

· Lead concentrate: Pb 74.85% grade, 92.79% recovery, Cu only 2.61% 

· Copper concentrate: Cu 21.23% grade, 89.86% recovery, Pb 5.34% 

Commercially Ready

BK520 is produced at 10,000-ton annual capacity at BGRIMM Chemical base, supplying mines worldwide.

A precise, green breakthrough for one of flotation's toughest separation challenges.