Pyrite Depression in Copper Flotation

The Pyrite Depression in a Copper Only Flotation circuit is simple enough.  If your froth flotation system only tries to recover chalcopyrite-copper, you need to bring the plant’s pH up to the other side (right side) of the PYRITE curve.  The more flotation collector you have on, the higher you will need to increase that pH … Read more

Copper Lead Concentrate Separation

The ways to obtain successful Separation of Copper and Lead into individual Concentrates, several process approaches can be examined; bulk copper-lead flotation with a reverse flotation stage depressing copper, the same bulk flotation with a reverse flotation to depress lead and a sequential copper-lead-zinc flotation circuit as well as a simple cleaning of the bulk Cu/Pb concentrate by Pb … Read more

Arsenic in Copper Concentrate

Arsenic in Copper

In a certain case study of “high” Arsenic in Copper Concentrate (almost 0.5% As) produced by flotation, and where the Cu Conc is mostly  chalcopyrite and therefore the main form of copper; the content of secondary copper minerals was variable. Tennantite/Enargite/Freibergite, a copper-arsenic sulphide mineral, as well as covellite, was present in significantly higher amounts today. … Read more

Cyanide Concentration and pH to Depress Sulphides

NaCN Cyanide and pH flotability of sulphides

The chart displays how the Cyanide Concentration (how much NaCN) is needed to effectively Depress Sulphides like Pyrite, Sphalerite, Chalcopyrite but not Galena at various pH. It is pH that affects/impact the required effective concentration of cyanide.  The higher the pH, the less NaCN is needed as CaO/Lime also acts as a Sulphide depressant.  The use of … Read more

Lead Depression in Bulk Cu/Pb Flotation Concentrate (Reverse)

A series of tests were completed with bulk copper and lead flotation with the depression of lead and flotation of copper. This alternative utilized MBS as the primary depressant in both the bulk and reverse circuits. The challenge of this scheme is that the lead concentrate will be the tailings of the reverse circuit and will likely … Read more

Fluorine Dispersion

In some cases, Mica carries Fluorine.  If you can not pre-float that Mica, you may want to try the Fluorine Dispersant below. Product: Oxfloat 25P      – Metaphosphate As a mining chemicals for flotation treatment of multi-metallic ores Preparation: Make 2% solution in water. Dissolves readily. Dosage for good dispersion: Dosage between 100 – 1000 g/t. Product: … Read more

Copper – Lead Separation by Lead Depression

Another method to separate Pb from Cu is in depressing the lead away from the copper to float. Here, three batch cleaner tests were performed with additional depressants to reject more lead from the copper flotation concentrate. The baseline test utilized no MBS depression in the rougher circuit to maximize copper recovery, but MBS depression in the copper … Read more

Sequential Copper–Lead–Zinc Flotation

To improve the selectivity between copper and lead, a sequential copper-lead-zinc rougher circuit was tested. Each of the rougher circuits had a dedicated regrind and cleaner circuit. The advantages of the sequential circuits are that the levels of selectivity can be increased, particularly for copper and lead. With this process, copper was recovered first with MBS depression of lead, … Read more