Effect of Regrind on Grade and Recovery

Evaluate the need for regrind

How do you know if or when regrinding and applying further liberation power can improve your metal’s recovery? Below here is data showing what is to be gained by correctly applying regrind to a copper stream. On the graph, the red/white dot points to where the plan currently is light green Grade-Recovery curve VS where is could be on … Read more

Evaluate Oxide Copper Recovery by Flotation

If the idea is try to recover, by flotation, copper oxides that are located in the upper part of the deposit. According to geology department the main copper oxide minerals are chrysocolla and atacamite. There are small quantities of azurite and malachite. As far as I know, it is difficult to float chrysocolla. Malachite and … Read more

Flotation of Marmatite


The chemical formula for sphalerite and marmatite is (Zn,Fe)S not (ZnFeS2).  The iron and solid solution are in a solid solution and marmatite (there is technically no mineral called marmatite) is referred to as the high iron variety of sphalerite http://en.wiktionary.org/wiki/marmatite They have the same flotation properties and the high iron content makes the sphalerite … Read more

Flotation Column Design

Flotation Column Design

Here is a classic Flotation Column Design with air spargers, froth launders and wash water header/tub.  Column Flotation Cells make great “grade machines” but are know as weak on recovery.  Low energy, low recoveries at each end of the size particle spectrum.

Flotation Reagent Metering Pumps

Flotation Reagent Metering Pumps

I recently did a reagent plant trial and worked with a pretty nice flotation reagent metering pumps.  The pump is supplied by http://www.pmps.co.za This portable reagent supply unit is a mechanical diaphragm metering pump.  As see on http://www.pmps.co.za/obl-mechanical-diaphragm-dosing-pump They even had “Water Driven Pumps” Other pumps I never worked with include http://www.awe-ltd.co.uk/products/dosing_pumps_electronic.html and http://www.lutzjescoamerica.com/index.php?id=1645   Also https://www.911metallurgist.com/blog/mibc-frother-pump

Sodium Metabisulfite MBS for pH Control and Pyrite Depression in Flotation

sodium metabisulfite ph

Sodium Metabisulfite aka MBS is used for pH control in froth flotation to control Pyrite depression.  Below is a graph showing pH VS pyrite recovery at various collector addition rates. It is also used to prevent flotation of sphalerite by copper activation in the presence of Tennantite/Covellite in the ore. For pyrite flotation, you see maximum iron/pyrite … Read more

Disseminated Ore Deposits | Complex Polymetallic Mineralogy

You do not know what Disseminated Polymetallic Ore Deposits or Complex Mineralogy until you have seen a QEMSCAN like this: With simple main observations as crazy as these below. ***The proportion of each mineral liberated at a 56µm grind P80 was: Chalcopyrite — 36% liberated Galena — 12% liberated Sphalerite — 45% liberated Pyrite — 85% liberated … Read more

Optimum Froth Bed Depth Levels

froth bed level

When the pulp levels on all cells appears high (shallow froth bed thicknesses or depth).  This causes unstable froth which constantly produces a low density “run-away” or wet, watery un-drained rougher concentrate rich in mechanically floated (entrained) “other materials” and containing most of the frother (added to flotation feed) itself.  ** Operating at shallow froth … Read more