Blogs
Naturally Floating Gold and Silver Lost in Pre-Flotation
It is clear the Pre-Float stage creates much looses in Cu, Au and Ag. Mineralogy work on this stream would help understand why the metals are naturally floatable using only MIBC. Knowing the cause of this floatability (chemical, physical or mechanical) would open the opportunity to implement solutions that would increase Cu, Au and Ag Recoveries by reducing their losses
Copper Oxide Flotation
Continuing with the evaluation of copper oxide flotation using hydroxamate we now evaluate a rock that’s 41% copper oxide with some lead oxide included. Sample B: 1.8% Copper about 41% Oxide Cu Rougher Tests: Unseen in these charts is the order in which the results were obtained. The last/best “Blue” dot (the best data point) was the last test of
The Importance of %Mass Pull in a Flotation Circuit | What is Flotation Mass Pull
What is flotation mass pull and why does it matter so much? If we consider the total Plant Feed of 2800 TPD as 100% of the mass and we produce say 59% Cu Recovery or 84 TPD of Cu conc, we would find that 3% of the “mass” is in the concentrate. We therefore label %Mass Pull as the %
Compare the Benefits of Steel VS Rubber/Poly-Met Mill Liners | When is Steel better than Rubber
When are steel liners better than rubber/poly-met liners in a SAG mill or Ball Mill? Let’s compare! Rubber Liners are better for abrasion grinding ie: cascade action but not for cataract mills. The graph below shows the increased operating cost of rubber and steel liners as the grinding ball size increases. Larger mill, larger ball… increases the cost benefit of
Relationship of Concentration to Specific Gravity in Slurries | Nomograph
https://www.911metallurgist.com/milling-calculations-formulas
Calculate Slurry Flow / Volume
An example of how you can calculate the slurry flow/volume of a given SG, %Solids and Tonnage. EXAMPLE: 3,400 tons of dry solids is processed in 24 hours in water with a specific gravity of 1.0 and the concentration of solids by weight is 33% with the solids having a specific gravity of 3.7 then using the formula below: https://www.911metallurgist.com/calculate-capacity-agitator-conditioner
Relationships between Concentration and Specific Gravities SG of Slurry
Ore specific gravity Pulp Density Relations
Percent Solids to Specific Gravity Conversion of Slurry
Here is the formula for specific gravity of a slurry, S is: S = specific gravity of slurry Si= specific gravity of liquid phase Ss= specific gravity of solids phase Cw = concentration of solids by weight Cv= concentration of solids by volume EXAMPLE: if the liquid has a specific gravity of 1.2 and the concentration of solids by weight is
Filter Cake Moisture Analyzer | Scale to Measure Humidity
Part of your slurry dewatering system is the production of a filter cake. Obviously that cake must have as low a moisture as possible. A great tool you can give your operator to measure, determine and monitor that concentrate filter cake humidity and control their process variable is a moisture scale like this. You just load the scale with 50
How to Size a Cyclone | Hydrocyclone
How to Size a Cyclone or Hydrocyclone has a well establish step-by-step process for which Richard A. Arterburn was a pioneer. Since this paper and its hydrocyclone sizing method is becoming hard to find, I uploaded it on here. Use the 911Metallurgist Online Cyclone Design Calculator. https://www.911metallurgist.com/hydrocyclone-design-equations-and-sizing-parameters-calculations I also include an Excel file prepared by Alex Doll from SAGMilling.com to help
Hydroxamate Collectors
Let me point you to two good papers on the flotation of mixed copper oxide and sulphide minerals with xanthate and hydroxamate collectors. A great detailed thesis called “An Investigation of Copper Recovery from a Sulphide-Oxide Ore with a Mixed Collector System” and one called “Flotation of mixed copper oxide and sulphide minerals with xanthate and hydroxamate collectors” are both must
Bond Work Index Formula-Equation
Table of ContentsBasic EquationsSize Distribution and Exposure RatioEquations for Work Index VariationsWork Index and Crack Energy What is the Bond Work Index Formula-Equation? In case you had forgotten, here is a classic: You can read all the details of this now “Biblical” grinding power requirement calculation formula in Fred Bond’s original paper. You can also review the step-by-step Bond Work Index
Compare Flotation Test Results
Learning how to compare flotation test results made easy: One set of test from Lab A is displayed by the red dots and compare to the blue and/or green data set from Lab B. Lab B is red inferior. Here are the comparative Grade VS Recovery Curves. Metallurgical Efficiency: One of the most important and basic concepts in mineral processing is
Remove Trash from Flotation Circuit via Screen-Box in Grinding Circuit
An on-stream analyzer and small regrind cyclones (their small 1/2″ Apexes) were being plugged by trash coming from the underground mine in the form of wood and plastic. A simple solution was to install a homemade screen box on the cyclone overflow prior to feeding flotation. The operator cleans it daily, thanks to the overhead crane.
Stoichiometric Assays to Mineral Conversion Factors – Stoichiometric
Use the conversion factors in this Table which uses Stoichiometry to approximately convert metal assays to minerals. If you know your sample has only Chalcopyrite as a copper specie, you multiple the %Cu it assays by 2.88 to get the %Chalcopyrite of the sample.
Slurry Stream Sample Cutter Dimensions for Grinding Circuit Survey
A good grinding circuit survey (and flotation circuit sampling) is only as good as the sample cutter used for each slurry stream. Correct sampler volume and opening size insures your sample is representative of the concentrator stream you are testing. Here is a good suggested design with opening dimensions. You need to add the handle that matches your sample point
Schuhmann Plot
A Schuhmann Plot help smooth out particle size data. I attach a graph created for a settling test of flotation concentrates. You draw/create a Schuhmann Plot using the details found in http://technology.infomine.com/enviromine/ard/mineralogy/Size%20&%20Liberation.htm and http://www.chem.mtu.edu/chem_eng/faculty/kawatra/CM2200_2009_HW_3_sizedist.pdf
How to Estimate the Cost of Building a Mine
Here is a Table to help or show you how to estimate the cost of building a mine in today’s market. You can roughly estimate how much is the cost of building a new mine by its rated capacity. The daily plant tonnage MULTIPLIED by $5000 to $25000 of the 2013 US$. A good rule of thumb for any
Benefits of using SART on a Zn laded CN solution | Process
In the absence of SART Process, cyanide is consumed by the leaching of cyanide-soluble zinc minerals present in the ore, generating a WAD cyanide-zinc complex (Zn(CN)42-) in solution. This dissolved WAD CN-Zn complex circulates back to the leach in the recycled Barren Leach Solution (BLS), and further reacts with Ag2S in the fresh ore to form insoluble Zn(CN)2 according to
Gold in Ghana
http://911metallurgist.com/30-Ghana-Gold-Facts 30 insane stats about Ghanaian Gold Mining [Infographic] – An infographic by the team at 911 Metalurgist
Gold CIL & CIP Gold Leaching Process Explained CCD
Table of ContentsLearn CyanidationDevelopments in the Carbon-In-Pulp ProcessDesign CriteriaCommercial Operations Cyanide is a lixiviant, or reagent that is used to leach, often in tanks, gold from a solid matrix and form a gold cyanide complex. The gold cyanide complex is then extracted from the pulp or slurry by adsorption onto activated carbon. CIL stands for carbon-in-leach. This is a gold
Asteroid Mining
http://911metallurgist.com/keep-mining/ Crushing Grinding Gravity Concentration Froth Flotation Leaching (Gold-Silver/Copper or Others) in Tanks or Heap Electrowinning and Smelting Thickening & Filtering / Tailings & Water Treatment Laboratory & General Mineral Processing Categories Concentrator Manuals/Procedures Crushing & Screening Dewatering Equipment Feeders and Conveyors Flotation Flowsheets & Flowcharts Geology Gold Extraction Cyanide Leaching Gold Refining Gravity Concentration Grinding Ball Mills Classification HydroCyclones