Blogs
Precipitation of Copper contained Silver leached out with Copper
Having refractory ore under treatment, it is generally the case that copper is also found in it. While roasting, the presence of copper is favorable for the chlorination of the silver, but copper ores require some more salt, especially if it is intended to save the copper also. The more chloride of copper formed, the more will be found in
Gold Planning
I have been given the opportunity to maybe teach you guys how to pan some gold and find some gold. I’ve been prospecting, my family been prospecting for many years. So we have a good mine just up the road. And hopefully today we can go out and find a little bit of Gold and anybody can go out and
Electromagnetic Separation of Wolframite
Wolframite, sp. gr. 7.1 to 7.5, tungstate of iron and manganese, is feebly magnetic; specimens from some localities are reported to be strongly magnetic. Wolframite frequently accompanies cassiterite in tin ores, and on account of their similar specific gravities (cassiterite 6.4 to 7.02) these minerals may not be separated from each other by specific-gravity methods. The method usually followed in
Particle Size Distribution
Table of ContentsTypes of SievesMethods of Making Particle Size DeterminationsCalibration of ScreensCompare Methods of Particle Size Analysis The use of sieves to separate particulate material into fractions of various sizes has occurred throughout the period of recorded history. Sieving is one of the simplest methods of determining particle size distributions, and is probably used in industrial laboratories more than any
Tailings Belt Filter Press
Table of ContentsTailings Handling SelectionProcess Description Crushed ore is reclaimed in a 3.7 m (12′) diameter tunnel with, two variable speed slot feeders. Mill feed is conveyed to a 3.7 m x 1.2 m (12′ x 4′) 250 hp semi-autogenous (SAG) mill. Lime is screw fed onto the conveyor inside the reclaim tunnel. The SAG mill discharge enters a common sump
Acid Mine Drainage
Hello these is a Brad Striebig and in this section we’re going to talk about what happens to acids in the environment, how they can degrade the environment but also how engineers and scientist can look at that process, understand the acidification process and remediate or restore the area that is impacted by that acid conditions. In this case we’re
Froth Flotation 101 in Video
Discussion flotation and mineral processing with industry metallurgist from around the world. Wetting and not wetting or water-absorbing is the principle of flotation. Some minerals are wetted, whereas others are not wetted. Wetting is a variable property of minerals and depends upon the surface properties of the solid, liquid, and gaseous conditions. Minerals that are wetted do not float, whereas
Rock Blasting
In this topic, we will discuss about blasting. Blasting is an operation that engineers resort to in order to break the rock mass, and to facilitate the removal of the overburden material. Blasting is am operation that has safety, stability, and economical viability issues, and it’s a science itself. First of all, blasting requires explosives. Different explosives have different power
Zinc Box Construction and Operation
Table of ContentsCIRCULAR VATS FOR ZINC PRECIPITATIONCUTTING AND PREPARING THE ZINC SHAVINGSLEAD-ZINC COUPLECHARGING THE ZINC INTO THE BOXESCONDITIONS WHICH INFLUENCE PRECIPITATIONInfluence of Suspended MatterInfluence of Free CyanideInfluence of AlkaliRate of FlowNature of the Precipitating SurfaceDIFFICULTIES IN ZINC PRECIPITATIONDeposits Formed by Action of Solution on ZincOther Deposits Due to Subsidiary Reactions“ Metallic ” CoatingsConsumption of ZincNON-ACCUMULATION OF ZINC IN THE SOLUTIONSTESTS
Sizing and Metallurgical Testing
Table of ContentsSize DistributionSize Distribution FunctionsSize Distribution ExpressionsMeasuring SizeScreeningCyclosizingEnhanced Fine Sizing ProcedureSizing by CyclosizerBasis of Size CorrectionOther Particle PropertiesOther Metallurgical Testing Size is crucial to virtually all mineral processing A size range in a standard series is generally identified by the bottom size in the range A single size parameter is not enough to define a size distribution Narrow size
Electromagnetic Separation of Copper Iron Sulphides
Table of ContentsCupriferous PyritesResults of a Test on a Chalcopyrite-Garnet OreElectromagnetic Separation of Copper CarbonatesElectromagnetic Separation of GarnetElectromagnetic Separation of PyrrhotiteElectromagnetic Separation of LimoniteCalcining Limonite for MagnetismPlants Employing the Ferraris Cross-Belt SeparatorsSeparation of HematiteSeparation of the Oxides of ManganeseSeparation of Monazite SandsSeparation of Leucite from LavaCorundum Electromagnetic Separation Hornblende Electromagnetic Separation Electromagnetic Separation of ChromiteElectromagnetic Separation of DiamondsElectromagnetic Separation of Galena Chalcopyrite, sp. gr.
Electromagnetic Separation Siderite & Blende
Table of ContentsCalcining Siderite to the Magnetic OxideSeparation of Raw SideriteSeparation of Calcined Siderite from Blende The specific gravities of blende (3.9 to 4.2) and siderite (3.7 to 3.9) are almost identical, and they may not be separated by any method based on this property. The most important application of magnetic separation in Europe has been the separation of siderite,
Separating Pyrite & Blende Magnetism
Table of ContentsSeparation of Roasted Pyrite and Marcasite from Nonmagnetic BlendeSeparation of Magnetic Blende from PyriteSeparation of Magnetic Blende from Pyrite The co-occurrence of the sulphides of zinc and iron is frequent; blende and pyrite, or marcasite, are found together in important ore bodies which are worked for the value of the contained zinc, and many lead deposits in their
ASSAYING CYANOGEN BY MERCURIC CHLORIDE
Apparatus, Reagents.—Apparatus as before. For the standard solution, pure HgCl2 is required. For analysis the student may take further portions of the materials used in the last estimation. Method, Reactions.—If to an ammoniaeal solution of KCN a solution of HgCl2, be slowly added, Hg(CN)2, is formed and is soluble in water. When this reaction is complete any further addition of
ASSAYING CYANOGEN BY SILVER NITRATE
Apparatus, Reagents, etc.—The same as in the last analysis, except that the chromate is not required. For analysis the student may take a solution prepared by the demonstrator, or a sample of ‘ gold ’ cyanide (KCN), which, if the potassium salt, will contain from 95% to 98% KCN. This salt now frequently contains NaCN, so that if estimating in
ASSAYING LEAD BY AMMONIUM MOLYBDATE Alexander’s Method
Apparatus, Reagents.—The usual apparatus. For the standard solution, ammonium molybdate is required [(NH4)2MoO4], or by a simple calculation the heptamolybdate (NH4)6Mo7O24,4H2O which is non-deliquescent, or the trioxide MoO3 dissolved in NH4HO may be used. For an indicator a solution of 1 gm. tannin in 500 c.cs. water is used. For analysis the student may take a siliceous galena ore, containing
ASSAYING ZINC BY POTASSIUM FERROCYANIDE Fahlberg’s Method
Apparatus, Reagents.—The usual apparatus. For the preparation of the standard solution pure K4FeC6N6 (free from K6Fe2C12N12) is used, and pure ZnO is employed for checking the standard. As an indicator a solution of uranium acetate is employed. In the preparation of the ore for analysis the following solutions are required :—About 100 c.cs. of a solution of KClO3 crystals in strong HNO3, prepared by shaking
Assaying Manganese
VOLUMETRIC ESTIMATION OF MANGANESE BY POTASSIUM PERMANGANATE. (Volhard’s Method) Aparatus. Reagents.—The usual apparatus. For the standard solution K2Mn2O8 is required. Zinc oxide free from Mn is used for neutralisation. For analysis the student may take a ferro-manganese ore (containing Fe and Mn). Method, Reactions.—If a dilute, neutral or faintly acid solution of a manganese salt be heated to boiling, and
Assaying Arsenic
VOLUMETRIC ESTIMATION OF ARSENIC (Pearce’s Method) Apparatus, Reagents —The usual apparatus. For precipitation E. AgNO3 may be used. For the standard solution NH4CNS is used, and as an indicator a saturated solution of iron alum. For the solution of the silver arseniate, pure HNO3 is required. Method, Reactions.—The ore containing the arsenic is fused with a mixture of KNO3 and Na2CO3,
ESTIMATION OF IRON BY STANDARD SOLUTION OF POTASSIUM PERMANGANATE
THE ESTIMATION OF IRON BY STANDARD SOLUTION OF POTASSIUM PERMANGANATE (Marguerite’s Method). Apparatus, Reagents.—The usual volumetric apparatus, For standardising the solution soft iron wire such as is used for binding flowers is best suited. This wire contains 99.6% of iron. Pure K2Mn2O8 is required for the standard solution. If in doubt concerning its purity it may be purified by crystallising
ESTIMATION OF IRON BY STANDARD POTASSIUM BICHROMATE SOLUTION
THE ESTIMATION OF IRON BY STANDARD POTASSIUM BICHROMATE SOLUTION (Penny’s Method). Apparatus, Reagents.—For the preparation of the standard solution pure K2Cr2O7 is required, also the iron wire as before, E. SnCl2, 2/5 E. HCl and E. K6Fe2C12N12, freshly prepared and containing no ferrocyanide. A white porcelain plate is used for the indicator tests. For analysis the student may take another sample of
DETERMINATION OF CHLORINE IN BLEACHING POWDER BY IODINE AND STANDARD HYPOSULPHITE
THE DETERMINATION OF CHLORINE IN BLEACHING POWDER BY IODINE AND STANDARD HYPOSULPHITE. Apparatus, Reagents, etc.—As before. The student may take for analysis a sample of ordinary commercial bleaching powder. Method Reactions.—If, to the milky liquid obtained by treating the powder with water, excess of KI be added, and then HC2H3O2 the chlorine is liberated from the bleaching powder, which consists
Estimation of Copper in Ores by Iodide Method
The estimation of Copper in Ores by the Iodide method.—The standard solution is again used, and needs no further checking. The student may take for analysis a sample of copper pyrites, portion of which he may reserve (after reduction and sampling) for subsequent estimation by the Cyanide method. The Analysis.—Powder the sample to pass an 80 sieve, and from this
Hydrochloric Acid Solution Strength Determination
Apparatus and Reagents.—The usual volumetric and gravimetric apparatus. The student may take for analysis a sample of the ordinary bench reagent 5E. HCl. He will also require about 10 gms. pure NaHCO3, and should test this substance for Cl and SO3. If these are found, place a small plug of cotton-wool in the neck of a funnel, and on it