Marked Ball Wear Test
Marked ball wear testing described in a 1948 paper by Norman is an invaluable test method to measure relative and/or absolute wear rates of balls under identical mill operating conditions. Preparation of balls at Armco consists of drilling a 6.4 mm diameter hole in each ball with an electrical discharge machine (EDM), cleaning, weighing, placing […]
Flameless AAS Atomic Absorption Spectroscopy
Flameless AAS provides a means to increase flame AAS sensitivity, by up to 200 times. Interferences from aqueous leachates and digestates are so great, however, that flameless AAS has found application mainly after organic extraction. Thereby, the analytical sensitivity is increased far beyond that of the SX/flame- AAS methods. Interferences Interferences from other elements have […]
DSM Wood Chip Removal Screen
One of the minor but occasionally troublesome problems in the Creede plant is related to the clayey nature of some of the ore from the mine. At times the thickener underflow is so clayey that it forms a rope which can almost be carried around without a bucket. As described in the previous report: ” […]
Zinc Hydrometallurgy Solvent Extraction
Part of Zinc Hydrometallurgy and Zinc Solvent Extraction includes the zinc and iron sulphate solution from the hot acid leach will typically contain 80-100 g/l Zn, 20-30 g/l Fe, mostly in the ferric state, and 40-60 g/l free sulphuric acid. The sulphuric acid concentrations will depend upon the leaching techniques used, and the composition of […]
Alunite Crystal Chemistry
Alunite has been described both by the chemical formula [KAl3(SO4)2(OH)6] and by the chemical formula [K2SO4·Al2(SO4)3·2Al2O3·6H2O]. The latter gives an erroneous impression that water is structurally associated with the mineral. The former representation is therefore, to be preferred. It is more in conformity with the crystal structure of alunite. The structure of alunite is similar […]
How to Size a Ball Mill or Rod Mill and Size its Motor
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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 […]
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 […]