Stone Crushers
Methods of Crushing Stone without a Crusher Up to the date of the invention of the Stone Crusher, stone for road-metal was broken by hand, with the aid of a hammer having a long, pliant handle, and a round, ball-like head, illustrative drawings of which may still be found in standard dictionaries of engineering. Crushing […]
Precipitate Gold Mercury with Electricity
The treatment of slimes has of late years been, the chief difficulty in connection with cyanide work, in which much time and money has been spent in endeavouring to find a practical solution of this problem. The processes at present in use are: Filter pressing, as practised in Western Australia. Decantation, as practised in South […]
SX Solvent Extraction Equipment – Process Function
Mixer Settler The Mixer-Settlers are of the pump-mixer type in which the Mixer Impellers, in addition to mixing the process liquors, also provide the pumping head necessary to transfer them between stages. The variable speed Impellers can be used either with, or without, spoiler blades, the design of which is such that when fitted the […]
How to Calculate the Size of a Mine Hoisting System
It is often necessary to calculate the size of a mine hoisting system required to raise a given quantity of material, either as a preliminary to the detail design of the machinery, or to decide whether machinery on hand or offered by a manufacturer is adapted to the work to be done. The first element […]
Effect of Tellurium on Brass
The presence of small amounts of tellurium in certain kinds of copper, and its exceptionally deleterious influence in producing red-shortness of this metal, led the author to conduct a few experiments on the influence of tellurium on the properties of brass. While these experiments were not intended to be exhaustive, they demonstrate that, as far […]
Volatile Hydrocarbons
Petroleum The occurrence of petroleum in the Redington quicksilver-mine, New Idria, California, is reported by Luther Wagoner. He says: ‘‘ Mineral-oil occurs in considerable quantity, a barrel of forty gallons being collected in one drift. It was used for lubrication of the machinery.” Prof. Egleston, writing of the quicksilver-mines in northern California, says: “ […]
Deposition of Ores in Limestone
A study should be made of the structure of the ore-bearing limestones, with the special object of determining the causes that have made certain strata favorable for ore, while other beds in the same geological formation, having an almost identical chemical composition, and so situated that they are traversed by the same fissures, through which […]
Relative Reducing Power of Minerals
Calculation of the Theoretic Reducing Powers of Various Organic and Inorganic Mineral Substances usually Occurring in Association with Ore-Deposits, Based upon the Weight of Oxygen Consumed. The quantitative value, or amount of work accomplished in the formation of ore-deposits by the various reducing substances, is measured by the weight of oxygen with which they unite. […]
Reducing Action of Carbon and Hydrocarbons
Carbon has long been recognized as one of the most powerful reducing agents in the deposition of ores. Investigations, made by myself, of the zinc- and lead-deposits in Southwest Missouri, in the region centering about Joplin, where the formation of the metallic sulphides has been due to the action of bitumen, carbonaceous shales and bituminous […]
Oxygenation of Petroleum
Experiments made by the author on the oxidation of petroleum show that the heavy hydrocarbon oils unite very slowly with oxygen, when first exposed to its action, even at temperatures as high as 150° C.; but after the action is once started, by the combination of even a little oxygen with the hydrocarbon, the further […]