Shaft Mucking Machines
Hand mucking in shaft sinking operations is no longer necessary because several efficient methods and machines have been devised for this purpose for use in both vertical and inclined shafts. For years shaft sinking was considered the hardest and most dangerous job in mining and, consequently, the turnover in shaft crew was high. High turnover […]
Loading railroad car, truck, or barge
The primary purpose of the loading plant is to transfer the finished product from the preparation machines to the railroad car, truck, or barge in which it is to go to market. Secondary purposes of the loading plant are: to prevent excessive degradation of sizes during loading, to reduce segregation as much as possible, and […]
Method of Preparing Closely Sized Micron and Submicron Fractions
Study of light adsorption, reaction rates, electrophoresis, particle packing, and corrosion is hindered by lack of a suitable method of preparing small amounts of closely sized materials in the micron and submicron range. Most fractionation methods depend on some form of particle movement through a viscous media in which velocity of a particle, relative to […]
Interstitial Water Determination
A knowledge of the magnitude of the irreducible interstitial water in a porous medium is so important to petroleum engineering that its determination has become routine in core analyses. In all geological formations there exists, in the pore spaces of the rock structure, water that is held in a state of equilibrium between capillary and […]
Electrolytic Copper Refinery of Slimes
The recent increase in anode copper production at the Noranda smelter placed an additional load on the Montreal East plant of Canadian Copper Refiners Limited. The consequent increase in the amount of anode slimes led to a careful consideration of the various methods of slimes treatment. Characteristics of the Slimes Anode slimes are made up […]
Laboratory Studies on Iron Ore Sintering and Testing
Some of the variables encountered in the sintering of iron ores and their effect on sinter properties have been investigated at the Jones and Laughlin Ore Research Laboratory in Michigan. Ores requiring agglomeration before blast furnace utilization may be classed as coarse, intermediate or fine. Coarse iron ore is considered similar to a —¼-in. Mesabi […]
Effect of Mill Speeds on Grinding Costs
In my opinion, the effect of mill speeds on grinding costs must be studied along with capital investment and dollars gathered together as profits. Comparing the entire groups of operators with those who have had the opportunity to make slow-speed mill studies, I think you will find the latter small in numbers. Most managers want […]
Rock Hardness & Drilling
A survey of the technical literature concerned with oil well drilling methods and particularly with rate of penetration by various cutting media on different types of rock provides a mass of conflicting data. This is especially true with respect to, (1) the relative efficiency of diamond, rotary and percussion drilling operations; (2) the costs of […]
Tramp Iron Detector for Conveyor Belts
The problem of tramp iron removal from moving ore belts is a long standing one. When heavy ore streams are carried on a belt, magnetic pulleys and strong surface magnets fail to remove tramp buried in the ore stream. Tramp iron buried in the ore stream cannot be pulled from the bed by surface magnets […]
How to Recover Flake Mica
A new method for concentrating the flake mica either from present washing plant tailings or from new feed has been developed. In this paper, flake mica refers to that which occurs in weathered granites, alaskites, pegmatites, and schists in a form too fine to be considered sheet mica. It ranges in size from 1 in. […]