Processing Bastnasite Ore

Average composition of ore from the San Bernardino deposit is less than 0.1 pct ThO2, 25 to 35 pct calcite, 10 pct rare earth oxides, 15 to 20 pct silica, and 30 to 40 pct barite. Rare earth content of the ore analyzes 50.7 pct CeO, 4.2 pct Pr6O11 11.7 pct Nd2O3, 1.3 pct Sm2O3, … Read more

Magnetic Roasting of Marginal Iron Ores

An experimental procedure was developed for studying magnetic roasting on a accurately-controlled laboratory scale. The loss-in-weight method was used and the course of reduction could be followed under a reducing gas atmosphere containing as many as five different components. Some important variables of the operation were checked on a marginal Mesabi iron ore containing porous … Read more

Magnetic Recovery of Germanium Sulphide

The Kipushi deposit, where the Prince Leopold Mine has been installed belongs to Union Miniere du Haut-Katanga and is located in the Belgian Congo, 20 miles SW of Elisabethville, at the vicinity of the Northern Rodhesian Border. How does germanium occur Differentiation of renierite from regular bornite on a freshly cleaved surface is uneasy, but … Read more

Effect of Pulp Depth and Initial Pulp Density in Batch Thickening

The two principal attributes of a thickener pulp are its settling rate and the ultimate pulp density of the thickened mud. Testing for evaluation of thickening attributes of a pulp has usually been done batch-wise by placing the pulp in a one-liter glass graduated cylinder and noting the position of the boundary between clear liquor … Read more

Deep Well Turbine Pumps

Deep Well turbine pumps receive constantly increasing application to the problem of mining water and other fluids from great depths. Many installations of medium settings are presently operating successfully and it is felt that much greater depths are immediately within reach. Settings and lifts in excess of 2000 feet are not at all out of … Read more

Copper Segregation Process

The recovery of copper from low-grade oxidized and mixed oxide-sulfide copper ores by acid leaching is standard practice in the Southwest. Some ores, however, are unamenable to this method of treatment owing to excessive acid consumption by calcite or other acid-consuming gangue minerals. Other ores present a handling problem because of the presence of clay … Read more

Heavy Rare Earths Separation by Ion Exchange

The equipment for the separation of the rare earths consists of nearly 200 columns thirty inches in diameter by twenty feet high. They are constructed of materials which will not contaminate the rare earth products. Most of the cation exchange resin in the plant is a styrene-divinylbenzene sulfonic acid resin such as Amberlite IR-120 and … Read more

Percussion Drilling

The past 15 years have seen rapid advances in the metallurgy of materials for drill machinery and bits, but rock drilling itself continues to be largely an art. Jet piercing, roller bit rotary drilling, and rotary percussion are all promising new techniques, but the percussion rock drill, still used for 90 pct of the blastholes … Read more