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Copper Moly Separation Depressant Roles

Bulk and differential laboratory flotation tests have been carried out using a synthetic mixture of chalcopyrite and molybdenum ore. In addition to boiling and roasting, six different depressants are tested so that the best conditions of separation can be identified. These reagents include sodium cyanide with and without zinc sulfate, potassium ferrocyanide, sodium hydrosulfide, arsenic … Read more

Crushed Pellets

At the Kakogawa works of Kobe Steel. Ltd., the agglomeration facilities are composed of a pelletizing plant and sintering plant. This aim is to utilize raw materials efficiently and stabilize the raw material resources. Therefore at Kakogawa works, the blast furnaces (BF) have been operated with high pellet ratio and various developments for pellet properties … Read more

How to Control Acid Mine Drainage with Surfactants

Objective Reduce or prevent acid mine drainage from coal refuse piles and surface mines by inhibiting the growth of acid- causing bacteria. Approach A dilute surfactant or detergent solution is applied directly to coal refuse piles or overburden using a hydroseeder or road watering truck. The surfactant treatment can be used either as a preventive … Read more

How to Build a Clay Heap Leach Pad – Construction

Natural materials can be used successfully in the construction of heap leach pads. The use of these materials usually result in the least expensive approach for such facilities. Sufficient geotechnical experience has been gained in the design and construction of clay heap leach pads so that they can be used with confidence. Requirements of Pad … Read more

Concrete Crib Design

This research is a part of an ongoing effort by the Bureau of Mines to improve health and safety in coal mining as directed by the Federal Mine Safety and Health Act of 1969 and amendments of 1977. The concrete crib design and field testing project has evolved from laboratory research to a verification and … Read more

Claw Hammer Scaling Tool

Proper scaling is necessary for safe operation during any underground mining activity. This need is documented in the mandatory regulations for scaling found in 30 CFR 57. In many U.S. mines operating today, scaling is accomplished by manually barring-down the loose material from around the mine opening. Barring-down requires a great deal of physical strength, … Read more

Chalcopyrite Flotation without Collector – Surface Chemistry

It has been reported that chalcopyrite can be floated selectively from an ore containing pyrite, sphalerite, and silicious gangue minerals without using a collector. Sodium sulfide was used as a promoter, presumably to clean the chalcopyrite surface of its hydrophilic oxidation products. Later it was found that the potential of the pulp, measured with a … Read more

Chelating Crosslinked Starches as Flocculation

One of the major technological problems associated with beneficiation of complex, finely disseminated ores is the generation of large quantities of fine minerals less than 10 µm in size. Fines are generally refractory to conventional low-cost beneficiation methods, and failure to recover this fraction can represent a significant, permanent loss of valuable minerals. In addition, … Read more

Carbon Adsorption of Gold

The procedures and tests descriptions are given for the ultimate gold carbon loading tests and the dynamic gold carbon loading tests. A 4.5 parts per million gold solution was prepared by dissolving fine (-200 mesh) gold powder in a sodium cyanide solution made with deionized water at pH 10.5 (lime adjusted). This gold feed solution … Read more

High Speed Vertical Screw Bulk Unloading

The Siwertell screw unloader operates at an average rate of 600 t/h with a peak capacity of over 800 t/h. The unloader consists of three screw conveyors that dig the bulk cement from the hold and deliver it to the dockside belt conveyor. The unloader will be discussed in much greater detail later in this … Read more