Search Documents

By L. Delatour, K. Voltaire

This paper presents various aspects of the legal and economic settings that govern the exploration for mineral resources in Haiti.

Jan 3, 1979

By Edward I. Salkovitz

RECENTLY a set of crystallographic angles for bismuth was calculated and a standard (111) projection was constructed. Since these calculations

Jan 1, 1957

By Harold E. Rowen

Sintering is accomplished at a temperature of more than 2000°F. For the purpose of this discussion it will be defined as the art of burning a solid fuel with 90 to 95 pct ash content. Think of the problems of combustion involved in keeping a home furnace burning properly with 12 to 20 pct ash in the fuel and remember that the amount of fuel involved in the 5 to 10 pct combustion loss represented by the definition has to be just about right or nothing is going to happen. Our forefathers discovered that many ores containing metals csscntial to the steadily rising standards of living were associated with other minerals, sulfur and arsenic, for example, which had to be removed before ultimate refining. They did this by utilizing the solid fuels they had available-the sulfur or other readily combustible components- to create roasting heat.

Apr 1, 1956

By Sidney W. Poole

THE control of deoxidation, together with other factors involved in electric-furnace melting practice, to consistently produce heats of high-quality alloy steel to stringent specifications as to nonmetallic inclusion content is a problem of considerable magnitude. Steel melting as an industrial process is subject to many variables that can influence the quality of the product made. In order to modify the size, amount and distribution of inclusions and to promote their elimination, deoxidation, among other practices, plays a major part. The primary purpose of deoxidation in the production of electric-furnace alloy steels is the removal of dissolved oxygen present as FeO in the bath, which is produced as a result of prior oxidizing conditions. The elements usually added to effect this removal of soluble oxygen are those that will, upon addition, cause the formation of an oxide compound insoluble in the molten steel bath as silica, alumina or silicate combinations.

Jan 1, 1947

Constraints in the location, process selection, and operation of the modern zinc refinery brought about by the heightened environmental awareness of the public were explained by Sanjoy Shome, project engineer for Kaiser Engineers Inc.

Jan 11, 1977

By Malcolm D. Flavel

This article synopsizes the major conclusions of Allis-Chalmers research into crushing and screening plant design. The full text of the research findings, together with the supporting mathematical details, is expected to be made available to the industry within the next several months.

Jan 7, 1977

By William C. Waldbieser

Webster's Third New International Dictionary defines new in part as "having been seen or known but for a short time although perhaps existing before." It has recently become fashionable to talk about the new life for old "King Coal," and how we will have to double or even triple our coal production by 1985, or how the US will become energy-independent by 1980. Since coal represents over 80% of our proven energy reserve, the nation will turn to coal as a savior in our time of energy crisis, so goes the argument.

Jan 10, 1974

Jan 1, 1923

Jan 1, 1902

By Henry M. Howe

Jan 1, 1908

Jan 1, 1932

Jan 1, 1884

Jan 1, 1883

Jan 1, 1885

By E. H. Sellards

Phosphate rock like other mineral substances is found in nature in varying degrees of purity.

Jan 1, 1915

Jan 1, 1887

Jan 1, 1880

Jan 1, 1879