What is the Best Coal for Coke Making
Selection of a suitable coal or coals for the manufacture of coke of desired quality with due consideration of the purpose for which the coke is intended requires careful thought, and often it will pay to go to considerable expense in testing such coals as may be available. In general it will always be possible […]
Rare-Earth Elements Electronegativity
The rare-earth metals can be fitted into Pauling’s electronegativity scale if it is modified to take highly ionic bonds into account. Good agreement between theory and experiment is obtained only for metals of groups Ia, Ila, and IIIa of the periodic table, but here it is good enough to permit estimation of unknown heats of […]
Bucket Elevators
Bucket elevators are used for the elevation of dry or pulped ore. They consist of an endless chain or belt carrying the buckets vertically or at a steep angle. On reaching the top pulley they should turn at sufficient speed to fling their contents out with a measure of centrifugal force. The feed is directed into […]
How to Analyze Titanium Metal – Assaying
The results of investigative work on chemical, optical emission spectrochemical, and X-ray spectrographic methods were presented. Of the two chemical methods studied, the iron reduction method is superior in both time required for an analysis and in the detection limit, and the precision is quite satisfactory for the concentration and impurity range studied. The optical […]
Titanium-Vanadium Zirconium Alloys
A titanium alloy containing 10 a/o vanadium and 10 a/o zirconium has potential strength and heat treatability that merits further investigation. The titanium-10vanadium-10zirconium alloy, solution-treated at 600° C. is relatively sort, having a yield strength of 73,800 p.s.i. Aging 4 hours at 450° C. strengthens the alloy to a yield strength of 142,900 p.s.i. Ductility […]
Improve Titanium Sponge Quality
Research revealed that by systematic elimination of detrimental impurities introduced with the raw materials and by improved handling and processing techniques, high-quality ductile titanium with a hardness of less than 110 B.h.n. (Brinell hardness number) can be produced consistently. This improvement was accomplished by helium (or argon) stripping of residual atmospheric and other dissolved gases […]
Brown Iron Ore Mining
Most brown-iron deposits of southern Missouri occur in residual materials resting on Jefferson City dolomite, Roubidoux sandstone, or Gasconade dolomite, all of the Ordovician system (see table 1). The residual materials, which consist mainly of clay, chert, and iron oxides, are products of weathering of sedimentary rocks younger than the Jefferson City dolomite. Deposits of […]
Titanium Vanadium Cobalt Alloys
Results of the study of titanium binary and ternary alloys containing vanadium and cobalt show that: Vanadium additions up to 16 weight-percent were insufficient to completely retain beta on water-quenching. Cobalt additions up to 4 weight-percent do not affect retention of the beta phase on water quenching Ti-V-Co alloys containing up to 16 weight-percent vanadium. […]
How to Prepare High Purity Yttrium
This report does not constitute a finished investigation. Its purpose is to report on the status of current reduction studies and to demonstrate that high-purity ductile yttrium metal can be prepared by metallic reduction of yttrium chloride. Although both lithium and sodium have proved to be effective reductants, no conclusions can be reached on which […]
Phosphate Rock Properties
Three fundamental methods are employed in decomposing phosphate rock: Reduction by carbon at high temperature. Treatment with one or more acids. Calcination or fusion with silica, sodium salts, magnesium minerals, or small quantities of phosphoric acid. The products derived from phosphate rock by these treatment methods may be divided into the following live broad groups: […]