For practice the student may take either “ Stourbridge ” or “ Dinas ” fireclay and sand. The following table gives their average composition. The
Table of ContentsElimination of ImpuritiesMagnetic SandsBriquettingSeparation of Magnetite as an Impurity Magnetite is the most strongly magnetic of all minerals, and it is therefore natural
Table of ContentsWetherill Rowand Separator Type “E” SeparatorHomboldt-Wetherill Cross-Belt SeparatorMechernich SeparatorMotor-Type SeparatorPrimosigh Separator For Dry OresUlrich SeparatorPayne Magnetic SeparatorInternational SeparatorUbaldi SeparatorHumboldt-Wetherill Type VI SeparatorWetherill Parallel
Table of ContentsBall-Norton Belt SeparatorMonarch or Ball-Norton Double-Drum SeparatorDellvik-Grondal SeparatorGrondal Type II SeparatorGrondal Type III SeparatorGrondal Type IV SeparatorGrondal Type V SeparatorThe Grondal Slime SeparatorWetherill
The action of permanganate of potash upon a ferrous solution is one of oxidation, hence it is evident that if any other oxidising agent is
Table of ContentsStandard SolutionsStandardising Within the limits of the error of experiment, a definite volume of a solution or gas represents a certain weight of
Gasometric methods are not much used by assayers, and, therefore, those students who wish to study them more fully than the limits of this work
The chief oxidising agents (which are also de-sulphurisers) are the following: Nitre, or Potassic Nitrate.—This salt fuses very easily to a watery liquid. It oxidises
The de-oxidising agents most in use are the following: Charcoal.—Powdered wood charcoal; it contains more or less hygroscopic moisture and about 3 or 4 per
Occurs in nature alloyed with osmium as osmiridium or iridosmine, which is “ rather abundant in the auriferous beach sands of Northern California” (Dana). It