The roasting of zinc ores in the manufacture of sulphuric acid by the contact process

The unprecedented demand for sulphuric acid of the higher strengths (98% and higher) in the manufacture of explosives, has stimulated the zinc smelters to increased efforts in the recovery of their Roaster gases in the form of Sulphuric Acid. The Lead-chamber process is unsuitable, however, in making strong acid and the smelters naturally turned to the contact mass or catalytic processes. In the roasting of zinc ores practically all of the sulphur is removed as sulphur dioxide, the disagreeable odor and unmistakable injury to surrounding localities, of which, first led to the adoption of sulphuric acid plants by most zinc smelters. This sulphur dioxide so formed has little value unless converted into sulphuric acid...In the contact process the dry, cleaned Sulphur dioxide is passed through a mass containing a substance which acts as a catalyzer converting the sulphur dioxide to sulphur trioxide --Introduction, page 1

Led by the Holy Spirit : the missionary career, leadership, thought, and influence of Alice Eveline Luce

https://place.asburyseminary.edu/ecommonsatsdissertations/1707/thumbnail.jp

The Value of Salt Marsh Edge vs Interior as a Habitat for Fish and Decapod Crustaceans in a Louisiana Tidal Marsh

Flume nets of various lengths and a 3-m seine were used to sample the fishes and macrocrustaceans using a flooded Louisiana salt marsh and the adjacent tidal creek. The experiment allowed for species-specific comparisons of the flooded marsh at the creek edge versus the interior. Of the 37,667 organisms collected in flume nets from January through November 1989, 89% were decapods (nine species) and 11% were fish (29 species). An additional 18,539 organisms (75% decapods and 25% fish) were collected from concurrent seine samples taken from July through November. Comparison of catches among different flume lengths and low tide versus high tide seine collections revealed distinct patterns of marsh habitat utilization. Densities of most organisms were highest within 3 m of the water’s edge, but significant numbers of marsh-resident fish species used the interior marshes. The edge marshes appeared to be used by both transient and resident species; however, the interior marshes were used primarily by marsh-resident species (Cyprinodontiformes and Palaemonetes sp.) that are excellent food sources for adult transient-species. Four zonations of marsh use are described for transients, residents, and rare species

Oils and flotation

We know that the sulphides, or minerals with a metallic lustre, can be floated either with or without oil and that the carbonates, silicates, etc., cannot be floated so readily. Why do certain oils have the power of selecting certain minerals? Why do certain oils produce froth? Why do certain oils give a watery froth? Why do some give an ephemeral froth and others a tough one? Of the thousands of oils known, only a few classes have found successful application in this new process...This leads us to the question, what property or combination of properties make oils valuable as flotation agents?--Introduction, page 5-6

Barbituric Acids. V. 5-substituted-mercapto Derivatives of 5-isoamylbarbituric Acid

Since no mention has been found in the literature of any 5-substituted mercapto-5-alkyl derivatives of barbituric acid, it was thought to be of interest to prepare a series of compounds containing sulfur attached directly to the barbituric acid nucleus. 5-substituted mercapto-5-isoamylbarbituric acids were chosen as representative of barbituric acids in which the alkyl group has a fairly high molecular weight

Koinonia

The University as a Place of Spiritual Formation, Eugene Peterson and Steve Moore President\u27s Corner Into the Future: Highlights of the 1994 ACSD National Conference CoCCA: Community Service Finds Its Way into the Freshmen Orientation Program Thanks for the Memories & Much Morehttps://pillars.taylor.edu/acsd_koinonia/1034/thumbnail.jp

Theology, News and Notes - Vol. 40, No. 03

Theology News & Notes was a theological journal published by Fuller Theological Seminary from 1954 through 2014.https://digitalcommons.fuller.edu/tnn/1117/thumbnail.jp