Tests of miners' flame safety lamps in gaseous, coal-dust laden atmospheres
✍ Scribed by L.C. Ilsley
- Book ID
- 104123580
- Publisher
- Elsevier Science
- Year
- 1921
- Tongue
- English
- Weight
- 57 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
other reagents used, for the year I9I 9 . Some delay was experienced in collecting the data, but eventually returns were obtained from practically all the important plants.
The results have been recently published in tabular form by the bureau. The amount of ores of all kinds treated by flotation was 26,545,564 tons, from which 3,1o5,343 tons of concentrates were obtained, showing a concentration ratio of 8.55 tons into one. The total of all reagents used was 113,5io,234 pounds, equivalent to 4.2384 pounds per ton of ore treated. The bulk of the ores treated was copper ore, the rest being lead and lead-silver ores, zinc ore, gold-silver ore, graphite ore, and miscellaneous ores, such as molybdenum and antimony, and complex mixed ores of various kinds.
The most generally used flotative agents for copper ores are sulphuric acid, kerosene acid sludge, and coal tars. For lead and silver ores, hardwood creosote is used most, followed by coal tar, crude petroleum, and pine oils. For zinc ores, pine oil is the most important, with copper sulphate second, and creosote third.
Miscellaneous agents used are sulphur, specially prepared fractions of coal creosote, wood creosote, and pine oil, also various sodium salts, ammonia, ammonium salts, etc.