Towards Zero (Superintendent Battle, Book 5) by Agatha Christie

By Agatha Christie

What is the relationship between a failed suicide test, a wrongful accusation of robbery opposed to a schoolgirl, and the romantic lifetime of a recognized tennis player?

To the informal observer, it seems that not anything. but if a home occasion gathers at Gull’s element, the seashore domestic of an aged widow, prior occasions come to a dramatic head. As Superintendent conflict discovers, it's all a part of a gently laid plan—for murder.

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Extra info for Towards Zero (Superintendent Battle, Book 5)

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With a proper control of these parameters a sequential selective flotation has been found possible for a large number of ores, comprising solidified mixtures of sulfides liberated at relatively coarse sizes from nonsulfide gangue minerals. e[ IAI 95 . . . . . . . . ·. . ·. ·.... ' ...... / .... ' ... -:~ ....... 7. Threshold concentration of collector. , CA, Cc , and CB , for a 95% recovery. Such differentiation is the basis for selective separations by flotation. However, in practice the selectivity is achieved not so much through different concentrations of collector alone but through a combined effect of activating and depressing agents together with the collector species.

Sutulov (1974) gives detailed accounts of the world's porphyry deposits, the associated processing technology, and metallurgical production data. At present, porphyry copper deposits are responsible for approximately half of the total copper production. The need to supply the market requirements from such low-grade ores resulted in a spectacular development of the open pit mining technology and, at the same time, in an equally spectacular increase in throughput of associated flotation plants. Some 50 years ago, flotation plants had 100-300 tonne/day capacities and "-' 25 years ago, 1000-3000 tonne/day capacities, whereas most of the recently constructed plants range from 20,000 to 60,000 tonnes/day, with a few which are in the 100,000-175,000 tonne/day range.

The first attempt at selective separation of galena from sphalerite was made in 1912 at the Zinc Corporation mill in Broken Hill, Australia [Diamond (1967)] and that of a selective separation of chalcopyrite from pyrite by the Granby Company at Anyox, British Columbia, Canada, in 1918 [Petersen (1967)]. The reagents employed were distillation products of coal or wood: coal tar creosote and wood tar or wood oils. t Once xanthates were introduced in 1923, the selective flotation separations of individual sulfides proved unusually successful from ores containing dolomitic gangue minerals, especially when the valuable sulfides were liberating at relatively coarse sizes.

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