Le transazioni . eccezionale esempio è stata trovata in questo worksin tlie fusione diretta del ricco liquation residuo, contenenti a mostfrom 25 al 30 per cento. Sb quando regulus aumentato vertiginosamente fino a $0,45 (brevetto statunitense n. S.) perpound nel 1915. In questo caso la carica era come segue: Liquation residuo 250 lb. (113,3 kg.) Buon carbone dolce 22 1b. (10.0 kg.) Foglio di rottame di ferro 20 lb. (9.1 kg.) solfuro di ferro (a bj^prodotto dalle precedenti commissioni).. 10 lb. (4.5 kg.) Soda 60 lb. (27.2 kg.) 14 pratica della fusione di antimonio in Cina il tempo richiesto per puzzava questa carica è circa 9.5 ore e con un pro-riduzione di 46 lb. (20.8 kg.) di

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Transactions . exceptional instance was found in this worksin tlie direct smelting of the rich liquation residue, containing at mostfrom 25 to 30 per cent. Sb, when regulus soared up to $0.45 (U. S.) perpound in 1915. In this case the charge was as follows: Liquation residue 250 lb. (113.3 kg.) Good soft coal 22 1b. (10.0 kg.) Sheet-iron scrap 20 lb. (9.1 kg.) Iron sulfide (a bj^product from the previous charges).. 10 lb. (4.5 kg.) Soda 60 lb. (27.2 kg.) 14 PRACTICE OF ANTIMONY SMELTING IN CHINA The time required to smelt this charge is about 9.5 hr., with a pro-duction of 46 lb. (20.8 kg.) of regulus. C. Treatment of Natural Oxide.—The natural oxide of antimonyis found mostly at one locality in Sin Hua District, Hunan, but smallerquantities are also found in Kwangsi Province. Its supply has beengradually decreasing so that, as a source of antimony ore, it is losing itsimportance and only a very limited quantity is now smelted by thesmall smelters at Changsha. The percentage content of antimony in. Fig. 9.—Plan of the Loong Kee smelter. the hand-sorted ore, that can be treated with profit, is from 30 to 50per cent. Its treatment in the Loong Kee Smelting Works is as follows, the charge having the following composition: Natural oxide 100 lb. (45.3 kg.) Soda 10 1b. (4.5 kg.) Charcoal 13 lb. (5.9 kg.) Of course, the amount of soda and charcoal required is increased anddecreased respectively in proportion to the decreasing antimony contentof the ore treated, and vice versa. The coal consumption is generallyhigh, being approximately 5 tons to 1 ton of regulus produced for theparticular grade of ore, with a percentage extraction of 33 per cent. CHUNG YU WANG 15 In some cases when a small amount of the sulfide is so intimatelyintercalated with the oxide ore as to render their separation by handimpossible, the following proportions for the charge are adopted: Natural oxide . .100 lb. (45.3 kg.) Soft coal 91b. (4.1kg.) Iron sulfide 5 lb. (2.3 kg.) Soda 30 lb. (13.6 kg.) D

Parole chiave associate all'immagine

• bo
• bookcentury1800
• bookdecade1870
• booksubjectmineralindustries