Tin appears to have been formerly smelted by the Jews, who in the reign of King John monopolized the tin trade, by merely hollowing out a plot of ground, and fusing the oxide with wood, in an open fire.
The Mint returns showed a very large proportion of impurity, even in the smelted gold.
The result is a spongy cake of gold, which is either sold as "retorted" gold or smelted into bars.
Smelted with borax, the iron oxide readily separated with the slag; result, 311 gr.
The gold smeltedon the mine was nearly as bad proportionately.
The precipitates are then collected, and after calcination in a special furnace for the purpose of oxidising the zinc, are smelted in the usual manner.
The charcoal, with its adhering chlorides, was conveyed to the smelting-house and the gold smelted into bars of extremely pure metal.
All the lead smelted at these mines is transported in carts and wagons to the banks of the Mississippi, and deposited for shipment at Herculaneum or St. Genevieve.
The quantity of lead annually smelted from the crude ore, I have estimated at three millions of pounds; and the number of hands to whom it furnishes employment, at eleven hundred.
Perhaps nearly or quite half of the whole quantity of lead yearly smelted at the Missouri mines, is shipped from this place.
It has been tried in a slag furnace, and smelted easily, without a flux.
Nearly all the lead smelted at the Missouri mines is transported in carts and wagons from the interior to St. Genevieve and Herculaneum.
The quantity of lead annually smelted from the crude ore, I have estimated at three million pounds; and the number of hands to whom it furnishes employment, at eleven hundred.
The number of mines now wrought is about fifty, and the quantity of lead annually smelted is estimated at three millions of pounds.
And you say," asked Wyzinski, "that you often find worked and smelted gold here?
The Arabs still search there for the smelted lumps of gold, buried or lost by those of whose existence no other trace remains.
And little boys and girls from Barrow, joyous mites of humanity not yet smelted into the industrial mass, tried leaping-matches from the stumps of mossy pillars and ran races through nave and cloister.
In reverberatory furnaces it is smelted by fuel in a fireplace, separate from the ore, and in cupolas the fuel, generally coke, is in direct contact with the ore.
Austin, of Denver, Colorado, and both at Leadville and Silverton raw ores are successfully smelted with as low a fuel consumption as 3 of coke to 100 of charge.
It is smelted raw with hot blast in cupola furnaces, the largest being 210 in.
After the ore has been partially calcined, it is smelted to extract its earthy matter and to concentrate the copper with part of its iron and sulphur into a matte.
Native copper, sometimes termed by miners malleable or virgin copper, occurs as a mineral having all the properties of the smelted metal.
When Swansea was the centre of the copper-smelting industry in Europe, many varieties of ores from different mines were smelted in the same furnaces, and the Welsh reverberatory furnaces were used.
If it contains more than 55% of copper it is directly refined, while if it contains a lower percentage it is smelted with matte or calcined copper pyrites.
In Colorado the pyritic ores containing gold and silver in association with copper are smelted in reverberatory furnaces for regulus, which, when desilverized by Ziervogel's method, leaves a residue containing 20 or 30 oz.
He never saw the Indians smelt the copper, but they informed him that the earth was washed from the ore by showers, and that they smelted it on a fire until it ran, and then beat it, it being very malleable.
Copper ore is dug from several mines in California, but it is all exported to be smelted elsewhere.
Silver ore after pulverization is smelted by mixing with it fifty per cent.
Virginia would yield better and cheaper timber for shipping than Prussia or Poland, she would furnish potash in abundance, and since wood could there be had for the cutting, her copper and iron ore could be smelted on the spot.
The ore is then transferred to the fusing furnace, and smelted in contact with fuel.
Iron was smeltedin the furnace, and a few tools were forged--the first iron objects made in the New World by the English.
At the writing of the above, some few persons had found their way to the mines, raised small quantities of ore, and smelted it; but their operations were contracted for want of tools and the proper appliances for smelting.
The ore, smelted with coke, is said to produce the best iron in market, and commands a ready sale at excellent prices.
They confined themselves to such ore as was on or near the surface, and made small oven furnaces, and smelted with charcoal.
England, the second largest European consumer, before the war had insufficient smelting capacity within the British Empire and was partly dependent on foreign-smelted lead.
A large portion of the Bolivian concentrates formerly went to Germany for smelting, but during the war American smelters were developed to handle part of this material; large quantities are also smelted in England.
Tin is easily reduced from its ores and most of the tin is smelted close to the sources of production.
This production was in minor part smelted locally,--the larger part moving down the Rhine to the vicinity of the Ruhr coal fields, and Ruhr coal coming back for the smelting in Lorraine.
Before the war, antimony was smelted chiefly in China, England, and France, and to a lesser extent in Germany.
It is estimated that roughly two-thirds of the annual world production is used or smelted within the countries of origin, the remaining one-third being exported.
Mexico sends large quantities of bullion and ore to the United States to be smelted and refined in bond.
Small amounts of zinc concentrates are brought in from Mexico and Canada to be smelted in bond.
Because of the ease with which they can be mined and smelted on a small scale they have been used since early times, but have furnished only a very small fraction of the world's iron.
The Russian ores have largely been smelted in that country.
The facts brought forward to support this view are: that no iron was smelted in Europe before 900 B.
The result is a spongy cake of gold, which is either sold as “retorted” gold or smelted into bars.
They rented the woods of Glenkinglass, and made charcoal, with which they smelted imported iron ore.
The first question that most people ask, when they hear of the ironworks in the parish of Gairloch, is,--Where did the iron that was smelted come from?
The alloy, having been previously mixed, has been smeltedin a furnace, and a workman is pouring it into a sand-mould.
Ay, sir; but I had his orders to ship forty chests of lead and smeltedcopper on board the Shannon.
Both these ships lay in Sydney harbor, and had taken in the bulk of their cargoes; but the supplement was the cream; for Wardlaw in person had warehoused eighteen cases of gold dust and ingots, and fifty of lead and smelted copper.
But we raised and smelted no copper, importing it unwrought.
Much of it was mixed with silver, and was obtained in the course of the operations by means of which silver was smelted and refined.
The brief account which Strabo gives of the mines of Tamasus shows that the ore was smelted in furnaces which were heated by wood fires.
