While traditional extraction methods had persisted there were vital changes in the ways in which ore was prepared for smelting and in the smelting process itself.
42.
The aluminum companies in the group are focusing not only on energy savings, but also on eliminating another powerful greenhouse gas, perfluorocarbons, by changing the smelting process.
43.
Zamak avoided this by the use of 99.99 % pure zinc metal, produced by New Jersey Zinc's use of a refluxer as part of the smelting process.
44.
The smelting process also required limestone, conveyed at first by horse and cart from the Cumbernauld area; and refractory bricks for lining the kilns and withstanding high temperatures.
45.
The aluminum industry is testing new smelting processes that could, if widely adopted, greatly cut releases of both carbon dioxide and perfluorocarbons, another group of potent warming gases.
46.
My chemistry is weak-so batteries and maybe some of the details of the smelting process would require some experimentation-but knowing the underlying principles should make experimentation go fairly quickly.
47.
Adding silica also reduces the melting point ( or, more properly, the liquidus temperature ) of the slag, meaning that the smelting process can be operated at a lower temperature.
48.
The leachable fluorides in SPL come from the cryolite ( Na 3 AlF 6 ) and sodium fluoride ( NaF ) that are used as a flux in the smelting process.
49.
In the smelting process of using huge bellows driven by waterwheels, massive amounts of charcoal were used in the production process, leading to a wide range of deforestation in northern China.
50.
The collection of the Museum also comprises ancient and modern miners tools, together with lead turtles produced for commercialization their moulds and other products derived from the smelting process.
