One of the mysteries of the English language finally explained.
- ‘Reductive calcination, or smelting, is a process of heating ores to a high temperatures in the presence of a reducing agent such as carbon, and a fluxing agent to remove the accompanying clay and sand (gangue).’
- ‘Oxidative calcination is commonly used to convert metal sulfide ores to oxides in the first step of recovering such metals as zinc, lead, and copper.’
- ‘It was assumed that metals give out phlogiston during calcination.’
- ‘Carbonized palm and carbonized hair are made by means of calcination in a sealed refractory vessel.’
- ‘The high degree of calcination of the bone ashes in both kitchens and the heat-altered hearth slabs give evidence of high temperatures, implying a good supply of oxygen.’
- ‘In the case of certain ores containing relatively inactive metals such as mercury, separation can be achieved by heating the ore in air, i.e., by oxidative calcination (also known as roasting).’
- ‘Nitrogen was determined by thermal conductivity after combustion and P, K, Ca, Mg, by a sequential spectrometer ICP after digestion by fluoridric acid and double calcinations.’
- ‘Indians were masters of calcination, distillation, sublimation and preparation of metallic salts, compounds and alloys.’
- ‘For example, the calcination of metals in sealed containers demonstrated that no change in mass occurred.’
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