the recovery of valuable minerals in the concentrator was less than expected, and the metal prices were depressed by the great depression of the 1930s. the poor recoveries were found to be caused by the unusually for the time fine nature of the mineral grains in the mount isa ore.
watch batteries strictly speaking cells, as a battery is composed of multiple cells are specially designed for their purpose. they are very small and provide tiny amounts of power continuously for very long periods several years or more . in most cases, replacing the battery requires a trip to a watch-repair shop or watch dealer; this is .
beryllium is a p-type dopant in iii-v compound semiconductors. it is widely used in materials such as gaas, algaas, ingaas and inalas grown by molecular beam epitaxy mbe . cross-rolled beryllium sheet is an excellent structural support for printed circuit boards in surface-mount technology.
renewable energy sources are even larger than the traditional fossil fuels and in theory can easily supply the world's energy needs. 89 pw of solar power falls on the planet's surface. while it is not possible to capture all, or even most, of this energy, capturing less than 0.02% would be enough to meet the current energy needs.
froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. this is used in mineral processing, paper recycling and waste-water treatment industries. historically this was first used in the mining industry, where it was one of the great enabling technologies of the 20th century. it has been described as 'the single most important operation used for the recovery and upgrading of sulfide ores'. the development of froth flotation has improved the recovery of valu
antimony is a silvery, lustrous gray metalloid with a mohs scale hardness of 3, which is too soft to make hard objects; coins of antimony were issued in china's guizhou province in 1931 but the durability was poor and the minting was soon discontinued. antimony is resistant to attack by acids.