The case for AL versus HPAL has been debated for many years and gives rise to a substantial list of relative strengths and weaknesses as summarised in Table 1. Reid and Barnett (2002) concluded that for AL to be competitive with HPAL, it would have to "give good recoveries, allow acceptable acid consumption and produce low residual iron in solution".
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So you can always have it ready to hand, the Illustrated Professional Dictionary of Horology is also available in a paper version. Containing around 1300 pages, it lists nearly 5000 terms in four languages (French, German, English and Spanish), with an alphabetical index.
INSTRUCTIONS: Work in groups of three. Choose one mining industry in South Africa and find information about the industry of your choice. Choose from the following list: gold, iron, coal, phosphate, manganese, diamond, chromium, copper and the platinum group metals (PGMs).
The Romance of Steel A History of the Steel Industry by Herbert Newton Casson THE BIRTH OF THE BESSEMER PROCESS. On that bleak November day when Andrew Carnegie was born in a Scottish cottage, the iron and steel makers of America had no more thought of millions than of castles in Spain.