Bulletin of the National Research Centre

Table 1 Independent variables and levels

From: Effects of alkali solution on the dissolution kinetics and optimization processes of iron from Akwuke ore

Name	Unit	− 1 level	+ 1 level	− alpha	+ alpha
Particle size	μm	− 45	600	− 69.94	714.94
Agitation rate	rpm	− 90	490	− 7.15	572.84

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